Impacts of Wildfire Aerosols on Global Energy Budget and Climate The Role of Climate Feedbacks

Aerosols emitted from wildfires could significantly affect global climate through perturbing global radiation balance. In this study, the Community Earth System Model with prescribed daily fire aerosol emissions is used to investigate fire aerosols’ impacts on global climate with emphasis on the rol...

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Vydáno v:Journal of climate Ročník 33; číslo 8; s. 3351 - 3366
Hlavní autoři: Jiang, Yiquan, Yang, Xiu-Qun, Liu, Xiaohong, Qian, Yun, Zhang, Kai, Wang, Minghuai, Li, Fang, Wang, Yong, Lu, Zheng
Médium: Journal Article
Jazyk:angličtina
Vydáno: Boston American Meteorological Society 15.04.2020
Témata:
Aerosol effects
aerosol radiative effect
aerosol-cloud interaction
Aerosol-cloud interactions
Aerosols
Air temperature
air-sea interaction
Albedo
Albedo (solar)
Arctic sea ice
Arctic zone
biomass burning
Black carbon
Boreal forests
Cerebral hemispheres
Climate
Climate change
Climate feedback
Cooling
Ecosystems
Emissions
Energy budget
ENVIRONMENTAL SCIENCES
Equator
Feedback
Forest fires
Global aerosols
Global climate
Global precipitation
Global radiation
Heat
Heat flux
Heat transfer
Heat transport
Hemispheric laterality
Ice environments
Intertropical convergence zone
Latent heat
Latent heat flux
Oceans
Precipitation
Radiation
Radiation balance
radiative forcing
Reduction
Regions
Sea ice
Simulation
Southern Hemisphere
Studies
Surface temperature
Surface-air temperature relationships
Tropical climate
Tropical environment
Tropical environments
Wildfires
ISSN:0894-8755, 1520-0442
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Shrnutí:Aerosols emitted from wildfires could significantly affect global climate through perturbing global radiation balance. In this study, the Community Earth System Model with prescribed daily fire aerosol emissions is used to investigate fire aerosols’ impacts on global climate with emphasis on the role of climate feedbacks. The total global fire aerosol radiative effect (RE) is estimated to be −0.78 ± 0.29 W m−2, which is mostly from shortwave RE due to aerosol–cloud interactions (REaci; −0.70 ± 0.20 W m−2). The associated global annual-mean surface air temperature (SAT) change ΔT is −0.64 ± 0.16 K with the largest reduction in the Arctic regions where the shortwave REaci is strong. Associated with the cooling, the Arctic sea ice is increased, which acts to reamplify the Arctic cooling through a positive ice-albedo feedback. The fast response (irrelevant to ΔT) tends to decrease surface latent heat flux into atmosphere in the tropics to balance strong atmospheric fire black carbon absorption, which reduces the precipitation in the tropical land regions (southern Africa and South America). The climate feedback processes (associated with ΔT) lead to a significant surface latent heat flux reduction over global ocean areas, which could explain most (~80%) of the global precipitation reduction. The precipitation significantly decreases in deep tropical regions (5°N) but increases in the Southern Hemisphere tropical ocean, which is associated with the southward shift of the intertropical convergence zone and the weakening of Southern Hemisphere Hadley cell. Such changes could partly compensate the interhemispheric temperature asymmetry induced by boreal forest fire aerosol indirect effects, through intensifying the cross-equator atmospheric heat transport.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
PNNL-SA-150737
USDOE
National Key R&D Program of China
AC05-76RL01830; 2017YFA0604002; 2018YFC1506001; 41621005; 41505062; 41330420
National Natural Science Foundation of China (NNSFC)
ISSN:0894-8755
1520-0442
DOI:10.1175/jcli-d-19-0572.1