Improving temperature reconstructions from ice-core water-isotope records
Oxygen and hydrogen isotope ratios in polar precipitation are widely used as proxies for local temperature. Used in combination, oxygen and hydrogen isotope ratios also provide information on sea surface temperature at the oceanic moisture source locations where polar precipitation originates. Tempe...
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ftcopernicus:oai:publications.copernicus.org:cpd93932 2023-05-15T13:31:40+02:00 Improving temperature reconstructions from ice-core water-isotope records Markle, Bradley R. Steig, Eric J. 2021-04-12 application/pdf https://doi.org/10.5194/cp-2021-37 https://cp.copernicus.org/preprints/cp-2021-37/ eng eng doi:10.5194/cp-2021-37 https://cp.copernicus.org/preprints/cp-2021-37/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-2021-37 2021-04-19T16:22:15Z Oxygen and hydrogen isotope ratios in polar precipitation are widely used as proxies for local temperature. Used in combination, oxygen and hydrogen isotope ratios also provide information on sea surface temperature at the oceanic moisture source locations where polar precipitation originates. Temperature reconstructions obtained from ice core records generally rely on linear approximations of the relationships among local temperature, source temperature and water-isotope values. However, there are important nonlinearities that significantly affect such reconstructions, particularly for source-region temperatures. Here, we describe a temperature reconstruction method that accounts for these nonlinearities. We provide new reconstructions of absolute surface temperature, condensation temperature, and source-region evaporation temperature for all long Antarctic ice-core records for which the necessary data are available. We also provide thorough uncertainty estimates on all temperature histories. Our reconstructions constrain the pattern and magnitude of polar amplification in the past and reveal asymmetries in the temperature histories of East and West Antarctica. Text Antarc* Antarctic Antarctica ice core West Antarctica Copernicus Publications: E-Journals Antarctic West Antarctica |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Oxygen and hydrogen isotope ratios in polar precipitation are widely used as proxies for local temperature. Used in combination, oxygen and hydrogen isotope ratios also provide information on sea surface temperature at the oceanic moisture source locations where polar precipitation originates. Temperature reconstructions obtained from ice core records generally rely on linear approximations of the relationships among local temperature, source temperature and water-isotope values. However, there are important nonlinearities that significantly affect such reconstructions, particularly for source-region temperatures. Here, we describe a temperature reconstruction method that accounts for these nonlinearities. We provide new reconstructions of absolute surface temperature, condensation temperature, and source-region evaporation temperature for all long Antarctic ice-core records for which the necessary data are available. We also provide thorough uncertainty estimates on all temperature histories. Our reconstructions constrain the pattern and magnitude of polar amplification in the past and reveal asymmetries in the temperature histories of East and West Antarctica. |
format |
Text |
author |
Markle, Bradley R. Steig, Eric J. |
spellingShingle |
Markle, Bradley R. Steig, Eric J. Improving temperature reconstructions from ice-core water-isotope records |
author_facet |
Markle, Bradley R. Steig, Eric J. |
author_sort |
Markle, Bradley R. |
title |
Improving temperature reconstructions from ice-core water-isotope records |
title_short |
Improving temperature reconstructions from ice-core water-isotope records |
title_full |
Improving temperature reconstructions from ice-core water-isotope records |
title_fullStr |
Improving temperature reconstructions from ice-core water-isotope records |
title_full_unstemmed |
Improving temperature reconstructions from ice-core water-isotope records |
title_sort |
improving temperature reconstructions from ice-core water-isotope records |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-2021-37 https://cp.copernicus.org/preprints/cp-2021-37/ |
geographic |
Antarctic West Antarctica |
geographic_facet |
Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctica ice core West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica ice core West Antarctica |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-2021-37 https://cp.copernicus.org/preprints/cp-2021-37/ |
op_doi |
https://doi.org/10.5194/cp-2021-37 |
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1766020103076315136 |