Sea level instantaneous budget for 2003–2015
SUMMARY Most studies of sea level budget only indicate the stationary causes for the global mean sea level (GMSL) rise over the course of a time span of interest, providing limited information on temporary changes in the GMSL budget. In this contribution, we present an instantaneous budget of the GM...
Published in: | Geophysical Journal International |
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Oxford University Press (OUP)
2021
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Online Access: | http://dx.doi.org/10.1093/gji/ggab506 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggab506/41771613/ggab506.pdf https://academic.oup.com/gji/article-pdf/229/2/828/42246179/ggab506.pdf |
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croxfordunivpr:10.1093/gji/ggab506 2024-09-30T14:26:34+00:00 Sea level instantaneous budget for 2003–2015 Mu, Dapeng Xu, Tianhe Guan, Meiqian National Natural Science Foundation of China National Key Research and Development Program of China China Postdoctoral Science Foundation 2021 http://dx.doi.org/10.1093/gji/ggab506 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggab506/41771613/ggab506.pdf https://academic.oup.com/gji/article-pdf/229/2/828/42246179/ggab506.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Geophysical Journal International volume 229, issue 2, page 828-837 ISSN 0956-540X 1365-246X journal-article 2021 croxfordunivpr https://doi.org/10.1093/gji/ggab506 2024-09-03T04:12:17Z SUMMARY Most studies of sea level budget only indicate the stationary causes for the global mean sea level (GMSL) rise over the course of a time span of interest, providing limited information on temporary changes in the GMSL budget. In this contribution, we present an instantaneous budget of the GMSL for the period of 2003–2015, which offers new insights on the time evolution of the GMSL budget. We use a space-state model to compute the instantaneous rates of GMSL and their contributing sources (barystatic and steric contributions), to investigate the causes of the GMSL instantaneous budget, which accounts for and quantifies low-frequency variations in GMSL rise. Combining the barystatic GMSL instantaneous rates (estimated from satellite gravimetry) along with a particular choice of steric GMSL instantaneous rates (inferred from an Argo product) achieves closure of the GMSL instantaneous budget with a standard deviation of 0.4 mm yr−1. We find that the barystatic GMSL rate is primarily responsible for the striking fluctuations in the GMSL instantaneous rates between 2009 and 2015. For example, over only 20 months (July 2010 to February 2012), the GMSL (barystatic) rate increases from 0.32 (0.71) to 6.12 (4.55) mm yr−1. These strong fluctuations mainly result from hydrology and mountain glacier mass variations rather than mass loss in ice sheet, for instance, Australia slowed ∼1.2 mm yr−1 equivalent contribution to GMSL rise over the year 2010, which is approximately four times the linear rate of Antarctica mass loss. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Oxford University Press Geophysical Journal International |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
SUMMARY Most studies of sea level budget only indicate the stationary causes for the global mean sea level (GMSL) rise over the course of a time span of interest, providing limited information on temporary changes in the GMSL budget. In this contribution, we present an instantaneous budget of the GMSL for the period of 2003–2015, which offers new insights on the time evolution of the GMSL budget. We use a space-state model to compute the instantaneous rates of GMSL and their contributing sources (barystatic and steric contributions), to investigate the causes of the GMSL instantaneous budget, which accounts for and quantifies low-frequency variations in GMSL rise. Combining the barystatic GMSL instantaneous rates (estimated from satellite gravimetry) along with a particular choice of steric GMSL instantaneous rates (inferred from an Argo product) achieves closure of the GMSL instantaneous budget with a standard deviation of 0.4 mm yr−1. We find that the barystatic GMSL rate is primarily responsible for the striking fluctuations in the GMSL instantaneous rates between 2009 and 2015. For example, over only 20 months (July 2010 to February 2012), the GMSL (barystatic) rate increases from 0.32 (0.71) to 6.12 (4.55) mm yr−1. These strong fluctuations mainly result from hydrology and mountain glacier mass variations rather than mass loss in ice sheet, for instance, Australia slowed ∼1.2 mm yr−1 equivalent contribution to GMSL rise over the year 2010, which is approximately four times the linear rate of Antarctica mass loss. |
author2 |
National Natural Science Foundation of China National Key Research and Development Program of China China Postdoctoral Science Foundation |
format |
Article in Journal/Newspaper |
author |
Mu, Dapeng Xu, Tianhe Guan, Meiqian |
spellingShingle |
Mu, Dapeng Xu, Tianhe Guan, Meiqian Sea level instantaneous budget for 2003–2015 |
author_facet |
Mu, Dapeng Xu, Tianhe Guan, Meiqian |
author_sort |
Mu, Dapeng |
title |
Sea level instantaneous budget for 2003–2015 |
title_short |
Sea level instantaneous budget for 2003–2015 |
title_full |
Sea level instantaneous budget for 2003–2015 |
title_fullStr |
Sea level instantaneous budget for 2003–2015 |
title_full_unstemmed |
Sea level instantaneous budget for 2003–2015 |
title_sort |
sea level instantaneous budget for 2003–2015 |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/gji/ggab506 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggab506/41771613/ggab506.pdf https://academic.oup.com/gji/article-pdf/229/2/828/42246179/ggab506.pdf |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_source |
Geophysical Journal International volume 229, issue 2, page 828-837 ISSN 0956-540X 1365-246X |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/gji/ggab506 |
container_title |
Geophysical Journal International |
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1811646846186029056 |