Accession Number : ADA298493

Title :   A Case Study of Diurnal Variation of Convection and Mesoscale Modeling During Toga-Coare,

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Waring, Patrick L.

PDF Url : ADA298493

Report Date : DEC 1994

Pagination or Media Count : 93

Abstract : Infrared satellite images from the TOGA-COARE domain have been objectively processed to reveal the distribution of cloud clusters with temperatures of a given threshold for two 48-h periods (14-15 January and 18-19 January 1993). old cloudiness is examined with a threshold of less than 2O8K and moderately cold cloudiness is examined with a threshold of less than 235K. Cloud cluster sizes are found to have a log-normal distribution. Cluster size ranges for the given temperature thresholds are found to be smaller for 14-15 January than for 18-19 January, and smaller overall than previous climatological studies. Due to synoptic scale variability, the diurnal cycle is more apparent during 18-19 January with deep convection peaking before dawn, and then moderately cold cloud area expanding in the afternoon. Smaller clusters have a smaller diurnal signal than larger clusters. The NPS/NRL mesoscale model demonstrates skill in the forecast of total cloud cover with a model integration of up to 24 hours. The model is found to over forecast cloud cluster size and to show minimal skill in depicting a diurnal signal in convection.

Descriptors :   *CLOUD COVER, *ATMOSPHERE MODELS, *DIURNAL VARIATIONS, *CONVECTION(ATMOSPHERIC), CLOUDS, DISTRIBUTION, THESES, METEOROLOGICAL SATELLITES, WEATHER FORECASTING, CYCLES, CLUSTERING, CASE STUDIES, INFRARED IMAGES, CLIMATOLOGY, TWILIGHT.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE