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Author
Ilicak, M. ; Drange, H. ; Wang, Q. ; Gerdes, R. ; Aksenov, Y. ; Bailey, D. ; Bentsen, M. ; Biastoch, A. ; Bozec, A. ; Böning, C. ; Cassou, C. ; Chassignet, E. ; Coward, A.C. ; Curry, B. ; Danabasoglu, G. ; Danilov, S. ; Fernandez, E. ; Fogli, P.G. ; Fujii, Y. ; Griffies, S.M. ; Iovino, D. ; Jahn, A. ; Jung, T. ; Large, W.G. ; Lee, C. ; Lique, C. ; Lu, J. ; Masina, S. ; George Nurser, A.J. ; Roth, C. ; Salas y Mélia, D. ; Samuels, B.L. ; Spence, P. ; Tsujino, H. ; Valcke, S. ; Voldoire, A. ; Wang, X. ; Yeager, S.G.
Title
An assessment of the Arctic Ocean in a suite of interannual CORE-II simulations. Part III: Hydrography and fluxes
Type
$loc['typeJournal Article']
Year
2016
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
100
Issue
Pages
141-161
Keywords
Arctic Ocean ; Atlantic Water ; St. Anna Trough ; Density currents ; CORE-II atmospheric forcing
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Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
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Expedition
Conference
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
80
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Author
Jackson, L.C. ; Dubois, C. ; Forget, G. ; Haines, K. ; Harrison, M. ; Iovino, D. ; Köhl, A. ; Mignac, D. ; Masina, S. ; Peterson, K.A. ; Piecuch, C.G. ; Roberts, C.D. ; Robson, J. ; Storto, A. ; Toyoda, T. ; Valdivieso, M. ; Wilson, C. ; Wang, Y. ; Zuo, H.
Title
The Mean State and Variability of the North Atlantic Circulation: A Perspective From Ocean Reanalyses
Type
$loc['typeJournal Article']
Year
2019
Publication
Journal of Geophysical Research: Oceans
Abbreviated Journal
J. Geophys. Res. Oceans
Volume
124
Issue
12
Pages
8969-9003
Keywords
Abstract
The transfer of Indian Ocean thermocline and intermediate waters into the South Atlantic via the Agulhas leakage is generally believed to be primarily accomplished through mesoscale eddy processes, essentially anticyclones known as Agulhas Rings. Here we take advantage of a recent eddy tracking algorithm and Argo float profiles to study the evolution and the thermohaline structure of one of these eddies over the course of 1.5 years (May 2013–November 2014). We found that during this period the ring evolved according to two different phases: During the first one, taking place in winter, the mixing layer in the eddy deepened significantly. During the second phase, the eddy subsided below the upper warmer layer of the South Atlantic subtropical gyre while propagating west. The separation of this eddy from the sea surface could explain the decrease in its surface signature in satellite altimetry maps, suggesting that such changes are not due to eddy dissipation processes. It is a very large eddy (7.1×1013 m3 in volume), extending, after subduction, from a depth of 200–1,200 m and characterized by two mode water cores. The two mode water cores represent the largest eddy heat and salt anomalies when compared with the surrounding. In terms of its impact over 1 year, the north‐westward propagation of this long‐lived anticyclone induces a transport of 2.2 Sv of water, 0.008 PW of heat, and 2.2×105 kg s−1 of salt. These results confirm that Agulhas Rings play a very important role in the Indo‐Atlantic interocean exchange of heat and salt.
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Edition
ISSN
2169-9275
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Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1080
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Author
Roberts, M.J. ; Jackson, L.C. ; Roberts, C.D. ; Meccia, V. ; Docquier, D. ; Koenigk, T. ; Ortega, P. ; Moreno‐ ; Chamarro, E. ; Bellucci, A. ; Coward, A. ; Drijfhout, S. ; Exarchou, E. ; Gutjahr, O. ; Hewitt, H. ; Iovino, D. ; Lohmann, K. ; Putrasahan, D. ; Schiemann, R. ; Seddon, J. ; Terray, L. ; Xu, X. ; Zhang, Q. ; Chang, P. ; Yeager, S.G. ; Castruccio, F.S. ; Zhang. C. ; Wu, L.
Title
Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes
Type
$loc['typeJournal Article']
Year
2020
Publication
Journal of Advances in Modeling Earth Systems
Abbreviated Journal
J. Adv. Model. Earth Syst.
Volume
Issue
Pages
Accepted
Keywords
Abstract
A multi‐model, multi‐resolution ensemble using CMIP6 HighResMIP coupled experiments is used to assess the performance of key aspects of the North Atlantic circulation. The Atlantic Meridional Overturning Circulation (AMOC), and related heat transport, tends to become stronger as ocean model resolution is enhanced, better agreeing with observations at 26.5°N. However for most models the circulation remains too shallow compared to observations, and has a smaller temperature contrast between the northward and southward limbs of the AMOC. These biases cause the northward heat transport to be systematically too low for a given overturning strength. The higher resolution models also tend to have too much deep mixing in the subpolar gyre. In the period 2015‐2050 the overturning circulation tends to decline more rapidly in the higher resolution models, which is related to both the mean state and to the subpolar gyre contribution to deep water formation. The main part of the decline comes from the Florida Current component of the circulation. Such large declines in AMOC are not seen in the models with resolutions more typically used for climate studies, suggesting an enhanced risk for Northern Hemisphere climate change. However, only a small number of different ocean models are included in the study.
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Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1109
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