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| Titel |
Effects of changes in moisture source and the upstream rainout on stable isotopes in precipitation – a case study in Nanjing, eastern China |
| VerfasserIn |
Y. Tang, H. Pang, W. Zhang, Y. Li, S. Wu, S. Hou |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 10 ; Nr. 19, no. 10 (2015-10-22), S.4293-4306 |
| Datensatznummer |
250120833
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| Publikation (Nr.) |
 copernicus.org/hess-19-4293-2015.pdf |
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| Zusammenfassung |
| In the Asian monsoon region, variations in the stable isotopic composition of
speleothems have often been attributed to the "amount effect". However, an
increasing number of studies suggest that the "amount effect" in local
precipitation is insignificant or even non-existent. To explore this issue
further, we examined the variability of daily stable isotopic composition
(δ18O) in precipitation from September 2011 to November 2014 in
Nanjing, eastern China. We found that intra-seasonal variations of
δ18O during summer were not significantly correlated with local
rainfall amount but could be linked to changes in the moisture source
location and rainout processes in the source regions. Our findings suggest
that the stable isotopes in summer precipitation could signal the location
shift of precipitation source regions in the inter-tropical convergence zone
(ITCZ) over the course of the monsoon season. As a result, changes in
moisture source location and upstream rainout effect should be taken into
account when interpreting the stable isotopic composition of speleothems in
the Asian monsoon region. In addition, the temperature effect on isotopic
variations in non-monsoonal precipitation should also be considered because
precipitation in the non-monsoon season accounts for about half of its annual
precipitation. |
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