1970-2019年河南省年内降水分配非均匀性的时空演变
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P426.614

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中国气象局/河南省农业气象保障与应用技术重点实验室开放研究资助项目“基于市级尺度河南省主要粮油作物气象年景对大气环流指数的响应”(AFM202006);江苏省农业科技自主创新项目“典型困难立地生态经济防护林营建技术方案”[CX(17)1004]


Spatial and Temporal Evolution of Inhomogeneity of Intra-annual Precipitation Distribution in He'nan Province During 1970-2019
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    摘要:

    [目的] 分析河南省年内降水分配非均匀性的时空演变规律,为区域水资源管理提供依据。[方法] 依托河南省113个气象站1970—2019年逐月降水数据,评估了降水季节性指数(PSI)的时空变化。[结果] ①PSI的空间分布表明河南省北部呈现出较高的降水非均匀性,超过28%的降水集中在7月;②基于主成分分析,河南省可以划分为4个呈现不同PSI演变特征的子区域,分别为西部、中东部、北部、南部;③西部、中东部、及南部地区的PSI在1990年后呈现出一定的上升趋势,而北部地区PSI呈现出更为强烈的短期振荡;④河南省大部分地区PSI的年代际变化主要受厄尔尼诺/南方涛动(ENSO)影响;⑤与其他粮油作物相比,冬小麦产量的年际波动对PSI更为敏感。[结论] 河南省年内降水分配的时空变异性较强,其与大尺度环流信号的相关性存在显著的区域差异。

    Abstract:

    [Objective] The spatio-temporal variability for inhomogeneity of intra-annual precipitation distribution was analyzed in order to provide the basis for regional water resource management. [Methods] Based on monthly precipitation data during 1970—2019 at 113 stations in He’nan Province, spatio-temporal variability of the precipitation seasonality index (PSI) was evaluated. [Results] ① The spatial distribution of PSI showed that North He’nan Province had higher precipitation inheterogeneity, and more than 28% of precipitation occurred in July; ② He’nan Province could be divided into four sub-regions with different temporal variations in PSI (west, central-east, north, and south areas) by using principal component analysis; ③ After 1990, PSI in west, central-east, and South He’nan Province showed a certain upward trend, while PSI in North He’nan Province showed a stronger short-term oscillation; ④ The interdecadal changes of PSI in most areas of He’nan Province were mainly influenced by ENSO; ⑤ The inter-annual fluctuation of winter wheat yield was more sensitive to PSI than the yield of other grain and oil crops. [Conclusion] The spatial-temporal variability of intra-annual precipitation distribution in He’nan Province was strong, and there were significant regional differences in the correlation between intra-annual distribution and large-scale circulation signals.

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陈家栋,田宏伟,黄进,张金池.1970-2019年河南省年内降水分配非均匀性的时空演变[J].水土保持通报,2021,41(3):342-349

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  • 收稿日期:2021-02-06
  • 最后修改日期:2021-03-23
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  • 在线发布日期: 2021-07-08
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