Relative effects of precession, obliquity and eccentricity on the interglacial climate over Eastern and Southern Asia
(2019) 20th Congress of the International Union for Quaternary Research (INQUA) — Location: Dublin, Ireland (24.July.2019)
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- Abstract
- The long-term orbital changes have been proved to produce changes in global and regional climate, which are reflected in the geological records. However, how astronomical parameters influence climate is not yet fully understood at regional scale. Here, based on climate model simulations, we study the climate response of several sub-regions over Eastern and Southern Asia to continuously changing astronomical parameters under interglacial conditions (MIS-1, MIS-5, MIS-9, MIS-11 and MIS-19). The outputs are obtained with two methods. The first one is based on the transient simulations using the model LOVECLIM driven by varying insolation forcing (Yin and Berger, 2015). The second one is a Gaussian process emulator (Araya-Melo et al., 2015) calibrated on an ensemble of well-chosen snapshot simulations by the model HadCM3. In order to assess the individual effects of each parameter, data are also obtained when obliquity and precession vary respectively. The results obtained by the two models are generally consistent. Among the three orbital parameters, precession is the main factor regulating temperature and precipitation. In general, the relative effects of the three astronomical parameters are quite similar over the selected sub-regions over Eastern and Southern Asia although differences exist. In the next stage, more sensitivity experiments and regression analysis will be carried out.
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Lyu, A., Yin, Q., Crucifix, M., Berger, A., & et al. (2019). Relative effects of precession, obliquity and eccentricity on the interglacial climate over Eastern and Southern Asia. 20th Congress of the International Union for Quaternary Research (INQUA), Dublin, Ireland. https://hdl.handle.net/2078.5/268379