Articles | Volume 13, issue 9
Atmos. Meas. Tech., 13, 4995–5012, 2020
https://doi.org/10.5194/amt-13-4995-2020
Atmos. Meas. Tech., 13, 4995–5012, 2020
https://doi.org/10.5194/amt-13-4995-2020

Research article 25 Sep 2020

Research article | 25 Sep 2020

Calibration of global MODIS cloud amount using CALIOP cloud profiles

Andrzej Z. Kotarba

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Short summary
This paper evaluates the operational approach for producing global (Level 3) cloud amount based on MODIS cloud masks (Level 2). Using CALIPSO we calculate the actual cloud fractions for each cloud mask category, which are 21.5 %, 27.7 %, 66.6 %, and 94.7 % instead of assumed 0 %, 0 %, 100 %, and 100 %. Consequently we find the operational procedure unreliable, especially on a regional/local scale. A method of how to correct and calibrate MODIS global data using CALIPSO detections is suggested.