Origin of interannual variability in global mean sea level

Proceedings of the National Academy of Sciences of the United States of America
Benjamin D HamlingtonSe-Hyeon Cheon

Abstract

The two dominant drivers of the global mean sea level (GMSL) variability at interannual timescales are steric changes due to changes in ocean heat content and barystatic changes due to the exchange of water mass between land and ocean. With Gravity Recovery and Climate Experiment (GRACE) satellites and Argo profiling floats, it has been possible to measure the relative steric and barystatic contributions to GMSL since 2004. While efforts to "close the GMSL budget" with satellite altimetry and other observing systems have been largely successful with regards to trends, the short time period covered by these records prohibits a full understanding of the drivers of interannual to decadal variability in GMSL. One particular area of focus is the link between variations in the El Niño-Southern Oscillation (ENSO) and GMSL. Recent literature disagrees on the relative importance of steric and barystatic contributions to interannual to decadal variability in GMSL. Here, we use a multivariate data analysis technique to estimate variability in barystatic and steric contributions to GMSL back to 1982. These independent estimates explain most of the observed interannual variability in satellite altimeter-measured GMSL. Both processes, which ...Continue Reading

References

Jan 24, 2018·Proceedings of the National Academy of Sciences of the United States of America·Bridget R ScanlonMarc F P Bierkens
Feb 15, 2018·Proceedings of the National Academy of Sciences of the United States of America·R S NeremG T Mitchum
Jan 9, 2019·Proceedings of the National Academy of Sciences of the United States of America·Laure ZannaPatrick Heimbach

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Citations

Jul 2, 2021·Scientific Reports·Se-Hyeon CheonHrishikesh A Chandanpurkar

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