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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/cpd-4-719-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/cpd-4-719-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Jun 2008

09 Jun 2008

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This preprint was under review for the journal CP. A revision for further review has not been submitted.

Influence of orbital forcing on the seasonality and regionality of the Asian Summer monsoon precipitation

M. E. Hori1, M. Abe2, T. Yasunari3, and A. Kitoh4 M. E. Hori et al.
  • 1Graduate School of Environmental Sciences, Nagoya University, Nagoya, Japan
  • 2National Institute for Environmental Studies, Tsukuba, Japan
  • 3Hydrosphere/Atmosphere Research Center, Nagoya University, Nagoya, Japan
  • 4Meteorological Research Institute, Tsukuba, Japan

Abstract. 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.

M. E. Hori et al.

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M. E. Hori et al.

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