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JIANG Yan, ZHOU Binbin, ZHAN Yanling, et al. 2024. Spatial−Temporal Variation of Rainy Season Precipitation over Jinsha River Basin in Recent 60 Years and the Associated Atmospheric Circulation [J]. Climatic and Environmental Research (in Chinese), 29 (6): 667−680. DOI: 10.3878/j.issn.1006-9585.2023.23049
Citation: JIANG Yan, ZHOU Binbin, ZHAN Yanling, et al. 2024. Spatial−Temporal Variation of Rainy Season Precipitation over Jinsha River Basin in Recent 60 Years and the Associated Atmospheric Circulation [J]. Climatic and Environmental Research (in Chinese), 29 (6): 667−680. DOI: 10.3878/j.issn.1006-9585.2023.23049

Spatial−Temporal Variation of Rainy Season Precipitation over Jinsha River Basin in Recent 60 Years and the Associated Atmospheric Circulation

  • Based on the gridded monthly precipitation data from CN05.1 during 1961−2021, the spatial−temporal characteristics of precipitation anomalies during the rainy season (May to October) over Jinsha River basin and associated atmospheric circulation are analyzed. The results show that the long-term trend of precipitation varies with regions in the basin. Significantly decreasing trend of precipitation can be found in the southern part of upper reaches, middle reaches and southern part of the lower reaches of the basin (region A), and remarkable increasing trend of precipitation can be found in the middle of the upper reaches and the northwestern part of the lower reaches of the basin (region C). Meanwhile, weak and insignificant increasing trend of precipitation can be found in the northernmost part of the upper reaches of the basin (region B). In terms of interannual variation, it is found that precipitation in regions A and C varies in the same phase during 1961−2012, while they are in opposite phase during 2013−2021, which is more prominent for June precipitation. Further composite analysis suggests that, for more (less) June precipitation years, there were cyclonic (anti cyclonic) wind anomalies in the middle and lower troposphere over Jinsha River basin originated from Western Pacific Ocean, while in the upper troposphere there were anticyclonic wind anomalies, which were conducive to excessive precipitation anomalies in the Jinsha River basin. After 2013, in the middle and lower troposphere over the basin, an anomalous anticyclonic wind anomalies in the southern part of the basin can be found, which is originated from the southwest air current from Bay of Bengal, it converged with cyclonic wind anomalous from Okhotsk Sea in the northern part of the basin, and the upper troposphere is controlled by an anomalous anticyclonic circulation, which is conducive to more precipitation in the north of the basin and less precipitation in the south.
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