A 4DVAR System for the Navy Coastal Ocean Model. Part 2: Strong and Weak Constraint Assimilation Experiments with Real Observations in Monterey Bay

Abstract

A four-dimensional variational data assimilation (4DVAR) system was recently developed for the Navy Coastal Ocean Model (NCOM). The system was tested in the first part of this study using synthetic surface and subsurface data. Here, a full range of real surface and subsurface data is considered following encouraging results from the preliminary test. The data include sea surface temperature and sea surface height from satellite, as well as subsurface observations from gliders deployed during the second Autonomous Ocean Sampling Network field experiment in California's Monterey Bay. Data assimilation is carried out with strong and weak constraints, and results are compared against independent observations. This study clearly shows that the 4DVAR approach improves the free-running model simulation and that the weak constraint experiment has lower analysis errors than does the strong constraint version.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2014
Accession Number
ADA604742

Entities

People

  • Hans E. Ngodock
  • Matthew Carrier

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Acquisition
  • Algorithms
  • Artificial Satellites
  • Assimilation
  • California
  • Data Acquisition
  • Four Dimensional
  • Heat Flux
  • Military Research
  • Nonlinear Dynamics
  • Observation
  • Sea Surface Temperature
  • Simulations
  • Standards
  • Surface Temperature
  • Trajectories
  • Wind

Fields of Study

  • Environmental science

Readers

  • Acoustical Oceanography.
  • Atmospheric Science/Meteorology
  • Operations Research

Technology Areas

  • Autonomy
  • Space