Astronomical forcing on Eastern and Southern Asia interglacial climates based on modelling results

Lyu, Anqi;Yin, Qiuzhen;Crucifix, Michel;Berger, André;et.al.
(2019) EGU General Assembly 2019 — Location: Vienna, Austria (7.April.2019)

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(en) The long-term orbital changes have been proved to produce changes in global and regional climate, which arereflected in the geological records. However, the relationships between climate and astronomical parameters arenot yet fully understood at regional scale. Here, based on climate model simulations, we study the climate responseof several sub-regions over Eastern and Southern Asia to continuously changing astronomical parameters underinterglacial 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 onan ensemble of well-chosen snapshot simulations by the model HadCM3. Data are obtained under the conditionsthat obliquity is fixed, precession is fixed and all the three parameters vary. The results obtained by the two modelsare generally consistent. Among the three orbital parameters, precession is the main factor regulating temperatureand precipitation, and obliquity is a secondary effect. In general, the relative effects of the three astronomicalparameters are quite similar over the selected sub-regions over Eastern and Southern Asia although differencesexist. In order to quantify the individual and combined effects, more sensitivity experiments and regression analysiswill be carried out.
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Lyu, A., Yin, Q., Crucifix, M., Berger, A., & et al. (2019). Astronomical forcing on Eastern and Southern Asia interglacial climates based on modelling results. Geophysical Research Abstracts, 21(EGU2019-6139). https://hdl.handle.net/2078.5/169292 (Original work published 2019)