Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model
We conduct sensitivity experiments using a general circulation model that has an explicit water source tagging capability forced by prescribed composites of pre-industrial sea-ice concentrations (SICs) and corresponding sea surface temperatures (SSTs) to understand the impact of sea-ice anomalies on...
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ftdoajarticles:oai:doaj.org/article:9278d2aa893e492eaecd28e076bd3aa9 2023-05-15T13:32:06+02:00 Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model H. Wang J. G. Fyke J. T. M. Lenaerts J. M. Nusbaumer H. Singh D. Noone P. J. Rasch R. Zhang 2020-02-01T00:00:00Z https://doi.org/10.5194/tc-14-429-2020 https://doaj.org/article/9278d2aa893e492eaecd28e076bd3aa9 EN eng Copernicus Publications https://www.the-cryosphere.net/14/429/2020/tc-14-429-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-429-2020 1994-0416 1994-0424 https://doaj.org/article/9278d2aa893e492eaecd28e076bd3aa9 The Cryosphere, Vol 14, Pp 429-444 (2020) Environmental sciences GE1-350 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/tc-14-429-2020 2022-12-31T13:15:42Z We conduct sensitivity experiments using a general circulation model that has an explicit water source tagging capability forced by prescribed composites of pre-industrial sea-ice concentrations (SICs) and corresponding sea surface temperatures (SSTs) to understand the impact of sea-ice anomalies on regional evaporation, moisture transport and source–receptor relationships for Antarctic precipitation in the absence of anthropogenic forcing. Surface sensible heat fluxes, evaporation and column-integrated water vapor are larger over Southern Ocean (SO) areas with lower SICs. Changes in Antarctic precipitation and its source attribution with SICs have a strong spatial variability. Among the tagged source regions, the Southern Ocean (south of 50 ∘ S) contributes the most (40 %) to the Antarctic total precipitation, followed by more northerly ocean basins, most notably the South Pacific Ocean (27%), southern Indian Ocean (16 %) and South Atlantic Ocean (11 %). Comparing two experiments prescribed with high and low pre-industrial SICs, respectively, the annual mean Antarctic precipitation is about 150 Gt yr −1 (or 6 %) more in the lower SIC case than in the higher SIC case. This difference is larger than the model-simulated interannual variability in Antarctic precipitation (99 Gt yr −1 ). The contrast in contribution from the Southern Ocean, 102 Gt yr −1 , is even more significant compared to the interannual variability of 35 Gt yr −1 in Antarctic precipitation that originates from the Southern Ocean. The horizontal transport pathways from individual vapor source regions to Antarctica are largely determined by large-scale atmospheric circulation patterns. Vapor from lower-latitude source regions takes elevated pathways to Antarctica. In contrast, vapor from the Southern Ocean moves southward within the lower troposphere to the Antarctic continent along moist isentropes that are largely shaped by local ambient conditions and coastal topography. This study also highlights the importance of atmospheric dynamics in ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice South Atlantic Ocean Southern Ocean The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean The Antarctic Pacific Indian The Cryosphere 14 2 429 444 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 H. Wang J. G. Fyke J. T. M. Lenaerts J. M. Nusbaumer H. Singh D. Noone P. J. Rasch R. Zhang Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
We conduct sensitivity experiments using a general circulation model that has an explicit water source tagging capability forced by prescribed composites of pre-industrial sea-ice concentrations (SICs) and corresponding sea surface temperatures (SSTs) to understand the impact of sea-ice anomalies on regional evaporation, moisture transport and source–receptor relationships for Antarctic precipitation in the absence of anthropogenic forcing. Surface sensible heat fluxes, evaporation and column-integrated water vapor are larger over Southern Ocean (SO) areas with lower SICs. Changes in Antarctic precipitation and its source attribution with SICs have a strong spatial variability. Among the tagged source regions, the Southern Ocean (south of 50 ∘ S) contributes the most (40 %) to the Antarctic total precipitation, followed by more northerly ocean basins, most notably the South Pacific Ocean (27%), southern Indian Ocean (16 %) and South Atlantic Ocean (11 %). Comparing two experiments prescribed with high and low pre-industrial SICs, respectively, the annual mean Antarctic precipitation is about 150 Gt yr −1 (or 6 %) more in the lower SIC case than in the higher SIC case. This difference is larger than the model-simulated interannual variability in Antarctic precipitation (99 Gt yr −1 ). The contrast in contribution from the Southern Ocean, 102 Gt yr −1 , is even more significant compared to the interannual variability of 35 Gt yr −1 in Antarctic precipitation that originates from the Southern Ocean. The horizontal transport pathways from individual vapor source regions to Antarctica are largely determined by large-scale atmospheric circulation patterns. Vapor from lower-latitude source regions takes elevated pathways to Antarctica. In contrast, vapor from the Southern Ocean moves southward within the lower troposphere to the Antarctic continent along moist isentropes that are largely shaped by local ambient conditions and coastal topography. This study also highlights the importance of atmospheric dynamics in ... |
format |
Article in Journal/Newspaper |
author |
H. Wang J. G. Fyke J. T. M. Lenaerts J. M. Nusbaumer H. Singh D. Noone P. J. Rasch R. Zhang |
author_facet |
H. Wang J. G. Fyke J. T. M. Lenaerts J. M. Nusbaumer H. Singh D. Noone P. J. Rasch R. Zhang |
author_sort |
H. Wang |
title |
Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model |
title_short |
Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model |
title_full |
Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model |
title_fullStr |
Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model |
title_full_unstemmed |
Influence of sea-ice anomalies on Antarctic precipitation using source attribution in the Community Earth System Model |
title_sort |
influence of sea-ice anomalies on antarctic precipitation using source attribution in the community earth system model |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-429-2020 https://doaj.org/article/9278d2aa893e492eaecd28e076bd3aa9 |
geographic |
Antarctic Southern Ocean The Antarctic Pacific Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic Pacific Indian |
genre |
Antarc* Antarctic Antarctica Sea ice South Atlantic Ocean Southern Ocean The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Sea ice South Atlantic Ocean Southern Ocean The Cryosphere |
op_source |
The Cryosphere, Vol 14, Pp 429-444 (2020) |
op_relation |
https://www.the-cryosphere.net/14/429/2020/tc-14-429-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-429-2020 1994-0416 1994-0424 https://doaj.org/article/9278d2aa893e492eaecd28e076bd3aa9 |
op_doi |
https://doi.org/10.5194/tc-14-429-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
2 |
container_start_page |
429 |
op_container_end_page |
444 |
_version_ |
1766024253895868416 |