Preprints
https://doi.org/10.5194/nhess-2022-194
https://doi.org/10.5194/nhess-2022-194
 
22 Jul 2022
22 Jul 2022
Status: this preprint is currently under review for the journal NHESS.

Increased spatial extent and likelihood of compound long-duration dry and hot events in China, 1961–2014

Yi Yang1,2, Douglas Maraun2, Albert Ossó2, and Jianping Tang1 Yi Yang et al.
  • 1School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China
  • 2Wegener Center for Climate and Global Change, University of Graz, Brandhofgasse 5, 8010, Graz, Austria

Abstract. Compound dry and hot events can cause aggregated damage compared with isolated hazards. Although increasing attention has been paid to compound dry and hot events, the persistence of such hazard is rarely investigated. Moreover, little attention has been paid to the simultaneous evolution process of such hazard in space and time. Based on observations during 1961–2014, the spatiotemporal characteristics of compound long-duration dry and hot (LDDH) events in China during the summer season are investigated on both a grid basis and a 3D event basis. Grid-scale LDDH events mainly occur in eastern China, especially over northeastern areas. Most regions have experienced a pronounced increase in the likelihood of LDDH events, which is dominated by increasing temperatures. From a 3D perspective, 146 spatiotemporal LDDH (SLDDH) events are detected and grouped into nine spatial patterns. Over time, there is a significant increase in the frequency and spatial extent of SLDDH. Consistent with the grid-scale LDDH events, hotspots of SLDDH events mainly occur in northern China, such as Northeast, North China and Qinghai clusters, which are accompanied by high occurrence frequency and large affected areas greater than 300,000 km2.

Yi Yang et al.

Status: open (until 02 Sep 2022)

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Yi Yang et al.

Yi Yang et al.

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Short summary
This study quantifies the spatiotemporal variation and characteristics of compound long-duration dry and hot events in China over the 1961–2014 period. The results show that over the past few decades, there has been a substantial increase in the frequency of these compound events across most parts of China, which is dominated by rising temperatures. We detect a strong increase in the spatially contiguous areas experiencing concurrent dry and hot conditions.
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