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DOI	10.5194/acp-20-13283-2020
	Impact of biomass burning aerosols on radiation, clouds, and precipitation over the Amazon: Relative importance of aerosol-cloud and aerosol-radiation interactions
	Liu L.; Cheng Y.; Wang S.; Wei C.; Pöhlker M.L.; Pöhlker C.; Artaxo P.; Shrivastava M.; Andreae M.O.; Pöschl U.; Su H.
发表日期	2020
ISSN	16807316
起始页码	13283
结束页码	13301
卷号	20 期号:21
英文摘要	Biomass burning (BB) aerosols can influence regional and global climate through interactions with radiation, clouds, and precipitation. Here, we investigate the impact of BB aerosols on the energy balance and hydrological cycle over the Amazon Basin during the dry season. We performed simulations with a fully coupled meteorology-chemistry model, the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem), for a range of different BB emission scenarios to explore and characterize nonlinear effects and individual contributions from aerosol-radiation interactions (ARIs) and aerosol-cloud interactions (ACIs). The ARIs of BB aerosols tend to suppress low-level liquid clouds by local warming and increased evaporation and to facilitate the formation of high-level ice clouds by enhancing updrafts and condensation at high altitudes. In contrast, the ACIs of BB aerosol particles tend to enhance the formation and lifetime of low-level liquid clouds by providing more cloud condensation nuclei (CCN) and to suppress the formation of high-level ice clouds by reducing updrafts and condensable water vapor at high altitudes (> 8 km). For scenarios representing the lower and upper limits of BB emission estimates for recent years (2002-2016), we obtained total regional BB aerosol radiative forcings of −0.2 and 1.5 W m−2, respectively, showing that the influence of BB aerosols on the regional energy balance can range from modest cooling to strong warming. We find that ACIs dominate at low BB emission rates and low aerosol optical depth (AOD), leading to an increased cloud liquid water path (LWP) and negative radiative forcing, whereas ARIs dominate at high BB emission rates and high AOD, leading to a reduction of LWP and positive radiative forcing. In all scenarios, BB aerosols led to a decrease in the frequency of occurrence and rate of precipitation, caused primarily by ACI effects at low aerosol loading and by ARI effects at high aerosol loading. The dependence of precipitation reduction on BB aerosol loading is greater in a strong convective regime than under weakly convective conditions. Overall, our results show that ACIs tend to saturate at high aerosol loading, whereas the strength of ARIs continues to increase and plays a more important role in highly polluted episodes and regions. This should hold not only for BB aerosols over the Amazon, but also for other light-absorbing aerosols such as fossil fuel combustion aerosols in industrialized and densely populated areas. The importance of ARIs at high aerosol loading highlights the need for accurately characterizing aerosol optical properties in the investigation of aerosol effects on clouds, precipitation, and climate. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; atmospheric convection; biomass burning; cloud microphysics; optical depth; precipitation assessment; radiative forcing; weather forecasting; Amazon River
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152837
作者单位	Max Planck Institute for Chemistry, Mainz, Germany; Institute of Physics, University of São Paulo, São Paulo, 05508-900, Brazil; Pacific Northwest National Laboratory, Richland, WA, United States; Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA 92093, United States
推荐引用方式 GB/T 7714	Liu L.,Cheng Y.,Wang S.,et al. Impact of biomass burning aerosols on radiation, clouds, and precipitation over the Amazon: Relative importance of aerosol-cloud and aerosol-radiation interactions[J],2020,20(21).
APA	Liu L..,Cheng Y..,Wang S..,Wei C..,Pöhlker M.L..,...&Su H..(2020).Impact of biomass burning aerosols on radiation, clouds, and precipitation over the Amazon: Relative importance of aerosol-cloud and aerosol-radiation interactions.Atmospheric Chemistry and Physics,20(21).
MLA	Liu L.,et al."Impact of biomass burning aerosols on radiation, clouds, and precipitation over the Amazon: Relative importance of aerosol-cloud and aerosol-radiation interactions".Atmospheric Chemistry and Physics 20.21(2020).