[内蒙古不同水平气象、土壤和水文干旱传播的关系]。

Q3 Environmental Science
Meng-Meng Zhang, En-Liang Guo, Yong-Fang Wang, Yao Kang, Jia-Pei Zhao, Ji-Si-Gu-Leng Wu, Xiao Luo
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引用次数: 0

摘要

了解气象-土壤-水文干旱传播特征可以为制定抗旱措施提供技术支持。以内蒙古为研究区,利用1980 ~ 2022年欧洲中期天气预报中心ERA5-Land土壤水分和地表径流数据集,结合115个气象站的观测资料,计算了内蒙古不同时间尺度的标准化降水蒸散发指数(SPEI)、标准化土壤水分指数(SSI)和标准化径流指数(SRI)。利用运行理论、Theil-Sen中位数趋势分析、Mann-Kendall检验和Pearson相关分析,研究了不同干旱类型间的滞后效应和传播时间的时空分布。结果表明:85%以上的区域呈现出气象、土壤和水文干旱加剧的趋势,显著湿润区占研究区面积的不到1%;气象干旱事件呈现频率高、严重程度低、持续时间短的特征,土壤干旱事件呈现频率低、严重程度高、持续时间长的特征。水文干旱以频率高、严重程度低、持续时间短为主。土壤与水文干旱之间的响应强于气象与水文干旱之间的响应,表明土壤干旱引起的土壤水分亏缺是水文干旱的主要触发因素。不同级别干旱的繁殖时间主要集中在2 ~ 6个月之间,级别越高的干旱事件的过渡和繁殖效率越高。内蒙古中西部地区和东部地区的气象、土壤和水文干旱事件连续性较弱。该研究对揭示区域干旱形成机制和构建干旱传播模型具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Relationship between meteorological, soil, and hydrological drought propagation at different levels in Inner Mongolia, China].

Understanding the meteorological-soil-hydrological drought propagation characteristics can provide technical supports for the formulation of drought mitigation measures. Taking Inner Mongolia as the research area, we utilized the ERA5-Land soil moisture and surface runoff dataset from the European Centre for Medium-Range Weather Forecasts from 1980 to 2022, coupled with observation data from 115 meteorological stations, to calculate standardized precipitation evapotranspiration index (SPEI), standardized soil moisture index (SSI), and standar-dized runoff index (SRI) at different temporal scales. Then, we used run theory, Theil-Sen median trend analysis, the Mann-Kendall test, and Pearson correlation analysis to investigate the lag effects across different types of droughts and the spatiotemporal distribution of propagation time. The results showed that over 85% of the region showed an intensifying trend for meteorological, soil, and hydrological droughts, with areas showing significant wetting covering less than 1% of the study area. Meteorological drought events were characterized by high frequency, low severity, and short duration, whereas soil drought events exhibited low frequency, high severity, and long duration. Hydrological droughts were dominated by high frequency, low severity, and short-duration events. The response between soil and hydrological drought was stronger than that between meteorological and hydrological drought, implicating that soil moisture deficit induced by soil drought was the primary trigger for hydrological drought. The propagation time for various levels of droughts was predominantly concentrated between two to six months, with higher-grade drought events showing more efficient transition and propagation. The continuity of meteo-rological, soil, and hydrological drought events in central and western Inner Mongolia and soil-hydrological drought events in eastern Inner Mongolia were relatively weak. This research would be of great significance in revealing the mechanisms of regional drought formation and constructing drought propagation models.

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来源期刊
应用生态学报
应用生态学报 Environmental Science-Ecology
CiteScore
2.50
自引率
0.00%
发文量
11393
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