Accession Number : ADA332598

Title :   Cloud Condensation Nuclei Measurements in Shiptrails

Descriptive Note : Final rept. 1 Feb 94-31 Jan 97

Corporate Author : MACKAY SCHOOL OF MINES RENO NV

Personal Author(s) : Hudson, James G.

PDF Url : ADA332598

Report Date : NOV 1997

Pagination or Media Count : 2

Abstract : Enhancements of droplet concentrations in clouds affected by four ships were fairly accurately predicted from ship emission factors and plume and background cloud condensation nucleus (CCN) spectra. Ship exhausts thus accounted for the increased droplet concentrations in these ship tracks. Derived supersaturations were typical of marine stratus clouds, although there was evidence of some lowering of supersaturations in some ship tracks closer to the ships where CCN and droplet concentrations were very high. Systematic differences were measured in the emission rates of CCN for different engines and fuels. Diesel engines burning low grade marine fuel oil produced order of magnitude higher CCN emissions than turbine engines burning higher grade fuel. Consequently, diesel ships burning low grade fuel were responsible for nearly all of the observed ship track clouds. There is some evidence that fuel type is a better predictor of ship track potential than engine type.

Descriptors :   *STRATUS CLOUDS, *CONDENSATION NUCLEI, DIESEL ENGINES, GAS TURBINES, SUPERSATURATION, EXHAUST PLUMES, DIESEL FUELS, RESEARCH AIRCRAFT, FUEL OIL, JET ENGINE EXHAUST.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE