Relative Impact of Insolation and Warm Pool surface temperature on the East Asia Summer Monsoon during the MIS-13 interglacial
(2015) 2015 INQUA Congress — Location: Nagoya, Japan (27.July.2015)
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- Abstract
- During the MIS-13 interglacial, the East Asian summer monsoon (EASM) was suggested to be exceptionally strong by different proxy records. 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 show that the Western Pacific Warm Pool was relatively warm during MIS-13. Based on climate modeling experiments, we investigate if the Warm Pool warming can explain the exceptionally strong EASM of MIS-13. The individual contributions of insolation and of the Warm Pool 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 over the Warm Pool region 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 Warm Pool SST reduces, slightly, the summer precipitation in both northern and southern China. However, the synergism between insolation and enhanced Warm Pool SST contributes to a large increase of summer precipitation in southern China but to a decrease in northern China. Therefore, the ultimate role of enhanced Warm Pool SST is to reinforce the impact of insolation in southern China but reduce its impact in northern China. We conclude that enhanced SST over the Warm Pool region does help to explain the strong MIS-13 EASM precipitation in southern China as recorded in proxy data, but other explanation is needed for explaining the exceptionally strong EASM in northern China.
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Yin, Q., Singh, U. K., Berger, A., Guo, Z. T., & Crucifix, M. (2015). Relative Impact of Insolation and Warm Pool surface temperature on the East Asia Summer Monsoon during the MIS-13 interglacial. 2015 INQUA Congress, Nagoya, Japan. https://hdl.handle.net/2078.5/188676