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XU Tianhe, YANG Yuanyuan, MU Dapeng, YIN Peng. The causes of coastal sea level change[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210643
Citation: XU Tianhe, YANG Yuanyuan, MU Dapeng, YIN Peng. The causes of coastal sea level change[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210643

The causes of coastal sea level change

doi: 10.13203/j.whugis20210643
Funds:

The National Natural Science Foundation of China (42192534,41904081); the National Key Research and Development Program of China (2020YFB0505800).

  • Received Date: 2022-03-20
    Available Online: 2022-04-21
  • Objectives : Coastal sea level rise poses direct threats to human livelihood, understanding its causes is of scientific importance, and can provide useful strategies for adapting sea level rise. This paper aims to investigate the causes of coastal sea level change using satellite altimetry, satellite time-variable gravity, and Argo floats. Methods : Given that time-variable gravity suffers from serious leakage issue over coastal area, we use land mass variations from a mascon solution to simulate the leakage from land into oceans, which is estimated to be 0.68 mm/a. Results : On seasonal and non-seasonal scales, satellite altimetry measurements are well explained by the summation of time-variable gravity and Argo floats, demonstrating the closure of coastal sea level change. On the other hand, satellite altimetry suggests a rate of (3.32±0.45) mm/a for coastal sea level rise, but the summation of timevariable gravity and Argo floats yields a (2.25±0.51) mm/a rate. Conclusions : There is a 1mm/a rate discrepancy in coastal sea level budget, suggesting that closing the sea level budget for coastal zone is challenged by uncertainties. This is because the in situ measurements are sparse for Argo over coastal zone, which may underestimate the steric trend; furthermore, leakage correction and vertical land motion may also cause some uncertainties.
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The causes of coastal sea level change

doi: 10.13203/j.whugis20210643
Funds:

The National Natural Science Foundation of China (42192534,41904081); the National Key Research and Development Program of China (2020YFB0505800).

Abstract: Objectives : Coastal sea level rise poses direct threats to human livelihood, understanding its causes is of scientific importance, and can provide useful strategies for adapting sea level rise. This paper aims to investigate the causes of coastal sea level change using satellite altimetry, satellite time-variable gravity, and Argo floats. Methods : Given that time-variable gravity suffers from serious leakage issue over coastal area, we use land mass variations from a mascon solution to simulate the leakage from land into oceans, which is estimated to be 0.68 mm/a. Results : On seasonal and non-seasonal scales, satellite altimetry measurements are well explained by the summation of time-variable gravity and Argo floats, demonstrating the closure of coastal sea level change. On the other hand, satellite altimetry suggests a rate of (3.32±0.45) mm/a for coastal sea level rise, but the summation of timevariable gravity and Argo floats yields a (2.25±0.51) mm/a rate. Conclusions : There is a 1mm/a rate discrepancy in coastal sea level budget, suggesting that closing the sea level budget for coastal zone is challenged by uncertainties. This is because the in situ measurements are sparse for Argo over coastal zone, which may underestimate the steric trend; furthermore, leakage correction and vertical land motion may also cause some uncertainties.

XU Tianhe, YANG Yuanyuan, MU Dapeng, YIN Peng. The causes of coastal sea level change[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210643
Citation: XU Tianhe, YANG Yuanyuan, MU Dapeng, YIN Peng. The causes of coastal sea level change[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210643
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