GRACE卫星重力测量观测到的全球海平面变化特征。

Global sea level change signatures observed by GRACE satellite gravimetry.

作者信息

Jeon Taehwan, Seo Ki-Weon, Youm Kookhyoun, Chen Jianli, Wilson Clark R

机构信息

Department of Earth Science Education, Seoul National University, Seoul, 08826, Republic of Korea.

Center for Space Research, University of Texas at Austin, Austin, Texas, 78759, USA.

出版信息

Sci Rep. 2018 Sep 10;8(1):13519. doi: 10.1038/s41598-018-31972-8.

DOI:10.1038/s41598-018-31972-8

PMID:30202083

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6131218/

Abstract

Ice mass loss on land results in sea level rise, but its rate varies regionally due to gravitational self-attraction effects. Observing regional sea level rates by ocean mass change using the Gravity Recovery and Climate Experiment (GRACE) gravity solutions is difficult due to GRACE's spatial resolution (~a few hundred km) and other limitations. Here we estimate regional sea level mass change using GRACE data (without contributions from temperature and salinity variations) by addressing these limitations: restoring spatially spread and attenuated signals in post-processed GRACE data; constraining ocean mass distribution to conform to the changing geoid; and judging specific corrections applied to GRACE data including a new geocenter estimate. The estimated global sea level mass trend for 2003-2014 is 2.14 ± 0.12 mm/yr. Regional trends differ considerably among ocean basins, ranging from -0.5 mm/yr in the Arctic to about 2.4 mm/yr in the Indian and South Atlantic Oceans.

摘要

陆地冰体流失导致海平面上升，但其速率因引力自吸引效应而存在区域差异。利用重力恢复与气候实验（GRACE）重力解通过海洋质量变化来观测区域海平面变化速率存在困难，这是由于GRACE的空间分辨率（约几百千米）以及其他限制因素。在此，我们通过解决以下这些限制因素，利用GRACE数据（不包括温度和盐度变化的影响）来估算区域海平面质量变化：恢复后处理GRACE数据中空间扩展和衰减的信号；约束海洋质量分布以符合不断变化的大地水准面；以及判断应用于GRACE数据的特定校正，包括一个新的地球质心估计值。2003 - 2014年估计的全球海平面质量趋势为2.14±0.12毫米/年。不同大洋盆地的区域趋势差异显著，从北极的-0.5毫米/年到印度洋和南大西洋的约2.4毫米/年不等。