scholarly journals Wind‐Driven Evolution of the North Pacific Subpolar Gyre Over the Last Deglaciation

2020 ◽  
Vol 47 (6) ◽  
Author(s):  
William R. Gray ◽  
Robert C. J. Wills ◽  
James W. B. Rae ◽  
Andrea Burke ◽  
Ruza F. Ivanovic ◽  
...  
Keyword(s):  
North Pacific ◽  
Subpolar Gyre ◽  
Last Deglaciation ◽  
The North ◽  
The Last Deglaciation ◽  
The North Pacific

scholarly journals Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation

2019 ◽  
Author(s):  
William Robert Gray ◽  
Robert C. J. Wills ◽  
James William Buchanan Rae ◽  
Andrea Burke ◽  
Ruza F Ivanovic ◽  
...  
Keyword(s):  
North Pacific ◽  
Subpolar Gyre ◽  
Last Deglaciation ◽  
The North ◽  
The Last Deglaciation ◽  
The North Pacific

scholarly journals Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation

2019 ◽  
Author(s):  
William Gray ◽  
Robert Jnglin Wills ◽  
James Rae ◽  
Andrea Burke ◽  
Ruza Ivanovic ◽  
...  
Keyword(s):  
North Pacific ◽  
Subpolar Gyre ◽  
Last Deglaciation ◽  
The North ◽  
The Last Deglaciation ◽  
The North Pacific

Carbon dioxide release from the North Pacific abyss during the last deglaciation

Nature ◽  
2007 ◽  
Vol 449 (7164) ◽  
pp. 890-893 ◽  
Author(s):  
Eric D. Galbraith ◽  
Samuel L. Jaccard ◽  
Thomas F. Pedersen ◽  
Daniel M. Sigman ◽  
Gerald H. Haug ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
North Pacific ◽  
Last Deglaciation ◽  
The North ◽  
Carbon Dioxide Release ◽  
The Last Deglaciation ◽  
The North Pacific

Atmospheric Control on the Thermohaline Circulation

2009 ◽  
Vol 39 (1) ◽  
pp. 234-247 ◽  
Author(s):  
Arnaud Czaja
Keyword(s):  
Atmospheric Circulation ◽  
North Atlantic ◽  
North Pacific ◽  
Thermohaline Circulation ◽  
High Surface ◽  
Subpolar Gyre ◽  
Atlantic Sector ◽  
The North ◽  
The North Atlantic ◽  
The North Pacific

Abstract In an attempt to elucidate the role of atmospheric and oceanic processes in setting a vigorous ocean overturning circulation in the North Atlantic but not in the North Pacific, a comparison of the observed atmospheric circulation and net surface freshwater fluxes over the North Atlantic and Pacific basins is conducted. It is proposed that the more erratic meridional displacements of the atmospheric jet stream over the North Atlantic sector is instrumental in maintaining high surface salinities in its subpolar gyre. In addition, it is suggested that the spatial pattern of the net freshwater flux at the sea surface favors higher subpolar Atlantic salinity, because the geographical line separating net precipitation from net evaporation is found well south of the time-mean gyre separation in the North Pacific, whereas the two lines tend to coincide in the North Atlantic. Numerical experiments with an idealized two-gyre system confirm that these differences impact the salinity budget of the subpolar gyre. Further analysis of a coupled climate model in which the Atlantic meridional overturning cell has been artificially weakened suggests that the more erratic jet fluctuations in the Atlantic and the shift of the zero [net evaporation minus precipitation (E − P)] line are likely explained by features independent of the state of the thermohaline circulation. It is thus proposed that the atmospheric circulation helps “locking” high surface salinities and an active coupling between upper and deep ocean layers in the North Atlantic rather than in the North Pacific basin.

scholarly journals Laminated sediments in the Bering Sea reveal atmospheric teleconnections to Greenland climate on millennial to decadal timescales during the last deglaciation

2014 ◽  
Vol 10 (3) ◽  
pp. 2467-2518 ◽  
Author(s):  
H. Kuehn ◽  
L. Lembke-Jene ◽  
R. Gersonde ◽  
O. Esper ◽  
F. Lamy ◽  
...  
Keyword(s):  
Bering Sea ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Ice Core ◽  
Laminated Sediments ◽  
Temperature Threshold ◽  
Last Deglaciation ◽  
The North ◽  
Decadal Scale ◽  
The Last Deglaciation

Abstract. During the last glacial termination, the upper North Pacific Ocean underwent dramatic and rapid changes in oxygenation that lead to the transient intensification of Oxygen Minimum Zones (OMZs), recorded by the widespread occurrence of laminated sediments on circum-Pacific continental margins. We present a new laminated sediment record from the mid-depth (1100 m) northern Bering Sea margin that provides insight into these deglacial OMZ maxima with exceptional, decadal-scale detail. Combined ultrahigh-resolution micro-XRF data and sediment facies analysis of laminae reveals an alternation between predominantly terrigenous and diatom-dominated opal sedimentation. The diatomaceous laminae are interpreted to represent spring/summer productivity events that occur at the retreating sea ice margin. We identified five laminated sections in the deglacial part of our site. Laminae counts were carried out on these sections and correlated to the Bølling–Allerød and Preboreal phases in North Greenland Ice Core (NGRIP) oxygen isotope record, indicating an annual deposition of individual laminae couplets. The observed rapid intra-decadal intensifications of anoxia, in particular within the Bølling–Allerød, are tightly coupled to short-term warm events through increases in regional biogenic productivity. By correlating the counted laminated sections with Bering Sea Surface Temperature records (SST) and NGRIP δ18O data, we propose a deglacial minimum SST of 6–7 °C for the preservation of laminae, which we call the deglacial temperature threshold for anoxia occurrence, a process that strongly implies a close atmospheric teleconnection between the North Pacific and North Atlantic regions. We suggest that concomitant increases in Bering Sea biogenic productivity, in combination with oxygen-poor waters entering the Being Sea, drove down oxygen concentrations to values below 0.1 mL L-1 and caused laminae preservation. Calculated benthic-planktic ventilation ages show no significant variations throughout the last deglaciation, indicating that changes in formation rates or differing sources of North Pacific mid-depth waters are not prime candidates for strengthening the OMZ at our site. The age models established by our correlation procedure allow to determine calendar age control points for the Bølling–Allerød and the Preboreal that are independent of the initial radiocarbon-based chronology. Resulting calculated reservoir ages are 875 yr during the Bølling–Allerød, and 910–770 yr for the Younger Dryas and the Preboreal, respectively.

Intra-seasonal and inter-annual patterns in the demographics of sand lance and response to environmental drivers in the North Pacific

2019 ◽  
Vol 617-618 ◽  
pp. 221-244 ◽  
Author(s):  
MR Baker ◽  
ME Matta ◽  
M Beaulieu ◽  
N Paris ◽  
S Huber ◽  
...  
Keyword(s):  
North Pacific ◽  
Environmental Drivers ◽  
Sand Lance ◽  
The North ◽  
The North Pacific ◽  
Annual Patterns
Sign in / Sign up

Export Citation Format

Share Document