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  • 1
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    A major ecosystem shift in the northern Bering Sea (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-03-11
    Description: Until recently, northern Bering Sea ecosystems were characterized by extensive seasonal sea ice cover, high water column and sediment carbon production, and tight pelagic-benthic coupling of organic production. Here, we show that these ecosystems are shifting away from these characteristics. Changes in biological communities are contemporaneous with shifts in regional atmospheric and hydrographic forcing. In the past decade, geographic displacement of marine mammal population distributions has coincided with a reduction of benthic prey populations, an increase in pelagic fish, a reduction in sea ice, and an increase in air and ocean temperatures. These changes now observed on the shallow shelf of the northern Bering Sea should be expected to affect a much broader portion of the Pacific-influenced sector of the Arctic Ocean.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grebmeier, Jacqueline M -- Overland, James E -- Moore, Sue E -- Farley, Ed V -- Carmack, Eddy C -- Cooper, Lee W -- Frey, Karen E -- Helle, John H -- McLaughlin, Fiona A -- McNutt, S Lyn -- New York, N.Y. -- Science. 2006 Mar 10;311(5766):1461-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Marine Biogeochemistry and Ecology Group, Department of Ecology and Evolutionary Biology, 10515 Research Drive, Building A, Suite 100, University of Tennessee, Knoxville, TN 37932, USA. jgrebmei@utk.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16527980" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arctic Regions ; Ducks ; *Ecosystem ; Fishes ; Geologic Sediments/chemistry ; *Ice Cover ; Oxygen/analysis ; Pacific Ocean ; Population Dynamics ; Temperature ; Walruses ; Whales
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Nonvolcanic Tremor in the Aleutian Arc (2011)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2011-12-01
    Description: Nonvolcanic tremors (NVT) have been observed across the Aleutian arc. The tremorlike events are observed over a large region spanning seismic networks on several volcanoes and are therefore unlikely to be related to any one volcanic complex. Although locating the events is not possible at the present time, we provide general locations based on move-out times and amplitudes across multiple networks. The majority of NVT events are recorded in regions where the subducting Pacific plate is inferred to be locked or transitioning from creeping to locked. One NVT event was recorded during a time of increased seismic and volcanic activity in the area near the Rat and Andreanof Islands. Similar simultaneous increases have been observed in the Aleutians in the past and are hypothesized to be caused by large regional stress changes, possibly caused by slow-slip events. A prominent recent NVT event was recorded on the Korovin and Great Sitkin seismic networks approximately one hour after the onset of the 12 July 2008 eruption of Okmok volcano. NVT does not appear sporadically across the Aleutian arc but seems to concentrate in a few regions. With 2500 km of subduction zone, we have an opportunity to examine these regions and compare them to regions not producing NVT in an attempt to identify factors that may play a role in its creation.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 3
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    Comparison of environmental conditions in the Bering Sea and Davis Strait and the effects on microwave signature returns; March and April, 1979 (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Aircraft data collected in the Bering Sea in March, 1979 using a 6.6 GH sub z (C Band) microwave radiometer and a 13.9 GH sub z (Ku Band) scatterometer, reinforce the difficulties in interpreting first year ice types found near the ice edge in a marginal ice zone. An ice interpretation scheme using data taken with a 13.3 GH sub z (Ku Band) scatterometer and a 19.4 GH sub z (K Band) radiometer in Davis Strait also shows ambiguity in the first year ice signal and indicates that ice interpretation becomes more difficult near the ice edge and under warmer conditions. This report also compares X Band SAR data taken in Davis Strait with similar imagery collected in the Bering Sea. Ice core samples from the Bering test area offer a basis for speculation on changes in ice morphology which affect the signature return at the ice edge, and help explain the difficulty of the sensors in discerning the two different ice types found on the photography and in the core samples.
    Keywords: OCEANOGRAPHY
    Type: NASA-CR-169473 , NAS 1.26:169473
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The Bering Sea ice cover during March 1979: Comparison of surface and satellite data with the Nimbus-7 SMMR (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: During March 1979, field operations were carried out in the Marginal Ice Zone (MIZ) of the Bering Sea. The field measurements which included oceanographic, meteorological and sea ice observations were made nearly coincident with a number of Nimbus-7 and Tiros-N satellite observations. The results of a comparison between surface and aircraft observations, and images from the Tiros-N satellite, with ice concentrations derived from the microwave radiances of the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) are given. Following a brief discussion of the field operations, including a summary of the meteorological conditions during the experiment, the satellite data is described with emphasis on the Nimbus-7 SMMR and the physical basis of the algorithm used to retrieve ice concentrations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-169393 , NAS 1.26:169393 , PB82-230400 , NOAA-82051011
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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