Evaluation of COAMPS Mesoscale Modeling in the Persian Gulf Region
NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY
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The US Navy conducted a Ship ASW Readiness and Effectiveness Measuring exercise SHAREM 110 in the Persian Gulf during 5-17 February 1995. As part of SHAREM, additional mesoscale measurements were made by ships and aircraft. After the exercise, the Naval Research Laboratory, Monterey ran the research version of the Navy Coupled OceanAtmosphere Mesoscale Prediction System COAMPS for the entire SHAREM period, without incorporating the mesoscale observations into model data assimilation. The purpose of this research is to study the mesoscale features in the SHAREM data set and to evaluate the COAMPS predictions of these phenomena. The period of 8-11 February 1995 includes three distinct synoptic and mesoscale phenomena, which will be studied in this paper. A mesoscale disturbance is evident in ship soundings and aircraft data on 8 February, in advance of a cold front. The front passed through the Persian Gulf on 9 February, and ship and aircraft data for that day shows subsidence, drying, and establishment of a strong inversion behind the front. A Shamal occurs on 10-11 February. Aircraft and ship data on 11 February provide in situ measurements of the Shamal and the resultant deep mixed layer in the Persian Gulf. This paper includes evaluations of COAMPS at three separate times 06-12 UTC 8 February, 06 UTC 9 February, and 06 UTC 11 February 1995. In addition, evaluation of COAMPS for a period of strong land-sea breeze circulations during 14-15 February will be reported at the conference.