Accession Number:

ADA261297

Title:

Ship Tracks: A Geographical and Statistical Study

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1992-12-01

Pagination or Media Count:

72.0

Abstract:

Anomalous cloud lines are frequently seen in satellite images as curvilinear features. These cloud lines or ship tracks are likely due to products of ship-produced hot exhaust gases that are expelled into the atmosphere, increasing the aerosol concentration in the ship track plume. NOAA 9 and 10 AVHRR data are sensitive to cloud droplet size and show the ship tracks as increases in radiance due to reflectance. Twenty eight NOAA 910 satellite passes are analyzed. Twenty two of the passes are found to contain a total of 316 ship tracks which is significantly more than that expected by earlier ship track studies. An existing ship track detection algorithm is used to conduct a statistical comparison of ship track and non-ship track, or ambient pixel reflectance of the NOAA 9 and 10 AVHRR channels 1 0.63 um, 3 3.7 um, and 4 11 um. The results of the statistical analysis confirm, as found in previous studies, that the ship track pixels displayed a significant increase in values for channels 1 and 3 and a very slight increase for channel 4.

Subject Categories:

  • Statistics and Probability
  • Marine Engineering
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE