World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

On the Glacial and Inter-glacial Thermohaline Circulation and the Associated Transports of Heat and Freshwater : Volume 11, Issue 2 (20/03/2014)

By Ballarotta, M.

Click here to view

Book Id: WPLBN0004020848
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: On the Glacial and Inter-glacial Thermohaline Circulation and the Associated Transports of Heat and Freshwater : Volume 11, Issue 2 (20/03/2014)  
Author: Ballarotta, M.
Volume: Vol. 11, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Brodeau, L., Döös, K., Falahat, S., & Ballarotta, M. (2014). On the Glacial and Inter-glacial Thermohaline Circulation and the Associated Transports of Heat and Freshwater : Volume 11, Issue 2 (20/03/2014). Retrieved from http://worldlibrary.net/


Description
Description: Department of Physical Geography and Quaternary Geology, Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, Sweden. The change of the thermohaline circulation (THC) between the Last Glacial Maximum (LGM, ≈ 21 kyr ago) and the present day climate are explored using an Ocean General Circulation Model and stream functions projected in various coordinates. Compared to the present day period, the LGM circulation is reorganised in the Atlantic Ocean, in the Southern Ocean and particularly in the abyssal ocean, mainly due to the different haline stratification. Due to stronger wind stress, the LGM tropical circulation is more vigorous than under modern conditions. Consequently, the maximum tropical transport of heat is slightly larger during the LGM. In the North Atlantic basin, the large sea-ice extent during the LGM constrains the Gulf Stream to propagate in a more zonal direction, reducing the transport of heat towards high latitudes and reorganising the freshwater transport. The LGM circulation is represented as a large intrusion of saline Antarctic Bottom Water into the Northern Hemisphere basins. As a result, the North Atlantic Deep Water is shallower in the LGM simulation. The stream functions in latitude-salinity coordinates and thermohaline coordinates point out the different haline regimes between the glacial and interglacial period, as well as a LGM Conveyor Belt circulation largely driven by enhanced salinity contrast between the Atlantic and the Pacific basin. The thermohaline structure in the LGM simulation is the result of an abyssal circulation that lifts and deviates the Conveyor Belt cell from the area of maximum volumetric distribution, resulting in a ventilated upper layer above a deep stagnant layer, and an Atlantic circulation more isolated from the Pacific. An estimation of the turnover times reveal a deep circulation almost sluggish during the LGM, and a Conveyor Belt cell more vigorous due to the combination of stronger wind stress and shortened circulation route.

Summary
On the glacial and inter-glacial thermohaline circulation and the associated transports of heat and freshwater

Excerpt
Adkins, J. F. and Schrag, D. P.: Pore fluid constraints on deep ocean temperature and salinity during the Last Glacial Maximum, Geophys. Res. Lett., 28, 771–774, doi:10.1029/2000GL011597, 2001.; Adkins, J. F., Mcintyre, K., and Schrag, D. P.: The Salinity, Temperature, and δ18O of the Glacial Deep Ocean, Science, 298, 1769–1773, doi:10.1126/science.1076252, 2002.; Ballarotta, M., Brodeau, L., Brandefelt, J., Lundberg, P., and Döös, K.: Last Glacial Maximum world ocean simulations at eddy-permitting and coarse resolutions: do eddies contribute to a better consistency between models and palaeoproxies?, Clim. Past, 9, 2669–2686, doi:10.5194/cp-9-2669-2013, 2013.; Barnier, B., Madec, G., Penduff, T., Molines, J. M., Tréguier, A. M. Le Sommer, J., Beckmann, A., Biastoch, A. Böning, C., Dengg, J., Derval, C., Durand, E., Gulev, S., Remy, E., Talandier, C., Theetten, S., Maltrud, M., McClean, J., and De Cuevas, B.: Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution, Ocean Dynam., 56, 543–567, doi:10.1007/s10236-006-0082-1, 2006.; Drijfhout, S. S.: What sets the surface eddy mass flux in the Southern Ocean?, J. Phys. Oceanogr., 35, 2152–2166, 2005; Barnier, B., Brodeau, L., LeSommer, J., Molines, J.-M., Penduff, T., Theetten, S., Tréguier, A.-M., Madec, G., Biastoch, A., Böning, C., Dengg, J., Gulev, S., Bourdallé, B. R., Chanut, J., Garric, G., Coward, A., de Cuevas, B., New, A., Haines, K., Smith, G. C., Drijfhout, S., Hazeleger, W., Severijns, C., and Myers, P.: Eddy-permitting ocean circulation hindcasts of past decades, CLIVAR Exchanges, 12, 8–10, 2007.; Bryan, F. O., Danabasoglu, G., Nakashiki, N., Yoshida, Y., Kim, D. H., Tsutsui, J., and Doney, S. C.: Response of the North Atlantic thermohaline circulation and ventilation to increasing carbon dioxide in CCSM3, J., Climate, 19, 2382–2397, doi:10.1175/JCLI3757.1, 2006; Brandefelt, J. and Otto-Bliesner, B. L.: Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3, Geophys. Res. Lett., 36, 1–5, doi:10.1029/2009GL040364, 2009.; Brodeau, L., Barnier, B., Tréguier, A. M., Penduff, T., and Gulev, S.: An ERA40-based atmospheric forcing for global ocean circulation models, Ocean Model., 31, 88–104, doi:10.1016/j.ocemod.2009.10.005, 2010.; Broecker, W. S.: The great ocean conveyor, Oceanography, 4, 79–89, 1991.; Butzin, M., Prange, M., and Lohmann, G.: Radiocarbon simulations for the glacial ocean: the effects of wind stress, Southern Ocean sea ice and Heinrich events, Earth Planet. Sc. Lett., 235, 45–61, doi:10.1016/j.epsl.2005.03.003, 2005.; Curry, W. B.: Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean, Paleoceanography, 20, 1–13, doi:10.1029/2004PA001021, 2005.; Döös, K. and Webb, D.: The Deacon Cell and the other meridional cells of the Southern Ocean, J. Phys. Oceanogr., 24, 429–442, 1994.; Döös, K., Nilsson, J., Nycander, J., Brodeau, L., and Ballarotta, M.: The World Ocean Thermohaline Circulation, J. Phys. Oceanogr., 42, 1445–1460, doi:10.1175/JPO-D-11-0163.1, 2012.; Dufresne, J.-L., Foujols, M.-A., Denvil, S., Caubel, A., Marti, O., Aumont, O., Balkanski, Y., Bekki, S., Bellenger, H., Benshila, R., Bony, S., Bopp, L., Bra

 

Click To View

Additional Books


  • Detecting Changes in Labrador Sea Water ... (by )
  • Tidally-induced Lateral Dispersion of th... (by )
  • Wave-turbulence Scaling in the Ocean Mix... (by )
  • A Statistical Model for Sea Surface Diur... (by )
  • High Frequency Variability of the Atlant... (by )
  • A 20-year Reanalysis Experiment in the B... (by )
  • Optical Tools for Ocean Monitoring and R... (by )
  • Climatological Mean Distribution of Spec... (by )
  • Enso-correlated Fluctuations in Ocean Bo... (by )
  • Accelerated Sea Level Rise and Florida C... (by )
  • Consistency of the Current Global Ocean ... (by )
  • The Contribution of Eastern-boundary Den... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.