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Title: CCN Spectral Shape and Stratus Cloud and Drizzle Microphysics

Abstract

The shapes of high-resolution cloud condensation nucleus (CCN) spectra are compared with cloud and precipitation characteristics observed in the Marine Stratus/Stratocumulus Experiment. These high-resolution spectra often revealed bimodality that is usually caused by in-cloud processing. Bimodal CCN spectra were associated with clouds that had as much as double the concentrations of droplets with narrower distributions and as much as an order of magnitude less drizzle than clouds associated with the most extreme unimodal CCN spectra. We present objective CCN spectral metrics: (1) CCN concentration differences between the two modes, unprocessed (Aitken, N u) and processed (accumulation, N p), and (2) slopes of cumulative CCN spectra. Both of these CCN spectral shape classifications show similar cloud droplet concentration (N c) trends to that of an earlier subjective modal rating system. When there are two modes, they are separated either by minimal concentrations or concentration inflections. Enhancement of N c is traced to greater CCN bimodality that causes narrower droplet spectra that suppress drizzle. These effects could augment indirect aerosol effects and can only be shown by high-resolution CCN spectral shape comparisons with cloud and drizzle microphysics.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Desert Research Inst., Reno, NV (United States)
  2. Savannah River National Lab., Aiken, SC (United States)
  3. Fleet Numerical Meteorology and Oceanography Center (FNMOC), Monterey, CA (United States)
Publication Date:
Research Org.:
Univ. of Nevada, Reno, NV (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); National Science Foundation (NSF)
OSTI Identifier:
1469224
Alternate Identifier(s):
OSTI ID: 1469225; OSTI ID: 1548297
Grant/Contract Number:  
FG02-05ER63999; SC0009162; AGS‐1035230; FG02‐05ER63999
Resource Type:
Published Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 123; Journal Issue: 17; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; CCN; clouds; drizzle

Citation Formats

Hudson, James G., Noble, Stephen, and Tabor, Samantha. CCN Spectral Shape and Stratus Cloud and Drizzle Microphysics. United States: N. p., 2018. Web. doi:10.1029/2017jd027865.
Hudson, James G., Noble, Stephen, & Tabor, Samantha. CCN Spectral Shape and Stratus Cloud and Drizzle Microphysics. United States. doi:10.1029/2017jd027865.
Hudson, James G., Noble, Stephen, and Tabor, Samantha. Sat . "CCN Spectral Shape and Stratus Cloud and Drizzle Microphysics". United States. doi:10.1029/2017jd027865.
@article{osti_1469224,
title = {CCN Spectral Shape and Stratus Cloud and Drizzle Microphysics},
author = {Hudson, James G. and Noble, Stephen and Tabor, Samantha},
abstractNote = {The shapes of high-resolution cloud condensation nucleus (CCN) spectra are compared with cloud and precipitation characteristics observed in the Marine Stratus/Stratocumulus Experiment. These high-resolution spectra often revealed bimodality that is usually caused by in-cloud processing. Bimodal CCN spectra were associated with clouds that had as much as double the concentrations of droplets with narrower distributions and as much as an order of magnitude less drizzle than clouds associated with the most extreme unimodal CCN spectra. We present objective CCN spectral metrics: (1) CCN concentration differences between the two modes, unprocessed (Aitken, Nu) and processed (accumulation, Np), and (2) slopes of cumulative CCN spectra. Both of these CCN spectral shape classifications show similar cloud droplet concentration (Nc) trends to that of an earlier subjective modal rating system. When there are two modes, they are separated either by minimal concentrations or concentration inflections. Enhancement of Nc is traced to greater CCN bimodality that causes narrower droplet spectra that suppress drizzle. These effects could augment indirect aerosol effects and can only be shown by high-resolution CCN spectral shape comparisons with cloud and drizzle microphysics.},
doi = {10.1029/2017jd027865},
journal = {Journal of Geophysical Research: Atmospheres},
number = 17,
volume = 123,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1029/2017jd027865

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