Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths
It was suggested by Munk and Forbes (1989) that climate induced changes in ocean temperature may be monitored by measurements of cross-basin acoustic travel time variability. The feasibility of such a monitoring system depends on the spatial and temporal variability of the cross-basin acoustic paths...
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ftdtic:ADA241544 2023-05-15T16:33:56+02:00 Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths Ort, Coenraad M. NAVAL POSTGRADUATE SCHOOL MONTEREY CA 1990-12 text/html http://www.dtic.mil/docs/citations/ADA241544 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA241544 en eng http://www.dtic.mil/docs/citations/ADA241544 Approved for public release; distribution is unlimited. DTIC AND NTIS Biological Oceanography *SIMULATION TEMPERATURE UNITED STATES OPTIMIZATION COASTAL REGIONS MONITORING SITES PATHS ANGLE OF ARRIVAL THESES VARIATIONS CODING THREE DIMENSIONAL SCALE RECEIVERS CLIMATE ACOUSTICS CALIFORNIA OCEANS ARRIVAL AZIMUTH TRAJECTORIES WEST(DIRECTION) RAY TRACING HEARING MULTIPATH TRANSMISSION TRAVEL TIME INDIAN OCEAN HAMILTONIAN FUNCTIONS OREGON SOUND GENERATORS POSITION(LOCATION) *HAMILTONIAN RAYTRACING GREENHOUSE WARNING CROSS-BASIN ACOUSTIC RAYTRACING Text 1990 ftdtic 2016-02-22T19:18:20Z It was suggested by Munk and Forbes (1989) that climate induced changes in ocean temperature may be monitored by measurements of cross-basin acoustic travel time variability. The feasibility of such a monitoring system depends on the spatial and temporal variability of the cross-basin acoustic paths in the presence of ocean variability of many different scales. For this thesis the variations in arrival position, azimuthal arrival angle, ray trajectory and the corresponding changes in travel times along the three- dimensional multipaths due to meso- and gyre scale ocean temperature fluctuations were analyzed. Emphasis was placed on the acoustic paths from Heard Island in the Indian Ocean, the proposed location for the sound source, to the west coast of the United States. An optimal receiver site location was found to exist in the vicinity of Monterey Bay, California. The possibility of a proposed listening site location near Coos Bay, Oregon, was also examined. However, the ray paths to Coos Bay interact with the bottom frequently, thus rendering them less reliable. All the ray traces for this study were carried out using the recently upgraded Hamiltonian raytracing code HARPO, interfaced with output form the Semtner-Chervin eddy resolving global ocean general circulation model. This interface allows for a realistic simulation of the effects of meso- and gyre scale processes on the variability of the various cross-basin paths. Text Heard Island Defense Technical Information Center: DTIC Technical Reports database Heard Island Indian Forbes ENVELOPE(-66.550,-66.550,-67.783,-67.783) Munk ENVELOPE(-95.993,-95.993,55.979,55.979) |
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Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Biological Oceanography *SIMULATION TEMPERATURE UNITED STATES OPTIMIZATION COASTAL REGIONS MONITORING SITES PATHS ANGLE OF ARRIVAL THESES VARIATIONS CODING THREE DIMENSIONAL SCALE RECEIVERS CLIMATE ACOUSTICS CALIFORNIA OCEANS ARRIVAL AZIMUTH TRAJECTORIES WEST(DIRECTION) RAY TRACING HEARING MULTIPATH TRANSMISSION TRAVEL TIME INDIAN OCEAN HAMILTONIAN FUNCTIONS OREGON SOUND GENERATORS POSITION(LOCATION) *HAMILTONIAN RAYTRACING GREENHOUSE WARNING CROSS-BASIN ACOUSTIC RAYTRACING |
spellingShingle |
Biological Oceanography *SIMULATION TEMPERATURE UNITED STATES OPTIMIZATION COASTAL REGIONS MONITORING SITES PATHS ANGLE OF ARRIVAL THESES VARIATIONS CODING THREE DIMENSIONAL SCALE RECEIVERS CLIMATE ACOUSTICS CALIFORNIA OCEANS ARRIVAL AZIMUTH TRAJECTORIES WEST(DIRECTION) RAY TRACING HEARING MULTIPATH TRANSMISSION TRAVEL TIME INDIAN OCEAN HAMILTONIAN FUNCTIONS OREGON SOUND GENERATORS POSITION(LOCATION) *HAMILTONIAN RAYTRACING GREENHOUSE WARNING CROSS-BASIN ACOUSTIC RAYTRACING Ort, Coenraad M. Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths |
topic_facet |
Biological Oceanography *SIMULATION TEMPERATURE UNITED STATES OPTIMIZATION COASTAL REGIONS MONITORING SITES PATHS ANGLE OF ARRIVAL THESES VARIATIONS CODING THREE DIMENSIONAL SCALE RECEIVERS CLIMATE ACOUSTICS CALIFORNIA OCEANS ARRIVAL AZIMUTH TRAJECTORIES WEST(DIRECTION) RAY TRACING HEARING MULTIPATH TRANSMISSION TRAVEL TIME INDIAN OCEAN HAMILTONIAN FUNCTIONS OREGON SOUND GENERATORS POSITION(LOCATION) *HAMILTONIAN RAYTRACING GREENHOUSE WARNING CROSS-BASIN ACOUSTIC RAYTRACING |
description |
It was suggested by Munk and Forbes (1989) that climate induced changes in ocean temperature may be monitored by measurements of cross-basin acoustic travel time variability. The feasibility of such a monitoring system depends on the spatial and temporal variability of the cross-basin acoustic paths in the presence of ocean variability of many different scales. For this thesis the variations in arrival position, azimuthal arrival angle, ray trajectory and the corresponding changes in travel times along the three- dimensional multipaths due to meso- and gyre scale ocean temperature fluctuations were analyzed. Emphasis was placed on the acoustic paths from Heard Island in the Indian Ocean, the proposed location for the sound source, to the west coast of the United States. An optimal receiver site location was found to exist in the vicinity of Monterey Bay, California. The possibility of a proposed listening site location near Coos Bay, Oregon, was also examined. However, the ray paths to Coos Bay interact with the bottom frequently, thus rendering them less reliable. All the ray traces for this study were carried out using the recently upgraded Hamiltonian raytracing code HARPO, interfaced with output form the Semtner-Chervin eddy resolving global ocean general circulation model. This interface allows for a realistic simulation of the effects of meso- and gyre scale processes on the variability of the various cross-basin paths. |
author2 |
NAVAL POSTGRADUATE SCHOOL MONTEREY CA |
format |
Text |
author |
Ort, Coenraad M. |
author_facet |
Ort, Coenraad M. |
author_sort |
Ort, Coenraad M. |
title |
Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths |
title_short |
Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths |
title_full |
Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths |
title_fullStr |
Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths |
title_full_unstemmed |
Spatial and Temporal Variability of Cross-Basin Acoustic Ray Paths |
title_sort |
spatial and temporal variability of cross-basin acoustic ray paths |
publishDate |
1990 |
url |
http://www.dtic.mil/docs/citations/ADA241544 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA241544 |
long_lat |
ENVELOPE(-66.550,-66.550,-67.783,-67.783) ENVELOPE(-95.993,-95.993,55.979,55.979) |
geographic |
Heard Island Indian Forbes Munk |
geographic_facet |
Heard Island Indian Forbes Munk |
genre |
Heard Island |
genre_facet |
Heard Island |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA241544 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766023679402049536 |