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Title: Effects of Continental Clouds on Surface Aitken and Accumulation Modes

Abstract

Relationships among clouds and surface aerosol are investigated at the Oklahoma Atmospheric Radiation Measurements Southern Great Plains site. Cloud chemical transformations, coalescence, and Brownian capture increase material within cloud droplets. Then when cloud droplets evaporate, as they often do, their residuals are larger than unnucleated particles. This creates a bimodal particle size distribution by moving some Aitken mode (25- to 100-nm diameter) particles to the accumulation mode (100- to 825-nm diameter). Clouds also block solar radiation that causes photochemical reactions that produce small particles that grow by coagulation and condensation into the Aitken mode. Highly significant positive correlations of remotely sensed cloud fraction (cf) with time-lagged Aitken and accumulation mode mean particle diameter (mpd) isolated the effects of cloud processing on both modes. Positive correlations of cf with accumulation concentrations and negative correlations of cf with Aitken concentrations also provided evidence of cloud processing. Photochemical production of very small particles under clear daylight skies worked together with cloud processing to enhance Aitken mpd and concentration correlations with cf. Cloud-processed aerosol was evident only during daylight and when the boundary layer mixing height exceeded the remotely sensed cloud base altitude. Greater cf, especially consecutive high cf hours increased accumulation and Aitkenmore » mpd and accumulation concentrations while it decreased Aitken concentrations. Lower cf, especially consecutive hours of no clouds, decreased overall mpd and did not enhance the accumulation mode. All of these conclusions implicated clouds as a source of the accumulation mode, and thus, clouds seemed to explain bimodal aerosol over the mid-North American continent.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
  2. Desert Research Inst. (DRI), Reno, NV (United States)
Publication Date:
Research Org.:
Univ. of Nevada, Reno, NV (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1515118
Alternate Identifier(s):
OSTI ID: 1515119; OSTI ID: 1547367
Grant/Contract Number:  
SC0009162; FG02‐05ED63999
Resource Type:
Published Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 124; Journal Issue: 10; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; aerosol spectra; Aitken particles; accumulation particles; CCN; clouds; remote sensing

Citation Formats

Noble, Stephen R., and Hudson, James G. Effects of Continental Clouds on Surface Aitken and Accumulation Modes. United States: N. p., 2019. Web. doi:10.1029/2019jd030297.
Noble, Stephen R., & Hudson, James G. Effects of Continental Clouds on Surface Aitken and Accumulation Modes. United States. doi:10.1029/2019jd030297.
Noble, Stephen R., and Hudson, James G. Mon . "Effects of Continental Clouds on Surface Aitken and Accumulation Modes". United States. doi:10.1029/2019jd030297.
@article{osti_1515118,
title = {Effects of Continental Clouds on Surface Aitken and Accumulation Modes},
author = {Noble, Stephen R. and Hudson, James G.},
abstractNote = {Relationships among clouds and surface aerosol are investigated at the Oklahoma Atmospheric Radiation Measurements Southern Great Plains site. Cloud chemical transformations, coalescence, and Brownian capture increase material within cloud droplets. Then when cloud droplets evaporate, as they often do, their residuals are larger than unnucleated particles. This creates a bimodal particle size distribution by moving some Aitken mode (25- to 100-nm diameter) particles to the accumulation mode (100- to 825-nm diameter). Clouds also block solar radiation that causes photochemical reactions that produce small particles that grow by coagulation and condensation into the Aitken mode. Highly significant positive correlations of remotely sensed cloud fraction (cf) with time-lagged Aitken and accumulation mode mean particle diameter (mpd) isolated the effects of cloud processing on both modes. Positive correlations of cf with accumulation concentrations and negative correlations of cf with Aitken concentrations also provided evidence of cloud processing. Photochemical production of very small particles under clear daylight skies worked together with cloud processing to enhance Aitken mpd and concentration correlations with cf. Cloud-processed aerosol was evident only during daylight and when the boundary layer mixing height exceeded the remotely sensed cloud base altitude. Greater cf, especially consecutive high cf hours increased accumulation and Aitken mpd and accumulation concentrations while it decreased Aitken concentrations. Lower cf, especially consecutive hours of no clouds, decreased overall mpd and did not enhance the accumulation mode. All of these conclusions implicated clouds as a source of the accumulation mode, and thus, clouds seemed to explain bimodal aerosol over the mid-North American continent.},
doi = {10.1029/2019jd030297},
journal = {Journal of Geophysical Research: Atmospheres},
number = 10,
volume = 124,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1029/2019jd030297

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