Accession Number ADA562885
Title What is Required to Model the Global Ocean Circulation.
Publication Date 2011
Media Count 8p
Personal Author A. J. Wallcraft J. G. Richman P. G. Thoppil P. J. Hogan
Abstract Simulating and forecasting the circulation of the global ocean is a difficult task. The present generation of high-resolution ocean circulation models, with horizontal resolution of approx. 1/10, appears to be deficient in kinetic energy when compared with long-term observations. A series of near-twin experiments, using the global HYbrid Coordinate Ocean Model (HYCOM) with identical atmospheric forcing, but varying in horizontal resolution and assimilation of altimetric steric height anomalies, show significant improvement with a better representation of mesoscale eddies when compared to observations. For a 1/12.5 (approximately 9 km) global model, the eddy kinetic energy (EKE) at the surface and abyss is low by approx. 21% and approx. 24%, respectively, compared to surface drifting buoys and deep current meters. Increasing the model resolution to 1/25 (approx. 4.4 km) or injecting mesoscale eddies through the assimilation of surface observations in a 1/12.5 model increases the surface and abyssal EKE to levels consistent with observations.
Keywords Abyssal zones
Assimilation
Buoys
Circulation
Data assimilation
Deep oceans
Drift
Eddies(Fluid mechanics)
Energy
Flowmeters
Forecasting
Global
High resolution
Horizontal orientation
Kinetic energy
Models
Ocean circulation modeling
Ocean currents
Ocean tides
Oceans
Resolution
Surfaces


 
Source Agency Non Paid ADAS
NTIS Subject Category 47B - Dynamic Oceanography
47C - Physical & Chemical Oceanography
46B - Fluid Mechanics
Corporate Author Naval Research Lab., Stennis Space Center, MS. Oceanography Div.
Document Type Technical report
Title Note Conference paper.
NTIS Issue Number 1226
Contract Number NRL/PP/7320--12-0721

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