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| Titel |
Influence of regional precipitation patterns on stable isotopes in ice cores from the central Himalayas |
| VerfasserIn |
H. Pang, S. Hou, S. Kaspari, P. A. Mayewski |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 1 ; Nr. 8, no. 1 (2014-02-25), S.289-301 |
| Datensatznummer |
250116023
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| Publikation (Nr.) |
 copernicus.org/tc-8-289-2014.pdf |
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| Zusammenfassung |
| Several ice cores have been recovered from the Dasuopu
(DSP) Glacier and the East Rongbuk (ER) Glacier in the central Himalayas
since the 1990s. Although the distance between the DSP and the ER ice core
drilling sites is only ~ 125 km, the stable isotopic record
(δ18O or δD) of the DSP core is interpreted in previous
studies as a temperature proxy, while the ER core is interpreted as a precipitation proxy.
Thus, the climatological significance of the stable isotopic records of
these Himalayan ice cores remains a subject of debate. Based on analysis of
regional precipitation patterns over the region, we find that remarkable
discrepancy in precipitation seasonality between the two sites may account
for their disparate isotopic interpretations. At the ER core site, the
Indian summer monsoon (ISM) precipitation is dominating due to topographic
blocking of the moisture from westerlies by the high ridges of Mt. Qomolangma
(Everest), which results in a negative correlation between the ER Δ18O or δD record and precipitation amount along the southern
slope of the central Himalayas in response to the "amount effect". At the
DSP core site, in comparison with the ISM precipitation, the wintertime
precipitation associated with the westerlies is likely more important owing
to its local favorable topographic conditions for interacting with the
western disturbances. Therefore, the DSP stable isotopic record may be
primarily controlled by the westerlies. Our results have important
implications for interpreting the stable isotopic ice core records recovered
from different climatological regimes of the Himalayas. |
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