
NSF Org: |
OCE Division Of Ocean Sciences |
Recipient: |
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Initial Amendment Date: | February 25, 2005 |
Latest Amendment Date: | February 25, 2005 |
Award Number: | 0452744 |
Award Instrument: | Standard Grant |
Program Manager: |
Eric C. Itsweire
OCE Division Of Ocean Sciences GEO Directorate for Geosciences |
Start Date: | March 1, 2005 |
End Date: | February 29, 2008 (Estimated) |
Total Intended Award Amount: | $181,743.00 |
Total Awarded Amount to Date: | $181,743.00 |
Funds Obligated to Date: |
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History of Investigator: |
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Recipient Sponsored Research Office: |
1000 E UNIVERSITY AVE LARAMIE WY US 82071-2000 (307)766-5320 |
Sponsor Congressional District: |
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Primary Place of Performance: |
1000 E UNIVERSITY AVE LARAMIE WY US 82071-2000 |
Primary Place of
Performance Congressional District: |
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Unique Entity Identifier (UEI): |
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Parent UEI: |
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NSF Program(s): | PHYSICAL OCEANOGRAPHY |
Primary Program Source: |
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Program Reference Code(s): |
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Program Element Code(s): |
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Award Agency Code: | 4900 |
Fund Agency Code: | 4900 |
Assistance Listing Number(s): | 47.050 |
ABSTRACT
ABSTRACT
OCE-0452744-0452265
Oceanic finestructure can be imaged in great detail using low-frequency (10-150 Hz) seismic reflection profiling. In September 2003, a joint hydrographic/seismic imaging survey of oceanic finestructure was conducted, acquiring temperature and salinity data on 110 XBT.s and 12 XCTD.s as a low-cost piggyback to a previously scheduled seismic reflection study in the Norwegian Sea. Initial results showed that the reflection method (1) is sensitive to fine-scale temperature contrasts as small as 0.03 C; (2) can image finestructure from M2 internal tides and map the sites of M2 internal tide generation; (3) can map water-mass boundaries in great detail; (4) can produce quantitative internal wave spectra that reproduce the expected Garrett-Munk spectrum and deviations from it; and (5) can image disruptions in finestructure consistent with internal wave on critical continental slopes.
This proposal will focus on analysis of the data, targeting the following questions: (1) How can we best extract quantitative information on internal wave displacement spectra and vertical
coherence from acoustic images of finestructure? (2) What are the characteristics of the internal wave field in the thermocline of Norwegian Sea, and are there systematics with depth, distance from continental slope, and bottom topography? (3) Is high-wavenumber internal wave energy enhanced at sites near critical continental slopes? (4) Where are M2 internal tides generated on the Norwegian continental slope, and are there systematics with slope angle and tidal cycle? (5) What is the relationship of imaged reflectors to the geostrophic velocity field? (6) What is the shape of the deep water mass boundaries revealed in the various sections?
This work is a logical next step in determining the capabilities and limitations of low-frequency acoustic imaging to study ocean structures and dynamics.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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