Landsat Brightness Temperature of
              Bering Strait


A Synthesis of Year-round Interdisciplinary Mooring Measurements in the Bering Strait
(1990-2014) and the RUSALCA years (2004-2011)

Rebecca A Woodgate1, Kathleen M. Stafford1, and Fredrick G. Prahl2

1Applied Physics Laboratory, University of Washington
2College of Earth, Ocean and Atmospheric Sciences, Oregon State University

Submitted to special RUSALCA issue of Oceanography, February 2015
published September 2015,
Oceanography 28(3):46-67, doi:10.5670/oceanog.2015.57

Abstract
Paper (downloadable)




NOAA logo

NOAA-RUSALCA



NSF logo
NSF-ARC 0632154, 053026,
1107106, 1023264




ONR logo
N00014-13-1-0468



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Please contact Rebecca Woodgate (woodgate@apl.washington.edu) for use of any of this material

Abstract  
    

The flow through the Bering Strait, the only Pacific-Arctic oceanic gateway, has dramatic local, regional, and global impacts. Advanced year-round moored technology quantify challengingly large temporal (sub-daily, seasonal, and interannual) and spatial variability in the ~85km wide, two-channel strait. The typically northward flow, intensified seasonally in the ~10-20km wide, warm, fresh, nutrient-poor Alaskan Coastal Current (ACC) in the east, is otherwise generally homogeneous in velocity throughout the strait, although with higher salinities, nutrients and lower temperatures in the west. Velocity and water properties respond rapidly (including flow reversals) to local wind, likely causing most of the strait's ~two-layer summer structure (by 'spilling' the ACC) and winter water-column homogenization. We identify island-trapped eddy zones in the central strait; changes in sea-ice properties (season-mean thicknesses from <1m to >2m); and increases in annual mean volume, heat, and freshwater fluxes from 2001 to present (2013). Tantalizing first results from year-round bio-optics, nitrate, and ocean acidification sensors indicate significant seasonal and spatial change, possibly driven by the spring bloom. Moored acoustic recorders show large interannual variability in subarctic whale occurrence, related perhaps to water property changes. Substantial daily variability demonstrates the dangers of interpreting section data and the necessity for year-round interdisciplinary time-series measurements.

Polar Science Center, University of Washington, 2015

Figures
  For details, see paper

Figure 1
Map of Bering Strait region

Figure 2
Bering Strait Temperature, Salinity,
                      Fluorescence section

Figure 3
Bering Strait ADCP and geostrophic
                      velocity

Figure 4
Bering Strait Changing Temperature,
                      Salinity and Fluorescence sections

Figure 5
Bering Strait Interannual Fluxes

Figure 6
Bering Strait Whale calls


Polar Science Center, University of Washington, 2015

We gratefully acknowledge financial support for this work from the NOAA RUSALCA program, the National Science Foundation (NSF) and Office of Naval Research (ONR).

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