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

The ARM Climate Research Facility’s (ACRF) Aerial Vehicle Program (AVP) will deploy an intensive cloud and aerosol observing system to the ARM North Slope of Alaska (NSA) locale for a five week Indirect and Semi-Direct Aerosol Campaign (ISDAC) during period 29 March through 30 April 2008. The deploy...

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Bibliographic Details
Main Authors: SJ Ghan, B Schmid, JM Hubbe, CJ Flynn, A Laskin, AA Zelenyuk, DJ Czizco, CN Long, G McFarquhar, J Verlinde, J Harrington, JW Strapp, P Liu, A Korolev, A McDonald, M Wolde, A Fridlind, T Garrett, G Mace, G Kok, S Brooks, D Collins, D Lubin, P Lawson, M Dubey, C Mazzoleni, M Shupe, S Xie, DD Turner, Q Min, EJ Mlawer, D Mitchell;
Language:unknown
Published: 2016
Subjects:
54 ENVIRONMENTAL SCIENCES
MONITORING
AEROSOLS
AIRCRAFT
CLIMATES
CLOUDS
CONDENSATION NUCLEI
HYGROSCOPICITY
PARTICLE SIZE
ALASKA
Arctic
Barrow
International Polar Year
north slope
Alaska
Online Access:http://www.osti.gov/servlets/purl/947999
https://www.osti.gov/biblio/947999
https://doi.org/10.2172/947999
Description
Summary:The ARM Climate Research Facility’s (ACRF) Aerial Vehicle Program (AVP) will deploy an intensive cloud and aerosol observing system to the ARM North Slope of Alaska (NSA) locale for a five week Indirect and Semi-Direct Aerosol Campaign (ISDAC) during period 29 March through 30 April 2008. The deployment period is within the International Polar Year, thus contributing to and benefiting from the many ancillary observing systems collecting data synergistically. We will deploy the Canadian National Research Council Convair 580 aircraft to measure temperature, humidity, total particle number, aerosol size distribution, single particle composition, concentrations of cloud condensation nuclei and ice nuclei, 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, ISDAC will deploy two instruments at the ARM site in Barrow: a spectroradiometer to retrieve cloud optical depth and effective radius, and a tandem differential mobility analyzer to measure the aerosol size distribution and hygroscopicity. By using many of the same instruments used during Mixed-Phase Arctic Cloud Experiment (M-PACE), conducted in October 2004, we will be able to contrast the arctic aerosol and cloud properties during the fall and spring transitions. The aerosol measurements can be used in cloud models driven by objectively analyzed boundary conditions to test whether the cloud models can simulate the aerosol influence on the clouds. The influence of aerosol and boundary conditions on the simulated clouds can be separated by running the cloud models with all four combinations of M-PACE and ISDAC aerosol and boundary conditions: M-PACE aerosol and boundary conditions, M-PACE aerosol and ISDAC boundary conditions, ISDAC aerosol and M-PACE boundary conditions, and ISDAC aerosol and boundary conditions. ISDAC and M-PACE boundary conditions are likely to be very different because of ...

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