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Urbanization-induced urban heat island and aerosol effects on climate extremes in the Yangtze River Delta region of China
by
Yan, Huiping
, Zhao, Chun
, Yang, Xiu-Qun
, Leung, Ruby
, Wang, Hailong
, Qian, Yun
, Zhong, Shi
, Yang, Ben
, Fan, Jiwen
, Liu, Dongqing
in
Aerosol effects
/ Aerosol effects on climate
/ Aerosols
/ Air pollution
/ Air temperature
/ Atmospheric aerosols
/ Atmospheric boundary layer
/ Atmospheric heating
/ Atmospheric precipitations
/ Atmospheric stability
/ Boundary conditions
/ Canopies
/ Cities
/ Climate
/ Climate effects
/ Climatic extremes
/ Climatology
/ Clouds
/ Clusters
/ Computer simulation
/ Convection
/ Convection cooling
/ Convection heating
/ Convection modes
/ Convergence
/ Cooling
/ Emissions
/ Environmental aspects
/ ENVIRONMENTAL SCIENCES
/ Extreme weather
/ Heat
/ Heat stress
/ Heat tolerance
/ Heat waves
/ Land cover
/ Land pollution
/ Land use
/ Mean precipitation
/ Megacities
/ Plant cover
/ Pollutants
/ Precipitation
/ Radiative forcing
/ Rain
/ Rainfall
/ Regional climates
/ Rivers
/ Short wave radiation
/ Simulation
/ Solar radiation
/ Spatial analysis
/ Stress
/ Stresses
/ Summer
/ Summer precipitation
/ Surface cooling
/ Surface stability
/ Surface temperature
/ Surface-air temperature relationships
/ Synoptic conditions
/ Temperature effects
/ Temperature rise
/ UCM
/ Updraft
/ Urban areas
/ urban canopy model
/ Urban heat islands
/ Urbanization
/ Weather
/ Weather patterns
/ Wind
/ Winds
/ Winter
/ WRF-Chem
/ Yangtze River Delta
/ YRD
2017
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Urbanization-induced urban heat island and aerosol effects on climate extremes in the Yangtze River Delta region of China
by
Yan, Huiping
, Zhao, Chun
, Yang, Xiu-Qun
, Leung, Ruby
, Wang, Hailong
, Qian, Yun
, Zhong, Shi
, Yang, Ben
, Fan, Jiwen
, Liu, Dongqing
in
Aerosol effects
/ Aerosol effects on climate
/ Aerosols
/ Air pollution
/ Air temperature
/ Atmospheric aerosols
/ Atmospheric boundary layer
/ Atmospheric heating
/ Atmospheric precipitations
/ Atmospheric stability
/ Boundary conditions
/ Canopies
/ Cities
/ Climate
/ Climate effects
/ Climatic extremes
/ Climatology
/ Clouds
/ Clusters
/ Computer simulation
/ Convection
/ Convection cooling
/ Convection heating
/ Convection modes
/ Convergence
/ Cooling
/ Emissions
/ Environmental aspects
/ ENVIRONMENTAL SCIENCES
/ Extreme weather
/ Heat
/ Heat stress
/ Heat tolerance
/ Heat waves
/ Land cover
/ Land pollution
/ Land use
/ Mean precipitation
/ Megacities
/ Plant cover
/ Pollutants
/ Precipitation
/ Radiative forcing
/ Rain
/ Rainfall
/ Regional climates
/ Rivers
/ Short wave radiation
/ Simulation
/ Solar radiation
/ Spatial analysis
/ Stress
/ Stresses
/ Summer
/ Summer precipitation
/ Surface cooling
/ Surface stability
/ Surface temperature
/ Surface-air temperature relationships
/ Synoptic conditions
/ Temperature effects
/ Temperature rise
/ UCM
/ Updraft
/ Urban areas
/ urban canopy model
/ Urban heat islands
/ Urbanization
/ Weather
/ Weather patterns
/ Wind
/ Winds
/ Winter
/ WRF-Chem
/ Yangtze River Delta
/ YRD
2017
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Urbanization-induced urban heat island and aerosol effects on climate extremes in the Yangtze River Delta region of China
by
Yan, Huiping
, Zhao, Chun
, Yang, Xiu-Qun
, Leung, Ruby
, Wang, Hailong
, Qian, Yun
, Zhong, Shi
, Yang, Ben
, Fan, Jiwen
, Liu, Dongqing
in
Aerosol effects
/ Aerosol effects on climate
/ Aerosols
/ Air pollution
/ Air temperature
/ Atmospheric aerosols
/ Atmospheric boundary layer
/ Atmospheric heating
/ Atmospheric precipitations
/ Atmospheric stability
/ Boundary conditions
/ Canopies
/ Cities
/ Climate
/ Climate effects
/ Climatic extremes
/ Climatology
/ Clouds
/ Clusters
/ Computer simulation
/ Convection
/ Convection cooling
/ Convection heating
/ Convection modes
/ Convergence
/ Cooling
/ Emissions
/ Environmental aspects
/ ENVIRONMENTAL SCIENCES
/ Extreme weather
/ Heat
/ Heat stress
/ Heat tolerance
/ Heat waves
/ Land cover
/ Land pollution
/ Land use
/ Mean precipitation
/ Megacities
/ Plant cover
/ Pollutants
/ Precipitation
/ Radiative forcing
/ Rain
/ Rainfall
/ Regional climates
/ Rivers
/ Short wave radiation
/ Simulation
/ Solar radiation
/ Spatial analysis
/ Stress
/ Stresses
/ Summer
/ Summer precipitation
/ Surface cooling
/ Surface stability
/ Surface temperature
/ Surface-air temperature relationships
/ Synoptic conditions
/ Temperature effects
/ Temperature rise
/ UCM
/ Updraft
/ Urban areas
/ urban canopy model
/ Urban heat islands
/ Urbanization
/ Weather
/ Weather patterns
/ Wind
/ Winds
/ Winter
/ WRF-Chem
/ Yangtze River Delta
/ YRD
2017
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Urbanization-induced urban heat island and aerosol effects on climate extremes in the Yangtze River Delta region of China
Journal Article
Urbanization-induced urban heat island and aerosol effects on climate extremes in the Yangtze River Delta region of China
2017
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Overview
The WRF-Chem model coupled with a single-layer urban canopy model (UCM) is integrated for 5 years at convection-permitting scale to investigate the individual and combined impacts of urbanization-induced changes in land cover and pollutant emissions on regional climate in the Yangtze River Delta (YRD) region in eastern China. Simulations with the urbanization effects reasonably reproduced the observed features of temperature and precipitation in the YRD region. Urbanization over the YRD induces an urban heat island (UHI) effect, which increases the surface temperature by 0.53 °C in summer and increases the annual heat wave days at a rate of 3.7 d yr−1 in the major megacities in the YRD, accompanied by intensified heat stress. In winter, the near-surface air temperature increases by approximately 0.7 °C over commercial areas in the cities but decreases in the surrounding areas. Radiative effects of aerosols tend to cool the surface air by reducing net shortwave radiation at the surface. Compared to the more localized UHI effect, aerosol effects on solar radiation and temperature influence a much larger area, especially downwind of the city cluster in the YRD. Results also show that the UHI increases the frequency of extreme summer precipitation by strengthening the convergence and updrafts over urbanized areas in the afternoon, which favor the development of deep convection. In contrast, the radiative forcing of aerosols results in a surface cooling and upper-atmospheric heating, which enhances atmospheric stability and suppresses convection. The combined effects of the UHI and aerosols on precipitation depend on synoptic conditions. Two rainfall events under two typical but different synoptic weather patterns are further analyzed. It is shown that the impact of urban land cover and aerosols on precipitation is not only determined by their influence on local convergence but also modulated by large-scale weather systems. For the case with a strong synoptic forcing associated with stronger winds and larger spatial convergence, the UHI and aerosol effects are relatively weak. When the synoptic forcing is weak, however, the UHI and aerosol effects on local convergence dominate. This suggests that synoptic forcing plays a significant role in modulating the urbanization-induced land-cover and aerosol effects on individual rainfall event. Hence precipitation changes due to urbanization effects may offset each other under different synoptic conditions, resulting in little changes in mean precipitation at longer timescales.
Publisher
Copernicus GmbH,Copernicus Publications, EGU,Copernicus Publications
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