气候变化领域集成服务门户(CCPortal): Revisiting the strong and weak ENSO teleconnection impacts using a high-resolution atmospheric model

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DOI	10.1016/j.atmosenv.2021.118866
	Revisiting the strong and weak ENSO teleconnection impacts using a high-resolution atmospheric model
	Dogar M.M.A.; Almazroui M.
发表日期	2021
ISSN	1352-2310
英文摘要	To evaluate the performance of a high-resolution atmospheric model (HiRAM) and to improve our understanding of the climatic impacts of ENSO forcing and associated teleconnections, we analyzed AMIP-style HiRAM simulations conducted effectively at 25 km grid spacing. To better assess HiRAM response to ENSO climate variability; we categorized it into strong and weak El Niño/La Niña episodes. The HiRAM model reproduced the impacts of strong ENSO over global scale very well, however, it underestimated ENSO teleconnection patterns and associated changes over regional scale (e.g., MENA and South Asia), especially following weak ENSO that could be attributed to model weak response to circulation changes such as Pacific North American (PNA) and North Atlantic Oscillation (NAO). Moreover, our results emphasize that ENSO impacts are relatively stronger over the Inter-Tropical Convergence Zone (ITCZ) compared to extra-tropics and high-latitude regions. The positive phase of ENSO causes weakening in rainfall over the African tropical rain-belt, parts of South and Southeast Asia. Both the reanalysis and HiRAM results reveal that ENSO-induced negative (positive) NAO-like response and associated changes over Southern Europe and North Africa vary significantly following the increased intensity of El Niño (La Niña). We further found that the ENSO magnitude significantly impacts Hadley and Walker circulations. The El Niño phase of ENSO overall strengthens the Hadley Cell, and the reverse is true for the La Niña phase. This ENSO-induced strengthening and weakening of Hadley Cell induce significant impact over South Asian and African convective regions through modification of the ITCZ circulation system. © 2021 Elsevier Ltd
关键词	El Nino/La Nina ENSO Hadley circulation ITCZ MENA Monsoon system NAO
语种	英语
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248778
作者单位	Global Change Impact Studies Centre, Ministry of Climate Change, Islamabad, Pakistan; JSPS Fellow, Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan; Center of Excellence for Climate Change Research/Department of Meteorology, King Abdulaziz University, Jeddah, Saudi Arabia; Climate Research Unit, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, China
推荐引用方式 GB/T 7714	Dogar M.M.A.,Almazroui M.. Revisiting the strong and weak ENSO teleconnection impacts using a high-resolution atmospheric model[J],2021.
APA	Dogar M.M.A.,&Almazroui M..(2021).Revisiting the strong and weak ENSO teleconnection impacts using a high-resolution atmospheric model.ATMOSPHERIC ENVIRONMENT.
MLA	Dogar M.M.A.,et al."Revisiting the strong and weak ENSO teleconnection impacts using a high-resolution atmospheric model".ATMOSPHERIC ENVIRONMENT (2021).