CPD Climate of the Past Discussions CPD 1814-9359 Copernicus GmbH Göttingen, Germany 10.5194/cpd-4-719-2008 Influence of orbital forcing on the seasonality and regionality of the Asian Summer monsoon precipitation Hori M. E. 1 Abe M. 2 Yasunari T. 3 Kitoh A. 4 Graduate School of Environmental Sciences, Nagoya University, Nagoya, Japan National Institute for Environmental Studies, Tsukuba, Japan Hydrosphere/Atmosphere Research Center, Nagoya University, Nagoya, Japan Meteorological Research Institute, Tsukuba, Japan 09 06 2008 4 3 719 740 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.clim-past-discuss.net/4/719/2008/cpd-4-719-2008.html The full text article is available as a PDF file from http://www.clim-past-discuss.net/4/719/2008/cpd-4-719-2008.pdf

The response of Asian monsoon precipitation to contrasting orbital parameters is simulated using the MRI-CGCM climate model. Results show that for the 125 kya B. P. experiment, a large continental heating due to obliquity forcing is apparent and accounts for the strengthened cross equatorial flow, stronger monsoon westerly over the Arabian Sea, and an enhanced precipitation over the Indian subcontinent. For the 115 kya B. P. experiment, while the monsoon westerly becomes weaker in the Arabian Sea, the overall strength of the monsoon westerly becomes stronger in the Bay of Bengal. This eastward extension of the monsoon westerly converges with the equatorial trade wind to give rise to an increased precipitation over the maritime continent and Indochina peninsula. Such increase in precipitation is accompanied with an earlier onset of the Asian monsoon, and an earlier warming of the tropical SST due to precessional forcing. It is concluded that while the obliquity forcing creates the baseline land-sea contrast which maintains the Asian monsoon westerly, when such forcing is comparably weaker, the Indian monsoon is diminished and the precessional forcing becomes more dominating to create a distinct earlier warming of the tropical SST which leads to an earlier onset of the maritime monsoon over the western Pacific. This study implies that even under weaker insolation forcing, the precessional signal may act to enhance certain regional precipitation and onset timing of the Asian monsoon.

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