气候变化领域集成服务门户(CCPortal): Precipitation over semi-arid regions of North Hemisphere affected by Atlantic Multidecadal Oscillation

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DOI	10.1016/j.atmosres.2021.105801
	Precipitation over semi-arid regions of North Hemisphere affected by Atlantic Multidecadal Oscillation
	Zhu K.; Guan X.; Huang J.; Wang J.; Guo S.; Cao C.
发表日期	2021
ISSN	0169-8095
卷号	262
英文摘要	As a key variable in climate change over semi-arid regions, precipitation variation has received much attention from the public, but the local mechanisms involved are still not fully understood. The results presented in this study show as the Atlantic Multidecadal Oscillation (AMO) underwent a phase transition from the negative to a positive phase in the past 30 years, precipitation over the areas with annual precipitation below 400 mm decreased, while the areas with annual precipitation of more than 400 mm showed an increase of precipitation in the semi-arid regions. In the past two whole cycles of the AMO, during the positive phase, less precipitation was distributed in the semi-arid regions of North America, more precipitation in the semi-arid regions of North Africa, Iberian Peninsula, Asia Minor Peninsula, and India, while opposite change pattern was observed in the negative phase. Such precipitation patterns which depend on AMO are associated with the North Atlantic SST anomalies. In the positive phase of AMO, the elevated SST weakened the summer sea-level pressure over the Atlantic. Then, three cyclonic circulation anomalies appear over North Atlantic, North America, and eastern Pacific. The cyclonic circulation anomalies intersected over the semi-arid regions of North America and caused anomalous low-level divergence and the North Atlantic cyclonic circulation enhanced the African monsoon, even affecting the precipitation in the semi-arid regions around the Atlantic. In the negative phase, a roughly opposite flow field occurred. Besides, according to the prediction of the E3SM 1–1 model, the negative AMO will appear in the coming decade, the same AMO which contributed to the increased semi-arid precipitation over southern part of North America and the decreased semi-arid precipitation over North Africa. © 2021 Elsevier B.V.
英文关键词	Atlantic Multidecadal Oscillation; Decadal variability; Dynamic mechanism; Precipitation; Semi-arid regions
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236617
作者单位	Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; Collaborative Innovation Center for Western Ecological Safety, Lanzhou, China
推荐引用方式 GB/T 7714	Zhu K.,Guan X.,Huang J.,et al. Precipitation over semi-arid regions of North Hemisphere affected by Atlantic Multidecadal Oscillation[J],2021,262.
APA	Zhu K.,Guan X.,Huang J.,Wang J.,Guo S.,&Cao C..(2021).Precipitation over semi-arid regions of North Hemisphere affected by Atlantic Multidecadal Oscillation.Atmospheric Research,262.
MLA	Zhu K.,et al."Precipitation over semi-arid regions of North Hemisphere affected by Atlantic Multidecadal Oscillation".Atmospheric Research 262(2021).