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Estimates of bottom flows and bottom boundary layer dissipation of the oceanic general circulation from global high resolution models

Estimates of bottom flows and bottom boundary layer dissipation of the oceanic general circulation from global high resolution models
Estimates of bottom flows and bottom boundary layer dissipation of the oceanic general circulation from global high resolution models
This paper (1) compares the bottom flows of three existing high-resolution global simulations of the oceanic general circulation to near-bottom flows in a current meter database and (2) estimates, from the simulations, the global energy dissipation rate of the general circulation by quadratic bottom boundary layer drag. The study utilizes a data-assimilative run of the Naval Research Laboratory Layered Ocean Model (NLOM), a nonassimilative run of NLOM, and a nonassimilative run of the Parallel Ocean Program z-level ocean model. Generally speaking, the simulations have some difficulty matching the flows in individual current meter records. However, averages of model values of (the time average of the cube of bottom velocity, which is proportional to the dissipation rate) computed over all the current meter sites agree to within a factor of 2.7 or better with averages computed from the current meters, at least in certain depth ranges. The models therefore likely provide reasonable order-of-magnitude estimates of areally integrated dissipation by bottom drag. Global dissipation rates range from 0.14 to 0.65 TW, suggesting that bottom drag represents a substantial sink of the ?1 TW wind-power transformed into geostrophic motions.
0148-0227
C02024
Arbic, Brian K.
297f49fc-6755-42f6-b6b2-6307bcd375a3
Shriver, Jay F.
80106075-e876-4bf4-92cd-a21b41ebb574
Hogan, Patrick J.
b8525408-9130-4578-9085-c698b9e2ee28
Hurlburt, Harley E.
f5b2ce5a-3bc8-4bb2-be9f-364c66f6f8f1
McClean, Julie L.
42dbbabc-6679-45bd-b581-bf7bcefea10d
Metzger, E. Joseph
cb0196f8-5d95-4b22-9cae-944f0edf092c
Scott, Robert B.
f82756a5-f04c-41f1-a6c8-12574b9814cf
Sen, Ayon
59af599f-deab-4c46-91ee-5d7233f5acad
Smedstad, Ole Martin
2bae5aec-181e-402d-9f0e-323242339cef
Wallcraft, Alan J.
46506527-d140-4a76-9ac6-c2362b88b197
Arbic, Brian K.
297f49fc-6755-42f6-b6b2-6307bcd375a3
Shriver, Jay F.
80106075-e876-4bf4-92cd-a21b41ebb574
Hogan, Patrick J.
b8525408-9130-4578-9085-c698b9e2ee28
Hurlburt, Harley E.
f5b2ce5a-3bc8-4bb2-be9f-364c66f6f8f1
McClean, Julie L.
42dbbabc-6679-45bd-b581-bf7bcefea10d
Metzger, E. Joseph
cb0196f8-5d95-4b22-9cae-944f0edf092c
Scott, Robert B.
f82756a5-f04c-41f1-a6c8-12574b9814cf
Sen, Ayon
59af599f-deab-4c46-91ee-5d7233f5acad
Smedstad, Ole Martin
2bae5aec-181e-402d-9f0e-323242339cef
Wallcraft, Alan J.
46506527-d140-4a76-9ac6-c2362b88b197

Arbic, Brian K., Shriver, Jay F., Hogan, Patrick J., Hurlburt, Harley E., McClean, Julie L., Metzger, E. Joseph, Scott, Robert B., Sen, Ayon, Smedstad, Ole Martin and Wallcraft, Alan J. (2009) Estimates of bottom flows and bottom boundary layer dissipation of the oceanic general circulation from global high resolution models. Journal of Geophysical Research, 114, C02024. (doi:10.1029/2008JC005072).

Record type: Article

Abstract

This paper (1) compares the bottom flows of three existing high-resolution global simulations of the oceanic general circulation to near-bottom flows in a current meter database and (2) estimates, from the simulations, the global energy dissipation rate of the general circulation by quadratic bottom boundary layer drag. The study utilizes a data-assimilative run of the Naval Research Laboratory Layered Ocean Model (NLOM), a nonassimilative run of NLOM, and a nonassimilative run of the Parallel Ocean Program z-level ocean model. Generally speaking, the simulations have some difficulty matching the flows in individual current meter records. However, averages of model values of (the time average of the cube of bottom velocity, which is proportional to the dissipation rate) computed over all the current meter sites agree to within a factor of 2.7 or better with averages computed from the current meters, at least in certain depth ranges. The models therefore likely provide reasonable order-of-magnitude estimates of areally integrated dissipation by bottom drag. Global dissipation rates range from 0.14 to 0.65 TW, suggesting that bottom drag represents a substantial sink of the ?1 TW wind-power transformed into geostrophic motions.

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Published date: 27 February 2009

Identifiers

Local EPrints ID: 73071
URI: https://eprints.soton.ac.uk/id/eprint/73071
ISSN: 0148-0227
PURE UUID: feefa70a-d4e7-4cbe-a268-4feed513e5ac

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Date deposited: 26 Feb 2010
Last modified: 18 Jul 2017 23:51

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Contributors

Author: Brian K. Arbic
Author: Jay F. Shriver
Author: Patrick J. Hogan
Author: Harley E. Hurlburt
Author: Julie L. McClean
Author: E. Joseph Metzger
Author: Robert B. Scott
Author: Ayon Sen
Author: Ole Martin Smedstad
Author: Alan J. Wallcraft

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