气候变化领域集成服务门户(CCPortal): Variability in the Mozambique channel trough and impacts on Southeast African rainfall

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DOI	10.1175/JCLI-D-19-0267.1
	Variability in the Mozambique channel trough and impacts on Southeast African rainfall
	Barimalala R.; Blamey R.C.; Desbiolles F.; Reason C.J.C.
发表日期	2020
ISSN	0894-8755
起始页码	749
结束页码	765
卷号	33 期号:2
英文摘要	The Mozambique Channel trough (MCT) is a cyclonic region prominent in austral summer in the central and southern Mozambique Channel. It first becomes evident in December with a peak in strength in February when the Mozambique Channel is warmest and the Mascarene high (MH) is located farthest southeast in the Indian Ocean basin. The strength and the timing of the mean MCT are linked to that of the cross-equatorial northeasterly monsoon in the tropical western Indian Ocean, which curves as northwesterlies toward northern Madagascar. The interannual variability in the MCT is associated with moist convection over the Mozambique Channel and is modulated by the location of the warm sea surface temperatures in the south Indian Ocean. Variability of the MCT shows a strong relationship with the equatorial westerlies north of Madagascar and the latitudinal extension of the MH. Summers with strong MCT activity are characterized by a prominent cyclonic circulation over the Mozambique Channel, extending to the midlatitudes. These are favorable for the development of tropical-extratropical cloud bands over the southwestern Indian Ocean and trigger an increase in rainfall over the ocean but a decrease over the southern African mainland. Most years with a weak MCT are associated with strong positive south Indian Ocean subtropical dipole events, during which the subcontinent tends to receive more rainfall whereas Madagascar and northern Mozambique are anomalously dry. © 2019 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Rain; Surface waters; Tropics; Cyclonic circulation; Cyclonic regions; Interannual variability; Moist convection; Mozambique channels; South Indian Ocean; Southern Mozambique; Western indian oceans; Oceanography; annual variation; climate effect; convection; rainfall; sea surface temperature; trough; westerly; Indian Ocean; Indian Ocean (South); Indian Ocean (West); Mozambique Channel
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171493
作者单位	Department of Oceanography, University of Cape Town, Rondebosch, South Africa
推荐引用方式 GB/T 7714	Barimalala R.,Blamey R.C.,Desbiolles F.,et al. Variability in the Mozambique channel trough and impacts on Southeast African rainfall[J],2020,33(2).
APA	Barimalala R.,Blamey R.C.,Desbiolles F.,&Reason C.J.C..(2020).Variability in the Mozambique channel trough and impacts on Southeast African rainfall.Journal of Climate,33(2).
MLA	Barimalala R.,et al."Variability in the Mozambique channel trough and impacts on Southeast African rainfall".Journal of Climate 33.2(2020).