Influence of global warming and urbanization on regional climate of Megacity: A case study of Chengdu, China

被引：39

作者：

Yuan, Jiacan ^{[1
,2
,3
]}

Lin, Qiyan ^{[1
]}

Chen, Sisi ^{[4
]}

Zhao, Huan ^{[4
]}

Xie, Xin ^{[1
]}

Cai, Ziyi ^{[1
]}

Zhang, Jintao ^{[1
]}

Cheng, Tiantao ^{[1
,2
]}

Hua, Ming ^{[4
]}

Zhang, Renhe ^{[1
,2
,3
]}

机构：

[1] Fudan Univ, Inst Atmospher Sci, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China

[2] Fudan Univ, IRDR Int Ctr Excellence Risk Interconnect & Govern, Shanghai, Peoples R China

[3] Fudan Univ, Shanghai Inst Energy & Carbon Neutral Strategy, Shanghai, Peoples R China

[4] Chengdu Meteorol Bur, Chengdu, Peoples R China

来源：

URBAN CLIMATE | 2022年 / 44卷

基金：

中国国家自然科学基金;

关键词：

Regional climate changes; Weather extremes; Urbanization; Global warming; Megacity; HEAT-STRESS; MODEL; TEMPERATURE; EXTREMES; IMPACTS; AEROSOL; TRENDS; WAVE;

D O I：

10.1016/j.uclim.2022.101227

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Regional climate changes have adverse socioeconomic impacts, especially in a megacity. As a case study, we investigate the regional climate changes of Chengdu, the most densely populated cities in western China. In the past 40 years, Chengdu underwent warming and less humid trends over the entire region. Consistently, the number of annual fog days decreased by-20.5 days/10 years on average, and the frequency of hot extremes increased. The contributions to regional climate changes from global warming and urbanization are investigated, separately. Based on 21 simu-lations from CMIP6 archive, the regional climate changes in Chengdu are projected to increase in temperature, precipitation, hot and precipitation extremes, but decrease in humidity, in response to anthropogenic emissions in greenhouse gases. Simulated by the WRF-Chem model, the regional climate changes due to changes in land usage under urbanization include increase in near-surface temperature, thermal condition, precipitation variability and concentration of PM2.5, but reduction in relative humidity. The spatial pattern of changes depends on seasons and peaks over where the urban build up extends. This study provides comprehensive assessment for regional climate changes, which could inform local planning for adaptation to and mitigation of hetero-geneous climate changes in a megacity like Chengdu.

引用

页数：14

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