Accession Number : ADA484789


Title :   Short-term Influences on Suspended Particulate Matter Distribution in the Northern Gulf of Mexico: Satellite and Model Observations


Descriptive Note : Journal article


Corporate Author : NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV


Personal Author(s) : D'Sa, Eurico J. ; Ko, Dong S.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA484789


Report Date : 15 JUL 2008


Pagination or Media Count : 17


Abstract : Energetic meteorological events such as frontal passages and hurricanes often impact coastal regions in the northern Gulf of Mexico that influence geochemical processes in the region. Satellite remote sensing data such as winds from QuikSCAT, suspended particulate matter (SPM) concentrations derived from SeaWiFS and the outputs (sea level and surface ocean currents) of a nested navy coastal ocean model (NCOM) were combined to assess the effects of frontal passages between 23-28 March 2005 on the physical properties and the SPM characteristics in the northern Gulf of Mexico. Typical changes in wind speed and direction associated with frontal passages were observed in the latest 12.5 km wind product from QuikSCAT with easterly winds before the frontal passage undergoing systematic shifts in direction and speed and turning northerly, northwesterly during a weak and a strong front on 23 and 27 March, respectively. A quantitative comparison of model sea level results with tide gauge observations suggest better correlations near the delta than in the western part of the Gulf with elevated sea levels along the coast before the frontal passage and a large drop in sea level following the frontal passage on 27 March. Model results of surface currents suggested strong response to wind forcing with westward and onshore currents before the frontal passage reversing into eastward, southeastward direction over a six day period from 23 to 28 March 2005.


Descriptors :   *OCEAN MODELS , MEXICO GULF , OCEAN CURRENTS , PHYSICAL PROPERTIES , WIND , SUSPENDED SEDIMENTS , REMOTE DETECTORS , METEOROLOGY , WIND VELOCITY , PARTICULATES , ENERGETIC PROPERTIES , MISSISSIPPI RIVER , GEOCHEMISTRY , REPRINTS , COASTAL REGIONS


Subject Categories : PHYSICAL AND DYNAMIC OCEANOGRAPHY


Distribution Statement : APPROVED FOR PUBLIC RELEASE