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 |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-12-1069-2018 https://noa.gwlb.de/receive/cop_mods_00006934 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006891/tc-12-1069-2018.pdf https://tc.copernicus.org/articles/12/1069/2018/tc-12-1069-2018.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00006934 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00006934 2023-05-15T13:34:49+02:00 New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies Fernandoy, Francisco Tetzner, Dieter Meyer, Hanno Gacitúa, Guisella Hoffmann, Kirstin Falk, Ulrike Lambert, Fabrice MacDonell, Shelley 2018-03 electronic https://doi.org/10.5194/tc-12-1069-2018 https://noa.gwlb.de/receive/cop_mods_00006934 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006891/tc-12-1069-2018.pdf https://tc.copernicus.org/articles/12/1069/2018/tc-12-1069-2018.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-12-1069-2018 https://noa.gwlb.de/receive/cop_mods_00006934 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006891/tc-12-1069-2018.pdf https://tc.copernicus.org/articles/12/1069/2018/tc-12-1069-2018.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/tc-12-1069-2018 2022-02-08T22:58:46Z 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 isotopic and meteorological data in areas where data exist is key to reconstruct climatic conditions with a high temporal resolution in polar regions where no direct observations exist. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice The Cryosphere Niedersächsisches Online-Archiv NOA Antarctic Antarctic Peninsula The Antarctic The Cryosphere 12 3 1069 1090 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Fernandoy, Francisco Tetzner, Dieter Meyer, Hanno Gacitúa, Guisella Hoffmann, Kirstin Falk, Ulrike Lambert, Fabrice MacDonell, Shelley New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies |
topic_facet |
article Verlagsveröffentlichung |
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 isotopic and meteorological data in areas where data exist is key to reconstruct climatic conditions with a high temporal resolution in polar regions where no direct observations exist. |
format |
Article in Journal/Newspaper |
author |
Fernandoy, Francisco Tetzner, Dieter Meyer, Hanno Gacitúa, Guisella Hoffmann, Kirstin Falk, Ulrike Lambert, Fabrice MacDonell, Shelley |
author_facet |
Fernandoy, Francisco Tetzner, Dieter Meyer, Hanno Gacitúa, Guisella Hoffmann, Kirstin Falk, Ulrike Lambert, Fabrice MacDonell, Shelley |
author_sort |
Fernandoy, Francisco |
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://noa.gwlb.de/receive/cop_mods_00006934 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006891/tc-12-1069-2018.pdf https://tc.copernicus.org/articles/12/1069/2018/tc-12-1069-2018.pdf |
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_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-12-1069-2018 https://noa.gwlb.de/receive/cop_mods_00006934 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006891/tc-12-1069-2018.pdf https://tc.copernicus.org/articles/12/1069/2018/tc-12-1069-2018.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
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 |
_version_ |
1766058136961024000 |