气候变化领域集成服务门户(CCPortal): Marine X-Band Radar Currents and Bathymetry: An Argument for a Wave Number-Dependent Retrieval Method

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DOI	10.1029/2019JC015618
	Marine X-Band Radar Currents and Bathymetry: An Argument for a Wave Number-Dependent Retrieval Method
	Lund B.; Haus B.K.; Graber H.C.; Horstmann J.; Carrasco R.; Novelli G.; Guigand C.M.; Mehta S.; Laxague N.J.M.; Özgökmen T.M.
发表日期	2020
ISSN	21699275
卷号	125 期号:2
英文摘要	This study evaluates shipboard marine X-band radar (MR) near-surface current and bathymetry measurements under shallow water conditions. The retrieval algorithm is based on the surface wave signal within three-dimensional wave number frequency MR backscatter intensity variance spectra. The MR data were collected during a research cruise that investigated submesoscale processes and their impact on oil spill transport in the Louisiana Bight. The MR currents and bathymetry are validated using measurements from 500 GPS-equipped surface drifters, a shipboard acoustic Doppler current profiler, and a shipboard single-beam echo sounder. Earlier results from the same experiment but using a different set of sensors indicate strong upper ocean vertical current shear over a 3.5 hr period, despite only mild wind forcing. Here, the MR currents are derived as a function of wave number, providing a measure of vertical shear for the full duration of the cruise. Strong vertical shear is frequently observed, with a maximum difference of 0.42 m/s between the MR high (effective depth of ~0.9 m) and low (~2.4 m) wave number bins. Treating the drifter and echo sounder measurements as truth, the accuracies of the MR near-surface currents and bathymetry are 0.04–0.07 m/s and 1.2 m (or 7% of the mean water depth). However, it is shown that ~50% of the MR high wave number and drifter current differences is due to vertical shear. The shallow water MR near-surface current accuracy thus matches findings from a previous deep water validation where vertical shear was much weaker. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	bathymetry retrieval; current retrieval; shipboard marine X-band radar; surface gravity waves; upper-ocean vertical current shear; validation
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/187006
作者单位	Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Helmholtz-Zentrum Geesthacht, Geesthacht, Germany; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
推荐引用方式 GB/T 7714	Lund B.,Haus B.K.,Graber H.C.,et al. Marine X-Band Radar Currents and Bathymetry: An Argument for a Wave Number-Dependent Retrieval Method[J],2020,125(2).
APA	Lund B..,Haus B.K..,Graber H.C..,Horstmann J..,Carrasco R..,...&Özgökmen T.M..(2020).Marine X-Band Radar Currents and Bathymetry: An Argument for a Wave Number-Dependent Retrieval Method.Journal of Geophysical Research: Oceans,125(2).
MLA	Lund B.,et al."Marine X-Band Radar Currents and Bathymetry: An Argument for a Wave Number-Dependent Retrieval Method".Journal of Geophysical Research: Oceans 125.2(2020).