Chlorophyll-a Distribution and Its Relation with Current Pattern in Northern Waters of Central Java (original) (raw)
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The decline in fish catches in 2018-2020 becomes a problem experienced by fishermen in the southern waters of Java island. This affects fishermen whose livelihoods are from marine products. From these problems, the purpose of the research is to analyze the fishermen's catches in the southern waters of Java island in 2018 and 2020 based on chlorophyll-a fertility and sea surface temperature (SST), and supported by upwelling phenomena and determination of Potential Fishing Zones. The method used is secondary data analysis taken from MODIS Level 3 imagery to visualize water conditions. The concentration of chlorophyll-a in the eastern season of 2018 had an average of 0.4-0.6 mg/m 3 with a sea surface temperature of 25.9-27.8°C. In 2020, there was a decrease by an average of 0.3-0.4 mg/m 3 with a sea surface temperature of 26.7-28.3°C. This is proved by all significance values of paired t-test less than 0.005. That is, there is a significant difference between both periods. In 2018, the widest strong upwelling was in July with an area of 13,0723.94 km 2. In 2020, it occurred in June with an area of 41,515.86 km 2. The most potential fishing zones of 2018 were in August as many as 254 points and in 2020 in July 154 points. High chlorophyll-a with low sea surface temperature levels, strong upwelling areas, and dominant potential fishing zones are mostly found in areas proximate to the coast compared to those further away from the coast.
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The dynamics of oceanography affect the existence and distribution of fishes. Fishes will look for suitable water conditions for their living habitat. Changes in oceanographic parameters such as temperature, salinity, water fertility, weather, and other parameters are factors associated with it. The SST and Chl-α were the main indicators in determining the presence of fishes, especially for pelagic fishes. Mackerel is one of the prominent commodities in the northern waters of West Java. Changes in water conditions globally also affect the conditions in the territorial waters. This is of course also affecting the existence of mackerel. Therefore, it is necessary to do a study to find out the range of SST and Chl-α values to estimate of mackerel seasonal abundance and distribution in the northern waters of West Java. This research uses an observation method with a combination of remote sensing approaches and filed data. The data used to result from the acquisition of Aqua MODIS satell...
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The analysis of chlorophyll-a distribution in fishing areas of Aceh Waters
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The distribution and abundance of fish are strongly influenced by several oceanographic parameters, one of which is chlorophyll-a. Chlorophyll-a is one of the oceanographic parameters that play an important role in primary productivity in the sea. The distribution of chlorophyll-a contained in phytoplankton can be used as a measure of fertility in water. With advances in geographic information systems or remote sensing, the distribution of chlorophyll-a can be used to estimate fish catchment areas. This study aims to look at the distribution of chlorophyll-a in Aceh waters both spatially and temporally to predict fishing locations. This study used satellite imagery combined with a Geographic Information System (GIS) to detect chlorophyll-a’s distribution. The results of satellite image processing show that the average monthly value of chlorophyll-a in Aceh waters ranges from 2.71 – 23.54 mg/m3, areas with high chlorophyll-a are generally located in the western waters of Aceh to the ...
Variability of Surface Chlorophyll-a in the Makassar Strait – Java Sea, Indonesia
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Eleven years (2002-2012) of surface chlorophyll-a (chl-a) data from the Aqua-MODIS satellite were analyzed to determine spatial pattern and temporal variation in the key region for the small pelagic fishery between the Makassar Strait and the Java Sea Indonesia. The surface chl-a time-series data can be explained by the first two eigenvectors mode, which accounted for about 90% of total variance. The first eigenvector mode (86%) displays a map of contours that are maxima in the northern Java and western Sulawesi, and are minima around Kalimantan. The corresponding principal component is mostly the annual fluctuation of chl-a with a maximum (minimum) during the peak of the northwest monsoon (the southeast monsoon) periods. There is a phase-lag of about 6-month of chl-a maxima between the northern Makassar Strait and the western Java Sea. On inter-annual time-scale fluctuation of chl-a is well correlated with the El Nino Southern Oscillation variability in the Pacific Ocean, as we...
International Journal of Remote Sensing and Earth Sciences (IJReSES), 2017
This study aimed to estimate the concentration of chlorophyll-a from satellite imagery of National Polar-Orbiting Operational Environmental Satellite System (NPOESS) Preparatory Project (NPP) in the south Java Sea waters and compare it to the concentrations of chlorophyll-a estimation result from the MODIS-Aqua satellite. NPP satellite had Visible/Infrared Imager Radiometer Suite (VIIRS) sensors which performance was same as Moderate Resolution Imaging Spectroradiometer (MODIS) sensor with a better spatial resolution. This study used daily satellite imagery of VIIRS-NPP for the period of September 2012 to August 2013. The algorithm that was used to estimate the concentration of chlorophyll-a was Ocean Color 3-band ratio (OC-3). The results showed that the spatial distribution pattern of chlorophyll-a concentration between VIIRS-NPP sensor and MODIS had the same pattern, but the estimation of chlorophyll-a concentration from the MODIS sensor was higher than VIIRS-NPP sensor. The concentration of chlorophyll-a showed that there were spatial and temporal variation in the south Java Sea waters. Generally, concentrations of chlorophyll-a was higher in East monsoon than West monsoon.
Spatial-Temporal Distribution of Chlorophyll-A in Southern Part of the Makassar Strait
Jurnal Ilmu Kelautan SPERMONDE
Surface chlorophyll-a (Chl-a) distribution have been analyzed with seasonal variation during southeast monsoon in southern part of Makassar Strait and Flores Sea. Satellite data of Landsat-8 is applied to this study to formulate the distribution of chlorophyll concentration during monsoonal wind period. The distribution of chlorophyll concentration was normally peaked condition in August during southeast monsoon. Satellite data showed that a slowdown in the rise of the distribution of chlorophyll in September with a lower concentration than normal is likely due to a weakening the strength of southeast trade winds during June – July – August 2016. Further analysis shows that the southern part of the Makassar strait is likely occurrence of upwelling characterized by increase in surface chlorophyll concentrations were identified as the potential area of fishing ground.
One of abundance of nutrient in coastal area is chlorophyll-a, where chlorophyll-a is a driving factor to derive fishing ground location. There's several method has been used to derive chlorophyll-a concentration from insitu data, remote sensing satellite data, and ocean dynamics models, but we are not decide those data for certain area in coastal area and open ocean. In this paper, we will use Aqua-Terra MODIS, Landsat-8 and INDESO Satellite observation dataset to detect chlorophyll-a and also using dynamic modelling produced by INDESO and MyOcean/Marine Copernicus. Using a lot variation of data to understand the differences of spatial resolution and accuracy with observed insitu data. After calculating data comparison with in-situ data in Bali Strait on 2014, we can conclude that Landsat-8 data has the highest r value r=0.41. For model data, a comparison between in-situ data and MyOcean data has r=0.3. in the other hand, in-situ data and INDESO data model has r=0.26. In coastal areas (case 2 water), Landsat-8 data performed to give detail information of chlorophyll-a. Furthermore, for open ocean areas (case 1 water), we can use a numerical model from MyOcean/Marine Copernicus because it has lower resolution and able to forecast. For those data, it can help non-artisanal fisheries to predict chlorophyll-a area in their fishing ground areas
Asian Journal of Fisheries and Aquatic Research
Trophic status is an indicator of water fertility. In general, there are 3 classifications of trophic status, namely oligotrophic, mesotrophic and eutrophic [1]. According to Linus et al. [2] Chlorophyll-a phytoplankton is often used as an indicator of water quality and water fertility status. This research is to determine the trophic status of the waters based on the concentration of chlorophyll-a in the Cikidang Pangandaran river for the development of fisheries management. The research was conducted from November 2021 - January 2022. The method used was a survey method with a purposive sampling technique. The results showed that the concentration of chlorophyll-a ranged from 3.10-7.77 mg/m3. So it can be said that the trophic status of the Cikidang River is mesotrophic or moderate fertility. Parameters of supporting water quality are temperatures ranging from 26.75-29.570C, Light Transparency ranging from 16.12-135.75 cm, pH ranging from 7.38-7.48, Carbon dioxide ranging from 19....