Higher Frequency Ambient Noise in the Arctic Ocean.
Higher frequency (1000 Hz) arctic ambient noise episodes during non-summer months were used to study generating mechanisms. In most cases, thermal fracturing of sea ice was responsible. A suite of heating and cooling processes that relate to thermal fracturing of sea ice were considered. Numerical s...
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ftdtic:ADA192203 2023-05-15T13:10:50+02:00 Higher Frequency Ambient Noise in the Arctic Ocean. Lewis, James K Denner, Warren W SCIENCE APPLICATIONS INTERNATIONAL CORP COLLEGE STATION TX 1988-01 text/html http://www.dtic.mil/docs/citations/ADA192203 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA192203 en eng http://www.dtic.mil/docs/citations/ADA192203 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Acoustics *AMBIENT NOISE *ARCTIC OCEAN *SEA ICE *NOISE(SOUND) *CRACKING(FRACTURING) ALBEDO ARCTIC REGIONS ATMOSPHERIC TEMPERATURE BALANCES BROADBAND CLOUD COVER COOLING CYCLES DAILY OCCURRENCE HEAT HEAT BALANCE HEAT FLUX HEATING ICE FOG LEVEL(QUANTITY) NOISE GENERATORS NUMERICAL ANALYSIS RADIATION SCALE SHORT RANGE(TIME) SNOW SNOW COVER SOLAR RADIATION SPATIAL DISTRIBUTION WIND VELOCITY PE61153N Text 1988 ftdtic 2016-02-19T11:03:28Z Higher frequency (1000 Hz) arctic ambient noise episodes during non-summer months were used to study generating mechanisms. In most cases, thermal fracturing of sea ice was responsible. A suite of heating and cooling processes that relate to thermal fracturing of sea ice were considered. Numerical simulations with a daily heating cycle and no snow cover implied that maximum noise levels occurred at 1900 hrs local. Radiational heat balances are more important than sensible heat flux in producing fracturing of sea ice. With snow cover, the amount of ice fracturing is reduced. A daily heating cycle produces maximum fracturing at 0300 to 0800 hrs local, a common feature seen in observed noise data. Simulations were made using observed Arctic Ocean solar radiation, air temperature, wind speed, albedo, and cloud cover from the spring of 1976. The agreement between the model ice fracturing parameter and the observed 1000 Hz noise levels was excellent. However, results indicate that blowing snow and ice fog may be additional factors in the heat flux balance of sea ice. The short space scales of higher frequency, arctic ambient noise are likely a result of spatial variations in snow cover. The short time scales of such noise are not only a result of multiple noise-generating processes but also changes in cloud and snow cover. Results indicate that thermal fracturing of sea ice can produce broad-band noise. There are clear examples of 32 Hz noise variations associated with thermal fracturing of sea ice. Text albedo Arctic Arctic Ocean Sea ice Defense Technical Information Center: DTIC Technical Reports database Arctic Arctic Ocean |
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Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Acoustics *AMBIENT NOISE *ARCTIC OCEAN *SEA ICE *NOISE(SOUND) *CRACKING(FRACTURING) ALBEDO ARCTIC REGIONS ATMOSPHERIC TEMPERATURE BALANCES BROADBAND CLOUD COVER COOLING CYCLES DAILY OCCURRENCE HEAT HEAT BALANCE HEAT FLUX HEATING ICE FOG LEVEL(QUANTITY) NOISE GENERATORS NUMERICAL ANALYSIS RADIATION SCALE SHORT RANGE(TIME) SNOW SNOW COVER SOLAR RADIATION SPATIAL DISTRIBUTION WIND VELOCITY PE61153N |
spellingShingle |
Acoustics *AMBIENT NOISE *ARCTIC OCEAN *SEA ICE *NOISE(SOUND) *CRACKING(FRACTURING) ALBEDO ARCTIC REGIONS ATMOSPHERIC TEMPERATURE BALANCES BROADBAND CLOUD COVER COOLING CYCLES DAILY OCCURRENCE HEAT HEAT BALANCE HEAT FLUX HEATING ICE FOG LEVEL(QUANTITY) NOISE GENERATORS NUMERICAL ANALYSIS RADIATION SCALE SHORT RANGE(TIME) SNOW SNOW COVER SOLAR RADIATION SPATIAL DISTRIBUTION WIND VELOCITY PE61153N Lewis, James K Denner, Warren W Higher Frequency Ambient Noise in the Arctic Ocean. |
topic_facet |
Acoustics *AMBIENT NOISE *ARCTIC OCEAN *SEA ICE *NOISE(SOUND) *CRACKING(FRACTURING) ALBEDO ARCTIC REGIONS ATMOSPHERIC TEMPERATURE BALANCES BROADBAND CLOUD COVER COOLING CYCLES DAILY OCCURRENCE HEAT HEAT BALANCE HEAT FLUX HEATING ICE FOG LEVEL(QUANTITY) NOISE GENERATORS NUMERICAL ANALYSIS RADIATION SCALE SHORT RANGE(TIME) SNOW SNOW COVER SOLAR RADIATION SPATIAL DISTRIBUTION WIND VELOCITY PE61153N |
description |
Higher frequency (1000 Hz) arctic ambient noise episodes during non-summer months were used to study generating mechanisms. In most cases, thermal fracturing of sea ice was responsible. A suite of heating and cooling processes that relate to thermal fracturing of sea ice were considered. Numerical simulations with a daily heating cycle and no snow cover implied that maximum noise levels occurred at 1900 hrs local. Radiational heat balances are more important than sensible heat flux in producing fracturing of sea ice. With snow cover, the amount of ice fracturing is reduced. A daily heating cycle produces maximum fracturing at 0300 to 0800 hrs local, a common feature seen in observed noise data. Simulations were made using observed Arctic Ocean solar radiation, air temperature, wind speed, albedo, and cloud cover from the spring of 1976. The agreement between the model ice fracturing parameter and the observed 1000 Hz noise levels was excellent. However, results indicate that blowing snow and ice fog may be additional factors in the heat flux balance of sea ice. The short space scales of higher frequency, arctic ambient noise are likely a result of spatial variations in snow cover. The short time scales of such noise are not only a result of multiple noise-generating processes but also changes in cloud and snow cover. Results indicate that thermal fracturing of sea ice can produce broad-band noise. There are clear examples of 32 Hz noise variations associated with thermal fracturing of sea ice. |
author2 |
SCIENCE APPLICATIONS INTERNATIONAL CORP COLLEGE STATION TX |
format |
Text |
author |
Lewis, James K Denner, Warren W |
author_facet |
Lewis, James K Denner, Warren W |
author_sort |
Lewis, James K |
title |
Higher Frequency Ambient Noise in the Arctic Ocean. |
title_short |
Higher Frequency Ambient Noise in the Arctic Ocean. |
title_full |
Higher Frequency Ambient Noise in the Arctic Ocean. |
title_fullStr |
Higher Frequency Ambient Noise in the Arctic Ocean. |
title_full_unstemmed |
Higher Frequency Ambient Noise in the Arctic Ocean. |
title_sort |
higher frequency ambient noise in the arctic ocean. |
publishDate |
1988 |
url |
http://www.dtic.mil/docs/citations/ADA192203 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA192203 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
albedo Arctic Arctic Ocean Sea ice |
genre_facet |
albedo Arctic Arctic Ocean Sea ice |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA192203 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766244287757942784 |