基于PDSI的1982—2015年我国气象干旱特征及时空变化分析
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P426.616

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“十三五”国家重点研发项目(2018YFC1508101);江苏省杰出青年基金(BK20180022);江苏省“六大人才高峰”项目(NY-004);江苏省水利科技项目(2018055)


PDSI-based analysis of characteristics and spatiotemporal changes of meteorological drought in China from 1982 to 2015
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    摘要:

    利用中国地面气象观测的月值资料构建1982—2015年月尺度帕默尔干旱指数(PDSI)来度量中国气象干旱,并对气象干旱特征和时空变化规律进行分析。结果表明:我国气象干旱特征空间差异显著,半湿润、半干旱区平均干旱历时较长,烈度较大;从全国整体来看,单位面积上干旱频率为0.44次/a,平均干旱历时6月/次。气象干旱特征变化明显,干旱频次、历时和烈度呈上升趋势,半湿润、半干旱区干旱形势逐渐严峻。气象干旱时空变化显著,年际性、季节性PDSI均呈下降趋势,气象干旱总体呈加重趋势,集中在半湿润、半干旱区(青海东南部、陕甘宁、山西、内蒙古北部及黑龙江北部区域),部分湿润区(四川中部、重庆、湖北及云贵地区)气象干旱加重趋势同样显著。

    Abstract:

    A monthly Palmer Drought Severity Index(PDSI)from 1982 to 2015was constructed using the monthly data from Chinas surface meteorological observation to measure meteorological drought in China. The characteristics and spatiotemporal changes of meteorological drought were analyzed. The results show that there are significant spatial differences in the characteristics of meteorological drought in China with long average droughtduration and high intensityin semi-humid and semi-arid regions. Across the country as a whole, the drought frequency per unit area is 0. 44 times per year and the average drought duration is 6 months per time. The characteristics of meteorological drought have changed significantly and the frequency, duration and intensity of drought present an upward trend. The drought situation in semi-humid and semi-arid regions has gradually become severe. The meteorological drought has significant spatiotemporal changes with interannual and seasonal PDSI all showing a downward trend. The meteorological drought is generally aggravating concentrated in semi-humid and semi-arid regions such as Southeastern Qinghai, Shaanxi-Gansu-Ningxia, Shanxi, Northern Inner Mongolia and Northern Heilongjiang. In some humid regions such as Central Sichuan, Chongqing, Hubei, and Yunnan-Guizhou areas, the trend of aggravation is also significant.

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陶然,张珂.基于PDSI的1982—2015年我国气象干旱特征及时空变化分析[J].水资源保护,2020,36(5):50-56.(TAO Ran, ZHANG Ke. PDSI-based analysis of characteristics and spatiotemporal changes of meteorological drought in China from 1982 to 2015[J]. Water Resources Protection,2020,36(5):50-56.(in Chinese))

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  • 收稿日期:2020-02-23
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  • 在线发布日期: 2020-09-29
  • 出版日期: 2020-09-20