Unprecedented Hot Extremes Observed in City Clusters in China during Summer 2022

Yuan, Yufeng; Liao, Zhen; Zhou, Baiquan; Zhai, Panmao

doi:10.1007/s13351-023-2184-9

Cited by 15 publications

(5 citation statements)

References 29 publications

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“…In July and August of 2022, the YRV experienced an unprecedented heat event, combined with a precipitation deficit, which ultimately drove the occurrence of a severe hydrological drought (Lu et al, 2023;Yuan et al, 2023). This can be seen from the strongest Tmax in July and August and rapid drying of the surface SM (Figs.…”

Section: Unprecedented Heatwave and Drought Along The Yrv In Chinamentioning

confidence: 99%

Understanding and Attribution of Extreme Heat and Drought Events in 2022: Current Situation and Future Challenges

Zhang,

Yu,

Zhou

et al. 2023

Adv. Atmos. Sci.

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Extreme weather events and their consequential impacts have been a key feature of the climate in recent years in many parts of the world, with many partly attributed to ongoing global-scale warming. The past year, 2022, has been no exception, with further records being broken. The year was marked by unprecedented heatwaves and droughts with highly unusual spatial extent, duration and intensity, with one measure indicating an aggregated and overall intensity of extreme heat events worldwide not seen since at least 1950. The extreme drought measured by surface soil moisture covered 47.3% of global land areas in 2022, which was the second most widespread year since 1980. Here, we examine notable events of the year in five major regions of the world: China's Yangtze River region, western Europe, the western U.S., the Horn of Africa and central South America. For each event, we review the potential roles of circulation, oceanic forcing (especially the "triple-dip" La Niña) and anthropogenic climate change, with an aim of understanding the extreme events in 2022 from a global perspective. This will serve as a reference for mechanism understanding, prediction and attribution of extreme events.

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Section: Unprecedented Heatwave and Drought Along The Yrv In Chinamentioning

confidence: 99%

Understanding and Attribution of Extreme Heat and Drought Events in 2022: Current Situation and Future Challenges

Zhang,

Yu,

Zhou

et al. 2023

Adv. Atmos. Sci.

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“…The 2022 Yangtze River mega-flash drought caused a number of societal issues, including crop reduction, wildfires, water and energy supply shortages, and heatwave-related human health issues [8,9]. Moreover, the lakes and reservoirs dried up extensively, resulting in ecological degradations that may require decades to recover [10].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Evolution and Nowcasting of the 2022 Yangtze River Mega-Flash Drought

Liang,

Yuan,

Zhou

et al. 2023

Water

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Flash droughts challenge early warnings due to their rapid onset, which requires a proper drought index and skillful nowcasting system. A few studies have assessed the nowcast skill for flash droughts using a one-dimensional index, but whether the models can capture their spatiotemporal evolution remains unclear. In this study, a three-dimensional meteorological flash drought index based on the percentile of 15-day moving average precipitation minus evapotranspiration (P-ET) is developed. The index is then used to investigate the spatiotemporal evolution of a mega-flash drought that occurred in the Yangtze River basin during the summer of 2022. The results show that the mega-flash drought started at the beginning of July in the upper reaches of the river and expanded to the middle and lower reaches at the beginning of August due to the spread of the high-pressure system. The evolution is well captured by the proposed three-dimensional index. The spatial correlations between the China Meteorological Administration global medium-range ensemble forecast system (CMA-GFS)’s nowcast and reanalysis ranged from 0.58 to 0.85, and the hit rate and equitable threat score are 0.54 and 0.26, respectively. This study shows that the CMA-GFS nowcast of the P-ET index roughly captured the drought’s evolution, which can be used for flash drought early warnings and water resource management.

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“…Many studies have been conducted on extreme temperature indices in relation to China; some were conducted at the national level [19][20][21][22][23], whereas others were conducted at the regional level [24,25]. Generally, the regions considered were either administrative regions (e.g., North China, Northeast China, and East China), or certain key cities or climatecritical regions (e.g., Beijing, Shanghai, and the Tibet Plateau).…”

Section: Introductionmentioning

confidence: 99%

Variations of Extreme Temperature Event Indices in Six Temperature Zones in China from 1961 to 2020

Xin¹,

Zhan²,

Xu³

et al. 2023

Sustainability

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In this study, eight extreme temperature event indices were calculated based on daily maximum, minimum, and mean temperature data recorded at 699 National Reference Stations in China during 1961–2020. The yearly change of mean temperature and the magnitude, frequency, and duration of extreme temperature events in six temperature zones were evaluated. All temperature zones had a trend of an increase in mean temperature (rate: 2.1–3.3 °C per 10 years), and the warming was more significant in the warm temperate zone and the Qinghai–Tibet Plateau zone (QPZ). For extreme temperature events, the extreme maximum and minimum temperatures in most temperature zones showed significant trends of increase, and the rates of increase were greater in the northern zones and QPZ. The rate of increase in extreme minimum temperature was substantially (up to three times) higher than the rate of increase in extreme maximum temperature in the same temperature zone; however, the finding was the opposite for the cold temperate zone (CTZ), which is the northernmost region of China. The rate of increase in extreme maximum temperatures was the greatest (0.35 °C per 10 years), whereas the rate of increase in extreme minimum temperatures was the smallest (0.17 °C per 10 years). The number of warm days/nights and the warm spell duration index also showed significant trends of increase that were most obvious in the southern zones and QPZ. In the tropical zone (TZ), which is the southernmost part of mainland China, the number of warm nights was only 15.3 days in 1961–1970, whereas it increased to 61.9 days in 2011–2020 (an increase of 303.9%). The rate of increase in warm nights in TZ (8.8 days per 10 years) was four times that in CTZ (2.2 days per 10 years). The number of cold days/nights and the cold spell duration index showed significant trends of decrease, with the greatest rates of reduction in QPZ and TZ. In evaluating the frequency of extreme temperature events, the amplitude of warming of the night index was found to be greater than that of the day index. In evaluating the duration of extreme temperature events, the variation of the cold index was found to be greater than that of the warm index. The notable asymmetries found in the variations of the minimum/maximum temperatures, day/night indices, and cold/warm spell durations in China are direct manifestations of global warming.

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Unprecedented Hot Extremes Observed in City Clusters in China during Summer 2022

Cited by 15 publications

References 29 publications

Understanding and Attribution of Extreme Heat and Drought Events in 2022: Current Situation and Future Challenges

Understanding and Attribution of Extreme Heat and Drought Events in 2022: Current Situation and Future Challenges

Spatiotemporal Evolution and Nowcasting of the 2022 Yangtze River Mega-Flash Drought

Variations of Extreme Temperature Event Indices in Six Temperature Zones in China from 1961 to 2020

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