气候变化领域集成服务门户(CCPortal): Monitoring Intense Oceanic Fronts Using Sea Surface Roughness: Satellite, Airplane, and In Situ Comparison

CCPortal

DOI	10.1029/2019JC015704
	Monitoring Intense Oceanic Fronts Using Sea Surface Roughness: Satellite, Airplane, and In Situ Comparison
	Rascle N.; Chapron B.; Molemaker J.; Nouguier F.; Ocampo-Torres F.J.; Osuna Cañedo J.P.; Marié L.; Lund B.; Horstmann J.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	Sea surface roughness is affected by surface current gradients, which provides a means of monitoring from satellite sharp oceanic fronts. This paper is the second report of an experiment designed to compare observations of sea surface roughness and surface currents at an unprecedented accuracy, owing to the conjunction of numerous deployed drifters and roughness instruments. About 200 drifters sampled a thin 10 km elongated submesoscale front, also monitored by a high density of roughness instruments: satellite synthetic aperture radar, satellite, and airborne multiangle sunglint radiometers. The first paper focused on the retrieval of the current gradient direction (convergence and cyclonic vorticity) at the front, using roughness observations at multiple angle from airplane. This second paper focuses on the retrieval of the current gradient magnitude and scale, using roughness observations at different scales, from airplane and from satellite. Two main results are obtained: (i) Trajectories of selected drifters show that the front is only 50 m wide and unambiguously exhibits convergence and cyclonic vorticity up to 100f (with f the Coriolis frequency). This far exceeds previously documented values for submesoscale deep ocean fronts. (ii) Correct estimation of such extreme current gradients using surface roughness hinges on instruments with sufficiently high spatial resolution. Lower-resolution roughness sensors can still detect the front, as demonstrated from observations and a simplified model, but cannot properly estimate the current gradient magnitude and the frontal width. Those results provide guidelines for monitoring intense current gradients from space using sea surface roughness. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	fine-scale current; ocean front; sea surface roughness; submesoscale current; sunglint Sun glitter; synthetic aperture radar (SAR)
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/186747
作者单位	Departamento de Oceanografía Física, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Mexico; Université de Bretagne Occidentale, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France; Department of Atmospheric and Oceanic Sciences, University of California Los Angeles, Los Angeles, CA, United States; Department of Ocean Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Department of Radar Hydrography, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
推荐引用方式 GB/T 7714	Rascle N.,Chapron B.,Molemaker J.,et al. Monitoring Intense Oceanic Fronts Using Sea Surface Roughness: Satellite, Airplane, and In Situ Comparison[J],2020,125(8).
APA	Rascle N..,Chapron B..,Molemaker J..,Nouguier F..,Ocampo-Torres F.J..,...&Horstmann J..(2020).Monitoring Intense Oceanic Fronts Using Sea Surface Roughness: Satellite, Airplane, and In Situ Comparison.Journal of Geophysical Research: Oceans,125(8).
MLA	Rascle N.,et al."Monitoring Intense Oceanic Fronts Using Sea Surface Roughness: Satellite, Airplane, and In Situ Comparison".Journal of Geophysical Research: Oceans 125.8(2020).