Dynamics of dry-to-wet abrupt alternation events in mainland China from 1961 to 2022: A novel identification method integrating daily soil moisture and precipitation

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-06-18 DOI:10.1016/j.ejrh.2025.102520

Liaofeng Liang , Jun Xia , Zhonggen Wang

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引用次数: 0

Abstract

Study region

This study focuses on mainland China, covering eight subregions.

Study focus

Dry-to-wet abrupt alternation (DWAA) events have become increasingly frequent worldwide, causing significant socioeconomic and environmental impacts. Current DWAA research overemphasizes monthly precipitation while neglecting soil moisture integration, which reduces predictive accuracy in agricultural and monsoon regions where DWAA occur within a single month. This study addresses these gaps by developing a novel identification method combining daily soil moisture with precipitation data across mainland China (1961–2022). Using data from 2474 meteorological stations and ERA5 reanalysis, we investigated DWAA characteristics and atmospheric circulation patterns across different subregions.

New hydrological insights for the region

Results reveal pronounced regional heterogeneity in DWAA distribution. Northern, Central, and Southern China experienced more frequent events, with Southern China showing the highest station average frequency (24.8 events). Northeastern, Northern China, and Eastern Arid regions displayed higher intensity values, while Southern and Southwestern regions exhibited longer durations. Temporal analysis showed distinct seasonal patterns, with summer DWAA events dominating (35.5 %), significantly exceeding winter (16.7 %) and spring (19.2 %). Atmospheric circulation analysis revealed significant tropospheric reconfigurations characterized by pronounced geopotential height changes at various pressure levels. Water vapor flux analysis identified moisture convergence zones along Southern China and the Yangtze River Basin, exhibiting significant positive anomalies of 0.006–0.012 kg/(m·s), establishing preferential corridors for moisture transport into water-deficient areas.

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1961 - 2022年中国大陆干湿突变事件的动态：一种基于日土壤水分和降水的识别方法

研究区域本研究主要以中国大陆为研究对象，共分八个区域。干湿突变（DWAA）事件在全球范围内日益频繁，造成了重大的社会经济和环境影响。目前的DWAA研究过分强调月降水量，而忽略了土壤湿度的整合，这降低了在单月发生DWAA的农业区和季风区的预测精度。本研究通过开发一种结合中国大陆日土壤湿度和降水数据（1961-2022）的新型识别方法来解决这些空白。利用2474个气象站数据和ERA5再分析，研究了不同区域DWAA特征和大气环流模式。结果表明，DWAA分布具有明显的区域异质性。华北、华中和华南地区出现频率较高，其中华南地区站平均频率最高（24.8次）。东北、华北和东部干旱区表现出较高的强度值，而南部和西南地区表现出较长的持续时间。时间分析显示出明显的季节特征，夏季DWAA事件占主导地位（35.5% %），显著超过冬季（16.7% %）和春季（19.2% %）。大气环流分析显示，在不同气压水平下，以位势高度变化为特征的对流层重构显著。水汽通量分析表明，华南和长江流域水汽辐合带呈显著正异常（0.006 ~ 0.012 kg/(m·s)），为水汽向缺水地区输送建立了优先通道。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.