10월 26일(금)․고기후학
2007 추계지질과학연합학술대회 초록집
105Was Asia Warmer during the Last Interglacial Maximum than Present?
Seong-Joong Kim
KoreaPolar Research Institute, KORDI, [email protected]
The change in the Asian climate and associated monsoon change during the last interglacial maximum (LIGM) at 125 k yr BP is simulated by the NCAR CCM3. Both modern and 125k BP simulations were forced with contemporary monthly mean sea surface temperatures and the atmospheric carbon dioxide concentration. Orbital parameters (obliquity, precession, and eccentricity) were set to present day for the modern simulation and to 125k BP for the simu- lation of the LIGM. With LIGM orbital parameters, the solar radiation decreases in northern winter and increases in northern summer. The decrease in surface energy in winter leads to a reduction in surface temperature by more than 5°C over the Tibetan Plateau, whereas surface temperature increases in summer by more than 5°C also over Himalaya. The summer surface temperature increase is offset by the wintertime temperature reduction, resulting in the net surface cooling by about 0.7°C in annul-mean over Asia. Despite of the net annu- al-mean cooling, the summer warming leads to the decrease in mean sea level pressure over the Tibetan Plateau, resulting in the increase in landward winds and precipitation. Overall, the annual-mean surface temperature is slightly lower than present in Asia, which is consistent with previous model results.
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