Docstoc

Sudden Changes in the Thermohaline Circulation

Document Sample
Sudden Changes in the Thermohaline Circulation Powered By Docstoc
					   Sudden Changes in the Thermohaline Circulation
                        DATA                                                                                                 2D - OCEAN MODEL

       MODERN OCEAN                                      0                                                  0
                                                                                                                                                  16
                                                                                                                                               14 16
                                                                                                                                           12 14




                                                               Water depth (km)
                                                                                                                                            12
                                                                                                                              10
                                                                                                                           88 10
                                                                                                                          6
                                                                                                                        4 6
                                                                                                                              4
                                                                                                                        2
                                                         2.5                                                2.5              2
                                                1.1                                                                      0
                                                                                                                                       0
                              0.7                                                                                       -2
                                                                                                                             -2


                                                         5.0                                                5.0


                                                         0                                                  0                                                    0
           GLACIAL OCEAN                                                                                                                       10
                                                                                                                                           88 10
                                                                                                                                       6
                                                                                                                                       6
                                                                                                                                  44
                                                                  Water depth(km)



                                                                                                                              2
                                                                                                                              2

                                                                                                                             0 0
                                          0.7
                                                         2.5                                       2.5                       -2
                                                                                                                                  -2
                        0.3



                                                         5.0                                         5.0
       S    40°   20°         0°    20°     40°       60° N                                                     S       30°            0°       30°       60°        90°    N




                                                                                                                1.5
                                                                                                                                                           Modern
                                                                                                                                                           Glacial
                                                                                    Heat transport (10 W)




                                                                                                                1.0


                                                                                                                0.5
                                                                                                 15




                                                                                                                    0


                                                                                                                -0.5
                                                                                                                    S     30°              0°       30°    60°        90° N


Left: reconstruction of the d13 C changes across the Atlantic ocean for the modern
period (upper panel) and the Last Glacial Maximum (LGM, lower panel); adapted
from Duplessy et al., 1988, Palaeoceanography, 3, 343-360.
Right: contour of the mean annual meridional overturning stream-function in the
Atlantic basin for the modern conditions (upper panel) and the LGM (intermediate
panel) calculated by the 2-D Louvain - La - Neuve ocean model (Fichefet et al.,
1994, Nature, 372, 252-255). The lower panel shows the mean annual meridional
heat transport computed for the present and LGM boundary conditions.
                                                                                                                                                                           AV/D3/99-3

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:8
posted:3/7/2010
language:English
pages:1
Description: Sudden Changes in the Thermohaline Circulation