337 research outputs found
2007), Bistability of the Atlantic subpolar gyre in a coarse‐resolution climate model, Geophys
No full text[1] High resolution models indicate that the dynamics of the Nordic Seas and the subpolar gyre is crucial for deep water formation and overturning circulation in the Atlantic. During the last decades significant changes in ocean properties have been observed in this region. We show that large-scale dynamics, as captured by coarse resolution climate models, allows for a bistability of the Atlantic subpolar gyre. We suggest three positive feedbacks which yield the necessary nonlinearity for this behavior. Transitions between the two states can be triggered by small fluctuations in surface freshwater flux to the Nordic Seas, only slightly larger than natural variability presently observed in the region. Citation: Levermann, A., and A. Bor
Data and code for "The economic commitment of climate change"
No full text<p>This repository contains data and code necessary for replication of the publication:</p>
<p><em>The economic commitment of climate change</em>.<br>M. Kotz, A. Levermann, L. Wenz. Nature. 2024.</p>
<p>See the README document for detailed instructions in its use.</p>
<p>Please feel free to contact [email protected] in case of any questions.</p>
Data and code for "The economic commitment of climate change"
No full text<p>This repository contains data and code necessary for replication of the publication:</p>
<p><em>The economic commitment of climate change</em>.<br>M. Kotz, A. Levermann, L. Wenz. Nature. 2024.</p>
<p>See the README document for detailed instructions in its use.</p>
<p>Please feel free to contact [email protected] in case of any questions.</p>
Report of the Eighth Session of the Working Group on Ocean Model Development, 30th April - 1st May 2009, Exeter, United Kingdom
No full textPotential climatic transitions with profound impact on Europe
No full textWe discuss potential transitions of six climatic subsystems with large-scale impact on Europe, sometimes denoted as tipping elements. These are the ice sheets on Greenland and West Antarctica, the Atlantic thermohaline circulation, Arctic sea ice, Alpine glaciers and northern hemisphere stratospheric ozone. Each system is represented by co-authors actively publishing in the corresponding field. For each subsystem we summarize the mechanism of a potential transition in a warmer climate along with its impact on Europe and assess the likelihood for such a transition based on published scientific literature. As a summary, the ‘tipping’ potential for each system is provided as a function of global mean temperature increase which required some subjective interpretation of scientific facts by the authors and should be considered as a snapshot of our current understanding. <br/
Sea-Level Rise by 2100
No full textISI Document Delivery No.: 274ZI Times Cited: 0 Cited Reference Count: 0 Church, John A. Clark, Peter U. Cazenave, Anny Gregory, Jonathan M. Jevrejeva, Svetlana Levermann, Anders Merrifield, Mark A. Milne, Glenn A. Nerem, R. Steven Nunn, Patrick D. Payne, Antony J. Pfeffer, W. Tad Stammer, Detlef Unnikrishnan, Alakkat S. payne, antony/A-8916-2008; Church, John/A-1541-2012 payne, antony/0000-0001-8825-8425; Church, John/0000-0002-7037-8194 0 AMER ASSOC ADVANCEMENT SCIENCE WASHINGTON SCIENC
Sea-Level Rise by 2100
No full textISI Document Delivery No.: 274ZI Times Cited: 0 Cited Reference Count: 0 Church, John A. Clark, Peter U. Cazenave, Anny Gregory, Jonathan M. Jevrejeva, Svetlana Levermann, Anders Merrifield, Mark A. Milne, Glenn A. Nerem, R. Steven Nunn, Patrick D. Payne, Antony J. Pfeffer, W. Tad Stammer, Detlef Unnikrishnan, Alakkat S. payne, antony/A-8916-2008; Church, John/A-1541-2012 payne, antony/0000-0001-8825-8425; Church, John/0000-0002-7037-8194 0 AMER ASSOC ADVANCEMENT SCIENCE WASHINGTON SCIENC
Sea-Level Rise by 2100
No full textISI Document Delivery No.: 274ZI Times Cited: 0 Cited Reference Count: 0 Church, John A. Clark, Peter U. Cazenave, Anny Gregory, Jonathan M. Jevrejeva, Svetlana Levermann, Anders Merrifield, Mark A. Milne, Glenn A. Nerem, R. Steven Nunn, Patrick D. Payne, Antony J. Pfeffer, W. Tad Stammer, Detlef Unnikrishnan, Alakkat S. payne, antony/A-8916-2008; Church, John/A-1541-2012 payne, antony/0000-0001-8825-8425; Church, John/0000-0002-7037-8194 0 AMER ASSOC ADVANCEMENT SCIENCE WASHINGTON SCIENC
Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models?
No full textThe Atlantic subpolar gyre (SPG) is one of the main drivers of decadal climate variability in the North Atlantic. Here we analyze its dynamics in pre-industrial control simulations of 19 different comprehensive coupled climate models. The analysis is based on a recently proposed description of the SPG dynamics that found the circulation to be potentially bistable due to a positive feedback mechanism including salt transport and enhanced deep convection in the SPG center. We employ a statistical method to identify multiple equilibria in time series that are subject to strong noise and analyze composite fields to assess whether the bistability results from the hypothesized feedback mechanism. Because noise dominates the time series in most models, multiple circulation modes can unambiguously be detected in only six models. Four of these six models confirm that the intensification is caused by the positive feedback mechanism
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