Science Overview Document Indirect and Semi-Direct Aerosol Campaign (ISDAC) April 2008 [report]

SJ Ghan, B Schmid, JM Hubbe, CJ Flynn, A Laskin, AA Zelenyuk, DJ Czizco, CN Long, G McFarquhar, J Verlinde, J Harrington, JW Strapp (+20 others)
2007 unpublished
We propose to deploy an intensive cloud and aerosol observing system to the ARM Climate Research Facility's (ACRF) North Slope of Alaska (NSA) locale for three weeks in April 2008. This period has been chosen because it is during the International Polar Year when many ancillary observing systems will be collecting data that will be synergistic for interpreting the Indirect and Semi-Direct Aerosol Campaign (ISDAC) data. It also provides an important contrast with the October 2004 Mixed-Phase
more » ... 004 Mixed-Phase Arctic Cloud Experiment (M-PACE). We will require 30 to 45 hours of flight time for an aircraft capable of measuring temperature, humidity, total particle number, aerosol size distribution, aerosol hygroscopicity, cloud condensation nuclei concentration, ice nuclei concentration, optical scattering and absorption, updraft velocity, cloud liquid water and ice contents, cloud droplet and crystal size distributions, cloud particle shape, and cloud extinction. In addition to these aircraft measurements, we propose surface deployment of a spectroradiometer for retrieving cloud optical depth and effective radius. These measurements will be used by members of the ARM Science Team to answer the following key questions:
doi:10.2172/947999 fatcat:a4zmckv5ofhnfciboyw56t2tse