Cumulus Humilis Aerosol Processing Study (CHAPS)
Summer 2007 ASP Field Campaign
Date of this Version: May 26, 2006
Carl Berkowitz, Larry Berg
( carl.berkowitz@pnl.gov ; larry.berg@pnl.gov )
Atmospheric Chemistry and Meteorology Group
Pacific Northwest National Laboratory
John Ogren
( john.a.ogren@noaa.gov )
Earth System Research Laboratory
National Oceanic and Atmospheric Administration
Chris A. Hostetler and Rich Ferrare
( chris.a.hostetler@nasa.gov , richard.a.ferrare@nasa.gov )
Science Directorate
NASA Langley Research Center
The primary goal of this campaign is to characterize and contrast freshly emitted aerosols above, within and below fields of cumulus humilis (or fair-weather cumulus, FWC) and to use these observations to address how below-cloud and above-cloud aerosol optical and cloud nucleating properties differ downwind of a mid-size city relative to similar aerosols in air less affected by emissions. The observations from this campaign will also be used to aid in the development and evaluation of parameterizations of the transformation and transport of these aerosols by FWC for use in regional-scale and Global Climate Models. This final product has the potential to reduce the uncertainties associated with the treatment of aerosols by these models.
Supporting the in situ observations to be made by the DOE Gulfstream-1 (G-1) aircraft will be profiles of aerosol backscatter and extinction in the vicinity of these clouds to be made with a High Spectral Resolution Lidar (HSRL) onboard the NASA Langley Research CenterŐs King Air Be-200.
Measurements will also be made of the composition of aerosols inside and outside of the urban plume in order to characterize both activated and interstitial aerosols. Due to the transient nature and the small spatial scale of the individual FWC, this study will look at the aerosol properties in aggregate, rather then data from individual transects through a cloud. Surface measurements will be used to continuously characterize aerosol and chemical features within the boundary layer.
Preliminary discussions with the science team of the Cloud and Land Surface Interaction Campaign (CLASIC) project of the DOE ARM Program have identified overlap between the science questions posed for the CLASIC Intensive Operation Period (IOP) and the proposed ASP campaign suggesting collaboration would benefit both teams.
A revised description (2006-05-18) of the campaign is now available. The earlier white paper (2006-03-01) proposing the study is available for reference.
ASP investigators and others interested in this campaign are invited to contact the above investigators.
Additional information on CHAPS, including a calendar of activities, aircraft floor plans, etc. can be found at the CHAPS Home Page.
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