气候变化领域集成服务门户(CCPortal): Azimuthal Dependence of GNSS-R Scattering Cross-Section in Hurricanes

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DOI	10.1029/2020JC016167
	Azimuthal Dependence of GNSS-R Scattering Cross-Section in Hurricanes
	Balasubramaniam R.; Ruf C.
发表日期	2020
ISSN	21699275
卷号	125 期号:7
英文摘要	Global Navigation Satellite System-Reflectometry (GNSS-R) measurements of the ocean surface are sensitive to roughness scales ranging from a few cms to several kms. Inside a hurricane the surface roughness changes drastically due to varying sea age and fetch length conditions and complex wave-wave interactions caused by its cyclonic rotation and translational motion. As a result, the relationship between the surface roughness at different scale sizes becomes azimuthally dependent, as does the relationship between scattering cross-section and wind speed as represented by a Geophysical Model Function (GMF). In this work, the impact of this azimuthal variation on the scattering cross-section is assessed. An empirical GMF is constructed using measurements by the NASA CYclone GNSS (CYGNSS) matched to HWRF reanalysis surface winds for 19 hurricanes in 2017 and 2018. The analysis reveals a 2–8% variation in scattering cross-section due to azimuthal location, and the magnitude of the azimuthal dependence is found to grow with wind speed. © 2020. The Authors.
英文关键词	azimuthal dependence; Geophysical Model Function; GNSS-R; hurricanes; radar cross-section; sea state
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186775
作者单位	Climate and Space Science and Engineering Department, University of Michigan, Ann Arbor, MI, United States
推荐引用方式 GB/T 7714	Balasubramaniam R.,Ruf C.. Azimuthal Dependence of GNSS-R Scattering Cross-Section in Hurricanes[J],2020,125(7).
APA	Balasubramaniam R.,&Ruf C..(2020).Azimuthal Dependence of GNSS-R Scattering Cross-Section in Hurricanes.Journal of Geophysical Research: Oceans,125(7).
MLA	Balasubramaniam R.,et al."Azimuthal Dependence of GNSS-R Scattering Cross-Section in Hurricanes".Journal of Geophysical Research: Oceans 125.7(2020).