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Spatial Distribution and Temporal Trends in the Daily Precipitation Concentration across the Yarlung Tsangpo River Basin: Eastern Himalaya of China
Advances in Meteorology ( IF 2.9 ) Pub Date : 2020-12-15 , DOI: 10.1155/2020/8813394
Mengtao Zhu 1 , Meng Li 2 , Chunyu Liu 1 , Yinfei Wang 1 , Jiqiu Li 1 , Yungang Li 1, 3
Affiliation  

Understanding the temporal inequality in precipitation is of great importance for water resource management, environmental risk management, and ecological conservation. This study investigated the spatial patterns and trends of the daily precipitation concentration over the Yarlung Tsangpo River Basin using the concentration index (CI) and the Lorentz asymmetric coefficient (LAC). A Mann–Kendall test and Hurst’s rescaled range analysis were used to detect the change in CI trends. The CI ranged from 0.58 to 0.65, suggesting that a quarter of the rainiest days contributed approximately 69–78% of the total precipitation. The LAC analysis indicated that the nonuniform distribution of precipitation was mainly attributed to a large proportion of days with light rainfall. Compared with that of the central region, the daily precipitation in the western and eastern regions was more irregular. At a seasonal scale, the dry season had a less homogeneous spatial distribution of CI compared to that of the wet season. Most areas exhibited no significant trends in CI from 1970 to 2017. A quarter of the stations presented a significant downward trend in CI, which were primarily found in the central and northern regions. In addition, the future trends of CI in most areas mostly agree with those of the current state; however, the majority of stations exhibited an uneven precipitation distribution in the dry season.

中文翻译:

喜马拉雅东部雅鲁藏布江流域日降水量集中的时空分布

了解降水的时间不平等性对水资源管理,环境风险管理和生态保护具有重要意义。本研究利用浓度指数(CI)和洛仑兹不对称系数(LAC)研究了雅鲁藏布江流域日降水浓度的空间格局和趋势。使用Mann-Kendall检验和Hurst的重新定标范围分析来检测CI趋势的变化。CI的范围从0.58到0.65,表明四分之一的多雨天贡献了大约69-78%的总降水量。LAC分析表明,降水量的不均匀分布主要归因于大部分时间有小雨。与中部地区相比 西部和东部地区的日降水量较为不规则。在季节尺度上,与湿季相比,旱季的CI空间分布较不均匀。从1970年到2017年,大多数地区的CI都没有显着变化。四分之一的台站的CI呈明显下降趋势,主要分布在中部和北部地区。此外,CI在大多数领域的未来趋势与当前状态基本一致。但是,大多数台站在旱季降水分布不均。四分之一的台站的CI呈显着下降趋势,主要集中在中部和北部地区。此外,CI在大多数领域的未来趋势与当前状态基本一致。但是,大多数台站在旱季降水分布不均。四分之一的台站的CI呈显着下降趋势,主要集中在中部和北部地区。此外,CI在大多数领域的未来趋势与当前状态基本一致。但是,大多数台站在旱季降水分布不均。
更新日期:2020-12-15
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