Journal
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume 127, Issue 9, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JC018994
Keywords
absolute sea level change; tide gauge; GNSS; satellite altimetry; Chinese coast
Categories
Funding
- National Key Research and Development Program of China [2020YFB0505805]
- Basic Scientific Fund for National Public Research Institutes of China [2022S03]
- National Natural Science Foundation of China [41706115, 42004030]
- Wenhai Program of the S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) [2021WHZZB1002]
- Technology Innovation Pilot Program of Shandong Province [2020YFB0505800]
- coastal GNSS CORS operational observation system of MNR, China
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This study quantifies the absolute sea level change along the coast of China from 1993 to 2019 using tide gauge and Global Navigation Satellite System data. The results show that the sea level rise along the Chinese coast varies in different regions, and after correcting for vertical land motion, the absolute sea level rise in China is higher than the global average.
This study quantifies the absolute sea level (ASL) change along the coast of China from 1993 to 2019 using tide gauge (TG) and Global Navigation Satellite System (GNSS) data. The sea level change at 12 collocated TG and GNSS stations along the Chinese coast are first analyzed by TG + GNSS data. Then the ASL rise and its spatial variation along the coast of China and that in surrounding oceans are studied using TG + GNSS data and satellite altimetry products. The results show that the relative sea level rise along the Chinese coast varied from 2.61 +/- 0.76 to 5.56 +/- 0.70 mm/yr, while the effect of vertical land motion (VLM) ranged from -1.46 +/- 0.30 to 1.07 +/- 0.38 mm/yr. After correcting the effect of the VLM, the ASL rise ranged from 2.51 +/- 0.86 to 5.03 +/- 0.60 mm/yr, with a mean rate of 3.94 +/- 0.88 mm/yr, which was 0.7 mm/yr higher than the global average. It is found that ASL rise rate is significantly higher in Chinese seas and neighboring oceans, with a meridional distribution in the East China Sea and a zonal distribution in the South China Sea. This may be related to factors such as sea surface temperature rise, atmospheric pressure decrease, freshwater runoff, zonal wind stress anomaly, and alongshore currents in the area.
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