JpGU-AGU Joint Meeting 2020

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A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS10] Land-Atmosphere interactions and precipitation variations over the Asian monsoon region.

convener:Hiroshi G. Takahashi(Department of Geography, Tokyo Metropolitan University), Hirokazu Endo(Meteorological Research Institute, Japan Meteorological Agency), Shiori Sugimoto(JAMSTEC Japan Agency for Marine-Earth Science and Technology), Hatsuki Fujinami(Nagoya University)

[AAS10-P01] Spatial differences of the Tibetan Plateau monsoon and its application

*Shaobo Zhang1, Xianyu Yang1, Yong Zhao1 (1.Chengdu University of Information Technology)

Keywords:Tibetan Plateau, sub-area monsoon index, spatial difference, precipitation

As a unique climate phenomenon forced by the Tibetan Plateau (TP) heat flux, the TP monsoon is closely connected with the global climate, especially the East Asian climate. The TP monsoon index, which reflects the TP monsoon extent, has been treated as a useful tool for studying the TP monsoon. In this work, a new TP monsoon index (PMIzhang) was used to analyze the spatial differences among different parts of the TP, explore the relationship between the TP monsoon index and precipitation, and discuss its prediction value. The following conclusions were obtained: PMIzhang had a reversed correlation coefficient with precipitation between the eastern and western parts of the TP, which reflected the first mode of summer precipitation in the TP and showed high consistency with the TP precipitation in terms of interannual and annual variation. When considering the correlation coefficient between the TP monsoon index and precipitation, the result of PMIzhang was a combination of the results of the monsoon index in the northern part of the TP (PMIzhangN) and the southern part of the TP (PMIzhangS). Compared with the southern part of the TP, the northern part of the TP had a stronger surface sensible heat flux, which made the thermal wind characteristics in the region more apparent. As a result, the variation and intensity of PMIzhangN were more evident than that of PMIzhangS. When the PMIzhangN in May positively anomalous, cyclonic circulation anomalies and anticyclonic circulation anomalies could be found in the western part and eastern part of the TP, respectively, leading to positive anomalies and negative anomalies of precipitation in the western part and eastern part of the TP, respectively. Therefore, the interannual variation in the PMIzhangN in May had a proper correlation with the TP summer precipitation, showing its potential application value.