期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 24, 页码 12306-12314出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL075419
关键词
sea level; elastic deformation; ice mass loss; altimetry; GPS; tide gauges
资金
- Netherlands Organisation for Scientific Research (NWO) through VIDI [864.12.012]
- Australian Research Council Future Fellowship [FT110100207]
- Australian Research Council Special Research Initiative for Antarctic Gateway Partnership [SR140300001, DP150100615]
Present-day mass redistribution increases the total ocean mass and, on average, causes the ocean bottom to subside elastically. Therefore, barystatic sea level rise is larger than the resulting global mean geocentric sea level rise, observed by satellite altimetry and GPS-corrected tide gauges. We use realistic estimates of mass redistribution from ice mass loss and land water storage to quantify the resulting ocean bottom deformation and its effect on global and regional ocean volume change estimates. Over 1993-2014, the resulting globally averaged geocentric sea level change is 8% smaller than the barystatic contribution. Over the altimetry domain, the difference is about 5%, and due to this effect, barystatic sea level rise will be underestimated by more than 0.1 mm/yr over 1993-2014. Regional differences are often larger: up to 1mm/yr over the Arctic Ocean and 0.4 mm/yr in the South Pacific. Ocean bottom deformation should be considered when regional sea level changes are observed in a geocentric reference frame.
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