气候变化领域集成服务门户(CCPortal): Temporal Variations of the Marine Geoid

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DOI	10.1029/2020JC016433
	Temporal Variations of the Marine Geoid
	Siegismund F.; Köhl A.; Rummel R.; Stammer D.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	The effects of temporal changes in the marine geoid on estimates of the ocean dynamic topography are being investigated. Influences from mass redistribution due to changes of land hydrology, ice sheets, glacial isostatic adjustment (GIA), and ocean and atmospheric dynamics are considered, and the associated crustal deformation is included. The strongest signals are associated with the seasonal cycle caused by changes in terrestrial water storage and ice sheets as well as the redistribution of atmospheric mass. Second to this is the importance of an overall trend caused by GIA and decreasing ice sheets over Greenland and Antarctica. On long spatial scales, the amplitude of regional trends estimated for the geoid height has a sizable fraction of those from sea level anomaly (SLA) for the period 1993–2016, also after subtraction of steric height of the upper 1,000 m to analyze trends in deep ocean geostrophic currents. The estimated strong negative geoid height trend south of Greenland for the period 1993–2016 opposes changes in dynamic sea level for the same period thereby affecting past studies on changes of both the strength of the subpolar gyre based on SLA and the meridional overturning circulation on a section between Cape Farewell and Portugal applying ocean dynamic topography and hydrography. We conclude that temporal geoid height trends should be considered in studies of (multi)decadal trends in sea level and circulation on large spatial scales based on altimetry data referenced to a geoid field. © 2020. The Authors.
英文关键词	altimetry; geoid height; ocean dynamic topography; temporal variability; trend
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/186579
作者单位	Institute of Oceanography, Center for Earth System Research and Sustainability, University of Hamburg, Hamburg, Germany; Institute for Astronomical and Physical Geodesy, Technical University of Munich, Munich, Germany
推荐引用方式 GB/T 7714	Siegismund F.,Köhl A.,Rummel R.,et al. Temporal Variations of the Marine Geoid[J],2020,125(11).
APA	Siegismund F.,Köhl A.,Rummel R.,&Stammer D..(2020).Temporal Variations of the Marine Geoid.Journal of Geophysical Research: Oceans,125(11).
MLA	Siegismund F.,et al."Temporal Variations of the Marine Geoid".Journal of Geophysical Research: Oceans 125.11(2020).