气候变化领域集成服务门户(CCPortal): Identifying and Characterizing Tropical Oceanic Mesoscale Cold Pools using Spaceborne Scatterometer Winds

CCPortal

DOI	10.1029/2019JD031812
	Identifying and Characterizing Tropical Oceanic Mesoscale Cold Pools using Spaceborne Scatterometer Winds
	Garg P.; Nesbitt S.W.; Lang T.J.; Priftis G.; Chronis T.; Thayer J.D.; Hence D.A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:5
英文摘要	Convective cold pools over oceans contribute to the air-sea exchange of heat and moisture. Beyond cold pools' physical properties, cold pools and their intersections are important mechanisms controlling the life cycle of tropical convective systems. However, few observational techniques are available to routinely observe the properties of cold pools and their association with convection. The primary goal of this study is to demonstrate a new technique using gradients in remotely sensed ocean vector winds as a proxy for the structure and characteristics of tropical oceanic cold pools. Using Advanced Scatterometer (ASCAT) vector wind retrievals with field of view of 12.5 km, regions of enhanced gradients in surface winds are identified as gradient features. A 3-km Weather Research and Forecasting (WRF) model simulation was carried out to illustrate the technique over the Indian Ocean during the 2011 DYNAmics of Madden-Julian Oscillation (DYNAMO) field campaign. A forward operator was applied to the model wind fields, allowing direct comparisons of wind gradients and virtual temperature-defined cold pool thermodynamic and kinematic properties. In situ buoy measurements of air temperature were also used to validate ASCAT-identified cold pools. Quantitative skill metrics demonstrate that the technique has a low false alarm rate (<10%), high critical success index (>85%), and a low bias (~1). The gradient feature technique was then applied to ASCAT-retrieved ocean vector winds, revealing global variations in cold pool properties. These properties are shown to be related to the properties of global convective systems observed by the Tropical Rainfall Measurement Mission (TRMM). ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	buoy; cold pools; convection; precipitation; scatterometer; tropical ocean
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/186125
作者单位	Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States; NASA Marshall Space Flight Center, Huntsville, AL, United States; Department of Atmospheric and Earth Science, University of Alabama in Huntsville, Huntsville, AL, United States
推荐引用方式 GB/T 7714	Garg P.,Nesbitt S.W.,Lang T.J.,et al. Identifying and Characterizing Tropical Oceanic Mesoscale Cold Pools using Spaceborne Scatterometer Winds[J],2020,125(5).
APA	Garg P..,Nesbitt S.W..,Lang T.J..,Priftis G..,Chronis T..,...&Hence D.A..(2020).Identifying and Characterizing Tropical Oceanic Mesoscale Cold Pools using Spaceborne Scatterometer Winds.Journal of Geophysical Research: Atmospheres,125(5).
MLA	Garg P.,et al."Identifying and Characterizing Tropical Oceanic Mesoscale Cold Pools using Spaceborne Scatterometer Winds".Journal of Geophysical Research: Atmospheres 125.5(2020).