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DOI	10.1175/JCLI-D-19-0854.1
	When does the saharan air layer impede the intensification of tropical cyclones?
	Huang W.T.K.; Schnadt Poberaj C.; Enz B.; Horat C.; Lohmann U.
发表日期	2020
ISSN	0894-8755
起始页码	10609
结束页码	10626
卷号	33 期号:24
英文摘要	We investigate the circumstances under which the Saharan air layer (SAL) has a negative impact on the intensification of tropical cyclones (TCs) over the North Atlantic Ocean. Using hurricane tracking, aerosol optical depth (AOD) data, and meteorological analyses, we analyze the interaction of the SAL with 52 named TCs that formed over the east and central Atlantic south of the Cape Verde islands between 2004 and 2017. Following the categorization of negative SAL influences on TC intensification by Dunion and Velden, only 21% of the investigated storms can be classified (28% of all storms that encountered the SAL), and 21% of the storms continue to intensify despite the presence of the SAL. We show that among TCs that encounter the SAL, there is evidence supporting a weak negative correlation between the magnitude of TC intensification and the ambient AOD. However, above-average Saharan dust abundance in the vicinity of TCs is not a good independent indicator for storm nonintensification. To better understand the specific processes involved, a composite study is carried out, contrasting storms that intensify in the presence of the SAL against those that do not.Wefind that sheared air masses on the north side and drier air from the northeast of the storm early on during its lifetime, in addition to higher AOD, are associated with TC nonintensification in proximity to the SAL. © 2020 American Meteorological Society.
英文关键词	Hurricanes; Tropics; Aerosol optical depths; Central Atlantic; Meteorological analysis; Negative correlation; North Atlantic Ocean; Saharan air layers; Saharan dust; Tropical cyclone; Storms; aerosol; air mass; dust; dust storm; humidity; hurricane; optical depth; tropical cyclone; wind shear; Atlantic Ocean; Atlantic Ocean (North); Cape Verde [Macaronesia]; Sahara; Indicator indicator
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/171029
作者单位	Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland; Center for Climate System Modeling, ETH Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Huang W.T.K.,Schnadt Poberaj C.,Enz B.,et al. When does the saharan air layer impede the intensification of tropical cyclones?[J],2020,33(24).
APA	Huang W.T.K.,Schnadt Poberaj C.,Enz B.,Horat C.,&Lohmann U..(2020).When does the saharan air layer impede the intensification of tropical cyclones?.Journal of Climate,33(24).
MLA	Huang W.T.K.,et al."When does the saharan air layer impede the intensification of tropical cyclones?".Journal of Climate 33.24(2020).