Inversion of global sea level change and its component contributions by combining time-varying gravity data and altimetry data

doi:10.11947/j.AGCS.2022.20210169

Abstract

Abstract: Understanding sea level change is of paramount importance,it indirectly reflects the changes of climate-related factors in earth system.Based on a set of sea level fingerprints and steric empirical orthogonal functions,a joint inversion is applied by combining time-varying gravity data and satellite altimetry data to derive global sea level change from April 2002 to February 2020.In this research,global sea level change was divided into the contributions of polar ice sheets melting,terrestrial glaciers melting,terrestrial water storage change,glacial isostatic adjustment and steric effect.Joint inversion result shows that global mean steric sea level change is 1.08±0.05 mm/a,which is consistent with the results of relevant literature.It was found that the joint inversion which combined altimetry and time-varying gravity data could reduce the underestimation of global mean ocean mass change during GRACE Follow-On period.Regional sea level changes were investigated by joint inversion,in most coastal areas,inversion results are good of quality,which shows that this method can be used to study regional sea level change.

Key words: global sea level change, sea level fingerprint, steric sea level change, joint inversion, time-varying gravity, satellite altimetry

CLC Number:

P227

LI Yang, GUO Jinyun, SUN Yu, YUAN Jiajia, CHANG Xiaotao, ZHANG Hongri. Inversion of global sea level change and its component contributions by combining time-varying gravity data and altimetry data[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(8): 1768-1778.

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