Development of a novel daily-scale compound dry and hot index and its application across seven climatic regions of China

Wang，Huimin1; Zhang，Gengxi2; Zhang，Shuyu3; Shi，Lijie2; Su，Xiaoling1; Song，Songbai1; Feng，Kai4; Zhang，Te1; Fu，Xiaolei2

2023-05-15

10.1016/j.atmosres.2023.106700

ATMOSPHERIC RESEARCH   Impact Factor & Quartile

0169-8095

1873-2895

Drought and heat waves often occur simultaneously or sequentially within a short period, named compound dry and hot events (CDHEs), enhancing damages caused by individual extremes. Under global warming, occurrences of short-term CDHEs have increased, adversely impacting the ecosystem and society. However, current indicators generally monitor CDHEs at monthly scales, which cannot reflect short-term CDHEs. This study proposes a novel daily-scale compound dry and hot index (DCDHI) by jointing daily Standardized Moisture Anomaly Index (SZI) and Standardized Temperature Index (STI) using Copula. The applicability of daily SZI and DCDHI indices in monitoring droughts and CDHEs is verified across seven climatic regions of China. The daily SZI agrees better with soil moisture variations than the Standardized Precipitation Index (SPI) and Standardized Precipitation and Temperature Index (SPEI) at multiple time scales, indicating it can be applied to construct daily DCDHI for detecting compound dry and hot events. The DCDHI can detect spatial evolutions of dry and hot conditions within a month and reflects vegetation losses, indicating the DCDHI is a good indicator for detecting CDHEs at different time scales. The characteristics of CDHEs during growing seasons (April to October) are also investigated from 1961 to 2021. There is a significant increase in the area affected by CDHEs, which occur more frequently for the period of 1990–2021 than that in 1961–1989. More extreme compound dry and hot events are more likely to occur under global warming. The new tool proposed in this study could detect evolutions and characteristics of short-term CDHEs and provide technical support for the risk management of extreme events.

China Climate change Compound dry and hot events Precipitation Temperature

SCI

English

Others

Natural Science Foundation of Jiangsu Province, China[BK20220590] ; Lanzhou Institute of Arid Meteorology[IAM202119] ; Belt and Road Special Foundation of the Key Laboratory of Hydrology-Water Resourcesand Hydraulic Engineering of Hohai University[2021490611]

Meteorology & Atmospheric Sciences

Meteorology & Atmospheric Sciences

WOS:000955738800001

ELSEVIER SCIENCE INC

GEOSCIENCES

2-s2.0-85149821864

Scopus

1.College of Water Resources and Architectural Engineering,Northwest A & F University,Yangling,712100,China
2.College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou,225009,China
3.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.College of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou,450046,China

Wang，Huimin,Zhang，Gengxi,Zhang，Shuyu,et al. Development of a novel daily-scale compound dry and hot index and its application across seven climatic regions of China[J]. ATMOSPHERIC RESEARCH,2023,287.

Wang，Huimin.,Zhang，Gengxi.,Zhang，Shuyu.,Shi，Lijie.,Su，Xiaoling.,...&Fu，Xiaolei.(2023).Development of a novel daily-scale compound dry and hot index and its application across seven climatic regions of China.ATMOSPHERIC RESEARCH,287.

Wang，Huimin,et al."Development of a novel daily-scale compound dry and hot index and its application across seven climatic regions of China".ATMOSPHERIC RESEARCH 287(2023).