摘要
基于1981─2020年河北省138个气象站点的逐月降水和气温数据,计算了不同时间尺度的标准化降水蒸散指数(SPEI),并利用Sen趋势分析、Mann-Kendall检验及反距离权重插值等方法,分析了河北省近40年干旱的时空变化特征。结果表明:1981─2020年河北省月、季、年尺度的SPEI值均呈下降趋势,且随着时间尺度的加大,发生干旱的频率下降,持续时间延长。春季、夏季和年际的SPEI值均呈下降趋势,秋季和冬季的SPEI值均呈上升趋势。2016─2020、2011─2020年春季和冬季均处于变湿状态,夏季和秋季均处于变干状态。2011─2020年河北省大部分地区呈干旱状态。不同年代季尺度和年尺度的干旱频率整体上呈增加趋势。河北省发生的轻、中度干旱事件多于重度以上干旱事件。20世纪90年代、21世纪10年代SPEI值减少区域的占比大。20世纪80年代、21世纪00年代SPEI值增加区域的占比大。
Based on monthly precipitation and temperature data of 138 meteorological stations in Hebei Province from 1981 to 2020,the standardized precipitation evapotranspiration index(SPEI)for different time scales was calculated,and Sen trend analysis,Mann-Kendall test and inverse distance weight interpolation methods were used to analyze the spatiotemporal variation characteristics of drought in Hebei Province in the past 40 years.The results show that the monthly,quarterly and annual SPEI values in Hebei Province show a downward trend from 1981 to 2020.With the increase of the time scale,the frequency of drought decreases and the duration increases.Spring,summer and interannual SPEI values show a downward trend,The SPEI values in autumn and winter show an upward trend.The spring and winter during 2016~2020 and 2011~2020 are in a humid state,and the summer and autumn are in a dry state.From 2011 to 2020,most areas are in a state of drought.The drought frequency of different seasons and years shows an overall increasing trend.There were more mild and moderate drought events than severe drought events in Hebei Province.The proportion of regions with reduced SPEI values in the 1990s and 2010s is large,and the proportion of regions with increased SPEI values in the 1980s and 2000s is large.
作者
魏丽欣
赵春雷
张良玉
高万泉
王欢
WEI Li-xin;ZHAO Chun-lei;ZHANG Liang-yu;GAO Wan-quan;WANG Huan(Baoding Meteorological Bureau,Baoding 071000,China;Baoding Key Laboratory of Ecological Meteorological Intelligent Monitoring and Service,Baoding 071000,China;Meteorological Science Institute of Hebei Province,Shijiazhuang 050021,China;Key Laboratory of Meteorology and Ecological Environment of Hebei Province,Shijiazhuang 050021,China)
出处
《江西农业学报》
CAS
2024年第1期95-101,共7页
Acta Agriculturae Jiangxi
基金
河北省气象局科技项目(21zc08)。
关键词
河北省
SPEI指数
干旱
变化特征
Hebei Province
SPEI index
Drought
Variation characteristics
