Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
2015, Geophysical Research Letters
Journal of Geophysical Research: Oceans
Vertical fluxes of nitrate in the seasonal nitracline of the Atlantic sector of the Arctic OceanScience (New York, N.Y.)
Greater role for Atlantic inflows on sea-ice loss in the Eurasian Basin of the Arctic Ocean2017 •
Arctic sea-ice loss is a leading indicator of climate change and can be attributed, in large part, to atmospheric forcing. Here, we show that recent ice reductions, weakening of the halocline, and shoaling of intermediate-depth Atlantic Water layer in the eastern Eurasian Basin have increased winter ventilation in the ocean interior, making this region structurally similar to that of the western Eurasian Basin. The associated enhanced release of oceanic heat has reduced winter sea-ice formation at a rate now comparable to losses from atmospheric thermodynamic forcing, thus explaining the recent reduction in sea-ice cover in the eastern Eurasian Basin. This encroaching "atlantification" of the Eurasian Basin represents an essential step toward a new Arctic climate state, with a substantially greater role for Atlantic inflows.
Scientific Reports
The influence of Arctic Fe and Atlantic fixed N on summertime primary production in Fram Strait, North Greenland SeaClimate change has led to a ~ 40% reduction in summer Arctic sea-ice cover extent since the 1970s. Resultant increases in light availability may enhance phytoplankton production. Direct evidence for factors currently constraining summertime phytoplankton growth in the Arctic region is however lacking. GEOTRACES cruise GN05 conducted a Fram Strait transect from Svalbard to the NE Greenland Shelf in summer 2016, sampling for bioessential trace metals (Fe, Co, Zn, Mn) and macronutrients (N, Si, P) at ~ 79°N. Five bioassay experiments were conducted to establish phytoplankton responses to additions of Fe, N, Fe + N and volcanic dust. Ambient nutrient concentrations suggested N and Fe were deficient in surface seawater relative to typical phytoplankton requirements. A west-to-east trend in the relative deficiency of N and Fe was apparent, with N becoming more deficient towards Greenland and Fe more deficient towards Svalbard. This aligned with phytoplankton responses in bioassay experime...
Frontiers in Marine Science
Asynchronous Accumulation of Organic Carbon and Nitrogen in the Atlantic Gateway to the Arctic Ocean2011 •
Nature Climate Change
Phytoplankton dynamics in a changing Arctic Ocean2020 •
Changes in the Arctic atmosphere, cryosphere and Ocean are drastically altering the dynamics of phytoplankton, the base of marine ecosystems. This Review addresses four major complementary questions of ongoing Arctic Ocean changes and associated impacts on phytoplankton productivity, phenology and assemblage composition. We highlight trends in primary production over the last two decades while considering how multiple environmental drivers shape Arctic biogeography. Further, we consider changes to Arctic phenology by borealization and hidden under-ice blooms, and how the diversity of phytoplankton assemblages might evolve in a novel Arctic ‘biogeochemical landscape’. It is critical to understand these aspects of changing Arctic phytoplankton dynamics as they exert pressure on marine Arctic ecosystems in addition to direct effects from rapid environmental changes.
Deep Sea Research Part I: Oceanographic Research Papers
Particle sources and downward fluxes in the eastern Fram strait under the influence of the west Spitsbergen current2015 •
Journal of Geophysical Research
Observations of turbulent mixing and hydrography in the marginal ice zone of the Barents Sea2007 •
Phytoplankton blooms in the Barents Sea are highly sensitive to seasonal and interannual changes in sea ice extent, water mass distribution, and oceanic fronts. With the ongoing increase of Atlantic Water inflows, we expect an impact on these blooms. Here, we use a state-of-the-art collection of in situ hydrogeochemical data for the period 1998–2014, which includes ocean color satellite-derived proxies for the biomass of calcifying and noncalcifying phytoplankton. Over the last 17 years, sea ice extent anomalies were evidenced having direct consequences for the spatial extent of spring blooms in the Barents Sea. In years of minimal sea ice extent, two spatially distinct blooms were clearly observed: one along the ice edge and another in ice-free water. These blooms are thought to be triggered by different stratification mechanisms: heating of the surface layers in ice-free waters and melting of the sea ice along the ice edge. In years of maximal sea ice extent, no such spatial delimitation was observed. The spring bloom generally ended in June when nutrients in the surface layer were depleted. This was followed by a stratified and oligotrophic summer period. A coccolithophore bloom generally developed in August, but was confined only to Atlantic Waters. In these same waters, a late summer bloom of noncalcifying algae was observed in September, triggered by enhanced mixing, which replenishes surface waters with nutrients. Altogether, the 17 year time-series revealed a northward and eastward shift of the spring and summer phytoplankton blooms.
Journal of Geophysical Research: Oceans
Dependence of subsurface chlorophyll on seasonal water masses in the Chukchi Sea2016 •
Deep Sea Research Part I: Oceanographic Research Papers
Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basinsJournal of Marine Systems
The Barents and Chukchi Seas: Comparison of two Arctic shelf ecosystems2013 •
Frontiers in Marine Science
Episodic Arctic CO2 Limitation in the West Svalbard ShelfJournal of Physical Oceanography
Internal Waves and Mixing in the Marginal Ice Zone near the Yermak Plateau*2010 •
Journal of Geophysical Research
Nares Strait hydrography and salinity field from a 3-year moored array2010 •
2011 •
Journal of Geophysical Research: Oceans
The Atlantic Water Boundary Current in the Chukchi Borderland and Southern Canada Basin2020 •
2010 •
Progress in Oceanography
Biogenic carbon flows through the planktonic food web of the Amundsen Gulf (Arctic Ocean): A synthesis of field measurements and inverse modeling analysesJournal of Marine Systems
The influence of advection on zooplankton community composition in an Arctic fjord (Kongsfjorden, Svalbard)2006 •
Deep Sea Research Part I: Oceanographic Research Papers
Dynamics of upwelling in the Alaskan Beaufort Sea and associated shelf–basin fluxes2013 •
2006 •
Journal of Geophysical Research: Oceans
Revisiting internal waves and mixing in the Arctic Ocean2013 •
Scientific reports
Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ice2017 •
Deep Sea Research Part II: Topical Studies in Oceanography
Mesoscale frontal dynamics: shaping the environment of primary production in the Antarctic Circumpolar Current2002 •
Arctic–Subarctic Ocean Fluxes
Fresh-Water Fluxes via Pacific and Arctic Outflows Across the Canadian Polar Shelf2008 •
Journal of Physical Oceanography
Early Spring Oceanic Heat Fluxes and Mixing Observed from Drift Stations North of Svalbard*2009 •
Progress in Oceanography
Physical and biological characteristics of the pelagic system across Fram Strait to Kongsfjorden2006 •
Polar Biology
Spring bloom dynamics in Kongsfjorden, Svalbard: nutrients, phytoplankton, protozoans and primary production2012 •
2008 •
Journal of Marine Systems
234Th-derived particulate organic carbon fluxes in the northern Barents Sea with comparison to drifting sediment trap fluxes2008 •
Journal of Geophysical Research
Processes influencing seasonal hypoxia in the northern California Current System2010 •
Ocean Science
Heat loss from the Atlantic water layer in the northern Kara Sea: causes and consequences2014 •
Ocean Modelling
An assessment of the added value from data assimilation on modelled Nordic Seas hydrography and ocean transports2016 •
Journal of Plankton Research
Arctic complexity: a case study on diel vertical migration of zooplankton2014 •