气候变化领域集成服务门户(CCPortal): An assessment of marine atmospheric boundary layer roll detection using Sentinel-1 SAR data

CCPortal

DOI	10.1016/j.rse.2020.112031
	An assessment of marine atmospheric boundary layer roll detection using Sentinel-1 SAR data
	Wang C.; Vandemark D.; Mouche A.; Chapron B.; Li H.; Foster R.C.
发表日期	2020
ISSN	00344257
卷号	250
英文摘要	The ability of high-resolution synthetic aperture radar (SAR) to detect marine atmospheric boundary layer (MABL) roll-induced roughness modulation of the sea surface wave field is well known. This study presents SAR measurements of MABL rolls using global coverage data collected by the European Space Agency's C-band Sentinel-1A satellite in 2016–2017. An automated classifier is used to identify likely roll events from more than 1.3 million images that were acquired at two incidence angles of 23° and 36.5° in either VV or HH polarization. Characteristics of the detected rolls are examined for different wind speeds, polarizations, incidence and relative azimuth angles. Roll detection counts are much higher at the higher incidence angle and nearly equivalent for VV and HH polarizations. Detection depends strongly on the relative azimuth with roll detection rates at crosswind being 3–10 times lower than for up- or downwind. All data show a low wind speed threshold near 2 m s−1 and that rolls are most commonly observed at wind speeds near 9 m s−1. For all viewing configurations, we find that rolls induce a wide range of mean surface wind speed modulation with the most frequent value being 8% (±3.5%). Roll detection at crosswind is associated with stronger roll-induced surface wind enhancement. Dependencies of roll detection on the incidence and relative azimuth angles are consistent with rapid short-scale wind-wave adjustments to the roll-induced surface wind gusts. These cm-scale waves are highly directional and provide limited crosswind backscatter at shallower incidence angles. The same roll-induced surface forcing is thus not equally detectable at all viewing geometries or polarizaions. Stronger and possibly longer-duration wind forcing is likely needed to produce detectable roll-induced modulations at crosswind. © 2020 Elsevier Inc.
英文关键词	Imaging sensitivity; Marine atmospheric boundary layer rolls; Sentinel-1 wave mode; Surface wind perturbation; Synthetic aperture radar (SAR)
语种	英语
scopus关键词	Marine radar; Modulation; Polarization; Space-based radar; Surface waters; Surface waves; Synthetic aperture radar; Wind; Automated classifiers; European Space Agency; High resolution synthetic aperture radar; Incidence angles; Marine atmospheric boundary layer; Relative azimuth angle; Sea surface waves; Surface wind speed; Atmospheric boundary layer; azimuth; boundary layer; detection method; marine environment; polarization; satellite data; Sentinel; synthetic aperture radar; wind velocity; wind wave
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179153
作者单位	IFREMER, Univ. Brest, CNRS, IRD, Laboratoire d'Oceanographie Physique et Spatiale (LOPS), Brest, France; IMT Atlantique, Lab-STICC, UBL, Brest, France; Ocean Processes Analysis Laboratory, University of New Hampshire, Durham, NH, United States; School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China; Applied Physics Laboratory, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Wang C.,Vandemark D.,Mouche A.,et al. An assessment of marine atmospheric boundary layer roll detection using Sentinel-1 SAR data[J],2020,250.
APA	Wang C.,Vandemark D.,Mouche A.,Chapron B.,Li H.,&Foster R.C..(2020).An assessment of marine atmospheric boundary layer roll detection using Sentinel-1 SAR data.Remote Sensing of Environment,250.
MLA	Wang C.,et al."An assessment of marine atmospheric boundary layer roll detection using Sentinel-1 SAR data".Remote Sensing of Environment 250(2020).