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Comparison of Monthly Mean Cloud Fraction and Cloud Optical depth Determined from Surface Cloud Radar, TOVS, AVHRR, and MODIS over Barrow, AlaskaA one year comparison is made of mean monthly values of cloud fraction and cloud optical depth over Barrow, Alaska (71 deg 19.378 min North, 156 deg 36.934 min West) between 35 GHz radar-based retrievals, the TOVS Pathfinder Path-P product, the AVHRR APP-X product, and a MODIS based cloud retrieval product from the CERES-Team. The data sets represent largely disparate spatial and temporal scales, however, in this paper, the focus is to provide a preliminary analysis of how the mean monthly values derived from these different data sets compare, and determine how they can best be used separately, and in combination to provide reliable estimates of long-term trends of changing cloud properties. The radar and satellite data sets described here incorporate Arctic specific modifications that account for cloud detection challenges specific to the Arctic environment. The year 2000 was chosen for this initial comparison because the cloud radar data was particularly continuous and reliable that year, and all of the satellite retrievals of interest were also available for the year 2000. Cloud fraction was chosen as a comparison variable as accurate detection of cloud is the primary product that is necessary for any other cloud property retrievals. Cloud optical depth was additionally selected as it is likely the single cloud property that is most closely correlated to cloud influences on surface radiation budgets.
Document ID
20050081826
Document Type
Conference Paper
Authors
Uttal, Taneil (National Oceanic and Atmospheric Administration Boulder, CO, United States)
Frisch, Shelby (Colorado State Univ. Fort Collins, CO, United States)
Wang, Xuan-Ji (National Environmental Satellite Service Madison, WI, United States)
Key, Jeff (National Environmental Satellite Service Madison, WI, United States)
Schweiger, Axel (Washington Univ. Seattle, WA, United States)
Sun-Mack, Sunny (NASA Langley Research Center Hampton, VA, United States)
Minnis, Patrick (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2005
Subject Category
Meteorology and Climatology
Meeting Information
85th AMS Annual Meeting(San Diego, CA)
Funding Number(s)
OTHER: 23-621-35-96
Distribution Limits
Public
Copyright
Other