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| Titel |
Relative impact of insolation and the Indo-Pacific warm pool surface temperature on the East Asia summer monsoon during the MIS-13 interglacial |
| VerfasserIn |
Q. Z. Yin, U. K. Singh, A. Berger, Z. T. Guo, M. Crucifix |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 5 ; Nr. 10, no. 5 (2014-09-01), S.1645-1657 |
| Datensatznummer |
250117046
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| Publikation (Nr.) |
 copernicus.org/cp-10-1645-2014.pdf |
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| Zusammenfassung |
| During Marine Isotope Stage (MIS)-13, an interglacial about 500 000 years
ago, the East Asian summer monsoon (EASM) was suggested exceptionally strong
by different proxies in China. However, MIS-13 is a weak interglacial in
marine oxygen isotope records and has relatively low CO2 and CH4
concentrations compared to other interglacials of the last 800 000 years. In
the meantime, the sea surface temperature (SST) reconstructions have shown that
the warm pool was relatively warm during MIS-13. Based on climate modeling
experiments, this study aims at investigating whether a warmer Indo-Pacific
warm pool (IPWP) can explain the exceptionally strong EASM occurring during
the relatively cool interglacial MIS-13. The relative contributions of
insolation and of the IPWP SST as well as their synergism are quantified
through experiments with the Hadley Centre atmosphere model, HadAM3, and using
the factor separation technique. The SST of the IPWP has been increased based
on geological reconstructions. Our results show that the pure impact of a
strong summer insolation contributes to strengthen significantly the summer
precipitation in northern China but only little in southern China. The pure
impact of enhanced IPWP SST reduces, slightly, the summer precipitation in
both northern and southern China. However, the synergism between insolation
and enhanced IPWP SST contributes to a large increase of summer precipitation
in southern China but to a slight decrease in northern China. Therefore, the
ultimate role of enhanced IPWP SST is to reinforce the impact of insolation
in southern China but reduce its impact in northern China. We conclude that a
warmer IPWP helps to explain the strong MIS-13 EASM precipitation in
southern China as recorded in proxy data, but another explanation is needed for
northern China. |
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