气候变化领域集成服务门户(CCPortal): Satellite-Derived Characteristics of Saharan Cold Pool Outflows During Boreal Summer

CCPortal

DOI	10.1029/2020JD033387
	Satellite-Derived Characteristics of Saharan Cold Pool Outflows During Boreal Summer
	Caton Harrison T.; Washington R.; Engelstaedter S.
发表日期	2021
ISSN	2169897X
卷号	126 期号:3
英文摘要	Cold pool outflows (CPOs) are thought to be the most significant meteorological mechanism of mineral dust emission from the world's largest source in the central and western Sahara in boreal summer. An absence of CPOs from numerical models and reanalyses used to simulate Saharan dust emission leads to considerable error in modeling of dust fluxes from the Sahara. As such, the role of CPOs in the observed variability of dust through the monsoon season remains unclear. To remedy these issues, an improved observational benchmark is needed. In this research, an automated approach to identify and track CPOs in dust imagery from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) is derived. The approach is found to flag 74.2% of events identified manually (26/35). 1,559 events are tracked for June, July and August of 2004–2017. CPOs follow a clear diurnal cycle, peaking at 1700–1900 Universal Time Coordinated. Propagation speeds decay exponentially through their lifetime, but on average speeds are 1.5 ms−1 higher at night. About 22.5% of the observed events exceed a total traveled distance of 300 km, with an overwhelming preference for northwestwards propagation. Common across the southern central and western Sahara, CPO activity shifts north through summer in line with observed dust emission. The exception to this is the development of an intense hotspot of CPO activity in southern Algeria in August, which does not parallel any known late season outbreaks of dust. The results underline the importance of the southernmost Saharan dust sources, activated by frequent CPO occurrence in early summer. © 2021. The Authors.
英文关键词	cold pool outflow; density current; haboob; mineral dust; remote sensing; Sahara
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185510
作者单位	Climate Research Laboratory, Oxford University Centre for the Environment, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Caton Harrison T.,Washington R.,Engelstaedter S.. Satellite-Derived Characteristics of Saharan Cold Pool Outflows During Boreal Summer[J],2021,126(3).
APA	Caton Harrison T.,Washington R.,&Engelstaedter S..(2021).Satellite-Derived Characteristics of Saharan Cold Pool Outflows During Boreal Summer.Journal of Geophysical Research: Atmospheres,126(3).
MLA	Caton Harrison T.,et al."Satellite-Derived Characteristics of Saharan Cold Pool Outflows During Boreal Summer".Journal of Geophysical Research: Atmospheres 126.3(2021).