High-Frequency Radar Data Assimilation in the Monterey Bay
I. Shulman, C. -R. Wu
COAM, USM, Stennis Space Center, MS
J.K. Lewis
Scientific Solution, Inc., Kalaheo, HI
J.D. Paduan, S.R. Ramp, L.K. Rosenfeld
Naval Postgraduate School, Monterey, CA
The modeling objective of the NOPP An Innovative
Coastal-Ocean Observing Network (ICON) project is to demonstrate
the capability of a high-resolution model to track the major features in an
upwelling system when constrained by the proposed measurement suite and
nested within a regional model. To achieve this research objective, the
fine-resolution numerical ocean model of the Monterey Bay Area (ICON model)
was constructed. The major elements of the ICON model are the same as those
used by the Navy's prediction systems: the Princeton Ocean Model (POM)-based
ICON ocean model is coupled to a larger-scale version of the Pacific West Coast
(PWC) model of the CoBALT project; the ICON model is forced with products
from the high-resolution, state-of-the-art Navy atmospheric models NOGAPS and
COAMPS; the ICON model is capable of assimilating HF radar-derived surface
currents and MCSST data. The HF radar data assimilation component of the
ICON model will be discussed in this presentation.
The challenge is to find a modeling strategy to utilize HF radar-derived
surface current information with a sophisticated hydrodynamic model in order
to improve model predictions.
Effective data assimilation techniques for surface information rely on
methods for projecting this information into the interior of the ocean.
For this reason, special attention in our presentation will be devoted
to the sub-surface projection of CODAR-derived surface information in
three-dimensional data assimilation of surface currents.
Different approaches based on the modification of the ICON model
surface forcing (wind forcing) as well as direct instantaneous projection
of surface information into the subsurface of the model will be presented and
compared.