Accession Number : ADA322091

Title :   Aerosol Properties and Dynamics in the Marine Boundary Layer, 'Real Time Measurement of Oceanic Ammonia Flux'.

Descriptive Note : Final rept. 1 Oct 93-31 Dec 96,

Corporate Author : HAWAII UNIV HONOLULU DEPT OF OCEANOGRAPHY

Personal Author(s) : Clarke, Anthony D.

PDF Url : ADA322091

Report Date : 24 FEB 1997

Pagination or Media Count : 7

Abstract : This grant incorporated two proposals that have three major efforts. These included support for our participation in and analysis of ASTEX aircraft data, a related measurement program at a coastal site in Hawaii and a separate proposal funded to develop an ammonia flux detector for the real time study of ocean atmosphere fluxes. In pursuing these objectives, we demonstrated that modeling of aerosol microphysics was successful at establishing radiative closure with in situ aircraft measurements within about 20%. We also showed that fine particle sulfate dominates short wavelength extinction for pollutant aerosol over the Atlantic and demonstrated that soot aerosol in European pollution was internally mixed with sulfate and contributed about 15% to the total column extinction In related work we demonstrated that a Lagrangian aerosol experiment was feasible and that the dominant influence on aerosol evolution in a non-precipitating system was dilution through entrainment from the free troposphere. This included a decoupled boundary layer model that established constraints on entrainment through the inversion and mixing. Our most recent activities demonstrated that a continuous ammonia flux detector is feasible and can be deployed from ship under typical open ocean conditions.

Descriptors :   *AEROSOLS, *MARINE ATMOSPHERES, *POLLUTANTS, EXTINCTION, MEASUREMENT, PARTICLE SIZE, FLUX(RATE), BOUNDARY LAYER, AMMONIA, MASS TRANSFER, LAGRANGIAN FUNCTIONS.

Subject Categories : Air Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE