期刊
ACTA OCEANOLOGICA SINICA
卷 40, 期 10, 页码 76-83出版社
SPRINGER
DOI: 10.1007/s13131-021-1820-4
关键词
Arctic Ocean; absolute sea level variability; sea level anomaly; satellite altimetry; tide gauge
类别
资金
- Open Fund of Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resource [MESTA-2020-B005]
- Shandong Provincial Natural Science Foundation [ZR2020QD087]
- National Key R&D Program of China [2017YFC0306003, 2016YFB0501703]
- National Natural Science Foundation of China [42104035, 41706115]
This study analyzed the variations of absolute sea level in the Arctic from 1993 to 2018, revealing different linear trends in the region. It was found that accurately calculating VLM is a primary source of uncertainty in interpreting absolute sea level trends. Large differences between satellite-derived and tide gauge results were mainly attributed to uncertainties related to VLM.
Arctic absolute sea level variations were analyzed based on multi-mission satellite altimetry data and tide gauge observations for the period of 1993-2018. The range of linear absolute sea level trends were found -2.00 mm/a to 6.88 mm/a excluding the central Arctic, positive trend rates were predominantly located in shallow water and coastal areas, and negative rates were located in high-latitude areas and Baffin Bay. Satellite-derived results show that the average secular absolute sea level trend was (2.53 +/- 0.42) mm/a in the Arctic region. Large differences were presented between satellite-derived and tide gauge results, which are mainly due to low satellite data coverage, uncertainties in tidal height processing and vertical land movement (VLM). The VLM rates at 11 global navigation satellite system stations around the Arctic Ocean were analyzed, among which 6 stations were tide gauge co-located, the results indicate that the absolute sea level trends after VLM corrected were of the same magnitude as satellite altimetry results. Accurately calculating VLM is the primary uncertainty in interpreting tide gauge measurements such that differences between tide gauge and satellite altimetry data are attributable generally to VLM.
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