Lengthening Dry Spells Intensify Summer Heatwaves

He，Bin1; Zhong，Ziqian1; Chen，Deliang2; Liu，Junguo3; Chen，Yaning4; Miao，Chiyuan5; Ding，Ruiqiang5; Yuan，Wenping6; Guo，Lanlan5; Huang，Ling7; Hao，Xingming4; Chen，Aifang3

2022-10-16

10.1029/2022GL099647

GEOPHYSICAL RESEARCH LETTERS   Impact Factor & Quartile

0094-8276

1944-8007

A lengthening of dry spells (DSLs) has been reported by some regional studies, but its linkage with heatwaves via the feedback between soil moisture and air temperature is still not clear on the global and continental scales. Here we examine increases in the length of DSLs during summer over the global continents using in situ precipitation records. Globally, the average DSL has increased by 0.46 day/decade since the 1970s along with increased high-pressure anomalies which are found to be an important reason for the intensification of heatwaves as suggested by the robust and widespread relationships between the DSL and heatwave duration and severity in the northern extratropics. The average DSL associated with a heatwave declined over lands, implying a strengthening coupling between precipitation anomalies and heatwaves. The findings of this study suggest that the precipitation variations associated with changes in DSLs should be considered in attributions of temperature extremes.

dry spell heatwave precipitation soil moisture

SCI

English

NI Journal Papers

Others

Chinese Academy of Sciences[XDA20060402];

WOS:000865788300001

GEOSCIENCES

2-s2.0-85139630979

Scopus

1.College of Global Change and Earth System Science,Beijing Normal University,Beijing,China
2.Department of Earth Sciences,Regional Climate Group,University of Gothenburg,Gothenburg,Sweden
3.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
4.State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,China
5.School of Geography,Beijing Normal University,Beijing,China
6.School of Atmospheric Sciences,Sun Yat-Sen University,Guangzhou,China
7.College of Urban and Environmental Sciences,Peking University,Beijing,China

He，Bin,Zhong，Ziqian,Chen，Deliang,et al. Lengthening Dry Spells Intensify Summer Heatwaves[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(19).

He，Bin.,Zhong，Ziqian.,Chen，Deliang.,Liu，Junguo.,Chen，Yaning.,...&Chen，Aifang.(2022).Lengthening Dry Spells Intensify Summer Heatwaves.GEOPHYSICAL RESEARCH LETTERS,49(19).

He，Bin,et al."Lengthening Dry Spells Intensify Summer Heatwaves".GEOPHYSICAL RESEARCH LETTERS 49.19(2022).