Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia
Stable water isotope (δ18O, δD) data from a high elevation (5100 masl) ice core recovered from the Tien Shan Mountains, Kyrgyzstan, display a seasonal cycle in deuterium excess (d = δD − 8*δ18O) related to changes in the regional hydrologic cycle during 1994–2000. While there is a strong correlation...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1540 2023-05-15T16:38:30+02:00 Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia Kreutz, K Wake, Cameron P Aizen, V Cecil, L DeWayne Synal, Hans-Arno 2003-09-01T07:00:00Z application/pdf https://scholars.unh.edu/earthsci_facpub/541 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1540&context=earthsci_facpub unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/541 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1540&context=earthsci_facpub Copyright 2003 by the American Geophysical Union. Earth Sciences Scholarship text 2003 ftuninhampshire 2023-01-30T21:35:33Z Stable water isotope (δ18O, δD) data from a high elevation (5100 masl) ice core recovered from the Tien Shan Mountains, Kyrgyzstan, display a seasonal cycle in deuterium excess (d = δD − 8*δ18O) related to changes in the regional hydrologic cycle during 1994–2000. While there is a strong correlation (r2 = 0.98) between δ18O and δD in the ice core samples, the regression slope (6.9) and mean d value (23.0) are significantly different than the global meteoric water line values. The resulting time-series ice core d profile contains distinct winter maxima and summer minima, with a yearly d amplitude of ∼15–20‰. Local-scale processes that may affect d values preserved in the ice core are not consistent with the observed seasonal variability. Data from Central Asian monitoring sites in the Global Network of Isotopes in Precipitation (GNIP) have similar seasonal d changes. We suggest that regional-scale hydrological conditions, including seasonal changes in moisture source, transport, and recycling in the Caspian/Aral Sea region, are responsible for the observed spatial and temporal d variability. Text ice core University of New Hampshire: Scholars Repository |
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description |
Stable water isotope (δ18O, δD) data from a high elevation (5100 masl) ice core recovered from the Tien Shan Mountains, Kyrgyzstan, display a seasonal cycle in deuterium excess (d = δD − 8*δ18O) related to changes in the regional hydrologic cycle during 1994–2000. While there is a strong correlation (r2 = 0.98) between δ18O and δD in the ice core samples, the regression slope (6.9) and mean d value (23.0) are significantly different than the global meteoric water line values. The resulting time-series ice core d profile contains distinct winter maxima and summer minima, with a yearly d amplitude of ∼15–20‰. Local-scale processes that may affect d values preserved in the ice core are not consistent with the observed seasonal variability. Data from Central Asian monitoring sites in the Global Network of Isotopes in Precipitation (GNIP) have similar seasonal d changes. We suggest that regional-scale hydrological conditions, including seasonal changes in moisture source, transport, and recycling in the Caspian/Aral Sea region, are responsible for the observed spatial and temporal d variability. |
format |
Text |
author |
Kreutz, K Wake, Cameron P Aizen, V Cecil, L DeWayne Synal, Hans-Arno |
spellingShingle |
Kreutz, K Wake, Cameron P Aizen, V Cecil, L DeWayne Synal, Hans-Arno Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia |
author_facet |
Kreutz, K Wake, Cameron P Aizen, V Cecil, L DeWayne Synal, Hans-Arno |
author_sort |
Kreutz, K |
title |
Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia |
title_short |
Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia |
title_full |
Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia |
title_fullStr |
Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia |
title_full_unstemmed |
Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia |
title_sort |
seasonal deuterium excess in a tien shan ice core: influence of moisture transport and recycling in central asia |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2003 |
url |
https://scholars.unh.edu/earthsci_facpub/541 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1540&context=earthsci_facpub |
genre |
ice core |
genre_facet |
ice core |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/541 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1540&context=earthsci_facpub |
op_rights |
Copyright 2003 by the American Geophysical Union. |
_version_ |
1766028783983263744 |