Version 4 CALIPSO Imaging Infrared Radiometer ice and liquid water cloud microphysical properties – Part II: Results over oceans

Abstract. Following the release of version 4 Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) data products from and Infrared Pathfinder Satellite Observations (CALIPSO) mission, a new (V4) CALIPSO Imaging Radiometer (IIR) Level 2 has been developed. The IIR include cloud effective emissivities microphysical properties such as diameter (De) water path estimates for ice liquid clouds. This paper (Part II) shows retrievals over ocean describes improvements made respect to 3 (V3) result significant changes implemented in V4 algorithms, which are presented companion I). analysis three-channel observations (08.65, 10.6, 12.05 µm) is informed by scene classification provided CALIOP 5 km layer aerosol products. Thanks reduction inter-channel emissivity biases semi-transparent (ST) clouds when oceanic background radiance derived model computations, number unbiased increased factor V4. In V3, these caused inconsistencies between diameters retrieved 12/10 (?eff12/10 = ?a,12/?a,10) 12/08 (?eff12/08 ?a,12/?a,08) pairs channels at smaller than 0.5. V4, ST possible more 80 % pixels down 0.05 (or visible optical depth ?0.1). For month January 2008, was chosen illustrate results, median De (IWP) are, respectively, 38 µm g m?2 clouds, random uncertainty 50 %. relationship indices better agreement “severely roughened single column” habit eight-element aggregate” coldest (<210 K) 60 warmest (>230 K). Retrievals opaque improved especially night pair channels, due corrections V3 radiative temperature geometric altitudes. Median IWP 58 97 again Comparisons Moderate Resolution Spectroradiometer (MODIS)/Aqua tropics show MODIS visible–3.7 visible–2.1 opposite prevailingly supercooled centroid altitudes above km, 13 3.4 estimated uncertainties 45 35 %, respectively. values 18 31 night, 8 µm,