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Title: A comparison of cloud properties at a coastal and inland site at the North Slope of Alaska

In this study, we have examined differences in cloud liquid water paths (LWPs) at a coastal (Barrow) and an inland (Atqasuk) location on the North Slope of Alaska using microwave radiometer (MWR) data collected by the U.S. Department of Energy's Atmospheric Radiation Measurement program for the period June-September 1999. Revised retrieval procedures and a filtering algorithm to eliminate data contaminated by wet windows on the MWRs were employed to extract high-quality data suitable for this study. For clouds with low base heights (<350 m), the LWPs at the coastal site were significantly higher than those at the inland site, but for clouds with higher base heights the differences were small. Air-surface interactions may account for some of the differences. Comparisons were also made between observed LWPs and those simulated with the European Centre for Medium-Range Weather Forecasts (ECMWF) model. The model usually successfully captured the occurrence of cloudy periods but it underpredicted the LWPs by approximately a factor of two. It was also unsuccessful in reproducing the observed differences in LWPs between Barrow and Atqasuk. Some suggestions on possible improvements in the model are presented.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. European Centre for Medium-Range Weather Forecasts, Reading (England)
Publication Date:
OSTI Identifier:
15001941
Report Number(s):
PNNL-SA--35459
Journal ID: ISSN 0148-0227; KP1201030
Grant/Contract Number:
AC06-76RL01830; W-31109-Eng-38
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research
Additional Journal Information:
Journal Volume: 107; Journal Issue: D11; Journal ID: ISSN 0148-0227
Publisher:
American Geophysical Union
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
arctic clouds; cloud liquid water; microwave radiometer; ECMWF model; air-surface interactions