 |
|
|
|
|
Peter H. Daum Brookhaven National Laboratory Atmospheric Sciences Division Bldg. 815E, 75 Rutherford Drive Upton, NY 11973-5000 Tel: 631-344-7283 Fax: 631-344-2887 email: phdaum@bnl.gov The primary focus of this proposal is to provide an enhanced scientific basis for specifying the relationship between aerosol chemical and physical properties and their properties as cloud condensation nuclei (CCN); CCN and cloud droplet microphysics; and, between cloud droplet microphysics and the initiation of drizzle in warm clouds. Aerosol activation, droplet formation, and drizzle production will be studied using the Department of Energy (DOE) G-1 aircraft as the primary measurement platform. The intention is to make measurements in diverse environments containing the major categories of aerosols that need to be represented in General Circulation Models (GCMs). Because of the necessity to separately identify anthropogenic impacts, the studies will start with urban, industrial, and power plant aerosol sources. The selection of proposed field venues also includes marine and biogenic organic environments. To make optimum use of the G-1 aircraft, it is proposed that aerosol/CCN studies be done during clear-air flights designed to investigate aerosol direct radiative effects. Separate field studies are proposed for the in-cloud work. In recognition of the fact that computational constraints dictate a compact description of aerosol composition and cloud microphysics, the focus is on determining the essential features of aerosols that need to be incorporated into GCMs to predict aerosol indirect effects. Keywords: aerosols, cloud condensation nuclei, cloud microphysics, radiation fields, indirect effects. [back to ASP ST Membership] |