Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, 712100, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, 712100, China.
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, 712100, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, 712100, China; College of Agricultural Engineering, Jiangsu University, Zhenjiang, 212013, China.
J Environ Manage. 2021 Apr 1;283:111980. doi: 10.1016/j.jenvman.2021.111980. Epub 2021 Jan 19.
Drought can lead to considerable agricultural, ecological, and societal damage. Improving our understanding of the propagation relationship between meteorological and hydrological drought is necessary to lessen drought impacts. The different drought responses and underlying mechanisms among different climate types are not yet sufficiently understood. By applying the standardized precipitation index and standardized runoff index, we investigated the propagation relationship between meteorological and hydrological drought. Because of short-term response between meteorological and hydrological droughts, the propagation time was considered among time scales of 1-12 months. Wavelet analysis was employed to examine the two types of drought from 1902 to 2014. Our results showed that arid environments had a weaker propagation relationship than moist environments. There was a stronger relationship between the two types of drought in summer and autumn than in spring and winter. The climate was not the only factor impacting drought propagation; land (cover and topographic feature) may also impact propagation time and intensity from meteorological to hydrological drought. This study analyzed and highlighted that the most susceptible regions in China and global scale, respectively. The most susceptible regions were tropical and subtropical Chinese southern zones in China and equatorial and warm temperate climate zones in global; however, arid climate zones showed little interaction between the two kinds of drought. Other factors that impact drought propagation, such as land cover, landforms, and human activity, should be considered in future research.
干旱会导致相当大的农业、生态和社会损失。为了减轻干旱的影响，我们有必要更好地了解气象和水文干旱之间的传播关系。不同气候类型之间的干旱响应和潜在机制还没有得到充分理解。本研究应用标准化降水指数和标准化径流指数，研究了气象和水文干旱之间的传播关系。由于气象和水文干旱之间存在短期响应，因此在 1-12 个月的时间尺度内考虑了传播时间。小波分析用于研究 1902 年至 2014 年期间的这两种干旱。结果表明，干旱环境的传播关系比湿润环境弱。夏季和秋季两种干旱类型之间的关系比春季和冬季强。气候并不是影响干旱传播的唯一因素；土地（覆盖和地形特征）也可能影响从气象到水文干旱的传播时间和强度。本研究分别分析和强调了中国和全球尺度上最易受影响的区域。中国最易受影响的地区是中国南部的热带和亚热带地区以及全球的赤道和暖温带气候区；然而，干旱气候区这两种干旱之间的相互作用较小。在未来的研究中，应考虑影响干旱传播的其他因素，如土地覆盖、地形和人类活动。
