气候变化领域集成服务门户(CCPortal): Increasing the Space–Time Resolution of Mapped Sea Surface Height From Altimetry

CCPortal

DOI	10.1029/2019JC015878
	Increasing the Space–Time Resolution of Mapped Sea Surface Height From Altimetry
	Archer M.R.; Li Z.; Fu L.-L.
发表日期	2020
ISSN	21699275
卷号	125 期号:6
英文摘要	We present a mapping methodology to improve the resolution of gridded sea surface height (SSH) from multisatellite along-track measurements, and apply it in the California Current system. This is motivated by the upcoming Surface Water and Ocean Topography (SWOT) satellite mission, which will collect novel high-resolution wide-swath SSH measurements. The calibration/validation of SWOT will be in the California Current and requires independent observations of SSH spatial variability. Our objective was to discover how far we could push the space–time resolution of SSH maps based on the existing altimetry constellation. Currently, the best SSH maps for the region are from AVISO's global product based on optimal interpolation (OI). Our methodology is based on 2-D variational analysis (2DVAR), and we address some limitations of the AVISO OI global parameterization that restrict the resolution. Key improvements are (1) use of a background field incorporating mesoscale information, as opposed to a long-term mean field; (2) optimized regional parameters; and (3) a representation error term in the observational error covariance matrix to account for the spread of measurements in time. Using a suite of independent remote and in situ observations, we show the 2DVAR method can produce higher-resolution SSH maps in the California Current region that successfully capture smaller-scale ocean features than AVISO, at the expense of an increase in noise. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	2DVAR variational analysis; altimetry; AVISO DUACS CMEMS SSH; California Current; optimal interpolation; sea surface height maps
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/186847
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Archer M.R.,Li Z.,Fu L.-L.. Increasing the Space–Time Resolution of Mapped Sea Surface Height From Altimetry[J],2020,125(6).
APA	Archer M.R.,Li Z.,&Fu L.-L..(2020).Increasing the Space–Time Resolution of Mapped Sea Surface Height From Altimetry.Journal of Geophysical Research: Oceans,125(6).
MLA	Archer M.R.,et al."Increasing the Space–Time Resolution of Mapped Sea Surface Height From Altimetry".Journal of Geophysical Research: Oceans 125.6(2020).