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水力发电学报 ›› 2017, Vol. 36 ›› Issue (12): 28-38.doi: 10.11660/slfdxb.20171204

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京津冀地区气象干旱特征及其成因分析

  

  • 出版日期:2017-12-25 发布日期:2017-12-25

Characteristics of meteorological drought in Jing-Jin-Ji area and cause analysis

  • Online:2017-12-25 Published:2017-12-25

摘要: 京津冀地处我国华北平原的北端,是整个区域最干旱地区之一。利用区域16个地面站点气象数据计算逐年、季度的标准化降水蒸散指数(SPEI),分析京津冀年和季节尺度的干旱面积覆盖率、干旱频率,揭示出京津冀近34年干旱时空格局变化规律及其与ENSO(厄尔尼诺–南方涛动)的关系。研究结果表明:年均SPEI值以-0.065/10a的速度递减;各时间尺度干旱面积覆盖率除冬季外均呈不同程度的增长趋势;京津冀各时间尺度年代际空间分布差异显著,1980年代干旱频率和高频干旱覆盖率较大区域主要集中于京津冀西北地区,1990年代分布于京津冀中部及东北地区,而2000年代整体差异较大;ENSO 是造成京津冀干旱灾害的重要原因。

Abstract: Jing-Jin-Ji or Beijing-Tianjin-Hebei area, located in the north of North China Plain, is one of the most arid regions in the North China Plain. In this study, annual and seasonal values of standardized precipitation evapotranspiration index (SPEI) are calculated using meteorological data at 16 gauge stations over this area to analyze the coverage rate and occurrence frequency of drought. We demonstrate the spatial and temporal evolution of drought and its relationship with El Nino-Southern Oscillation (ENSO) in the area in recent 34 years. The results show that in this period, the SPEI values of this area was decreased gradually at a speed of -0.065/10a, and that except for winter season, its drought coverage rates in different time scales showed different increasing rates. And decadal variability in the spatial distribution over Jing-Jin-Ji area was prominent. In the 1980s, its drought coverage rate and occurrence frequency of drought grew in its northwest part; in the 1990s, the growth concentrated on its middle and northeast parts; but in the 2000s, the whole area showed tremendous variations. These drought events are closely related with the ENSO.

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