Analysis of dry/wet conditions in the Gan River Basin, China, and their association with large-scale atmospheric circulation
Analysis of dry/wet conditions in the Gan River Basin, China, and their association with large-scale atmospheric circulation
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中国赣河流域干湿状况分析及其与大范围大气环流的关系
DOI：
10.1016/j.gloplacha.2015.09.005
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发表时间：
2015-10
影响因子：
3.9
通讯作者：
Changchun Chen
中科院分区：
文献类型：
--
作者：
Yuqing Zhang;Qinglong You;Houbo Lin;Changchun Chen
干旱和洪水是在特定时期可用水显著低于或高于正常水平时发生的自然现象。近年来，赣江流域经常受到干旱和洪水的威胁，评估该地区的干湿状况特征对于改善该地区的水资源管理和减灾具有重要意义。根据1964-2013年全流域40个气象站的降水和温度资料，利用标准化降水蒸散指数(SPEI)分析了该流域干湿状况的变异性。此外，利用NCEP/NCAR再分析资料计算的标准径流指数(SSI)和大尺度大气环流形势，进一步探讨和评价了流域干湿状况形成的时间变化、空间格局和可能的机制。结果表明，月SSI与SPI之间存在多个时间尺度的稳健系数。在2-3个月的时间尺度上相关系数最好，更好地反映了季节性干湿状况的强度和程度。在旱季(7-9月)和雨季(4-6月)应用3个月的SPI表明，盆地北部容易发生严重的干/湿事件。异常年旱季/雨季组合的差异表明，在异常年的旱季，500hpa高度正距平和极小的水汽通量都会影响盆地，从而导致盆地干旱事件的发生。然而，在异常年的雨季，南方(中国南部)的高压区和北部(蒙古)的低压区引起的位势高度异常，是从孟加拉湾和中国海输送大量水汽的原因。在这种情况下，水汽通量散度的负值主宰了流域，带来了丰富的降水，经常引发灾害性洪水事件。
Droughts and floods are natural phenomena that occur when water availability is significantly below or above normal levels over a specific period. In recent years, the Gan River Basin has frequently been threatened by droughts and floods, and it is important to evaluate the characteristics of dry/wet conditions for better water resource management and disaster mitigation in this region. On the basis of precipitation and temperature data for the period 1964–2013 from 40 meteorological stations across the basin, the variability of dry/wet conditions was analyzed using the standardized precipitation evapotranspiration index (SPEI). In addition, the standardized streamflow index (SSI) and large-scale atmospheric circulation patterns calculated from NCEP/NCAR reanalysis data were used to further explore and evaluate temporal variations, spatial patterns, and possible mechanism responsible for the formation of dry/wet conditions in the basin. The results indicated that robust coefficients between monthly SSI and SPEI exist at multiple timescales. The best correlation coefficients were found at timescales of 2–3 months, which better reflect the intensity and magnitude of seasonal dry/wet conditions. Application of a 3-month SPEI for the dry (July–September) and wet (April–June) seasons indicated that severe dry/wet episodes were easy to occur in the northern part of the basin. The difference between composites of anomalous dry/wet seasons shows that both a positive height anomaly at 500 hPa and a very little water vapor flux influence the basin during the dry season of anomalous years, which can lead to the occurrence of drought events in the basin. However, during the wet season of anomalous years, geopotential height anomalies caused by areas of high pressure in the south (South China Sea) and areas of low pressure in the north (Mongolia), are responsible for the transport of copious amounts of water vapor from both the Bay of Bengal and the South China Sea. Under these conditions, the negative values of water vapor flux divergence dominate the basin and bring abundant precipitation, which often causes calamitous flood events.
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影响因子：
3.4
作者：
Huang, Jin;Sun, Shanlei;Zhang, Jinchi
通讯作者：
Zhang, Jinchi
影响因子：
6.4
作者：
Kai Xu;Dawen Yang;Hanbo Yang;Zhe Li;Yue Qin;Yan Shen
通讯作者：
Kai Xu;Dawen Yang;Hanbo Yang;Zhe Li;Yue Qin;Yan Shen
影响因子：
3.8
作者：
S. Vicente‐Serrano;S. Beguerı́a;J. López‐Moreno;M. Angulo;A. Kenawy
通讯作者：
S. Vicente‐Serrano;S. Beguerı́a;J. López‐Moreno;M. Angulo;A. Kenawy
影响因子：
6.7
作者：
T. Mckee;N. Doesken;J. Kleist
通讯作者：
T. Mckee;N. Doesken;J. Kleist
DOI：
10.1007/s00477-012-0589-6
发表时间：
2013-02-01
影响因子：
4.2
作者：
Du, Juan;Fang, Jian;Shi, Peijun
通讯作者：
Shi, Peijun