Alaska North Shore Ocean Acoustics Study
The changing Arctic climate has been altering air-sea interaction and physical oceanographic conditions in the regions. The long-term goals of this project is to acquire better understanding of the effects of changing ice cover, wind patterns and circulation/upwelling on underwater sound propagation...
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ftdtic:AD1024347 2023-05-15T14:55:21+02:00 Alaska North Shore Ocean Acoustics Study Lin,Ying-Tsong Woods Hole Oceanographic Institution Woods Hole United States 2015-09-30 text/html http://www.dtic.mil/docs/citations/AD1024347 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1024347 en eng http://www.dtic.mil/docs/citations/AD1024347 Approved For Public Release; Acoustics Physical and Dynamic Oceanography ALASKA underwater acoustics ARCTIC OCEAN acoustic propagation ambient noise ice wind UPWELLING CONTINENTAL SHELVES OCEAN CURRENTS bathymetry climate change pacific ocean observation models measurement elastic properties equations of motion PARTIAL DIFFERENTIAL EQUATIONS algorithms hydrophones underwater sound ocean acoustics Alaska North Shore shelfbreaks ice cover halocline sound ducts shelfbreak circulation seabed variations sea ice Canada Basin Beaufort Sea pe (parabolic-equation) pe method canap (Canada Basin Acoustic Propagation Experiment) SHRU (Several Hydrophone Receiver Unit) Text 2015 ftdtic 2017-07-23T14:48:24Z The changing Arctic climate has been altering air-sea interaction and physical oceanographic conditions in the regions. The long-term goals of this project is to acquire better understanding of the effects of changing ice cover, wind patterns and circulation/upwelling on underwater sound propagation and ambient noise in the areas of continental shelves and shelfbreak on Alaska north shore. The potential relevance of this work to the Navy is on increasing the capability of Naval sonar systems in Arctic oceans. The overall research goal of our study is to understand the physical effects of the changing oceanographic conditions in Arctic oceans on sound propagation and ambient noise, and the focuses are on the influences of (1) ice cover, (2) halocline sound ducts, (3) shelfbreak circulation, and (4) bathymetric and seabed variations.Because of the warming climate, the summertime ice extent on the Chukchi/Beaufort shelves and in the adjacent Canada Basin has decreased drastically over the last decade. As a result, the sea ice has become younger and more mobile [1]. A presumed primary acoustical consequence of this altered ice condition is reduction of transmission loss. Also, the increased ice mobility has led to stronger upwelling at the Chukchi and Beaufort shelf edge in conjunction with enhanced easterly winds [2-3]. This in turn significantly alters the hydrographic conditions of the water column, with strong ramifications for sound propagation.Underwater sound propagation in the Canada Basin and the Beaufort Sea can be efficient through the sound duct formed within the Pacific-water halocline layer located about 50-250 m below surface (see Figure 1). In the deep basin, the structure of this water-borne acoustic duct can be perturbed by the abundant subsurface eddies with diameters on the order of 20 km. It is estimated that the Canada Basin is filled with 100-200 of these eddies at any given time [4-6]. Text Arctic Arctic Ocean Beaufort Sea canada basin Chukchi Climate change Sea ice Alaska Defense Technical Information Center: DTIC Technical Reports database Arctic Arctic Ocean Canada Pacific Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Acoustics Physical and Dynamic Oceanography ALASKA underwater acoustics ARCTIC OCEAN acoustic propagation ambient noise ice wind UPWELLING CONTINENTAL SHELVES OCEAN CURRENTS bathymetry climate change pacific ocean observation models measurement elastic properties equations of motion PARTIAL DIFFERENTIAL EQUATIONS algorithms hydrophones underwater sound ocean acoustics Alaska North Shore shelfbreaks ice cover halocline sound ducts shelfbreak circulation seabed variations sea ice Canada Basin Beaufort Sea pe (parabolic-equation) pe method canap (Canada Basin Acoustic Propagation Experiment) SHRU (Several Hydrophone Receiver Unit) |
spellingShingle |
Acoustics Physical and Dynamic Oceanography ALASKA underwater acoustics ARCTIC OCEAN acoustic propagation ambient noise ice wind UPWELLING CONTINENTAL SHELVES OCEAN CURRENTS bathymetry climate change pacific ocean observation models measurement elastic properties equations of motion PARTIAL DIFFERENTIAL EQUATIONS algorithms hydrophones underwater sound ocean acoustics Alaska North Shore shelfbreaks ice cover halocline sound ducts shelfbreak circulation seabed variations sea ice Canada Basin Beaufort Sea pe (parabolic-equation) pe method canap (Canada Basin Acoustic Propagation Experiment) SHRU (Several Hydrophone Receiver Unit) Lin,Ying-Tsong Alaska North Shore Ocean Acoustics Study |
topic_facet |
Acoustics Physical and Dynamic Oceanography ALASKA underwater acoustics ARCTIC OCEAN acoustic propagation ambient noise ice wind UPWELLING CONTINENTAL SHELVES OCEAN CURRENTS bathymetry climate change pacific ocean observation models measurement elastic properties equations of motion PARTIAL DIFFERENTIAL EQUATIONS algorithms hydrophones underwater sound ocean acoustics Alaska North Shore shelfbreaks ice cover halocline sound ducts shelfbreak circulation seabed variations sea ice Canada Basin Beaufort Sea pe (parabolic-equation) pe method canap (Canada Basin Acoustic Propagation Experiment) SHRU (Several Hydrophone Receiver Unit) |
description |
The changing Arctic climate has been altering air-sea interaction and physical oceanographic conditions in the regions. The long-term goals of this project is to acquire better understanding of the effects of changing ice cover, wind patterns and circulation/upwelling on underwater sound propagation and ambient noise in the areas of continental shelves and shelfbreak on Alaska north shore. The potential relevance of this work to the Navy is on increasing the capability of Naval sonar systems in Arctic oceans. The overall research goal of our study is to understand the physical effects of the changing oceanographic conditions in Arctic oceans on sound propagation and ambient noise, and the focuses are on the influences of (1) ice cover, (2) halocline sound ducts, (3) shelfbreak circulation, and (4) bathymetric and seabed variations.Because of the warming climate, the summertime ice extent on the Chukchi/Beaufort shelves and in the adjacent Canada Basin has decreased drastically over the last decade. As a result, the sea ice has become younger and more mobile [1]. A presumed primary acoustical consequence of this altered ice condition is reduction of transmission loss. Also, the increased ice mobility has led to stronger upwelling at the Chukchi and Beaufort shelf edge in conjunction with enhanced easterly winds [2-3]. This in turn significantly alters the hydrographic conditions of the water column, with strong ramifications for sound propagation.Underwater sound propagation in the Canada Basin and the Beaufort Sea can be efficient through the sound duct formed within the Pacific-water halocline layer located about 50-250 m below surface (see Figure 1). In the deep basin, the structure of this water-borne acoustic duct can be perturbed by the abundant subsurface eddies with diameters on the order of 20 km. It is estimated that the Canada Basin is filled with 100-200 of these eddies at any given time [4-6]. |
author2 |
Woods Hole Oceanographic Institution Woods Hole United States |
format |
Text |
author |
Lin,Ying-Tsong |
author_facet |
Lin,Ying-Tsong |
author_sort |
Lin,Ying-Tsong |
title |
Alaska North Shore Ocean Acoustics Study |
title_short |
Alaska North Shore Ocean Acoustics Study |
title_full |
Alaska North Shore Ocean Acoustics Study |
title_fullStr |
Alaska North Shore Ocean Acoustics Study |
title_full_unstemmed |
Alaska North Shore Ocean Acoustics Study |
title_sort |
alaska north shore ocean acoustics study |
publishDate |
2015 |
url |
http://www.dtic.mil/docs/citations/AD1024347 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1024347 |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) |
geographic |
Arctic Arctic Ocean Canada Pacific Beaufort Shelf |
geographic_facet |
Arctic Arctic Ocean Canada Pacific Beaufort Shelf |
genre |
Arctic Arctic Ocean Beaufort Sea canada basin Chukchi Climate change Sea ice Alaska |
genre_facet |
Arctic Arctic Ocean Beaufort Sea canada basin Chukchi Climate change Sea ice Alaska |
op_relation |
http://www.dtic.mil/docs/citations/AD1024347 |
op_rights |
Approved For Public Release; |
_version_ |
1766327151523528704 |