Spatial and temporal distribution of rainfall and drought characteristics across the Pearl River basin
Spatial and temporal distribution of rainfall and drought characteristics across the Pearl River basin
复制标题
珠江流域降雨及干旱特征时空分布
DOI：
10.1016/j.scitotenv.2017.10.339
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发表时间：
2018-04-01
影响因子：
9.8
通讯作者：
Chen, Dong
中科院分区：
文献类型：
--
作者：
Deng, Shulin;Chen, Tan;Chen, Dong
了解降雨趋势和干旱特征在流域开发和管理中起着关键作用。利用珠江流域中国流域48个气象站1959~2012年的气温和降水资料，分析了珠江流域降水和干旱的时空特征。基于标准化降水-蒸散指数(SPEI)，研究了厄尔尼诺-南方涛动(ENSO)和厄尔尼诺-莫多基(ENSO_M)事件对季节性干旱的可能影响。结果表明，大部分地区年降雨量和季节降水量略有减少，少数地区年降水量和季节日降水量集中减少，月降雨量呈不规则分布，但趋势不明显，大部分地区降水季节性增加。近年来，珠江流域特别是上游旱情有加重的趋势，季节性旱情也趋于严重或频繁发生。干旱类型不仅与降雨量的减少趋势有关，还与日降雨量、月降雨量的异质性和降雨量的季节性变化有关。ENSO和ENSO_M事件对中上游夏季干旱均有影响。ENSO事件在珠江三角洲秋旱形势中占主导地位，ENSO_M事件强烈影响了中上游和中下游北部秋旱形势的变化。(C)2017爱思唯尔B.V.保留所有权利。
Understanding rainfall trends as well as drought characteristics plays a key role in watershed development and management. In this study, the spatial and temporal characteristics of rainfall and drought based on temperature and precipitation data observed in 48 meteorological stations from 1959 to 2012 across the Pearl River Basin in China were analyzed. The possible influence of El Nino-Southern Oscillation (ENSO) and El Nino Modoki (ENSO_M) events on seasonal drought based on the Standardized Precipitation-evapotranspiration Index (SPEI) were also investigated. The results show that annual and seasonal rainfall decreased slightly in most areas, annual and seasonal daily precipitation concentration decreased in a few areas, monthly rainfall had an irregular distribution but with no significant trend detected, and rainfall seasonality increased in most areas. Drought tended to worsen during recent years, especially in the upper reaches, and seasonal drought also tended to become serious or occurred frequently across the Pearl River Basin. The drought patterns are not only related to the decreasing trends in rainfall but also to changes in the daily rainfall concentration, monthly rainfall heterogeneity, and rainfall seasonality. Both ENSO and ENSO_M events had an influence on summer drought in the middle-upper reaches. The ENSO events dominated the patterns of autumn drought in the Pearl River Delta, and the ENSO_M events strongly affected the changing patterns of autumn drought in the middle-upper reaches and northern parts of the middle-lower reaches. (c) 2017 Elsevier B.V. All rights reserved.