Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523816e&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 23, CiteID L23816
Physics
7
Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408), Global Change: Remote Sensing (1855)
Scientific paper
We derived the global distribution of the clear-sky occurrence rate during the daytime using Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and Moderate-resolution Imaging Spectrometer (MODIS) data. Our goal was to estimate the frequency of likely successful CO2 and CH4 column concentration retrievals by the Greenhouse gases Observing Satellite (GOSAT). Clear-sky regions over land were frequently found around desert regions throughout the year, and at northern mid-latitudes in the winter hemisphere. Overall, clear-sky regions covered approximately 11% of the globe annually, on average. From a comparison of the CALIOP and MODIS cloud data for June 2007, we found that MODIS overestimated the clear-sky ratio by approximately 5%, except for in the tropics.
Eguchi Nawo
Yokota Tatsuya
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