Assessment of CALIOP-Derived CCN Concentrations by In Situ Surface Measurements

The satellite-based cloud condensation nuclei (CCN) proxies used to quantify the aerosol-cloud interactions (ACIs) are column integrated and do not guarantee vertical co-location of aerosols clouds. This has encouraged use height-resolved measurements spaceborne lidars for ACI studies led advancements in lidar-based CCN retrieval algorithms. In this study, we present a comparison between number concentration (nCCN) derived from ground-based situ lidar cloud-aerosol with orthogonal polarization (CALIOP) measurements. On analysing their monthly time series, found that about 88% CALIOP nCCN estimates remained within factor 1.5 Overall, were good agreement normalized mean error 71%, bias 39% correlation coefficient 0.68. Based on our results, point out necessary measures should be considered global retrieval. Our results show competence compiling height- type-resolved dataset studies.