Validation of aerosol and cloud layer structures from the space-borne lidar CALIOP using a ground-based lidar in Seoul, Korea

By Sang Woo Kim, S. Berthier, Jean-Christophe Raut, P. Chazette, F. Dulac, Soon-chang Yoon. 2008

145 citations recorded by the source corpus.

We present initial validation results of the space-borne lidar CALIOP onboard CALIPSO satellite us- ing coincidental observations from a ground-based lidar in Seoul National University (SNU), Seoul, Korea (37.46 N, 126.95 E). We analyze six selected cases between Septem- ber 2006 and February 2007, including 3 daytime and 3 night-time observations and covering different types of clear and cloudy atmospheric conditions. Apparent scattering ratios calculated from the two lidar measurements of to- tal attenuated backscatter at 532 nm show similar aerosol and cloud layer structures both under cloud-free conditions and in cases of multiple aerosol layers underlying semi- transparent cirrus clouds. Agreement on top and base heights of cloud and aerosol layers is generally within 0.10 km, particularly during night-time. This result confirms that the CALIPSO science team algorithms for the discrimina- tion of cloud and aerosol as well as for the detection of layer top and base altitude provide reliable information in such atmospheric conditions. This accuracy of the plane- tary boundary layer top height under cirrus cloud appears, however, limited during daytime. Under thick cloud con- ditions, however, information on the cloud top (bottom) height only is reliable from CALIOP (ground-based lidar) due to strong signal attenuations. However, simultaneous space-borne CALIOP and ground-based SNU lidar (SNU- L) measurements complement each other and can be com- bined to provide full information on the vertical distribution of aerosols and clouds. An aerosol backscatter-to-extinction ratio (BER) estimated from lidar and sunphotometer synergy at the SNU site during the CALIOP overpass is assessed to be 0.023±0.004 sr 1 (i.e. a lidar ratio of 43.2±6.2 sr) from

Subfields: Atmospheric Science, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/009129dac8f7ee8b812ddfc1f145574426b4b701

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In Atmospheric Science

Anthony J. Baran

In Global and Planetary Change

Citations in the corpus

A review of the light scattering properties of cirrus (2009, methodology): “The active instruments on the A-train consist of a 94GHz cloud-profiling radar called CloudSat [17], which estimates the total amount of ice mass (ice water content) contained in the Earth’s atmosphere and a lidar that measures the extinction and the linear depolarization ratio of aerosol and cirrus”
Comparison of CALIOP level 2 aerosol subtypes to aerosol types derived from AERONET inversion data (2009, methodology): “CALIOP has been validated, for example, by Kim et al. [2008] and Liu et al. [2009].”