Accession Number : ADA294649

Title :   Performance of the Navy's Second Order Closure Version of the NORAPS In Short-Range Refractivity Forecasting During the VOCAR Experiment.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB MONTEREY CA

Personal Author(s) : Vogel, Gerard N.

PDF Url : ADA294649

Report Date : APR 1995

Pagination or Media Count : 53

Abstract : In conjunction with the Variability of Coastal Atmospheric Refractivity (VOCAR) experiment conducted during late summer 1993 in the Southern California bight region, twice-daily 24 hr forecasts from a second order closure version of the Navy Operational Regional Atmospheric Prediction System (NORAPS) were made. The results from a validation of the model's performance in short-range refractivity forecasting during VOCAR are presented, based on statistical comparisons of model and radiosonde surface and elevated duct occurrence, and trapping layer heights and intensities. Spatial and temporal (diurnal and synoptic) variability of both forecast and observed ducting are discussed. The impact on refractive structure of data assimilation with an incremental update procedure is also examined.

Descriptors :   *MARINE ATMOSPHERES, *ATMOSPHERIC REFRACTION, COASTAL REGIONS, OCEAN SURFACE, VALIDATION, FORECASTING, SHORT RANGE(TIME), DUCTS, RADIOSONDES, ASSIMILATION, ATMOSPHERE MODELS.

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE