Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation
At the East Antarctic deep ice core drilling site Dome C, daily precipitation measurements were initiated in 2006 and are being continued until today. The amounts and stable isotope ratios of the precipitation samples as well as crystal types are determined. Within the measuring period, the two year...
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ftcopernicus:oai:publications.copernicus.org:acp32394 2023-05-15T13:43:09+02:00 Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation Schlosser, Elisabeth Stenni, Barbara Valt, Mauro Cagnati, Anselmo Powers, Jordan G. Manning, Kevin W. Raphael, Marilyn Duda, Michael G. 2018-09-15 application/pdf https://doi.org/10.5194/acp-16-4757-2016 https://www.atmos-chem-phys.net/16/4757/2016/ eng eng doi:10.5194/acp-16-4757-2016 https://www.atmos-chem-phys.net/16/4757/2016/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-16-4757-2016 2019-12-24T09:52:36Z At the East Antarctic deep ice core drilling site Dome C, daily precipitation measurements were initiated in 2006 and are being continued until today. The amounts and stable isotope ratios of the precipitation samples as well as crystal types are determined. Within the measuring period, the two years 2009 and 2010 showed striking contrasting temperature and precipitation anomalies, particularly in the winter seasons. The reasons for these anomalies are analysed using data from the mesoscale atmospheric model WRF (Weather Research and Forecasting Model) run under the Antarctic Mesoscale Prediction System (AMPS). 2009 was relatively warm and moist due to frequent warm air intrusions connected to amplification of Rossby waves in the circumpolar westerlies, whereas the winter of 2010 was extremely dry and cold. It is shown that while in 2010 a strong zonal atmospheric flow was dominant, in 2009 an enhanced meridional flow prevailed, which increased the meridional transport of heat and moisture onto the East Antarctic plateau and led to a number of high-precipitation/warming events at Dome C. This was also evident in a positive (negative) SAM (Southern Annular Mode) index and a negative (positive) ZW3 (zonal wave number three) index during the winter months of 2010 (2009). Changes in the frequency or seasonality of such event-type precipitation can lead to a strong bias in the air temperature derived from stable water isotopes in ice cores. Text Antarc* Antarctic Antarctica ice core Copernicus Publications: E-Journals Antarctic The Antarctic Atmospheric Chemistry and Physics 16 8 4757 4770 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
At the East Antarctic deep ice core drilling site Dome C, daily precipitation measurements were initiated in 2006 and are being continued until today. The amounts and stable isotope ratios of the precipitation samples as well as crystal types are determined. Within the measuring period, the two years 2009 and 2010 showed striking contrasting temperature and precipitation anomalies, particularly in the winter seasons. The reasons for these anomalies are analysed using data from the mesoscale atmospheric model WRF (Weather Research and Forecasting Model) run under the Antarctic Mesoscale Prediction System (AMPS). 2009 was relatively warm and moist due to frequent warm air intrusions connected to amplification of Rossby waves in the circumpolar westerlies, whereas the winter of 2010 was extremely dry and cold. It is shown that while in 2010 a strong zonal atmospheric flow was dominant, in 2009 an enhanced meridional flow prevailed, which increased the meridional transport of heat and moisture onto the East Antarctic plateau and led to a number of high-precipitation/warming events at Dome C. This was also evident in a positive (negative) SAM (Southern Annular Mode) index and a negative (positive) ZW3 (zonal wave number three) index during the winter months of 2010 (2009). Changes in the frequency or seasonality of such event-type precipitation can lead to a strong bias in the air temperature derived from stable water isotopes in ice cores. |
format |
Text |
author |
Schlosser, Elisabeth Stenni, Barbara Valt, Mauro Cagnati, Anselmo Powers, Jordan G. Manning, Kevin W. Raphael, Marilyn Duda, Michael G. |
spellingShingle |
Schlosser, Elisabeth Stenni, Barbara Valt, Mauro Cagnati, Anselmo Powers, Jordan G. Manning, Kevin W. Raphael, Marilyn Duda, Michael G. Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation |
author_facet |
Schlosser, Elisabeth Stenni, Barbara Valt, Mauro Cagnati, Anselmo Powers, Jordan G. Manning, Kevin W. Raphael, Marilyn Duda, Michael G. |
author_sort |
Schlosser, Elisabeth |
title |
Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation |
title_short |
Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation |
title_full |
Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation |
title_fullStr |
Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation |
title_full_unstemmed |
Precipitation and synoptic regime in two extreme years 2009 and 2010 at Dome C, Antarctica – implications for ice core interpretation |
title_sort |
precipitation and synoptic regime in two extreme years 2009 and 2010 at dome c, antarctica – implications for ice core interpretation |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-16-4757-2016 https://www.atmos-chem-phys.net/16/4757/2016/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica ice core |
genre_facet |
Antarc* Antarctic Antarctica ice core |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-16-4757-2016 https://www.atmos-chem-phys.net/16/4757/2016/ |
op_doi |
https://doi.org/10.5194/acp-16-4757-2016 |
container_title |
Atmospheric Chemistry and Physics |
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16 |
container_issue |
8 |
container_start_page |
4757 |
op_container_end_page |
4770 |
_version_ |
1766185235254345728 |