Open AccessMeasurements of ship‐induced tracks in clouds off the Washington coast
Author(s) -
Ferek Ronald J.,
Hegg Dean A.,
Hobbs Peter V.,
Durkee Philip,
Nielsen Kurt
Publication year - 1998
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/98jd02121
Subject(s) - drizzle , cloud condensation nuclei , environmental science , aerosol , meteorology , advanced very high resolution radiometer , satellite , particle (ecology) , atmospheric sciences , cloud computing , effective radius , liquid water content , cloud base , remote sensing , geology , physics , precipitation , oceanography , astronomy , galaxy , computer science , operating system
In situ cloud microphysical measurements are presented for two ship tracks detected off the Washington coast in three successive satellite images from the advanced very high resolution radiometer (AVHRR) channel 3 (3.7 μm). Aerosol and cloud water chemical data suggest that the tracks were produced by effluents from ship stacks. Cloud droplet spectra measured in the ship tracks had effective radii about one half of those measured in the ambient clouds. A drizzle mode was present in the ambient cloud, but this was largely suppressed in the ship tracks. Analysis of cloud condensation nucleus (CCN) and total particle spectra in and around the ship tracks suggest that the stability of the tracks could have been due to a feedback between the lowering of CCN concentrations as the ship plumes diluted, consequent increases in peak supersaturations in the cloud, and a modest amount of particle growth by gas‐to‐particle conversion.