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Title: Cloud Optical Properties Over West Antarctica From Shortwave Spectroradiometer Measurements During AWARE

Abstract

A shortwave spectroradiometer was deployed on the West Antarctic Ice Sheet (WAIS) as part of the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) program ARM West Antarctic Radiation Experiment (AWARE). This instrument recorded 1-min averages of downwelling hemispheric spectral irradiance covering the wavelength range 350–2,200 nm with spectral resolution 3 and 10 nm for wavelengths shorter and longer than 1,000 nm, respectively. Using simultaneous micropulse lidar data to identify the thermodynamic phase of stratiform clouds, a radiative transfer algorithm is used here to retrieve optical depth and effective droplet (or particle) size for single-phase liquid water and ice water clouds. The AWARE campaign on the WAIS first sampled typical climatological conditions between 7 December 2015 and 9 January 2016 and then a much warmer air mass with more moisture associated with a surface melt event between 10 and 17 January 2016. Before the melt event most liquid cloud effective droplet radii were consistent with pristine polar maritime clouds (mode radius 13.5 μm) but showed a second local maximum in the distribution (at 8 μm) consistent with colder, moisture-limited conditions. Most ice clouds sampled occurred before the melt event (mode optical depth 4 and effective particle size 19 μm). Duringmore » the melt event liquid water cloud optical depth nearly doubled (mode value increasing from 8 to 14). AWARE therefore sampled on the WAIS two cases relevant to climate model simulations: typical current climatological conditions, followed by warmer meteorology possibly consistent with future increasing surface melt scenarios.« less

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [2]
  1. Utah Dept. of Environmental Quality, Salt Lake City, UT (United States)
  2. Univ. of California, San Diego, CA (United States). Scripps Inst. of Oceanography
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Science Foundation (NSF); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1484684
Alternate Identifier(s):
OSTI ID: 1468369
Grant/Contract Number:  
AC02-06CH11357; SC0017981; PLR-1443549; OCE-1359222; ANT-1543305; NNX15AN45H
Resource Type:
Accepted Manuscript
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:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Wilson, A., Scott, R. C., Cadeddu, M. P., Ghate, V., and Lubin, D. Cloud Optical Properties Over West Antarctica From Shortwave Spectroradiometer Measurements During AWARE. United States: N. p., 2018. Web. doi:10.1029/2018JD028347.
Wilson, A., Scott, R. C., Cadeddu, M. P., Ghate, V., & Lubin, D. Cloud Optical Properties Over West Antarctica From Shortwave Spectroradiometer Measurements During AWARE. United States. doi:10.1029/2018JD028347.
Wilson, A., Scott, R. C., Cadeddu, M. P., Ghate, V., and Lubin, D. Mon . "Cloud Optical Properties Over West Antarctica From Shortwave Spectroradiometer Measurements During AWARE". United States. doi:10.1029/2018JD028347. https://www.osti.gov/servlets/purl/1484684.
@article{osti_1484684,
title = {Cloud Optical Properties Over West Antarctica From Shortwave Spectroradiometer Measurements During AWARE},
author = {Wilson, A. and Scott, R. C. and Cadeddu, M. P. and Ghate, V. and Lubin, D.},
abstractNote = {A shortwave spectroradiometer was deployed on the West Antarctic Ice Sheet (WAIS) as part of the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) program ARM West Antarctic Radiation Experiment (AWARE). This instrument recorded 1-min averages of downwelling hemispheric spectral irradiance covering the wavelength range 350–2,200 nm with spectral resolution 3 and 10 nm for wavelengths shorter and longer than 1,000 nm, respectively. Using simultaneous micropulse lidar data to identify the thermodynamic phase of stratiform clouds, a radiative transfer algorithm is used here to retrieve optical depth and effective droplet (or particle) size for single-phase liquid water and ice water clouds. The AWARE campaign on the WAIS first sampled typical climatological conditions between 7 December 2015 and 9 January 2016 and then a much warmer air mass with more moisture associated with a surface melt event between 10 and 17 January 2016. Before the melt event most liquid cloud effective droplet radii were consistent with pristine polar maritime clouds (mode radius 13.5 μm) but showed a second local maximum in the distribution (at 8 μm) consistent with colder, moisture-limited conditions. Most ice clouds sampled occurred before the melt event (mode optical depth 4 and effective particle size 19 μm). During the melt event liquid water cloud optical depth nearly doubled (mode value increasing from 8 to 14). AWARE therefore sampled on the WAIS two cases relevant to climate model simulations: typical current climatological conditions, followed by warmer meteorology possibly consistent with future increasing surface melt scenarios.},
doi = {10.1029/2018JD028347},
journal = {Journal of Geophysical Research: Atmospheres},
number = 17,
volume = 123,
place = {United States},
year = {2018},
month = {7}
}

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