Temporal effects of shiptracks on clouds
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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.
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Salvato, Gregory (Monterey, California. Naval Postgraduate School, 1992-03);Radiative and physical characteristics of subtropic and Arctic shiptracks are compared through the use of AVHRR satellite data and an algorithm developed at the Naval Postgraduate School. Examination of channels 1 and 3 ...
Analysis of shiptrack persistence with insitu cloud measurements and satellite retrieved reflectance Tessmer, Scott A. (Monterey, California. Naval Postgraduate School, 1996-03);Shiptracks detected on Advanced Very High Resolution Radiometer (AVHRR) satellite images posses longer detection lives and down-track brightness than expected. A simple model of physical processes is developed to correlate ...
Shiptracks in the Californian stratus region: dependency on marine atmospheric boundary layer depth Trehubenko, Eric J. (Monterey, California. Naval Postgraduate School, 1994-12);Analysis of AVHRR (Advanced Very High Resolution Radiometer) satellite image/atmospheric sounding pairs reveals that the development and persistence of shiptracks is dependent on Marine Atmospheric Boundary Layer Depth ...