Greenland temperature and precipitation over the last 20 000 years using data assimilation
Reconstructions of past temperature and precipitation are fundamental to modeling the Greenland Ice Sheet and assessing its sensitivity to climate. Paleoclimate information is sourced from proxy records and climate-model simulations; however, the former are spatially incomplete while the latter are...
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ftdoajarticles:oai:doaj.org/article:aacdd696e3f74025bd36bb8790d88818 2023-05-15T16:26:46+02:00 Greenland temperature and precipitation over the last 20 000 years using data assimilation J. A. Badgeley E. J. Steig G. J. Hakim T. J. Fudge 2020-07-01T00:00:00Z https://doi.org/10.5194/cp-16-1325-2020 https://doaj.org/article/aacdd696e3f74025bd36bb8790d88818 EN eng Copernicus Publications https://cp.copernicus.org/articles/16/1325/2020/cp-16-1325-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-1325-2020 1814-9324 1814-9332 https://doaj.org/article/aacdd696e3f74025bd36bb8790d88818 Climate of the Past, Vol 16, Pp 1325-1346 (2020) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.5194/cp-16-1325-2020 2022-12-30T22:20:04Z Reconstructions of past temperature and precipitation are fundamental to modeling the Greenland Ice Sheet and assessing its sensitivity to climate. Paleoclimate information is sourced from proxy records and climate-model simulations; however, the former are spatially incomplete while the latter are sensitive to model dynamics and boundary conditions. Efforts to combine these sources of information to reconstruct spatial patterns of Greenland climate over glacial–interglacial cycles have been limited by assumptions of fixed spatial patterns and a restricted use of proxy data. We avoid these limitations by using paleoclimate data assimilation to create independent reconstructions of mean-annual temperature and precipitation for the last 20 000 years. Our method uses oxygen isotope ratios of ice and accumulation rates from long ice-core records and extends this information to all locations across Greenland using spatial relationships derived from a transient climate-model simulation. Standard evaluation metrics for this method show that our results capture climate at locations without ice-core records. Our results differ from previous work in the reconstructed spatial pattern of temperature change during abrupt climate transitions; this indicates a need for additional proxy data and additional transient climate-model simulations. We investigate the relationship between precipitation and temperature, finding that it is frequency dependent and spatially variable, suggesting that thermodynamic scaling methods commonly used in ice-sheet modeling are overly simplistic. Our results demonstrate that paleoclimate data assimilation is a useful tool for reconstructing the spatial and temporal patterns of past climate on timescales relevant to ice sheets. Article in Journal/Newspaper Greenland ice core Ice Sheet Directory of Open Access Journals: DOAJ Articles Greenland Climate of the Past 16 4 1325 1346 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 J. A. Badgeley E. J. Steig G. J. Hakim T. J. Fudge Greenland temperature and precipitation over the last 20 000 years using data assimilation |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Reconstructions of past temperature and precipitation are fundamental to modeling the Greenland Ice Sheet and assessing its sensitivity to climate. Paleoclimate information is sourced from proxy records and climate-model simulations; however, the former are spatially incomplete while the latter are sensitive to model dynamics and boundary conditions. Efforts to combine these sources of information to reconstruct spatial patterns of Greenland climate over glacial–interglacial cycles have been limited by assumptions of fixed spatial patterns and a restricted use of proxy data. We avoid these limitations by using paleoclimate data assimilation to create independent reconstructions of mean-annual temperature and precipitation for the last 20 000 years. Our method uses oxygen isotope ratios of ice and accumulation rates from long ice-core records and extends this information to all locations across Greenland using spatial relationships derived from a transient climate-model simulation. Standard evaluation metrics for this method show that our results capture climate at locations without ice-core records. Our results differ from previous work in the reconstructed spatial pattern of temperature change during abrupt climate transitions; this indicates a need for additional proxy data and additional transient climate-model simulations. We investigate the relationship between precipitation and temperature, finding that it is frequency dependent and spatially variable, suggesting that thermodynamic scaling methods commonly used in ice-sheet modeling are overly simplistic. Our results demonstrate that paleoclimate data assimilation is a useful tool for reconstructing the spatial and temporal patterns of past climate on timescales relevant to ice sheets. |
format |
Article in Journal/Newspaper |
author |
J. A. Badgeley E. J. Steig G. J. Hakim T. J. Fudge |
author_facet |
J. A. Badgeley E. J. Steig G. J. Hakim T. J. Fudge |
author_sort |
J. A. Badgeley |
title |
Greenland temperature and precipitation over the last 20 000 years using data assimilation |
title_short |
Greenland temperature and precipitation over the last 20 000 years using data assimilation |
title_full |
Greenland temperature and precipitation over the last 20 000 years using data assimilation |
title_fullStr |
Greenland temperature and precipitation over the last 20 000 years using data assimilation |
title_full_unstemmed |
Greenland temperature and precipitation over the last 20 000 years using data assimilation |
title_sort |
greenland temperature and precipitation over the last 20 000 years using data assimilation |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-1325-2020 https://doaj.org/article/aacdd696e3f74025bd36bb8790d88818 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_source |
Climate of the Past, Vol 16, Pp 1325-1346 (2020) |
op_relation |
https://cp.copernicus.org/articles/16/1325/2020/cp-16-1325-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-1325-2020 1814-9324 1814-9332 https://doaj.org/article/aacdd696e3f74025bd36bb8790d88818 |
op_doi |
https://doi.org/10.5194/cp-16-1325-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
4 |
container_start_page |
1325 |
op_container_end_page |
1346 |
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1766015748934729728 |