Use of CALIPSO lidar observations to evaluate the cloudiness simulated by a climate model

Details Use of CALIPSO lidar observations to evaluate the cloudiness simulated by a climate model Use of CALIPSO lidar observations to evaluate the cloudiness simulated by a climate model

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515704c&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 15, CiteID L15704

Physics

18

Global Change: Atmosphere (0315, 0325), Global Change: Global Climate Models (3337, 4928), Atmospheric Composition And Structure: Cloud/Radiation Interaction, Global Change: Remote Sensing (1855), Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408)

Scientific paper

New space-borne active sensors make it possible to observe the three-dimensional structure of clouds. Here we use CALIPSO lidar observations together with a lidar simulator to evaluate the cloudiness simulated by a climate model: modeled atmospheric profiles are converted to an ensemble of subgrid-scale attenuated backscatter lidar signals from which a cloud fraction is derived. Except in regions of persistent thick upper-level clouds, the cloud fraction diagnosed through this procedure is close to that actually predicted by the model. A fractional cloudiness is diagnosed consistently from CALIPSO data at a spatio-temporal resolution comparable to that of the model. The comparison of the model's cloudiness with CALIPSO data reveals discrepancies more pronounced than in previous model evaluations based on passive observations. This suggests that space-borne lidar observations constitute a powerful tool for the evaluation of clouds in large-scale models, including marine boundary-layer clouds

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