Sea-Level Fingerprints Due to Present-Day Water Mass Redistribution in Observed Sea-Level Data

Remote Sensing

Jianli Chen¹  Anny Cazenave²  Lorena Moreira²  Anne Barnoud³ 

[1] Center for Space Research, University of Texas at Austin, Austin, TX 78759-5321, USA;International Space Science Institute (ISSI), 3012 Bern, Switzerland;Magellium, 31520 Ramonville-Saint-Agne, France;

关键词: sea level;    altimetry;    steric sea-level;    GRACE;    fingerprints;   

DOI  :  10.3390/rs13224667

来源: DOAJ

【 摘 要 】

Satellite altimetry over the oceans shows that the rate of sea-level rise is far from uniform, with reported regional rates up to two to three times the global mean rate of rise of ~3.3 mm/year during the altimeter era. The mechanisms causing the regional variations in sea-level trends are dominated by ocean temperature and salinity changes, and other processes such as ocean mass redistribution as well as solid Earth’s deformations and gravitational changes in response to past and ongoing mass redistributions caused by land ice melt and terrestrial water storage changes (respectively known as Glacial Isostatic Adjustment (GIA) and sea-level fingerprints). Here, we attempt to detect the spatial trend patterns of the fingerprints associated with present-day land ice melt and terrestrial water mass changes, using satellite altimetry-based sea-level grids corrected for the steric component. Although the signal-to-noise ratio is still very low, a statistically significant correlation between altimetry-based sea-level and modelled fingerprints is detected in some ocean regions. We also examine spatial trend patterns in observed GRACE ocean mass corrected for atmospheric and oceanic loading and find that some oceanic regions are dominated by the fingerprints of present-day water mass redistribution.

【 授权许可】

Unknown