Spatiotemporal changes of precipitation extremes in Bangladesh during 1987-2017 and their connections with climate changes, climate oscillations, and monsoon dynamics

被引:25
作者
Ezaz, Gazi Tawfiq [1 ,2 ]
Zhang, Ke [1 ,2 ,3 ,4 ,5 ]
Li, Xin [1 ,2 ]
Shalehy, Md Halim [2 ]
Hossain, Mohammad Akram [6 ]
Liu, Linxin [1 ,2 ]
机构
[1] Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China
[2] Hohai Univ, Coll Hydrol & Water Recourses, Nanjing 210098, Jiangsu, Peoples R China
[3] Hohai Univ, Yangtze Inst Conservat & Dev, Nanjing 210098, Jiangsu, Peoples R China
[4] Hohai Univ, Coll Hydrol & Water Resources, Nanjing 210098, Jiangsu, Peoples R China
[5] Hohai Univ, CMA HHU Joint Lab Hydrometeorol Studies, Nanjing 210098, Jiangsu, Peoples R China
[6] Bangladesh Meteorol Dept, Climate Div, Agargoan 1207, Dhak, Bangladesh
基金
中国国家自然科学基金;
关键词
Precipitation extremes; Trend analysis; Indian Ocean dipole; East Asian summer monsoon; El Nino – Southern oscillation; Global warming; Bangladesh; INDIAN-OCEAN DIPOLE; RAINFALL VARIABILITY; OBSERVED TRENDS; RIVER-BASIN; TEMPERATURE; ENSO; INDEXES; ELEVATION; BENGAL; CHINA;
D O I
10.1016/j.gloplacha.2021.103712
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
This study provides a comprehensive framework to explore the spatiotemporal changes in precipitation extremes in Bangladesh, an important South Asian country, over the 1987-2017 period and their links with climate changes, large-scale climate oscillations (i.e., El Nin similar to o-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD)), and the East Asian Summer Monsoon (EASM) dynamics. Precipitation extremes are measured by ten extreme precipitation indices (EPIs) recommended by the Expert Team on Climate Change Detection and Indices. The comprehensive framework consists of an iterative-based Mann-Kendall trend analysis to explore the trends in the EPIs across the country and a joint analysis based on a Pearson product-moment correlation analysis and a multivariate linear regression to investigate the links of the EPIs with local to global climate changes, ENSO, IOD, and EASM dynamics. This study finds that precipitation extremes show clearly regional and seasonal differential changes across Bangladesh. All of the 28 stations across Bangladesh show positive trends for consecutive dry days, while 21 out of 28 stations show negative trends in annual total wet-day precipitation. Maximum 1-day precipitation amount and 5-day precipitation amount are increasing over the coastal areas during the monsoon season and decreasing in winter for most parts of Bangladesh. The trends of precipitation extremes show a clear spatial dependency on topography and distance from the coastline. Precipitation extremes in Bangladesh appear to respond more actively to IOD, local to global climate changes, and EASM than ENSO, especially for annual total wet-day precipitation, very and extreme wet days, and wet spells. In addition, precipitation extremes in coastal regions are more responsive to global warming than in inland regions. Most of the EPIs show negative associations with local temperature anomalies and the EASM strength. This study provides a new comprehensive look at the important links of extreme precipitations variations with climate changes, largescale climate oscillations, and EASM dynamics across Bangladesh.
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页数:13
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