Airborne sunphotometer, airborne in-situ, space-borne, and ground-based measurements of tropospheric aerosol in ACE-2

The North Atlantic Regional Aaosol Characterization Experiment (ACE-2) of the International Global Atmospheric Chemistry Project (IGAC) ran from 16 June to 25 July 1997. The results presented in this study are part of the “Clear-sky column closure experiment” (CLEARCOLUMN) activity, one of 6 ACE-2 activities. Clear-sky column closure experiments call for characterization of aerosol layers by simultaneous measurements using different techniques that can be related using models. A wide range of aerosol types was encountered throughout the ACE-2 area, including background Atlantic marine, European pollution-derived and African mineral dust. In a series of papers, we reported on ACE-2 CLEARCOLUMN results obtained by combining airborne sunphotometer and in-situ measurements taken aboard the Pelican aircraft, spaceborne NOAA/AVHRR data and ground-based lidar and sunphotometer measurements. Those and other CLEARCOLUMN results have been summarized previously. In this paper we only report on results not shown in this form