Accession Number : ADA298585

Title :   Temporal Effects of Shiptracks on Clouds.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Brown, Andrew, III

PDF Url : ADA298585

Report Date : MAR 1995

Pagination or Media Count : 133

Abstract : The physical and optical characteristics of 27 shiptracks are analyzed using AVHRR satellite data. Channel 1 (.63um), and channel 3 (3.7um), are utilized to determine the temporal variations in shiptrack albedo and track width. In most cases, shiptracks mirror the trend of albedo changes exhibited by the ambient clouds in which they are formed. Under special circumstances, shiptrack albedo increases when ambient cloud albedo decreases due to cloud thinning. Shiptrack widths show uniformity of growth, with rapid growth rates of 4-6 km/hr in the near-source region, decreasing to 1-2 km/hr in the far field. Maximum width ranges from 10 to 12 kilometers. Predicted growth rates based on a parameterization of the standard deviation of plume concentration correlate well with observed track width values.

Descriptors :   *CLOUDS, *SHIP SIGNATURES, TIME INTERVALS, OPTICAL PROPERTIES, AEROSOLS, HIGH RATE, PHYSICAL PROPERTIES, GROWTH(GENERAL), RATES, THESES, FAR FIELD, CASE STUDIES, PATTERNS, WIDTH, VALUE, TELEMETERING DATA, STANDARD DEVIATION, ALBEDO.

Subject Categories : Meteorology
      Miscellaneous Detection and Detectors
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE