Oceanatmosphere simulations of the Eastern Mediterranean using COAMPSTMNCOM

Ocean-atmosphere simulations of the Eastern Mediterranean using COAMPSTM/NCOM Julie Pullen Paul Martin James Doyle Richard Hodur Objectives §Simulate Mediterranean and subregional (e. g. , Adriatic and Aegean Seas) atmospheric and oceanic circulation at high resolution as a testbed for investigating ocean/atmosphere coupling strategies §Document and understand response of marginal seas to forcing by strong winds and river run-off/outflow from adjacent water bodies §Aid in planning of field campaigns and employ observational data for model validation and data assimilation

Outline § Model configuration § Model forcing § Simulations during etesian wind events

Domain Configuration 81 km COAMPS 27 km Momentum, Heat fluxes 6 km NCOM TM

Nesting for Focus on Adriatic Sea 81 km COAMPS TM 36 km COAMPS TM 12 km 27 km 4 km 2 km NCOM Momentum, Heat fluxes Initial conditions and lateral boundary forcing 6 km NCOM

2 km NCOM Aegean Sea nest (Paul Martin)

COAMPSTM/ atmosphere MVOI Features § Analysis: multivariate OI of winds and heights (univariate of temperature and moisture) ingests observations from radiosondes, surface observations, aircraft, and satellites § Model: Non-hydrostatic, C-grid, sigma vertical coordinate Specifications § 81/ 27 km, 30 levels § grid size of inner nest: 193 x 97 § 12 hr incremental data assimilation cycle with 24 hr forecast § reanalysis has been run for Oct 1998 – June 2002, and is ongoing

Features NCOM § Ocean model based on POM: C-grid, hybrid sigma-z vertical coordinate, options for parametrization of turbulence, order of advection scheme (Paul Martin, NRL-Stennis) § forced by hourly COAMPS TM momentum and heat fluxes Specifications § 6 km, 40 levels (15 sigma levels) § grid size: 576 x 288 § starting from multi-year spin-up beginning 1999 §climatological river discharge from 54 major rivers

NCOM Bathymetry in the Aegean

Simulations (summer 2001) § COAMPS Eastern Mediterranean wind § COAMPS/NCOM Aegean wind/surface elevation § NCOM climatological simulation with BSW