Land water and glaciers contributions to global sea level change from satellite gravity measurements

Feng Guiping; Song Qingtao; Jiang Xingwei; Chang Liang

doi:10.3969/j.issn.0253-4193.2018.11.009

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Feng Guiping, Song Qingtao, Jiang Xingwei, Chang Liang. Land water and glaciers contributions to global sea level change from satellite gravity measurements[J]. Haiyang Xuebao, 2018, 40(11): 85-95. doi: 10.3969/j.issn.0253-4193.2018.11.009

Citation:

Feng Guiping, Song Qingtao, Jiang Xingwei, Chang Liang. Land water and glaciers contributions to global sea level change from satellite gravity measurements[J]. Haiyang Xuebao, 2018, 40(11): 85-95. doi: 10.3969/j.issn.0253-4193.2018.11.009

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Land water and glaciers contributions to global sea level change from satellite gravity measurements

doi: 10.3969/j.issn.0253-4193.2018.11.009

1.
National Satellite Ocean Application Service, Beijing 100081, China;Key Laboratory of Ocean Space Remote Sensing and Application, State Oceanic Administration, Beijing 100081, China;Center for Earth System Science, Tsinghua University, Beijing 10084, China;Shanghai Ocean University College of Marine Sciences, Shanghai 201306, China
2.
National Satellite Ocean Application Service, Beijing 100081, China;Key Laboratory of Ocean Space Remote Sensing and Application, State Oceanic Administration, Beijing 100081, China
3.
Shanghai Ocean University College of Marine Sciences, Shanghai 201306, China

Received Date: 2018-02-15
Rev Recd Date: 2018-05-19

Abstract

Abstract

The Gravity Recovery and Climate Experiment (GRACE) satellite mission launched in 2002 provided an opportunity to estimate the global land and ocean water mass variations with high temporal-spatial resolution. In this paper, we use the GRACE RL05 data from January 2003 to December 2014 to estimate the ocean mass variations. We applied 500 km Gaussian smoothing, a decorrelation filtering and a forward modelling to reduce the land-ocean leakage effects. Land water and glaciers contributions to global sea level change are investigated. Results show that the long-term trend of the mass-induced sea level variations is (2.09±0.54) mm/a, which has a good agreement with the steric sea level change of (2.07±0.62) mm/a from the satellite altimetry and Argo data. The contribution of land water to sea level change is (0.15±0.25) mm/a. The glacier melting contribution to sea level rise is (0.72±0.12) mm/a in Greenland, (0.59±0.10) mm/a in Antarctica, and (0.63±0.09) mm/a for the mountain glaciers (including Alaska, Iceland, Canadian Arctic, High Mountain Asia and Patagonia). Furthermore, the impact of the GRACE gravity field coefficients from different GRACE analysis centers (CSR, JPL and GFZ), first-order coefficient and the second-order coefficient to sea level change are discussed. The impact of first-order coefficient to the mass-induced sea level variations is (0.10±0.08) mm/a, and the second-order coefficient to the mass-induced sea level variations is (0.16±0.04) mm/a. The results from CSR are consistent with GFZ results, while the JPL's results are slightly smaller.
- GRACE,
- sea level change,
- ice melting,
- ocean mass variations

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References(29)

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