| Abstrakt: |
The topography in the Maritime Continent (MC) has significant impact on climate anomalies in the Asian‐Australian monsoons region. In the present study, the Regional Climate Model Version 4.6 (RegCM4.6) is applied for the simulation of climate over the Asian‐Australian monsoon region during the boreal summer. Results demonstrate that the RegcM4.6 is able to well reproduce precipitation, temperature and low‐level and upper‐level circulation patterns over the Asian‐Australian monsoons region. A sensitivity experiment with zero topographic height in the MC region shows that the intensity of western Pacific subtropical high (WPSH) and Australian cold high both weaken simultaneously, while the cross‐equatorial flows also decline and the East Asian‐Australian monsoons become weaker. Meanwhile, the anomalous cyclonic circulation with significant convergence prevails in lower levels over the western Pacific, leading to more precipitation and higher temperature. In the MC region, there are more precipitation and high temperature in the north while there are less precipitation and low temperature in the south. Temperature increases over a large area from the Yunnan‐Guizhou Plateau to the Loess Plateau but decreases in the southeastern coast of China and eastern India. These results have important implications for better understanding the topographic impact of the MC region on the interaction between the east Asian‐Australian monsoons. Plain Language Summary: In order to explore the impact of topographic height in the MC region on climate in the Asian‐Australian monsoons region, the regional climate model RegCM4.6 is implemented to simulate climate scenarios under different topographic heights. The regional climate model RegCM4.6 exhibits good capability for simulating climatological circulation, temperature and precipitation in the Asian‐Australian monsoons region. When the topographic height is set to zero in the MC region, the western Pacific subtropical high and the Australian High both weaken, leading to the weakening of the East Asian Summer Monsoon and the Australian Winter Monsoon. That is, the existence of the terrain in the MC region faceplates the formation and maintenance of the strong Australian Winter Monsoon and the strong East Asian Summer Monsoon, suggesting that it plays an important role in the interaction between the two hemispheres. Topographic height changes in the MC region have significant impacts on climate in this region. Key Points: The regional climate model RegCM.6 exhibits good capability for simulating climatological circulation, temperature and precipitation in the Asian‐Australian monsoons regionthe existence of the terrain in the MC region faceplates the formation and maintenance of the strong Australian Winter Monsoon and the strong East Asian Summer Monsoon, suggesting that it plays an important role in the interaction between the two hemispheresTopographic height changes in the MC region have significant impacts on climate in many regions [ABSTRACT FROM AUTHOR] |
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