Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
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
Review status
A revision of this discussion paper 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 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.

Citation: Hori, M. E., Abe, M., Yasunari, T., and Kitoh, A.: Influence of orbital forcing on the seasonality and regionality of the Asian Summer monsoon precipitation, Clim. Past Discuss., 4, 719-740, https://doi.org/10.5194/cpd-4-719-2008, 2008.
M. E. Hori et al.
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC S265: 'Some insolation features', Marie-France Loutre, 25 Jun 2008 Printer-friendly Version 
 
RC S272: 'Improvement needed', Marie-France Loutre, 25 Jun 2008 Printer-friendly Version 
 
RC S505: 'Interesting, but requires major revision', Anonymous Referee #2, 03 Oct 2008 Printer-friendly Version 
M. E. Hori et al.
M. E. Hori et al.

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