Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal

The spatial and temporal variation of rainfall, Tmax and Tmin (mean maximum and minimum temperature) and ΔT (Tmax -Tmin) of different Regions of Bangladesh and Sea Surface Temperature (SST) of Northern Bay of Bengal at seasonal and annual timescales for the period of 1981–2019 have been investigated...

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Autor principal:	Mohammad Shohrab Hossain Sarker
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Monsoon season spatial temporal temperature rainfall homogeneity test Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/136e851bdb704eb9956a75b71fe9007f
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spelling	oai:doaj.org-article:136e851bdb704eb9956a75b71fe9007f2021-11-24T04:35:14ZRegional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal2667-010010.1016/j.envc.2021.100309https://doaj.org/article/136e851bdb704eb9956a75b71fe9007f2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2667010021002870https://doaj.org/toc/2667-0100The spatial and temporal variation of rainfall, Tmax and Tmin (mean maximum and minimum temperature) and ΔT (Tmax -Tmin) of different Regions of Bangladesh and Sea Surface Temperature (SST) of Northern Bay of Bengal at seasonal and annual timescales for the period of 1981–2019 have been investigated using a Linear regression test (LRT) and a student t-test in this study. Correlation analysis has been investigated between SST of the Bay of Bengal, and temperature or rainfall of the entire Coast. The regional differences of climatic trends were tested in each region against other regions via a student t-test. Results suggest that there is regional climatic variation between the Northwest and South Zones. There are significant regional differences in climatic trends found in this study. All seasons mean Tmax and Tmin are increasing except in winter when mean Tmax for the Northwest Region (- 0.005 °C/year), and Middile Zone (-0.003#x00A0;°C/year) and mean Tmin for some Southern Regions (e.g., Hilly Region) are decreasing in some seasons. Hilly Region is showing the highest increasing rates of mean Tmax across all seasons (annually at the rate of 0.04 °C/ year (p < 0.01) except in the monsoon season when mean Tmax for the Northwest region is highest (0.042 °C/year (p < 0.01)). Overall, the time series analysis suggests that in Bangladesh, annual mean Tmax and Tmin are increasing at the rate of 0.026 °C/year (p < 0.001) and 0.013 °C/year (p < 0.001), which is concurrent with the global temperature increase. The study also found that SST in Northern Bay of Bengal is increasing in all seasons except winter. The study revealed that the average temperature of most of the Coastal stations and the entire Coast have significant moderate correlations with SST, except for winter seasons for a few stations. At the same time, there is no to weak correlation between SST and rainfall across most seasons. A negative trend in rainfall across most seasons is visible, with an especially large decline during the summer monsoon. However, annual rainfall is decreasing (albeit not significantly) across the whole of Bangladesh since 1981, at a rate of - 6.7 mm/year.Mohammad Shohrab Hossain SarkerElsevierarticleMonsoonseasonspatialtemporal temperaturerainfallhomogeneity testEnvironmental sciencesGE1-350ENEnvironmental Challenges, Vol 5, Iss , Pp 100309- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Monsoon season spatial temporal temperature rainfall homogeneity test Environmental sciences GE1-350
spellingShingle	Monsoon season spatial temporal temperature rainfall homogeneity test Environmental sciences GE1-350 Mohammad Shohrab Hossain Sarker Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal
description	The spatial and temporal variation of rainfall, Tmax and Tmin (mean maximum and minimum temperature) and ΔT (Tmax -Tmin) of different Regions of Bangladesh and Sea Surface Temperature (SST) of Northern Bay of Bengal at seasonal and annual timescales for the period of 1981–2019 have been investigated using a Linear regression test (LRT) and a student t-test in this study. Correlation analysis has been investigated between SST of the Bay of Bengal, and temperature or rainfall of the entire Coast. The regional differences of climatic trends were tested in each region against other regions via a student t-test. Results suggest that there is regional climatic variation between the Northwest and South Zones. There are significant regional differences in climatic trends found in this study. All seasons mean Tmax and Tmin are increasing except in winter when mean Tmax for the Northwest Region (- 0.005 °C/year), and Middile Zone (-0.003#x00A0;°C/year) and mean Tmin for some Southern Regions (e.g., Hilly Region) are decreasing in some seasons. Hilly Region is showing the highest increasing rates of mean Tmax across all seasons (annually at the rate of 0.04 °C/ year (p < 0.01) except in the monsoon season when mean Tmax for the Northwest region is highest (0.042 °C/year (p < 0.01)). Overall, the time series analysis suggests that in Bangladesh, annual mean Tmax and Tmin are increasing at the rate of 0.026 °C/year (p < 0.001) and 0.013 °C/year (p < 0.001), which is concurrent with the global temperature increase. The study also found that SST in Northern Bay of Bengal is increasing in all seasons except winter. The study revealed that the average temperature of most of the Coastal stations and the entire Coast have significant moderate correlations with SST, except for winter seasons for a few stations. At the same time, there is no to weak correlation between SST and rainfall across most seasons. A negative trend in rainfall across most seasons is visible, with an especially large decline during the summer monsoon. However, annual rainfall is decreasing (albeit not significantly) across the whole of Bangladesh since 1981, at a rate of - 6.7 mm/year.
format	article
author	Mohammad Shohrab Hossain Sarker
author_facet	Mohammad Shohrab Hossain Sarker
author_sort	Mohammad Shohrab Hossain Sarker
title	Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal
title_short	Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal
title_full	Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal
title_fullStr	Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal
title_full_unstemmed	Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal
title_sort	regional spatial and temporal variability of rainfall, temperature over bangladesh and northern bay of bengal
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/136e851bdb704eb9956a75b71fe9007f
work_keys_str_mv	AT mohammadshohrabhossainsarker regionalspatialandtemporalvariabilityofrainfalltemperatureoverbangladeshandnorthernbayofbengal
_version_	1718415899584626688

Regional spatial and temporal variability of rainfall, temperature over Bangladesh and Northern Bay of Bengal

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