] The Beaufort Gyre (BG) of the Arctic Ocean is one ofthe most hostile and inaccessible areas of the globe. Untillate 1920s most of it had never been measured or evenexplored. The region’s harsh climate, winter darkness, andthick drifting sea ice deterred potential observers and madethis area inaccessible to scientific expeditions. The BG isa unique phenomenon comprising a set of specific atmo-spheric, sea ice, and oceanic conditions that have significantinfluence on the Arctic climate. The papers of this specialissue focus on the atmospheric, sea ice, oceanographic, andsome biogeochemical features of this region and describethe BG system variability at seasonal to decadal timescales,employing historical and the most recent data, simplehypotheses, and models to estimate changes.

/pdf/preface-to-special-section-on-beaufort-gyre-climate-system-8kfoqpyc8a.pdf

Preface to special section on Beaufort Gyre Climate System Exploration Studies : documenting key parameters to understand environmental variability

The Beaufort Gyre (BG) was spun up in the last decade which is an important factor in regulating the variation of the upper ocean. The heat content and freshwater content of the upper ocean increased gradually in the Canada Basin, as did momentum input. Both the geostrophic wind curl and freshwater content could contribute to the spin-up of BG. However, even though there is no change of the wind field the increasing freshwater alone could result in the spin-up of BG. In this study we show that the Pacific Water is difficult to flow into the central basin as the BG spins up and the maximum temperature of the Pacific Summer Water (PSW) experienced a dramatic decrease inside the BG in 2005 and 2009 due to a change of flow pathway of PSW. The enhancement of Ekman Pumping (EP) contributed to the deepening of the Pacific Winter Water by piling up more freshwater. This change of water column dynamics has also contributed to the deepening ofthe Atlantic Water core after 2007. The EP decreased significantly in 2012 (indicating a spin down of BG) and the direction of Ekman transport turned to the north, which favoured the release of freshwater that had resided in the basin for years.

The Beaufort Gyre variation and its impacts on the Canada Basin in 2003–2012

Joint Effects of Boundary Currents, Thermohaline Intrusions and Gyre Circulation on the Recent Warming of Atlantic Water in the Canada Basin: 1993-2007

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Joint Effects of Boundary Currents, Thermohaline Intrusions and Gyre Circulation on the Recent Warming of Atlantic Water in the Canada Basin: 1993-2007