linked sea ice–pelagic coupling

during the peak summer discharge, concomitant with a ~5.5-fold increase in chl a (up to 2.4 μg l−1) and a ~2-fold increase in bacterial abundance (up to 22×105 ml−1). Using FC, two subgroups of viruses and heterotrophic bacteria were defined. A low Available online at www.sciencedirect.com Journal of Marine Systems xx (2007) xxx–xxx MARSYS-01526; No of Pages 13 www.elsevier.com/locate/jmarsys ARTICLE IN PRESS⁎SYBR-green fluorescence virus subgroup (V2) representing ~71 % of the total viral abundance, was linked to the abundance of high nucleic acid fluorescence (HNA) bacteria (a proxy for bacterial activity), which represented 42 to 72 % of the bacteria in surface layers. A high SYBR-green fluorescence viral subgroup (V1) was more related to high chl a concentrations that occurred in surface waters during spring and at stations near the Mackenzie River plume during the summer discharge. These results suggest that V1 infect phytoplankton, while most V2 are bacteriophages. On the Beaufort Sea shelf, viral abundance displayed seasonal and spatial variations in conjunction with chl a concentration, bacterial abundance and composition, temperature, salinity and depth. The highly dynamic nature of viral abundance and its correlation with increases in chl a concentration and bacterial abundance implies that viruses are important agents of microbial mortality in Arctic shelf waters.

Foraminiferal assemblage changes over the last 15,000 years on the

[1] Ice thickness and surface roughness measurements of first-year (FY) sea ice were collected with a fix-mounted helicopter-borne electromagnetic (HEM)-laser system in Amundsen Gulf in April to May 2004. The modal ice thickness values are in good qualitative agreement with different ice types

ABSTRACT. The early Thule culture site Co-op, situated at the east end of Amundsen Gulf, along the route to the eastern Arctic, offers excellent conditions for documenting the Thule expansion from Alaska, across the area of western Canadian Thule, and as far as the High Arctic. Whereas the markers

Abstract—Measurements of sea-ice properties were collected using helicopter-borne sensors in Amundsen Gulf, to assess the improved capabilities of ENVISAT dual-polarization advanced synthetic aperture radar (ASAR) data for monitoring sea ice type and sea ice topography. Sea ice thickness

ABSTRACT. In the eastern Beaufort Sea and Amundsen Gulf, research on polar bear populations and their ecological interrelationships with seals and sea ice conditions began in the fall of 1970. Analysis of movement data from mark-recapture studies and tracking of adult female bears with satellite

7 [1] The seasonal and spatial variability of dissolved Barium (Ba) in the Amundsen Gulf, 8 southeastern Beaufort Sea, was monitored over a full year from September 2007 to 9 September 2008. Dissolved Ba displays a nutrient‐type behavior: the maximum water 10 column concentration is located below

offshore, near or beyond the shelf break and in the polar pack ice of the estuary, or in Amundsen Gulf, M’Clure Strait, and Viscount Melville Sound. The movements of tagged belugas into the polar pack and into passages of the Canadian Arctic Archipelago suggest that aerial surveys conducted

is used to estimate daily sea ice area fluxes between the Canadian Arctic Archipelago and the Arctic Ocean and Baffin Bay for the period September 2002 to June 2007. Over the period, Amundsen Gulf and M’Clure Strait exported 54 10 3 km 2 of sea ice area or roughly 77 km 3 of sea ice volume each