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GEOPHYSICAL RESEARCH LETTERS,
VOL. 36,
L11815,
5 PP., 2009
doi:10.1029/2009GL038271
Asian summer monsoon simulated by a global cloud-system-resolving model: Diurnal to intra-seasonal variability
Frontier Research Center for Global Change, Japan Agency for Marine-Earth, Science and Technology, Yokohama, Japan
Frontier Research Center for Global Change, Japan Agency for Marine-Earth, Science and Technology, Yokohama, Japan
Frontier Research Center for Global Change, Japan Agency for Marine-Earth, Science and Technology, Yokohama, Japan
Center for Climate System Research, University of Tokyo, Kashiwa, Japan
International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, USA
International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, USA
Frontier Research Center for Global Change, Japan Agency for Marine-Earth, Science and Technology, Yokohama, Japan
Frontier Research Center for Global Change, Japan Agency for Marine-Earth, Science and Technology, Yokohama, Japan
Hydrospheric Atmospheric Research Center, Nagoya University, Nagoya, Japan
Interaction of convection and circulation is key to the Asian summer monsoon, but difficult to represent in global models. Here we report results from simulations for the summer of 2004 by a global cloud-system-resolving model, NICAM. At both 14- and 7-km horizontal resolution, NICAM simulates the observed monsoon circulation patterns, and the northward propagation of precipitation. The 7-km run simulates summer-mean precipitation maxima in narrow bands along the western Ghats, Himalayan foothills, the Arakan Yoma highlands, and the Annamite range. Precipitation 1) is modulated by orography, 2) is affected by synoptic-scale systems, and 3) displays a pronounced diurnal cycle, especially over Indo-China, with its strong/weak signal propagating westward/eastward in the wet/dry phase of the intraseasonal oscillation. This set of simulations captures these intraseasonal changes of the Indian monsoon with high fidelity from June to early July. NICAM exhibits a positive bias in precipitation over the Indian Ocean, common to atmospheric models with prescribed sea surface temperature. This calls for the inclusion of ocean-atmosphere coupling process to improve monsoon simulation skills.
Received 27 March 2009; accepted 20 May 2009; published 13 June 2009.
Citation: (2009), Asian summer monsoon simulated by a global cloud-system-resolving model: Diurnal to intra-seasonal variability, Geophys. Res. Lett., 36, L11815, doi:10.1029/2009GL038271.
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