Investigation of clear-sky occurrence rate estimated from CALIOP and MODIS observations

Nawo Eguchi, Tatsuya Yokota

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We derived the global 6distribution 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.

Original languageEnglish
Article numberL23816
JournalGeophysical Research Letters
Issue number23
Publication statusPublished - Dec 16 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


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