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Aerosols consistently suppress the convective boundary layer development

Journal Article · · Atmospheric Research
 [1];  [2];  [2];  [2];  [3];  [4];  [5]
  1. Nanjing Univ. of Information Science and Technology (China); Univ. of Oklahoma, Norman, OK (United States)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Fujian Academy of Environmental Sciences, Fuzhou (China); Nanjing Univ. of Information Science and Technology (China)
  5. Nanjing Univ. of Information Science and Technology (China)
Aerosols with different vertical distribution and various optical properties induce diverse heating rates and thereby affecting convective boundary layer (CBL) development. Our results showed consistent CBL-suppression of aerosols during daytime with numerical experiments, in which aerosols were specified at different heights with synthesized single scattering albedo from 64 studies and asymmetry factor from 20 studies globally. Absorbing aerosols concentrated below but close to the CBL top had the strongest suppression effect on CBL development relative to that concentrated near surface or above CBL. Aerosol cooling effect by attenuating incident solar radiation and surface heat flux exceeded its warming effect by reheating the atmosphere layer with absorbed shortwave radiation, and eventually declined net heating rate, which inhibited CBL development, lowered mixed-layer potential temperature and stabilized atmospheric stratification. Stove effect of absorbing aerosols (CBL enhancement) under a zero background aerosol extinction coefficient is negligible for dominant dome effect (CBL suppression) which consistently suppresses CBL development regardless of aerosol vertical height and background aerosol extinction coefficient. Our study also highlighted the importance of specifying background aerosol extinction coefficient in numerical experiments for accurate assessment of aerosol radiative forcing and CBL-aerosol interactions.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center; Univ. of Oklahoma, Norman, OK (United States)
Sponsoring Organization:
China Scholarship Council (CSC); National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Contributing Organization:
Argonne National Laboratory (ANL); Brookhaven National Laboratory (BNL); Oak Ridge National Laboratory (ORNL); Pacific Northwest National Laboratory (PNNL)
Grant/Contract Number:
SC0021159
OSTI ID:
1844965
Alternate ID(s):
OSTI ID: 1868448
Journal Information:
Atmospheric Research, Journal Name: Atmospheric Research Vol. 269; ISSN 0169-8095
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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