气候变化领域集成服务门户(CCPortal): Diagnosis of wet and dry events and its associated atmospheric circulation anomaly over Malawi, Southeast Africa

CCPortal

DOI	10.1016/j.dynatmoce.2021.101221
	Diagnosis of wet and dry events and its associated atmospheric circulation anomaly over Malawi, Southeast Africa
	Alexander F.; Nyasulu M.
发表日期	2021
ISSN	03770265
卷号	94
英文摘要	This paper presents an analysis of December to February (DJF) season wet and dry events and their associated circulation anomalies during the period of 1978–2010 over Malawi. The study was conducted using meteorological daily observed rainfall datasets during the entire study period. A set of regional wet and dry indices with a scheme of classifying their severity was employed to classify the wet and dry into seven different grades using the Z-Index. The results reveal severe wet during 1997 and 2007 rainfall season, while extreme dry events were observed in 1992 and 2000 season. The wind components (u;v) and velocity potential/divergence analysis revealed that dry years were characterized by divergence at low level and convergence at upper troposphere, especially over region of study, Mozambique, Madagascar as well as North Madagascar. It was observed that there is a pattern of enhancement for vertical velocity (Omega) and Relative humidity during wet years and reduction during dry years. The SST uncovers dry years were manifested with negative anomalies over equatorial western Indian ocean and the eastern equatorial Pacific Ocean. Wet years were characterized by a pool of positive anomaly over the south west and equatorial of Indian Ocean, and a negative anomaly in the equatorial Pacific Ocean. © 2021 Elsevier B.V.
英文关键词	Circulation anomaly; Dry; Malawi; Wet; Z-index
语种	英语
scopus关键词	Atmospheric humidity; Drought; Rain; Atmospheric circulation anomaly; Circulation anomalies; Eastern equatorial Pacific; Equatorial Pacific Ocean; Upper troposphere; Velocity potentials; Vertical velocity; Western indian oceans; Oceanography; anomaly; atmospheric circulation; dry season; extreme event; rainfall; sea surface temperature; wet season; Malawi
来源期刊	Dynamics of Atmospheres and Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178232
作者单位	Department of Climate Change and Meteorological Services (DCCMS)Malawi, P.O. Box 1808, Blantyre, Malawi; Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change (ILCEC), Nanjing University of Information Science & Technology, Nanjing, 210044, China; School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Alexander F.,Nyasulu M.. Diagnosis of wet and dry events and its associated atmospheric circulation anomaly over Malawi, Southeast Africa[J],2021,94.
APA	Alexander F.,&Nyasulu M..(2021).Diagnosis of wet and dry events and its associated atmospheric circulation anomaly over Malawi, Southeast Africa.Dynamics of Atmospheres and Oceans,94.
MLA	Alexander F.,et al."Diagnosis of wet and dry events and its associated atmospheric circulation anomaly over Malawi, Southeast Africa".Dynamics of Atmospheres and Oceans 94(2021).