Edvin Aldrian | BMKG - Academia.edu (original) (raw)

Papers by Edvin Aldrian

IOP Conference Series: Earth and Environmental Science, 2019

The criteria of season onset and withdrawal in Indonesia determined by Agency for Meteorology Cli... more The criteria of season onset and withdrawal in Indonesia determined by Agency for Meteorology Climatology and Geophysics (BMKG) which need a month to confirm the period of the wet season and dry season. The determination of season onset based on the amount of 10-day rainfall equal to or more than 50 millimeters (mm) followed by the next two 10-day rainfall (the amount of monthly rainfall equal or more than 150 mm) for the wet season and vice versa. The determination of 150 mm/month based on water requirement using the reference of evapotranspiration (ETo) in the territory of Indonesia at 5 mm per day. This paper evaluates the determination of season onset by comparing it based on the ETo value of 5 mm/day and ETo from observation data of pan evaporation in the islands of Java and Bali in the period 2003 - 2017. The result of the study shows that the difference of the dry season onset up to 3 months which 25.9 % of stations have no difference, 40.7% have 1-month difference, 22.2% hav...

Journal of Geophysical Research: Atmospheres, 2019

An extreme biomass burning event occurred in Indonesia from September through October 2015 due to... more An extreme biomass burning event occurred in Indonesia from September through October 2015 due to severe drought conditions, partially caused by a major El Niño event, thereby allowing for significant burning of peatland that had been previously drained. This event had the highest sustained aerosol optical depths (AODs) ever monitored by the global Aerosol Robotic Network (AERONET). The newly developed AERONET Version 3 algorithms retain high AOD at the longer wavelengths when associated with high Ångström exponents (AEs), which thereby allowed for measurements of AOD at 675 nm as high as approximately 7, the upper limit of Sun photometry. Measured AEs at the highest monitored AOD levels were subsequently utilized to estimate instantaneous values of AOD at 550 nm in the range of 11 to 13, well beyond the upper measurement limit. Additionally, retrievals of complex refractive indices, size distributions, and single scattering albedos (SSAs) were obtained at much higher AOD levels than possible from almucantar scans due to the ability to perform retrievals at smaller solar zenith angles with new hybrid sky radiance scans. For retrievals made at the highest AOD levels the fine-mode volume median radii were~0.25-0.30 micron, which are very large particles for biomass burning. Very high SSA values (~0.975 from 440 to 1,020 nm) are consistent with the domination by smoldering combustion of peat burning. Estimates of the percentage peat contribution to total biomass burning aerosol based on retrieved SSA and laboratory measured peat SSA were~80-85%, in excellent agreement with independent estimates.

IOP Conference Series: Earth and Environmental Science, 2019

The relative impacts of the El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) eve... more The relative impacts of the El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) events of Rice Cropping Calendar on Equatorial and Monsoon Region of Indonesia were studied. The spatial distribution of partial correlations between rainfalls with the ENSO and IOD over West Sumatera and West Java indicated a significant impact on rainfall anomalies normally along the period of September-November. The ENSO and IOD events, which is known as a monsoon type, had a wider impact in West Java, especially over northern of West Java. On the other hand, there was only a little impact of the ENSO and IOD on rainfall anomalies in the southern-west of West Sumatera. This strength was shown to be associated with the evolution of distinct weather types revealed by Pearson analysis. In these regions, the same impact of the ENSO and IOD on the width of planting area was very weak in the period of December-March whereas that in the period of June-November the impact on West Sumatera reached only 10% moreover, the impact in West Java could reach up to 80%. On the period scales, the ENSO and IOD events had significant impacts to delayed onsets of rice cropping calendar in which they were more intense than previous ones. In general, the magnitude of ENSO-delayed onsets was greater than delays to the IOD. The period-stratified ENSO variability during each of the months from September to November had a significant impact of delayed planting 2 to 4 dekads in West Sumatera and 4 to 6 dekads on West Java. This confirmed that strong ENSO events indeed affected the southern of West Sumatera and northern of West Java. Meanwhile, the period-stratified IOD variability on West Sumatera and West Java had a significant impact of delayed planting 2 to 4 dekads.

A number of crop growth simulation models have been developed using the radiation use efficiency ... more A number of crop growth simulation models have been developed using the radiation use efficiency (RUE) concept to predict crop growth and yield in various environments. These models generally calculate daily biomass production as the product of the quantity of radiation intercepted and RUE. Besides that biomass production was deterimined by water and nitrogen available factor. So, this research was carried out to quantify the RUE, biomass and leaf area index on Jatropha under rainfall condition, four levels of nitrogen fertilizer (N) and two and three population densities (P) planted twice. The experiments used a systematic Nelder fan design with 9 spokes and 4 – 5 rings were conducted at SEAMEO-BIOTROP field experiment in 2007. Data from the first experiment were used for parameterization and calibration and the second experiment data for model validation. Based on parameterization, we found that RUE can prediction above ground biomass accumulation of Jatropha were 0.94 (r=0.83) g ...

International Journal of Sciences: Basic and Applied Research, 2015

Water distribution is very crucial especially in regions vulnerable to the water availability. Th... more Water distribution is very crucial especially in regions vulnerable to the water availability. The events in the specific region of Indramayu District, West Java Province, Indonesia, has a sequential above normal monthly rainfall condition capable of causing flooding. This natural hazard occurs because Indramayu is a coastal lowland which receives water from adjacent districts especially during rainy season. Meanwhile the sequential below normal monthly rainfall is factually able to trigger drought occurrences. This condition proves Indramayu to be a very sensitive area to the water availability. Coping with this situation, the optimal rainfall prediction is urgently needed. The Weighted Ensemble Prediction System (WEPS) model based on several output of Single Prediction System (SPS) models such as ANFIS model, Wavelet-ANFIS model, Wavelet-ARIMA model, and ARIMA model of monthly rainfall, has been simulated in this district. The WEPS model was developed in order to minimize the inco...

Agromet, 2007

A study of long term shift of the daily rainfall over the Brantas catchment East Java was done. S... more A study of long term shift of the daily rainfall over the Brantas catchment East Java was done. Such a study is relatively new for the country due to lack of good quality data and sparsely distributed data all over the region. With a good quality long-term daily rainfall data over the Brantas catchment, we could detect a statistical shift of amount of rainy days, shift between periods and frequency trend changes from weekly, monthly, three-monthly and annually. The study utilized several methods including the probability density function distribution shift, Mann Kendall non parametric trend test and the wavelet analyses. The shift of low amount rainfall occurs from the dry to the wet season. We found distinct influences of orography and ENSO years in our trend tests. Additionally, the result of the Mann Kendall test show that the trend of rainy days increase during the wet season and the second transition period, while decrease during the dry season and first transitional period. Me...

Jurnal Sains & Teknologi Modifikasi Cuaca, 2002

The IPBES Plenary, at IPBES 7 (April/May 2019, Paris), adopted a new work programme (2019-2030; a... more The IPBES Plenary, at IPBES 7 (April/May 2019, Paris), adopted a new work programme (2019-2030; available here), following up on the first IPBES work programme 2014-2018, which includes, under its first objective, work on the interlinkages between biodiversity and climate change. In the same decision, the Plenary requested the Executive Secretary to explore with the secretariat of IPCC possible joint activities on biodiversity and climate change. As a first step in this collaboration, a <strong>workshop co-sponsored by IPBES and IPCC will take place in 2020</strong>.

The error analyses and simulations of the co- and cross-polar characters of chaff and rainfall ha... more The error analyses and simulations of the co- and cross-polar characters of chaff and rainfall have been done. Error analyses include the ZDR distribution, numbers of scaterers, the orientation and shape dependence, the system DC bias, the channel gain imbalance and the quantification errors. There is no effect of number of scatterers on the noise. The orientation and shape dependence study indicates wider frequency distribution of ZDR from chaff is because of the chaff's needle shape. The orientation of chaff contributes insignificantly to noises The noises has been reduced considerably after eliminating system DC bias and gaining more channel balance. Further possible source of error is the quantification error in data analyses. LDR is more useful than ZDR when both chaff and rain are present. The result suggests a possibility of using chaff’s LDR in tracing air movement. Analisa error dan simulasi sifat co- dan cross-polar dari chaff dan butir -butir hujan telah dilakukan. An...

Billboard advertising is one of the components that build a city which has a major influence on t... more Billboard advertising is one of the components that build a city which has a major influence on the beauty of the city. Therefore the billboard advertising installation should be organized and planned to create the comfortable spatial environment. Due to the advertisement media can be the one of an element that makes the beauty of city if it well organized. The purpose of the research are: Unravel the potential and problems of billboards advertising in Cihampelas road corridor; Improving the quality of billboard organizing in corridor Cihampelas; and creating the free-visual-pollution in Cihampelas corridor and has an aesthetics city design as the trade and service area. The analysis used in the research is a content analysis which is the qualitative technic that examines the solution formula based on the existing conditions with the criteria that suitable with the study of billboard arrangement's elements in Cihampelas street in Bandung. To reduce the complexity level of outdoor advertising types and sign, and to clarify the impact of the sign placement on the surrounding environment, the outdoor advertising and sign are classified into several groups which based on the consideration of the visual character possessed, the impact on the environment character, and based on the functions and needs.

This dissertation describes the analysis of the monthly, seasonal and interannual rainfall variab... more This dissertation describes the analysis of the monthly, seasonal and interannual rainfall variabilities over the Maritime Continent and describes the potentials and limits of a wide range of climate models in simulating these variabilities. The study analyzes the simulated rainfall variability from two global reanalyses, an atmospheric general circulation model (AGCM), an atmospheric regional climate model (RCM) and an ocean general circulation model (OGCM). The two reanalyses and the AGCM output is available at T42 and T106 resolutions, while the RCM resolves 0.5◦ and 1/6◦. The study explores the uncoupled as well as the coupled mode of RCM and OGCM and focuses mainly on the period 1979 to 1993. With a regionalization method introduced in this study, the Maritime Continent is divided into three distinct climate regions, the south monsoonal, the northwest semi-monsoonal and the Molucca anti-monsoonal region. All three regions show different responses to monsoon and El Niño/Southern...

Kajian temporal dari sifat iklim Indonesia berdasarkan pola curah hujan rata-rata bulanan telah d... more Kajian temporal dari sifat iklim Indonesia berdasarkan pola curah hujan rata-rata bulanan telah dilakukan dengan mengacu pada beberapa parameter ECMWF seperti angin 850 mb, OLR dan suhu permukaan. Parameter ECMWF tersebut dapat menjelaskan hampir semua pola kecuali daerah yang terdapat pola gangguan lokal. Dengan kajian temporal ini, penulis menemukan ITCZ, daerah siklon di utara Australia dan aktivitas monsun yang dominan pada beberapa bulan. Hasil lainnya menunjukkan adanya perioda transisi pada bulan April dan Oktober yang dapat dimengerti dari pola angin 850 mb dan suhu permukaan. Juga dijelaskan bahwa puncak hujan tahunan di Bali ke Timor lebih banyak dipengaruhi oleh siklon tropis di utara Australia daripada monsun Asia. Temporal assesment of Indonesian climate characteristic based on monthly rainfall pattern was done with several ECMWF (European Center for Medium Range Weather Forecast) parameters; i.e. wind field of 850 mb, Outgoing Longwave Radiation (OLR) and surface tempe...

Abstrak. Dengan letaknya diantara dua benua dan dua samudera serta berada di garis khatulistiwa, ... more Abstrak. Dengan letaknya diantara dua benua dan dua samudera serta berada di garis khatulistiwa, maka benua maritim Indonesia merupakan salah satu pusat konveksi utama dunia. Dengan kenyataan demikian maka Indonesia menghadapi risiko yang besar dari tingginya variabilitas iklim dan ekstremitas iklim. Guna menghadapi dampak dari iklim ekstrem maka diperlukan strategi yang mumpuni untuk membuat suatu peringatan dini secara nasional. Dengan desakan jumlah populasi dan kecanggihan teknologi informasi maka kedepan diperlukan sistem peringatan dini yang dapat menjangkau secara luas dan cepat menghadapi perubahan yang terjadi. Sebuah sistem peringatan dini yang juga harus dapat mengantisipasi dampak dan risiko. Sistem peringatan dini yang dibangun merupakan mata rantai dari pengamatan di lapangan, pengolahan data dan analisa serta sistem diseminasi yang memadai. Tulisan ini mengulas sistem peringatan dini iklim untuk sektor pertanian dengan evolusi sistem berbagi data, informasi, sistem in...

The INSIDE project (Indonesian Smoke Induced by Drought Episodes) within the Asia Pro Eco Program... more The INSIDE project (Indonesian Smoke Induced by Drought Episodes) within the Asia Pro Eco Program of the European Commission aims to determine the amount and distribution of smoke-haze in Indonesia and the adjacent countries generated from vegetation and peat fires, and the related implications for human health (e.g. respiratory diseases) and climate (droughts, floods, aerosol-cloud interactions, CO2 release). The main goal of the project is to provide, optimise and apply a regional model tool for Indonesia.

Indonesian Journal of Geography, 2006

Spatial and temporal rainfall analyses of the Brantas Catchment Area from 1955 to 2002 based on 4... more Spatial and temporal rainfall analyses of the Brantas Catchment Area from 1955 to 2002 based on 40 daily rainfall stations has been performed. To identify the climate pattern for the last five decades, we used the Empirical Orthogonal Function (EOF) followed by the Fast Fourier Transform. By using EOF, we found the monsoonal pattern as the most dominant, which explains about 72% of all variances. The interannual pattern shows a negative trend of the monsoonal strength. From the monthly isohyets for each decade, the rainfall amount appears to decrease significantly during the last five decades, indicated by wider low rainfall amount areas and the orographic effect is detected, indicated by always greater amount in highlands. From rainfall data in mountain and coastal areas, dry periods had been increasing, mainly in lowlands. Thus, the continued imbalance of the dry and wet period is one cause of the monsoonal strength decrease during the last five decades.

International Journal of Climatology, 2020

Forum Geografi, 2020

Nyepi or the Balinese Day of Silence (DOS) is a day when people celebrate every New Year accordin... more Nyepi or the Balinese Day of Silence (DOS) is a day when people celebrate every New Year according to the Balinese calendar (Saka). On that day, all resident activities were very restricted, with no outdoor activities. This event, which only lasted for 24 hours, is a unique period to conduct air quality measurements such as Total Suspended Particulate (TSP) for assessing the influence of human activities. This study only focuses on TSP monitoring before, during and after the DOS and its comparison with the meteorological data. TSP concentration measurements were conducted in 2 urban areas (Badung and Ubung) and a sub-urban area (Singaraja) from March 17 to March 25, 2015. The results show that TSP concentrations are negatively correlated with temperature and wind speed at each location. Hourly TSP concentrations during DOS are lower than the averaged TSP concentrations before and after DOS. During DOS, TSP concentrations decreased significantly in urban areas by 73-78% relative to r...

Jurnal Meteorologi dan Geofisika, 2012

Jurnal Meteorologi dan Geofisika, 2013

Prediksi awal musim hujan merupakan suatu hal penting yang menunjang beberapa sektor di antaranya... more Prediksi awal musim hujan merupakan suatu hal penting yang menunjang beberapa sektor di antaranya di sektor pertanian. Prediksi awal musim dipergunakan sebagai pertimbangan untuk menentukan kegiatan penanam padi khususnya penentuan awal musim tanam. Untuk menentukan awal musim hujan biasanya ditandai dengan perubahan sirkulasi atmosfer yang cukup signifikan misalnya perubahan arah angin, tekanan udara permukaan dan daerah liputan awan. Untuk penelitian ini dipergunakan 17 prediktor yang telah dipilih berdasarkan tes korelasi spasial antara prediktor dan awal musim. Penelitian ini difokuskan di daerah Pantura Jawa Barat yang terdiri dari Karawang, Subang, Indramayu dan Cirebon yang merupakan daerah sentra pangan khususnya beras. Wilayah Pantura memasok sekitar 30% kebutuhan beras untuk Jawa Barat. Dari 17 prediktor yang terpilih kemudian dimasukkan ke dalam model regresi dengan melakukan semua kemungkinan kombinasi sehingga didapatkan model yang terbaik dengan menggunakan indikator mean square error terkecil. Untuk semua model yang disimulasikan diperlihatkan bahwa hampir semua model menghasilkan hasil yang baik baik baik pada kondis tahun normal maupun pada saat terjdinya El Nino dan La Nina.

IOP Conference Series: Earth and Environmental Science, 2019

The criteria of season onset and withdrawal in Indonesia determined by Agency for Meteorology Cli... more The criteria of season onset and withdrawal in Indonesia determined by Agency for Meteorology Climatology and Geophysics (BMKG) which need a month to confirm the period of the wet season and dry season. The determination of season onset based on the amount of 10-day rainfall equal to or more than 50 millimeters (mm) followed by the next two 10-day rainfall (the amount of monthly rainfall equal or more than 150 mm) for the wet season and vice versa. The determination of 150 mm/month based on water requirement using the reference of evapotranspiration (ETo) in the territory of Indonesia at 5 mm per day. This paper evaluates the determination of season onset by comparing it based on the ETo value of 5 mm/day and ETo from observation data of pan evaporation in the islands of Java and Bali in the period 2003 - 2017. The result of the study shows that the difference of the dry season onset up to 3 months which 25.9 % of stations have no difference, 40.7% have 1-month difference, 22.2% hav...

Journal of Geophysical Research: Atmospheres, 2019

An extreme biomass burning event occurred in Indonesia from September through October 2015 due to... more An extreme biomass burning event occurred in Indonesia from September through October 2015 due to severe drought conditions, partially caused by a major El Niño event, thereby allowing for significant burning of peatland that had been previously drained. This event had the highest sustained aerosol optical depths (AODs) ever monitored by the global Aerosol Robotic Network (AERONET). The newly developed AERONET Version 3 algorithms retain high AOD at the longer wavelengths when associated with high Ångström exponents (AEs), which thereby allowed for measurements of AOD at 675 nm as high as approximately 7, the upper limit of Sun photometry. Measured AEs at the highest monitored AOD levels were subsequently utilized to estimate instantaneous values of AOD at 550 nm in the range of 11 to 13, well beyond the upper measurement limit. Additionally, retrievals of complex refractive indices, size distributions, and single scattering albedos (SSAs) were obtained at much higher AOD levels than possible from almucantar scans due to the ability to perform retrievals at smaller solar zenith angles with new hybrid sky radiance scans. For retrievals made at the highest AOD levels the fine-mode volume median radii were~0.25-0.30 micron, which are very large particles for biomass burning. Very high SSA values (~0.975 from 440 to 1,020 nm) are consistent with the domination by smoldering combustion of peat burning. Estimates of the percentage peat contribution to total biomass burning aerosol based on retrieved SSA and laboratory measured peat SSA were~80-85%, in excellent agreement with independent estimates.

IOP Conference Series: Earth and Environmental Science, 2019

The relative impacts of the El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) eve... more The relative impacts of the El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) events of Rice Cropping Calendar on Equatorial and Monsoon Region of Indonesia were studied. The spatial distribution of partial correlations between rainfalls with the ENSO and IOD over West Sumatera and West Java indicated a significant impact on rainfall anomalies normally along the period of September-November. The ENSO and IOD events, which is known as a monsoon type, had a wider impact in West Java, especially over northern of West Java. On the other hand, there was only a little impact of the ENSO and IOD on rainfall anomalies in the southern-west of West Sumatera. This strength was shown to be associated with the evolution of distinct weather types revealed by Pearson analysis. In these regions, the same impact of the ENSO and IOD on the width of planting area was very weak in the period of December-March whereas that in the period of June-November the impact on West Sumatera reached only 10% moreover, the impact in West Java could reach up to 80%. On the period scales, the ENSO and IOD events had significant impacts to delayed onsets of rice cropping calendar in which they were more intense than previous ones. In general, the magnitude of ENSO-delayed onsets was greater than delays to the IOD. The period-stratified ENSO variability during each of the months from September to November had a significant impact of delayed planting 2 to 4 dekads in West Sumatera and 4 to 6 dekads on West Java. This confirmed that strong ENSO events indeed affected the southern of West Sumatera and northern of West Java. Meanwhile, the period-stratified IOD variability on West Sumatera and West Java had a significant impact of delayed planting 2 to 4 dekads.

A number of crop growth simulation models have been developed using the radiation use efficiency ... more A number of crop growth simulation models have been developed using the radiation use efficiency (RUE) concept to predict crop growth and yield in various environments. These models generally calculate daily biomass production as the product of the quantity of radiation intercepted and RUE. Besides that biomass production was deterimined by water and nitrogen available factor. So, this research was carried out to quantify the RUE, biomass and leaf area index on Jatropha under rainfall condition, four levels of nitrogen fertilizer (N) and two and three population densities (P) planted twice. The experiments used a systematic Nelder fan design with 9 spokes and 4 – 5 rings were conducted at SEAMEO-BIOTROP field experiment in 2007. Data from the first experiment were used for parameterization and calibration and the second experiment data for model validation. Based on parameterization, we found that RUE can prediction above ground biomass accumulation of Jatropha were 0.94 (r=0.83) g ...

International Journal of Sciences: Basic and Applied Research, 2015

Water distribution is very crucial especially in regions vulnerable to the water availability. Th... more Water distribution is very crucial especially in regions vulnerable to the water availability. The events in the specific region of Indramayu District, West Java Province, Indonesia, has a sequential above normal monthly rainfall condition capable of causing flooding. This natural hazard occurs because Indramayu is a coastal lowland which receives water from adjacent districts especially during rainy season. Meanwhile the sequential below normal monthly rainfall is factually able to trigger drought occurrences. This condition proves Indramayu to be a very sensitive area to the water availability. Coping with this situation, the optimal rainfall prediction is urgently needed. The Weighted Ensemble Prediction System (WEPS) model based on several output of Single Prediction System (SPS) models such as ANFIS model, Wavelet-ANFIS model, Wavelet-ARIMA model, and ARIMA model of monthly rainfall, has been simulated in this district. The WEPS model was developed in order to minimize the inco...

Agromet, 2007

A study of long term shift of the daily rainfall over the Brantas catchment East Java was done. S... more A study of long term shift of the daily rainfall over the Brantas catchment East Java was done. Such a study is relatively new for the country due to lack of good quality data and sparsely distributed data all over the region. With a good quality long-term daily rainfall data over the Brantas catchment, we could detect a statistical shift of amount of rainy days, shift between periods and frequency trend changes from weekly, monthly, three-monthly and annually. The study utilized several methods including the probability density function distribution shift, Mann Kendall non parametric trend test and the wavelet analyses. The shift of low amount rainfall occurs from the dry to the wet season. We found distinct influences of orography and ENSO years in our trend tests. Additionally, the result of the Mann Kendall test show that the trend of rainy days increase during the wet season and the second transition period, while decrease during the dry season and first transitional period. Me...

Jurnal Sains & Teknologi Modifikasi Cuaca, 2002

The IPBES Plenary, at IPBES 7 (April/May 2019, Paris), adopted a new work programme (2019-2030; a... more The IPBES Plenary, at IPBES 7 (April/May 2019, Paris), adopted a new work programme (2019-2030; available here), following up on the first IPBES work programme 2014-2018, which includes, under its first objective, work on the interlinkages between biodiversity and climate change. In the same decision, the Plenary requested the Executive Secretary to explore with the secretariat of IPCC possible joint activities on biodiversity and climate change. As a first step in this collaboration, a <strong>workshop co-sponsored by IPBES and IPCC will take place in 2020</strong>.

The error analyses and simulations of the co- and cross-polar characters of chaff and rainfall ha... more The error analyses and simulations of the co- and cross-polar characters of chaff and rainfall have been done. Error analyses include the ZDR distribution, numbers of scaterers, the orientation and shape dependence, the system DC bias, the channel gain imbalance and the quantification errors. There is no effect of number of scatterers on the noise. The orientation and shape dependence study indicates wider frequency distribution of ZDR from chaff is because of the chaff's needle shape. The orientation of chaff contributes insignificantly to noises The noises has been reduced considerably after eliminating system DC bias and gaining more channel balance. Further possible source of error is the quantification error in data analyses. LDR is more useful than ZDR when both chaff and rain are present. The result suggests a possibility of using chaff’s LDR in tracing air movement. Analisa error dan simulasi sifat co- dan cross-polar dari chaff dan butir -butir hujan telah dilakukan. An...

Billboard advertising is one of the components that build a city which has a major influence on t... more Billboard advertising is one of the components that build a city which has a major influence on the beauty of the city. Therefore the billboard advertising installation should be organized and planned to create the comfortable spatial environment. Due to the advertisement media can be the one of an element that makes the beauty of city if it well organized. The purpose of the research are: Unravel the potential and problems of billboards advertising in Cihampelas road corridor; Improving the quality of billboard organizing in corridor Cihampelas; and creating the free-visual-pollution in Cihampelas corridor and has an aesthetics city design as the trade and service area. The analysis used in the research is a content analysis which is the qualitative technic that examines the solution formula based on the existing conditions with the criteria that suitable with the study of billboard arrangement's elements in Cihampelas street in Bandung. To reduce the complexity level of outdoor advertising types and sign, and to clarify the impact of the sign placement on the surrounding environment, the outdoor advertising and sign are classified into several groups which based on the consideration of the visual character possessed, the impact on the environment character, and based on the functions and needs.

This dissertation describes the analysis of the monthly, seasonal and interannual rainfall variab... more This dissertation describes the analysis of the monthly, seasonal and interannual rainfall variabilities over the Maritime Continent and describes the potentials and limits of a wide range of climate models in simulating these variabilities. The study analyzes the simulated rainfall variability from two global reanalyses, an atmospheric general circulation model (AGCM), an atmospheric regional climate model (RCM) and an ocean general circulation model (OGCM). The two reanalyses and the AGCM output is available at T42 and T106 resolutions, while the RCM resolves 0.5◦ and 1/6◦. The study explores the uncoupled as well as the coupled mode of RCM and OGCM and focuses mainly on the period 1979 to 1993. With a regionalization method introduced in this study, the Maritime Continent is divided into three distinct climate regions, the south monsoonal, the northwest semi-monsoonal and the Molucca anti-monsoonal region. All three regions show different responses to monsoon and El Niño/Southern...

Kajian temporal dari sifat iklim Indonesia berdasarkan pola curah hujan rata-rata bulanan telah d... more Kajian temporal dari sifat iklim Indonesia berdasarkan pola curah hujan rata-rata bulanan telah dilakukan dengan mengacu pada beberapa parameter ECMWF seperti angin 850 mb, OLR dan suhu permukaan. Parameter ECMWF tersebut dapat menjelaskan hampir semua pola kecuali daerah yang terdapat pola gangguan lokal. Dengan kajian temporal ini, penulis menemukan ITCZ, daerah siklon di utara Australia dan aktivitas monsun yang dominan pada beberapa bulan. Hasil lainnya menunjukkan adanya perioda transisi pada bulan April dan Oktober yang dapat dimengerti dari pola angin 850 mb dan suhu permukaan. Juga dijelaskan bahwa puncak hujan tahunan di Bali ke Timor lebih banyak dipengaruhi oleh siklon tropis di utara Australia daripada monsun Asia. Temporal assesment of Indonesian climate characteristic based on monthly rainfall pattern was done with several ECMWF (European Center for Medium Range Weather Forecast) parameters; i.e. wind field of 850 mb, Outgoing Longwave Radiation (OLR) and surface tempe...

Abstrak. Dengan letaknya diantara dua benua dan dua samudera serta berada di garis khatulistiwa, ... more Abstrak. Dengan letaknya diantara dua benua dan dua samudera serta berada di garis khatulistiwa, maka benua maritim Indonesia merupakan salah satu pusat konveksi utama dunia. Dengan kenyataan demikian maka Indonesia menghadapi risiko yang besar dari tingginya variabilitas iklim dan ekstremitas iklim. Guna menghadapi dampak dari iklim ekstrem maka diperlukan strategi yang mumpuni untuk membuat suatu peringatan dini secara nasional. Dengan desakan jumlah populasi dan kecanggihan teknologi informasi maka kedepan diperlukan sistem peringatan dini yang dapat menjangkau secara luas dan cepat menghadapi perubahan yang terjadi. Sebuah sistem peringatan dini yang juga harus dapat mengantisipasi dampak dan risiko. Sistem peringatan dini yang dibangun merupakan mata rantai dari pengamatan di lapangan, pengolahan data dan analisa serta sistem diseminasi yang memadai. Tulisan ini mengulas sistem peringatan dini iklim untuk sektor pertanian dengan evolusi sistem berbagi data, informasi, sistem in...

The INSIDE project (Indonesian Smoke Induced by Drought Episodes) within the Asia Pro Eco Program... more The INSIDE project (Indonesian Smoke Induced by Drought Episodes) within the Asia Pro Eco Program of the European Commission aims to determine the amount and distribution of smoke-haze in Indonesia and the adjacent countries generated from vegetation and peat fires, and the related implications for human health (e.g. respiratory diseases) and climate (droughts, floods, aerosol-cloud interactions, CO2 release). The main goal of the project is to provide, optimise and apply a regional model tool for Indonesia.

Indonesian Journal of Geography, 2006

Spatial and temporal rainfall analyses of the Brantas Catchment Area from 1955 to 2002 based on 4... more Spatial and temporal rainfall analyses of the Brantas Catchment Area from 1955 to 2002 based on 40 daily rainfall stations has been performed. To identify the climate pattern for the last five decades, we used the Empirical Orthogonal Function (EOF) followed by the Fast Fourier Transform. By using EOF, we found the monsoonal pattern as the most dominant, which explains about 72% of all variances. The interannual pattern shows a negative trend of the monsoonal strength. From the monthly isohyets for each decade, the rainfall amount appears to decrease significantly during the last five decades, indicated by wider low rainfall amount areas and the orographic effect is detected, indicated by always greater amount in highlands. From rainfall data in mountain and coastal areas, dry periods had been increasing, mainly in lowlands. Thus, the continued imbalance of the dry and wet period is one cause of the monsoonal strength decrease during the last five decades.

International Journal of Climatology, 2020

Forum Geografi, 2020

Nyepi or the Balinese Day of Silence (DOS) is a day when people celebrate every New Year accordin... more Nyepi or the Balinese Day of Silence (DOS) is a day when people celebrate every New Year according to the Balinese calendar (Saka). On that day, all resident activities were very restricted, with no outdoor activities. This event, which only lasted for 24 hours, is a unique period to conduct air quality measurements such as Total Suspended Particulate (TSP) for assessing the influence of human activities. This study only focuses on TSP monitoring before, during and after the DOS and its comparison with the meteorological data. TSP concentration measurements were conducted in 2 urban areas (Badung and Ubung) and a sub-urban area (Singaraja) from March 17 to March 25, 2015. The results show that TSP concentrations are negatively correlated with temperature and wind speed at each location. Hourly TSP concentrations during DOS are lower than the averaged TSP concentrations before and after DOS. During DOS, TSP concentrations decreased significantly in urban areas by 73-78% relative to r...

Jurnal Meteorologi dan Geofisika, 2012

Jurnal Meteorologi dan Geofisika, 2013

Prediksi awal musim hujan merupakan suatu hal penting yang menunjang beberapa sektor di antaranya... more Prediksi awal musim hujan merupakan suatu hal penting yang menunjang beberapa sektor di antaranya di sektor pertanian. Prediksi awal musim dipergunakan sebagai pertimbangan untuk menentukan kegiatan penanam padi khususnya penentuan awal musim tanam. Untuk menentukan awal musim hujan biasanya ditandai dengan perubahan sirkulasi atmosfer yang cukup signifikan misalnya perubahan arah angin, tekanan udara permukaan dan daerah liputan awan. Untuk penelitian ini dipergunakan 17 prediktor yang telah dipilih berdasarkan tes korelasi spasial antara prediktor dan awal musim. Penelitian ini difokuskan di daerah Pantura Jawa Barat yang terdiri dari Karawang, Subang, Indramayu dan Cirebon yang merupakan daerah sentra pangan khususnya beras. Wilayah Pantura memasok sekitar 30% kebutuhan beras untuk Jawa Barat. Dari 17 prediktor yang terpilih kemudian dimasukkan ke dalam model regresi dengan melakukan semua kemungkinan kombinasi sehingga didapatkan model yang terbaik dengan menggunakan indikator mean square error terkecil. Untuk semua model yang disimulasikan diperlihatkan bahwa hampir semua model menghasilkan hasil yang baik baik baik pada kondis tahun normal maupun pada saat terjdinya El Nino dan La Nina.