Staff View: Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation

Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation

Spatiotemporal changes in six precipitation and five temperature extreme indices of Bangladesh and their linkage with nine ocean-atmospheric oscillation indices have been evaluated in this study to provide necessary information for adaptation planning and development of early warning systems. Daily...

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Main Authors:	Islam, H. M. Touhidul, Islam, Abu Reza Md. Towfiqul, Al-Mahbub, Md. Abdullah, Shahid, Shamsuddin, Tasnuva, Anjum, Kamruzzaman, Mohammad, Hu, Zhenghua, Elbeltagi, Ahmed, Kabir, Mohammad Mahbub, Salam, Mohammed Abdus, Ibrahim, Sobhy M.
Format:	Article
Published:	Elsevier B.V. 2021
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/94028/ http://dx.doi.org/10.1016/j.atmosres.2021.105840
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spelling	my.utm.940282022-02-28T13:31:16Z http://eprints.utm.my/id/eprint/94028/ Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation Islam, H. M. Touhidul Islam, Abu Reza Md. Towfiqul Al-Mahbub, Md. Abdullah Shahid, Shamsuddin Tasnuva, Anjum Kamruzzaman, Mohammad Hu, Zhenghua Elbeltagi, Ahmed Kabir, Mohammad Mahbub Salam, Mohammed Abdus Ibrahim, Sobhy M. TA Engineering (General). Civil engineering (General) Spatiotemporal changes in six precipitation and five temperature extreme indices of Bangladesh and their linkage with nine ocean-atmospheric oscillation indices have been evaluated in this study to provide necessary information for adaptation planning and development of early warning systems. Daily maximum and minimum temperatures and precipitation for the period 1980–2017 recorded at 20 stations, homogeneously distributed over the country, were employed for this purpose. Modified Mann-Kendall (MMK) test was used to evaluate trends in weather extremes, and detrended fluctuation analysis (DFA) was employed to anticipate the possible continuation of existing trends in the future. The cross-wavelet transform (CWT) was used to evaluate the linkage of weather extremes with oscillation indices in the time-frequency domain. The results indicate an increase in hot extremes and a decrease in cool indices in Bangladesh. An increase in the continuous dry day (CDD) and one-day maximum precipitation (RX1day) was also observed, indicating gradual drying and more susceptibility to flash floods at the same time. DFA revealed the possible continuation of existing trends in temperature and precipitation indices. Almost all the climatic extreme indices of Bangladesh were found to follow periodic cycles with different frequencies. The hot extremes were significantly associated with five out of nine oscillation indices, including Atlantic Multidecadal Oscillation (AMO), Arctic Oscillation (AO), East Asian Summer Monsoon Index (EASMI), Sunspot, and South Asian Summer Monsoon Index (SASMI), while cool indices were linked with AMO only. Among the precipitation indices, only CDD was positively related to AO, El Niño Southern Oscillation (ENSO), and Southern Oscillation Index (SOI) and negatively associated with the Pacific Decadal Oscillation (PDO). Analysis of circulation patterns using reanalysis datasets explored that elevated summer geopotential height, no visible anticyclonic center, reduced high cloud cover, and enhanced low cloud covers contributed to increasing hot extremes in Bangladesh. Elsevier B.V. 2021-12-15 Article PeerReviewed Islam, H. M. Touhidul and Islam, Abu Reza Md. Towfiqul and Al-Mahbub, Md. Abdullah and Shahid, Shamsuddin and Tasnuva, Anjum and Kamruzzaman, Mohammad and Hu, Zhenghua and Elbeltagi, Ahmed and Kabir, Mohammad Mahbub and Salam, Mohammed Abdus and Ibrahim, Sobhy M. (2021) Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation. Atmospheric Research, 264 . ISSN 0169-8095 http://dx.doi.org/10.1016/j.atmosres.2021.105840 DOI:10.1016/j.atmosres.2021.105840
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Islam, H. M. Touhidul Islam, Abu Reza Md. Towfiqul Al-Mahbub, Md. Abdullah Shahid, Shamsuddin Tasnuva, Anjum Kamruzzaman, Mohammad Hu, Zhenghua Elbeltagi, Ahmed Kabir, Mohammad Mahbub Salam, Mohammed Abdus Ibrahim, Sobhy M. Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation
description	Spatiotemporal changes in six precipitation and five temperature extreme indices of Bangladesh and their linkage with nine ocean-atmospheric oscillation indices have been evaluated in this study to provide necessary information for adaptation planning and development of early warning systems. Daily maximum and minimum temperatures and precipitation for the period 1980–2017 recorded at 20 stations, homogeneously distributed over the country, were employed for this purpose. Modified Mann-Kendall (MMK) test was used to evaluate trends in weather extremes, and detrended fluctuation analysis (DFA) was employed to anticipate the possible continuation of existing trends in the future. The cross-wavelet transform (CWT) was used to evaluate the linkage of weather extremes with oscillation indices in the time-frequency domain. The results indicate an increase in hot extremes and a decrease in cool indices in Bangladesh. An increase in the continuous dry day (CDD) and one-day maximum precipitation (RX1day) was also observed, indicating gradual drying and more susceptibility to flash floods at the same time. DFA revealed the possible continuation of existing trends in temperature and precipitation indices. Almost all the climatic extreme indices of Bangladesh were found to follow periodic cycles with different frequencies. The hot extremes were significantly associated with five out of nine oscillation indices, including Atlantic Multidecadal Oscillation (AMO), Arctic Oscillation (AO), East Asian Summer Monsoon Index (EASMI), Sunspot, and South Asian Summer Monsoon Index (SASMI), while cool indices were linked with AMO only. Among the precipitation indices, only CDD was positively related to AO, El Niño Southern Oscillation (ENSO), and Southern Oscillation Index (SOI) and negatively associated with the Pacific Decadal Oscillation (PDO). Analysis of circulation patterns using reanalysis datasets explored that elevated summer geopotential height, no visible anticyclonic center, reduced high cloud cover, and enhanced low cloud covers contributed to increasing hot extremes in Bangladesh.
format	Article
author	Islam, H. M. Touhidul Islam, Abu Reza Md. Towfiqul Al-Mahbub, Md. Abdullah Shahid, Shamsuddin Tasnuva, Anjum Kamruzzaman, Mohammad Hu, Zhenghua Elbeltagi, Ahmed Kabir, Mohammad Mahbub Salam, Mohammed Abdus Ibrahim, Sobhy M.
author_facet	Islam, H. M. Touhidul Islam, Abu Reza Md. Towfiqul Al-Mahbub, Md. Abdullah Shahid, Shamsuddin Tasnuva, Anjum Kamruzzaman, Mohammad Hu, Zhenghua Elbeltagi, Ahmed Kabir, Mohammad Mahbub Salam, Mohammed Abdus Ibrahim, Sobhy M.
author_sort	Islam, H. M. Touhidul
title	Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation
title_short	Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation
title_full	Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation
title_fullStr	Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation
title_full_unstemmed	Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation
title_sort	spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation
publisher	Elsevier B.V.
publishDate	2021
url	http://eprints.utm.my/id/eprint/94028/ http://dx.doi.org/10.1016/j.atmosres.2021.105840
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score	13.211869

Spatiotemporal changes and modulations of extreme climatic indices in monsoon-dominated climate region linkage with large-scale atmospheric oscillation

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