标题: Developing a novel framework to re-examine half a century of compound drought and heatwave events in mainland China

作者: Zhao, L (Zhao, Lin); Li, XX (Li, Xinxin); Zhang, ZJ (Zhang, Zhijiang); Yuan, MX (Yuan, Moxi); Sun, S (Sun, Shao); Qu, S (Qu, Sai); Hou, MJ (Hou, Mengjie); Lu, D (Lu, Dan); Zhou, YJ (Zhou, Yajuan); Lin, AW (Lin, Aiwen)

来源出版物: SCIENCE OF THE TOTAL ENVIRONMENT卷: 874文献号: 162366 DOI: 10.1016/j.scitotenv.2023.162366提前访问日期: MAR 2023出版年: MAY 20 2023

摘要: Compound drought and heatwave events (CDHEs) are more devastating than single drought or heatwave events and have gained widespread attention. However, previous studies have not investigated the impacts of the precipitation attenuation effect (PAE) (i.e., the effect of previous precipitation on the dryness and wetness of the current system is attenuated) and event merging (EM) (i.e., merging two CDHEs with short intervals into a single event). Moreover, few studies have assessed short-term CDHEs within monthly scales and their variation characteristics under different background temperatures. Here we propose a novel framework for assessing CDHEs on a daily scale and considering the PAE and EM.We applied this framework to mainland China and investigated the spatiotemporal variation of the CDHE indicators (spatial extent (CDHEspa), frequency (CDHEfre), duration (CHHEdur), and severity (CDHEsev)) from 1968 to 2019. The results suggested that ignoring the PAE and EM led to significant changes in the spatial distribution and magnitude of the CDHE indicators. Daily-scale assessments allowed for monitoring the detailed evolution of CDHEs and facilitated the timely development of mitigation measures. Mainland China experienced frequent CDHEs from 1968 to 2019 (except for the southwestern part of Northwest China (NWC) and the western part of Southwest China (SWC)), whereas, hotspot areas of CDHEdurand CDHEsev had a patchy distribution in different geographical subregions. The CDHE indicators were higher in the warmer 1994-2019 period than in the colder 1968-1993 period, but the rate of increase of the indicators was lower or there was a downward trend. Overall, CDHEs in mainland China have been in a state of remarkable continuous strengthening over the past half a century. This study provides a new quantitative analysis approach for CDHEs.

作者关键词: CDHEs; Precipitation attenuation effect; Event merging; Daily scale assessment

地址: [Zhao, Lin; Li, Xinxin; Qu, Sai; Hou, Mengjie; Lu, Dan; Zhou, Yajuan; Lin, Aiwen] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

[Zhang, Zhijiang] Suzhou Univ Sci & Technol, Sch Geog Sci & Geomat Engn, Suzhou 215009, Peoples R China.

[Yuan, Moxi] Hunan Univ Technol & Business, Sch Publ Adm & Human Geog, Changsha 410205, Peoples R China.

[Sun, Shao] Chinese Acad Meteorol Sci, State Key Lab Severe Weather LASW, Beijing 100081, Peoples R China.

通讯作者地址: Li, XX (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

电子邮件地址:lixinxin_better@whu.edu.cn

影响因子：10.754