Urban Heat Islands Significantly Reduced by COVID-19 Lockdown

被引：38

作者：

Liu, Zihan ^{[1
]}

Lai, Jiameng ^{[1
]}

Zhan, Wenfeng ^{[1
,2
]}

Bechtel, Benjamin ^{[3
]}

Voogt, James ^{[4
]}

Quan, Jinling ^{[5
]}

Hu, Leiqiu ^{[6
]}

Fu, Peng ^{[7
]}

Huang, Fan ^{[1
]}

Li, Long ^{[1
]}

Guo, Zheng ^{[8
]}

Li, Jiufeng ^{[1
]}

机构：

[1] Nanjing Univ, Int Inst Earth Syst Sci, Jiangsu Prov Key Lab Geog Informat Sci & Technol, Nanjing, Peoples R China

[2] Jiangsu Ctr Collaborat Innovat Geog Informat Reso, Nanjing, Peoples R China

[3] Ruhr Univ Bochum, Dept Geog, Bochum, Germany

[4] Western Univ, Dept Geog, London, ON, Canada

[5] Chinese Acad Sci, State Key Lab Resources & Environm Informat Syst, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China

[6] Univ Alabama Huntsville, Dept Atmospher Sci, Huntsville, AL USA

[7] Univ Illinois, Dept Plant Biol, Urbana, IL USA

[8] Natl Satellite Meteorol Ctr, Beijing, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 02期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

urban heat island; COVID-19; lockdown; thermal remote sensing; land surface temperature; surface air temperature; CLIMATE ZONES; TEMPERATURE; CHINA; WHEAT; CITY; URBANIZATION; PATTERNS; IMPACT; CITIES; AREAS;

D O I：

10.1029/2021GL096842

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The significant reduction in human activities during COVID-19 lockdown is anticipated to substantially influence urban climates, especially urban heat islands (UHIs). However, the UHI variations during lockdown periods remain to be quantified. Based on the MODIS daily land surface temperature and the in-situ surface air temperature observations, we reveal a substantial decline in both surface and canopy UHIs over 300-plus megacities in China during lockdown periods compared with reference periods. The surface UHI intensity (UHII) is reduced by 0.25 (one S.D. = 0.22) K in the daytime and by 0.23 (0.20) K at night during lockdown periods. The reductions in canopy UHII reach 0.42 (one S.D. = 0.26) K in the daytime and 0.39 (0.29) K at night. These reductions are mainly due to the near-unprecedented drop in human activities induced by strict lockdown measures. Our results provide an improved understanding of the urban climate variations during the global pandemic.

引用

页数：10

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