An Analysis of the Temperature Change of Dhaka City (original) (raw)
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Analysis of Temperature Change in Capital City of Bangladesh
Abstract Bangladesh faces multiple manifestations of climatic change and is one of the most vulnerable countries in the world. The study was carried out based on secondary information to assess the temperature trend in Dhaka city. The study revealed that average annual and seasonal temperature in Dhaka city is in an increasing trend during last couple of decades. From 1950s to 1960s average annual temperature was remained stable (25.10C) which is 0.60C lower than baseline temperature (25.70C). Then, temperature increased gradually (25.40C in 1970s and 25.80C in 1980s). During 1990s annual temperature remained stable but it was 0.10C higher than the baseline temperature. However, during 2000s annual temperature increased 0.20C which is 0.30C higher than the baseline temperature. Proper mitigation plans and adaptation policies are inevitable to minimize the impacts of climate change.
MAUSAM, 2021
Based on climatological data of maximum and minimum temperatures of seventeen stations for a period of 60 years (1949 - 2008), obtained from Bangladesh Meteorological Department (BMD), the changing pattern of temperature in Bangladesh has been investigated. Some characteristics of annual variation and spatial distribution of mean monthly minimum, mean monthly maximum and mean monthly temperature, annual variation and spatial distribution of mean monthly amplitude of temperature have been explained. The characteristics of changing pattern of temperature such as standard deviation, coefficient of variation, ratio between mean monthly maximum and mean monthly minimum temperatures have been studied. The run of the temperature in different stations for the years 1949-2008, the periodicity of mean annual temperature and mean decade deviations have been discussed. The integral curve of mean annual temperature for Dhaka has been prepared and explained. Regression analysis for mean monthly t...
The Climatic Condition of Bangladesh: Scenario of Dhaka
Asian Journal of Environment & Ecology, 2019
Bangladesh's climate is consisting of medium to high rainfall, high relative humidity, and high temperature. Due to global warming effects, Bangladesh subjected to many kinds of natural disasters. To understand climate change impacts in Bangladesh, one has to understand the climatic condition of this country. In this paper, annual rainfall, average maximum and minimum temperature and relative humidity data were collected and analyzed to understand the climatic condition of the country. It has been seen that, the rainfall rate of this country is decreasing year to year but the temperature is increasing than previous years. The average relative humidity is almost constant.
HISTORICAL TRENDS AND FUTURE PROJECTION OF CLIMATE AT DHAKA CITY OF BANGLADESH
Graphical abstract Abstract Dhaka, the capital city of Bangladesh is considered as one of the most vulnerable cities of the world to climate change. A study has been carried out to assess the historical changes as well as future changes in the climate of Dhaka city in order to propose necessary mitigation and adaptation measures. Statistical downscaling model (SDSM) was used for the projection of future changes in daily rainfall and temperature and non-parametric trend analysis was used to assess the changes in rainfall, temperature and related extremes. The impacts of projected changes in climate on urban infrastructure and livelihood in Dhaka city was finally assessed to propose necessary adaptation measures. The study revealed that night time temperature in Dhaka city has increased significantly at a rate of 0.22ºC/decade in last fifty year, which is support to increase continually in the future. Different temperature related extreme events are also found to increase significantly in Dhaka. On the other hand, no significant change in rainfall or rainfall related extremes are observed. Therefore, it can be remarked that imminent impacts of climate change will be due to the increase in temperature and temperature related extremes. The public health and the water and energy supply are likely to be imminent affected sector in the city due to climate change.
Trend analysis of maximum, minimum, and average temperatures in Bangladesh: 1961–2008
Theoretical and Applied Climatology, 2014
The present study is about the analysis of mean maximum and mean minimum temperatures carried out on annual, seasonal, and monthly timescales examining the data from 15 meteorological stations in Bangladesh for the period 1961-2008. Various spatial and statistical tools were used to display and analyze trends in temperature data. ArcGIS was used to produce the spatially distributed temperature data by using Thiessen polygon method. The nonparametric Mann-Kendall test was used to determine whether there is a positive or negative trend in data with their statistical significance. Sen's method was also used to determine the magnitude of the trends. The results reveal positive trends in annual mean and mean maximum temperatures with 95 % significance. Trend test reveals that the significant positive trend is found in June to November in case of mean maximum temperature, but according to the mean minimum temperature, the situation is different and a significant positive trend was found from November to February. The analysis of the whole record reveals a tendency toward warmer years, with significantly warmer summer periods and slightly colder winters. These warming patterns may have important impacts on energy consumption, water supply, human health, and natural environment in Bangladesh.
Changes in diurnal temperature range in Bangladesh during the time period 1961–2008
Atmospheric Research, 2012
Diurnal temperature range (DTR) is a meteorological indicator independent of internal climate variation and therefore, considered as a signature of observed climate change. It has been observed that global averaged DTR has decreased significantly in last fifty years. However, the change in DTR has regional and seasonal characteristics. A study has been carried out in this paper to analyze the spatial and seasonal patterns in the trends of DTR in Bangladesh. Daily temperature data from 18 stations for the time period 1961-2008 has been used for the study. The result shows that both mean minimum and mean maximum temperatures of Bangladesh have increased significantly at a rate of 0.15°C/decade and 0.11°C/decade, respectively. However, the increase of minimum temperature compared to maximum temperature is not high enough to cause a significant change in average diurnal temperature range in Bangladesh. Seasonal DTR trends show a decrease in winter and pre-monsoon DTR, and an increase in monsoon DTR.
Change in Temperature over Bangladesh Associated with Degrees of Global Warming
The aim of investigation of the research work is to study the temperature trend in Bangladesh. Long term changes of surface air temperature over Bangladesh have been studied using the available historical data collected by the Bangladesh Meteorological Department (BMD). Maximum, minimum and mean monthly temperature data of last sixty–three years (1948-2010) collected from 35 stations of BMD located all over the Bangladesh have been used in this study. It has been found that monthly maximum temperature shows a positive trend of increase at a rate of 0.5 C per 100 year. The maximum increase occurred during November at a rate of 2.05 C per 100 year. However, monthly minimum temperature shows more statistically significant trend of increase at a rate of 1.40 C per 100 year. The maximum increase occurred during February at a rate of 2.73 C per 100 year. Monthly mean temperature shows a positive trend of increase at a rate of 0.8 C per 100 year. It is clear found that monthly minimum temperature has been increased significantly during the winter season (October to February) over the last sixty-three years. This study also reveals that temperature has been increase predominantly over the last 21 years (1990-2010) than last 63 years (1948-2010). Bangladesh should also prepare adaptation policies to minimize the adverse effects of climate change. Vulnerabilities assessment, disaster management, enhanced structure design, institutional reform and anti extreme climate engineering are some feasible adaptation policies in Bangladesh due to increasing temperature.
Regional Variation of Temperature and Rainfall in Bangladesh: Estimation of Trend
Journal of Applied & Computational Mathematics, 2015
This study mainly focuses on exploring the regional variation of the changing patterns of temperature and rainfall in Bangladesh. The analysis is based on the temperature and rainfall variation in Bangladesh over five regions as Dhaka, Cox's Bazar, Rajshahi, Bogra and Sylhet. The duration of the study period was chosen as 1953-2012 for Dhaka,
Trend of rainfall and temperature in different regions of Bangladesh during the last five decades
Citation: Ali, M.H, A.K.M.R. Islam and M.G.M. Amin ( 2007). Trend of temperature and rainfall over Bangladesh during the last five decades. J. Agrometeorol.,9(1): 26-33. Abstract Time series of yearly and monthly rainfall, and monthly maximum and minimum temperatures at five stations covering different regions of Bangladesh were investigated for temporal and spatial trends. The study reveals no significant trend in annual rainfall. Significant decreasing trend of monthly rainfall during monsoon (wet season) at two stations and increasing trend during dry season at several stations are observed. Time series of monthly maximum and minimum temperatures appear to follow some trends, showing increase and decrease at two extremes, respectively. Time series of minimum temperature showed inconsistent trends throughout the year and also between stations.
Trend of rainfall and temperature in different regions of Bangladesh during last five decades
Journal of agrometeorology
fime series ol yearly and monthly rainfall, and monthly maximum and nrin r.rum temperatures at five stations covering different regions of Ban!,adesh were investigated for temporal and spatial trends. The study rcvo:r s no significant trend in annual rainfall. Significant decreasing trend ot nrontlrly rainfall during monsoon (wet season) at two stations and increasing