气候变化领域集成服务门户(CCPortal): Causes of the upper-level warm temperature anomaly (UWTA) associated with March

CCPortal

DOI	10.1016/j.atmosres.2020.105016
	Causes of the upper-level warm temperature anomaly (UWTA) associated with March–May heavy rainfall in Tanzania
	Mafuru K.B.; Guirong T.
发表日期	2020
ISSN	0169-8095
卷号	242
英文摘要	This study diagnoses the cause of the upper-level warm temperature anomaly (UWTA) associated with March–May (MAM) heavy rainfall of 1980–2010 in Tanzania in terms of the empirical orthogonal function (EOF), singular value decomposition (SVD) and dynamical diagnosis. EOF reveals the dominance of enhanced UWTA over the entire study region with strong warming to the northern coast, central, south-western highlands (SWH) and western part of the country. SVD depicts a monopole positive co-variability between the UWTA of the entire study area and SSTA over the entire domain of the Indian Ocean with strong positive coefficients to the central equatorial and western Indian Ocean (WIO). The lead-lag correlation coefficients between the three months running mean for the normalized WIO SSTA and UWTA indices show that, the UWTA formation starts early before MAM with the highest peak in February–April (FMA). The ascending branch of the Walker circulation is the dominant primer for the vertical uplift of warm moist air from the WIO during MAM while convective coupled Kelvin waves (CCKWs) dominate in FMA season. In both seasons, strong positive zonal temperature advection anomalies over the WIO spread towards the study area thereby dominating diabatic cooling and further increase the upper-level tropospheric temperature. Thus, diabatic heating due to enhanced uplift of warm and moist air from enhanced warm SSTA of the WIO warms the upper-level troposphere (i.e., also the UWTA) of the study area through the zonal temperature advection. © 2020 Elsevier B.V.
英文关键词	Convective coupled Kelvin waves; Heavy rainfall; Sea surface temperature; Upper-level warm temperature anomaly; Walker circulation
语种	英语
scopus关键词	Advection; Orthogonal functions; Rain; Troposphere; Correlation coefficient; Diabatic heating; Empirical Orthogonal Function; Positive coefficients; Tropospheric temperature; Walker circulation; Warm temperatures; Western indian oceans; Singular value decomposition; correlation; empirical orthogonal function analysis; Kelvin wave; rainfall; sea surface temperature; singular value decomposition; temperature anomaly; temperature profile; troposphere; Walker circulation; Indian Ocean; Tanzania
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/141899
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Joint International Research Laboratory of Climate and Environment Change (ILCBC), Collaborative Disasters (CIC-FEMD), Nanjing, 210044, China; College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044, China; Tanzania Meteorological Authority, Dar es Salaam, Tanzania
推荐引用方式 GB/T 7714	Mafuru K.B.,Guirong T.. Causes of the upper-level warm temperature anomaly (UWTA) associated with March–May heavy rainfall in Tanzania[J],2020,242.
APA	Mafuru K.B.,&Guirong T..(2020).Causes of the upper-level warm temperature anomaly (UWTA) associated with March–May heavy rainfall in Tanzania.Atmospheric Research,242.
MLA	Mafuru K.B.,et al."Causes of the upper-level warm temperature anomaly (UWTA) associated with March–May heavy rainfall in Tanzania".Atmospheric Research 242(2020).