Sensitivity of the North Atlantic Ocean Circulation to an abrupt change in the Nordic Sea overflow in a high resolution global coupled climate model

2011 ◽  
Vol 116 (C12) ◽  
Author(s):  
Rong Zhang ◽  
Thomas L. Delworth ◽  
Anthony Rosati ◽  
Whit G. Anderson ◽  
Keith W. Dixon ◽  
...  
Keyword(s):  
High Resolution ◽  
Atlantic Ocean ◽  
Ocean Circulation ◽  
North Atlantic ◽  
Abrupt Change ◽  
Climate Model ◽  
North Atlantic Ocean ◽  
Coupled Climate Model ◽  
The North ◽  
The North Atlantic

scholarly journals The Relative Influence of Atmospheric and Oceanic Model Resolution on the Circulation of the North Atlantic Ocean in a Coupled Climate Model

2018 ◽  
Vol 10 (8) ◽  
pp. 2026-2041 ◽  
Author(s):  
Dmitry V. Sein ◽  
Nikolay V. Koldunov ◽  
Sergey Danilov ◽  
Dmitry Sidorenko ◽  
Claudia Wekerle ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
Climate Model ◽  
North Atlantic Ocean ◽  
Relative Influence ◽  
Model Resolution ◽  
Coupled Climate Model ◽  
The North ◽  
The North Atlantic ◽  
Oceanic Model

scholarly journals A Mechanism of Internal Decadal Atlantic Ocean Variability in a High-Resolution Coupled Climate Model

2015 ◽  
Vol 28 (19) ◽  
pp. 7764-7785 ◽  
Author(s):  
Matthew B. Menary ◽  
Daniel L. R. Hodson ◽  
Jon I. Robson ◽  
Rowan T. Sutton ◽  
Richard A. Wood
Keyword(s):  
High Resolution ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
Climate Models ◽  
Climate Model ◽  
Heat Content ◽  
Coupled Climate Model ◽  
North Atlantic Current ◽  
The North ◽  
The North Atlantic

Abstract The North Atlantic Ocean subpolar gyre (NA SPG) is an important region for initializing decadal climate forecasts. Climate model simulations and paleoclimate reconstructions have indicated that this region could also exhibit large, internally generated variability on decadal time scales. Understanding these modes of variability, their consistency across models, and the conditions in which they exist is clearly important for improving the skill of decadal predictions—particularly when these predictions are made with the same underlying climate models. This study describes and analyzes a mode of internal variability in the NA SPG in a state-of-the-art, high-resolution, coupled climate model. This mode has a period of 17 yr and explains 15%–30% of the annual variance in related ocean indices. It arises because of the advection of heat content anomalies around the NA SPG. Anomalous circulation drives the variability in the southern half of the NA SPG, while mean circulation and anomalous temperatures are important in the northern half. A negative feedback between Labrador Sea temperatures/densities and those in the North Atlantic Current (NAC) is identified, which allows for the phase reversal. The atmosphere is found to act as a positive feedback on this mode via the North Atlantic Oscillation (NAO), which itself exhibits a spectral peak at 17 yr. Decadal ocean density changes associated with this mode are driven by variations in temperature rather than salinity—a point which models often disagree on and which may affect the veracity of the underlying assumptions of anomaly-assimilating decadal prediction methodologies.

Surface temperatures of the Mid-Pliocene North Atlantic Ocean: implications for future climate

2008 ◽  
Vol 367 (1886) ◽  
pp. 69-84 ◽  
Author(s):  
Harry J Dowsett ◽  
Mark A Chandler ◽  
Marci M Robinson
Keyword(s):  
Climate Change ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
Climate Model ◽  
North Atlantic Ocean ◽  
Future Climate ◽  
First Century ◽  
Sea Surface ◽  
The North ◽  
The North Atlantic

The Mid-Pliocene is the most recent interval in the Earth's history to have experienced warming of the magnitude predicted for the second half of the twenty-first century and is, therefore, a possible analogue for future climate conditions. With continents basically in their current positions and atmospheric CO 2 similar to early twenty-first century values, the cause of Mid-Pliocene warmth remains elusive. Understanding the behaviour of the North Atlantic Ocean during the Mid-Pliocene is integral to evaluating future climate scenarios owing to its role in deep water formation and its sensitivity to climate change. Under the framework of the Pliocene Research, Interpretation and Synoptic Mapping (PRISM) sea surface reconstruction, we synthesize Mid-Pliocene North Atlantic studies by PRISM members and others, describing each region of the North Atlantic in terms of palaeoceanography. We then relate Mid-Pliocene sea surface conditions to expectations of future warming. The results of the data and climate model comparisons suggest that the North Atlantic is more sensitive to climate change than is suggested by climate model simulations, raising the concern that estimates of future climate change are conservative.

Changes in the Bathymetry and Volume of Glacial Lake Agassiz Between 11,000 and 9300 14C yr B.P.

2000 ◽  
Vol 54 (2) ◽  
pp. 174-181 ◽  
Author(s):  
David W. Leverington ◽  
Jason D. Mann ◽  
James T. Teller
Keyword(s):  
Atlantic Ocean ◽  
Great Lakes ◽  
Ocean Circulation ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Glacial Lake ◽  
Lake Agassiz ◽  
The North ◽  
Glacial Lake Agassiz ◽  
The North Atlantic

The volume and surface area of glacial Lake Agassiz varied considerably during its 4000-year history. Computer models for seven stages of Lake Agassiz were used to quantify these variations over the lake's early history, between about 11,000 and 9300 14C yr B.P. (ca. 13,000 to 10,300 cal yr B.P.). Just after formation of the Herman strandlines (ca. 11,000 14C yr B.P.), the volume of Lake Agassiz appears to have decreased by >85% as a consequence of the abrupt rerouting of overflow to its eastern outlet from its southward routing into the Mississippi River basin. This drainage released about 9500 km3 of water into the North Atlantic Ocean via the Great Lakes and Gulf of St. Lawrence. Following closure of this eastern routing of overflow, the lake reached its maximum size at about 9400 14C yr B.P. with an area of >260,000 km2 and a volume of >22,700 km3. A second major reduction in volume occurred shortly after that, when its volume decreased >10% following the opening of the Kaiashk outlet to the east into the Great Lakes, and 2500–7000 km3 of water was released into the North Atlantic Ocean. These discharges may have affected ocean circulation and North Atlantic Deep Water production.

Higher Laurentide and Greenland ice sheets strengthen the North Atlantic ocean circulation

2015 ◽  
Vol 45 (1-2) ◽  
pp. 139-150 ◽  
Author(s):  
Xun Gong ◽  
Xiangdong Zhang ◽  
Gerrit Lohmann ◽  
Wei Wei ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Ocean Circulation ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Ice Sheets ◽  
The North ◽  
The North Atlantic

scholarly journals Simulation of CFCs in the North Atlantic Ocean using an adiabatically corrected ocean circulation model

2006 ◽  
Vol 111 (C6) ◽  
Author(s):  
Jun Zhao ◽  
Jinyu Sheng ◽  
Richard J. Greatbatch ◽  
Kumiko Azetsu-Scott ◽  
E. Peter Jones
Keyword(s):  
Atlantic Ocean ◽  
Ocean Circulation ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Circulation Model ◽  
Ocean Circulation Model ◽  
The North ◽  
The North Atlantic
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