New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies
Due to recent atmospheric and oceanic warming, the Antarctic Peninsula is one of the most challenging regions of Antarctica to understand in terms of both local- and regional-scale climate signals. Steep topography and a lack of long-term and in situ meteorological observations complicate the extrap...
Published in: | The Cryosphere |
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Copernicus Publications
2018
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Online Access: | https://doi.org/10.5194/tc-12-1069-2018 https://www.the-cryosphere.net/12/1069/2018/tc-12-1069-2018.pdf https://doaj.org/article/e3f55973780045f9a895ed6a15d5807d |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:e3f55973780045f9a895ed6a15d5807d 2023-05-15T13:46:11+02:00 New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies F. Fernandoy D. Tetzner H. Meyer G. Gacitúa K. Hoffmann U. Falk F. Lambert S. MacDonell 2018-03-01 https://doi.org/10.5194/tc-12-1069-2018 https://www.the-cryosphere.net/12/1069/2018/tc-12-1069-2018.pdf https://doaj.org/article/e3f55973780045f9a895ed6a15d5807d en eng Copernicus Publications doi:10.5194/tc-12-1069-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/1069/2018/tc-12-1069-2018.pdf https://doaj.org/article/e3f55973780045f9a895ed6a15d5807d undefined The Cryosphere, Vol 12, Pp 1069-1090 (2018) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/tc-12-1069-2018 2023-01-22T19:31:57Z Due to recent atmospheric and oceanic warming, the Antarctic Peninsula is one of the most challenging regions of Antarctica to understand in terms of both local- and regional-scale climate signals. Steep topography and a lack of long-term and in situ meteorological observations complicate the extrapolation of existing climate models to the sub-regional scale. Therefore, new techniques must be developed to better understand processes operating in the region. Isotope signals are traditionally related mainly to atmospheric conditions, but a detailed analysis of individual components can give new insight into oceanic and atmospheric processes. This paper aims to use new isotopic records collected from snow and firn cores in conjunction with existing meteorological and oceanic datasets to determine changes at the climatic scale in the northern extent of the Antarctic Peninsula. In particular, a discernible effect of sea ice cover on local temperatures and the expression of climatic modes, especially the Southern Annular Mode (SAM), is demonstrated. In years with a large sea ice extension in winter (negative SAM anomaly), an inversion layer in the lower troposphere develops at the coastal zone. Therefore, an isotope–temperature relationship (δ–T) valid for all periods cannot be obtained, and instead the δ–T depends on the seasonal variability of oceanic conditions. Comparatively, transitional seasons (autumn and spring) have a consistent isotope–temperature gradient of +0.69 ‰ °C−1. As shown by firn core analysis, the near-surface temperature in the northern-most portion of the Antarctic Peninsula shows a decreasing trend (−0.33 °C year−1) between 2008 and 2014. In addition, the deuterium excess (dexcess) is demonstrated to be a reliable indicator of seasonal oceanic conditions, and therefore suitable to improve a firn age model based on seasonal dexcess variability. The annual accumulation rate in this region is highly variable, ranging between 1060 and 2470 kg m−2 year−1 from 2008 to 2014. The combination of ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice The Cryosphere Unknown Antarctic Antarctic Peninsula The Antarctic The Cryosphere 12 3 1069 1090 |
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fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir F. Fernandoy D. Tetzner H. Meyer G. Gacitúa K. Hoffmann U. Falk F. Lambert S. MacDonell New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies |
topic_facet |
geo envir |
description |
Due to recent atmospheric and oceanic warming, the Antarctic Peninsula is one of the most challenging regions of Antarctica to understand in terms of both local- and regional-scale climate signals. Steep topography and a lack of long-term and in situ meteorological observations complicate the extrapolation of existing climate models to the sub-regional scale. Therefore, new techniques must be developed to better understand processes operating in the region. Isotope signals are traditionally related mainly to atmospheric conditions, but a detailed analysis of individual components can give new insight into oceanic and atmospheric processes. This paper aims to use new isotopic records collected from snow and firn cores in conjunction with existing meteorological and oceanic datasets to determine changes at the climatic scale in the northern extent of the Antarctic Peninsula. In particular, a discernible effect of sea ice cover on local temperatures and the expression of climatic modes, especially the Southern Annular Mode (SAM), is demonstrated. In years with a large sea ice extension in winter (negative SAM anomaly), an inversion layer in the lower troposphere develops at the coastal zone. Therefore, an isotope–temperature relationship (δ–T) valid for all periods cannot be obtained, and instead the δ–T depends on the seasonal variability of oceanic conditions. Comparatively, transitional seasons (autumn and spring) have a consistent isotope–temperature gradient of +0.69 ‰ °C−1. As shown by firn core analysis, the near-surface temperature in the northern-most portion of the Antarctic Peninsula shows a decreasing trend (−0.33 °C year−1) between 2008 and 2014. In addition, the deuterium excess (dexcess) is demonstrated to be a reliable indicator of seasonal oceanic conditions, and therefore suitable to improve a firn age model based on seasonal dexcess variability. The annual accumulation rate in this region is highly variable, ranging between 1060 and 2470 kg m−2 year−1 from 2008 to 2014. The combination of ... |
format |
Article in Journal/Newspaper |
author |
F. Fernandoy D. Tetzner H. Meyer G. Gacitúa K. Hoffmann U. Falk F. Lambert S. MacDonell |
author_facet |
F. Fernandoy D. Tetzner H. Meyer G. Gacitúa K. Hoffmann U. Falk F. Lambert S. MacDonell |
author_sort |
F. Fernandoy |
title |
New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies |
title_short |
New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies |
title_full |
New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies |
title_fullStr |
New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies |
title_full_unstemmed |
New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies |
title_sort |
new insights into the use of stable water isotopes at the northern antarctic peninsula as a tool for regional climate studies |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-1069-2018 https://www.the-cryosphere.net/12/1069/2018/tc-12-1069-2018.pdf https://doaj.org/article/e3f55973780045f9a895ed6a15d5807d |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 12, Pp 1069-1090 (2018) |
op_relation |
doi:10.5194/tc-12-1069-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/1069/2018/tc-12-1069-2018.pdf https://doaj.org/article/e3f55973780045f9a895ed6a15d5807d |
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undefined |
op_doi |
https://doi.org/10.5194/tc-12-1069-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
3 |
container_start_page |
1069 |
op_container_end_page |
1090 |
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1766238102075998208 |