Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries
Antarctic snow accumulation is a direct regulator of the global sea level changes, but quantification of its long-term evolution at the ice sheet scale is challenging. Here, we combine a most recently complied dataset of ice core records with spatial coherence patterns from five different reanalysis...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5020590 2023-07-23T04:15:46+02:00 Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries Wang, Y. Zhou, M. Sun, Y. 2023-07-11 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020590 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3174 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020590 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-3174 2023-07-02T23:40:07Z Antarctic snow accumulation is a direct regulator of the global sea level changes, but quantification of its long-term evolution at the ice sheet scale is challenging. Here, we combine a most recently complied dataset of ice core records with spatial coherence patterns from five different reanalysis products and two regional climate models, for the first time, to produce a reconciled 310-year reconstruction of spatially and temporally complete snow accumulation over the Antarctic Ice Sheet (AIS). Despite greatly variable signs and magnitudes of reconstructed snow accumulation trends at the different regions, a significant positive trend (3.6±0.8 Gt yr -1 decade -1 ) is observed for snow accumulation over the entire AIS during the past 300 years, with a larger increase rate since 1801. The increased snow accumulation cumulatively dampened global sea-level rise by ~14 mm between 1901 and 2010. The first and second modes of the empirical orthogonal function analysis (EOF1 and EOF2) capture 38.0% and 24.6% of the total variability in reconstructed snow accumulation, respectively. EOF1 consists of an east-west dipole of snow accumulation changes over West Antarctica, primarily driven by the southern annular mode (SAM) variability. EOF2 represents a strong signal over the whole Antarctic Peninsula and the coastal West Antarctica, which is not associated with SAM, but with El Niño–Southern Oscillation (ENSO) at the decadal scale. Conference Object Antarc* Antarctic Antarctic Peninsula Antarctica ice core Ice Sheet West Antarctica GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Antarctic Peninsula The Antarctic West Antarctica |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Antarctic snow accumulation is a direct regulator of the global sea level changes, but quantification of its long-term evolution at the ice sheet scale is challenging. Here, we combine a most recently complied dataset of ice core records with spatial coherence patterns from five different reanalysis products and two regional climate models, for the first time, to produce a reconciled 310-year reconstruction of spatially and temporally complete snow accumulation over the Antarctic Ice Sheet (AIS). Despite greatly variable signs and magnitudes of reconstructed snow accumulation trends at the different regions, a significant positive trend (3.6±0.8 Gt yr -1 decade -1 ) is observed for snow accumulation over the entire AIS during the past 300 years, with a larger increase rate since 1801. The increased snow accumulation cumulatively dampened global sea-level rise by ~14 mm between 1901 and 2010. The first and second modes of the empirical orthogonal function analysis (EOF1 and EOF2) capture 38.0% and 24.6% of the total variability in reconstructed snow accumulation, respectively. EOF1 consists of an east-west dipole of snow accumulation changes over West Antarctica, primarily driven by the southern annular mode (SAM) variability. EOF2 represents a strong signal over the whole Antarctic Peninsula and the coastal West Antarctica, which is not associated with SAM, but with El Niño–Southern Oscillation (ENSO) at the decadal scale. |
format |
Conference Object |
author |
Wang, Y. Zhou, M. Sun, Y. |
spellingShingle |
Wang, Y. Zhou, M. Sun, Y. Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries |
author_facet |
Wang, Y. Zhou, M. Sun, Y. |
author_sort |
Wang, Y. |
title |
Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries |
title_short |
Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries |
title_full |
Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries |
title_fullStr |
Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries |
title_full_unstemmed |
Global sea level rise dampened by increasing Antarctic snow accumulation during the past three centuries |
title_sort |
global sea level rise dampened by increasing antarctic snow accumulation during the past three centuries |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020590 |
geographic |
Antarctic Antarctic Peninsula The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core Ice Sheet West Antarctica |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3174 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020590 |
op_doi |
https://doi.org/10.57757/IUGG23-3174 |
_version_ |
1772176783254224896 |