Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores
Abstract Previous reconstructions of summer temperatures from ice cores have relied on a statistical relationship between a melt layer and temperature observed at nearby stations. This study presents a novel method for reconstructing summer temperatures from melt layers in ice cores using an energy...
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American Geophysical Union (AGU)
2021
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ftdoajarticles:oai:doaj.org/article:efa14093fd2e4936bc63b868d36d0204 2023-05-15T16:29:50+02:00 Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores Koji Fujita Sumito Matoba Yoshinori Iizuka Nozomu Takeuchi Akane Tsushima Yutaka Kurosaki Teruo Aoki 2021-07-01T00:00:00Z https://doi.org/10.1029/2020EA001590 https://doaj.org/article/efa14093fd2e4936bc63b868d36d0204 EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2020EA001590 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2020EA001590 https://doaj.org/article/efa14093fd2e4936bc63b868d36d0204 Earth and Space Science, Vol 8, Iss 7, Pp n/a-n/a (2021) summer temperature ice core melt layer energy balance model Astronomy QB1-991 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1029/2020EA001590 2022-12-31T06:36:04Z Abstract Previous reconstructions of summer temperatures from ice cores have relied on a statistical relationship between a melt layer and temperature observed at nearby stations. This study presents a novel method for reconstructing summer temperatures from melt layers in ice cores using an energy balance model that incorporates heat conduction and meltwater refreezing in the firn. We use the seasonal patterns in the ERA‐Interim reanalysis data set for an ice core site to calculate the amounts of refreezing water within the firn under various summer mean temperature (SMT) and annual precipitation conditions, and prepared calibration tables containing these three variables. We then estimate the SMTs from the refreezing amount and annual accumulation, both of which can be obtained from an ice core. We apply this method to four ice cores that were recovered from sites with different climates: two sites on the Greenland Ice Sheet, one in Alaska, and one in Russian Altai. The reconstructed SMTs show comparable variations with those of observed temperatures at nearby stations. The nonlinear relationship between SMT and melt layer thickness differs between sites, indicating that a single linear approximation cannot be employed to estimate SMT. Sensitivity analyses suggest that the annual temperature range, amount of annual precipitation, and firn albedo (which is a time‐invariant value in the model) significantly affect the relationship between SMT and melt layer thickness. This new method provides an alternative to existing approaches and yields an independent estimate of SMT from ice cores that have been affected by melting. Article in Journal/Newspaper Greenland ice core Ice Sheet Alaska Directory of Open Access Journals: DOAJ Articles Greenland Earth and Space Science 8 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
summer temperature ice core melt layer energy balance model Astronomy QB1-991 Geology QE1-996.5 |
spellingShingle |
summer temperature ice core melt layer energy balance model Astronomy QB1-991 Geology QE1-996.5 Koji Fujita Sumito Matoba Yoshinori Iizuka Nozomu Takeuchi Akane Tsushima Yutaka Kurosaki Teruo Aoki Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores |
topic_facet |
summer temperature ice core melt layer energy balance model Astronomy QB1-991 Geology QE1-996.5 |
description |
Abstract Previous reconstructions of summer temperatures from ice cores have relied on a statistical relationship between a melt layer and temperature observed at nearby stations. This study presents a novel method for reconstructing summer temperatures from melt layers in ice cores using an energy balance model that incorporates heat conduction and meltwater refreezing in the firn. We use the seasonal patterns in the ERA‐Interim reanalysis data set for an ice core site to calculate the amounts of refreezing water within the firn under various summer mean temperature (SMT) and annual precipitation conditions, and prepared calibration tables containing these three variables. We then estimate the SMTs from the refreezing amount and annual accumulation, both of which can be obtained from an ice core. We apply this method to four ice cores that were recovered from sites with different climates: two sites on the Greenland Ice Sheet, one in Alaska, and one in Russian Altai. The reconstructed SMTs show comparable variations with those of observed temperatures at nearby stations. The nonlinear relationship between SMT and melt layer thickness differs between sites, indicating that a single linear approximation cannot be employed to estimate SMT. Sensitivity analyses suggest that the annual temperature range, amount of annual precipitation, and firn albedo (which is a time‐invariant value in the model) significantly affect the relationship between SMT and melt layer thickness. This new method provides an alternative to existing approaches and yields an independent estimate of SMT from ice cores that have been affected by melting. |
format |
Article in Journal/Newspaper |
author |
Koji Fujita Sumito Matoba Yoshinori Iizuka Nozomu Takeuchi Akane Tsushima Yutaka Kurosaki Teruo Aoki |
author_facet |
Koji Fujita Sumito Matoba Yoshinori Iizuka Nozomu Takeuchi Akane Tsushima Yutaka Kurosaki Teruo Aoki |
author_sort |
Koji Fujita |
title |
Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores |
title_short |
Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores |
title_full |
Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores |
title_fullStr |
Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores |
title_full_unstemmed |
Physically Based Summer Temperature Reconstruction From Melt Layers in Ice Cores |
title_sort |
physically based summer temperature reconstruction from melt layers in ice cores |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020EA001590 https://doaj.org/article/efa14093fd2e4936bc63b868d36d0204 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet Alaska |
genre_facet |
Greenland ice core Ice Sheet Alaska |
op_source |
Earth and Space Science, Vol 8, Iss 7, Pp n/a-n/a (2021) |
op_relation |
https://doi.org/10.1029/2020EA001590 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2020EA001590 https://doaj.org/article/efa14093fd2e4936bc63b868d36d0204 |
op_doi |
https://doi.org/10.1029/2020EA001590 |
container_title |
Earth and Space Science |
container_volume |
8 |
container_issue |
7 |
_version_ |
1766019551573573632 |