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Using TOMS total-ozone measurements over high-altitude cloud locations and nearby pairedclear locations, we describe the Clear-Cloudy Pairs (CCP) method for deriving tropicaltropospheric ozone. The high-altitude clouds are identified by measured380 nm reflectivities greater than 80% and Temperature Humidity InfraRed (THIR) measured cloud-top pressuresless than 200 hPa. To account for locations without high-altitude clouds, we apply a zonal sinefitting to the stratospheric ozone derived from available cloudy points, resulting in a wave-oneamplitude of about 4 DU. THIR data is unavailable after November 1984, so we extend theCCP method by using a reflectivity threshold of 90% to identify high-altitude clouds andremove the influence of high-reflectivity-but-low-altitude clouds with a lowpass frequencyfilter. We correct ozone retrieval errors associated with clouds, and ozone retrieval errors dueto sun glint and aerosols.  Comparing CCP results with Southern Hemisphere ADditionalOZonesondes (SHADOZ) tropospheric ozone indicates that CCP tropospheric ozone andozonesonde measurements agree, on average, to within 3 ± 1 DU standard error of the mean.The most significant difference between CCP and ozonesonde tropospheric ozone can beexplained by the low Total Ozone Mapping Spectrometer (TOMS) version-7 retrievalefficiency of ozone in the lower troposphere

Tropical tropospheric ozone derived using Clear-Cloudy Pairs (CCP) of TOMS measurements