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

Chen Jiadong; Tian Hongwei; Huangjin; Zhang Jinchi

doi:10.13961/j.cnki.stbctb.2021.03.044

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

- Spatial and Temporal Evolution of Inhomogeneity of Intra-annual Precipitation Distribution in He'nan Province During 1970-2019
- Bulletin of Soiland Water Conservation Vol. 41, Issue 3, Pages: 342-349(2021)
- 作者机构：
  
  1. 南京林业大学南方现代林业协同创新中心, 江苏省水土保持与生态修复重点实验室,江苏,南京,210037
  2. 中国气象局/河南省农业气象保障与应用技术重点实验室,河南,郑州,450003
  3. 河南省气象科学研究所,河南,郑州,450003
  4. 南京信息工程大学应用气象学院,江苏,南京,210044
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2021.03.044
  CLC： P426.614
- Published：2021
- 稿件说明：
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Chen Jiadong, Tian Hongwei, Huangjin, et al. Spatial and Temporal Evolution of Inhomogeneity of Intra-annual Precipitation Distribution in He'nan Province During 1970-2019[J]. Bulletin of Soiland Water Conservation, 2021, 41(3): 342-349.
DOI：

Chen Jiadong, Tian Hongwei, Huangjin, et al. Spatial and Temporal Evolution of Inhomogeneity of Intra-annual Precipitation Distribution in He'nan Province During 1970-2019[J]. Bulletin of Soiland Water Conservation, 2021, 41(3): 342-349. DOI： 10.13961/j.cnki.stbctb.2021.03.044.

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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