Naval Research Laboratory

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Naval Research Laboratory
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

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Naval Research Laboratory

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

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Naval Research Laboratory
Domain Configuration
81 km
COAMPSTM
27 km
6 km NCOM
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Naval Research Laboratory
Nesting for Focus on Adriatic Sea
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Naval Research Laboratory
2 km NCOM Aegean Sea nest (Paul Martin)
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Naval Research Laboratory
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

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Naval Research Laboratory
NCOM
Features

• 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 COAMPSTM 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

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Naval Research Laboratory
NCOM Bathymetry in the Aegean
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Naval Research Laboratory

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