Abstract
Most global climate models simulate a weakening of the North Atlantic thermohaline circulation (THC) in response to enhanced greenhouse warming. Both surface warming and freshening in high latitudes, the so-called sinking region, contribute to the weakening of the THC. Some models simulate even a complete breakdown of the THC at sufficiently strong forcing. Here results from a state-of-the-art global climate model are presented that does not simulate a weakening of the THC in response to greenhouse warming. Large-scale air-sea interactions in the tropics, similar to those operating during present-day El Niños, lead to anomalously high salinities in the tropical Atlantic. These are advected into the sinking region, thereby increasing the surface density and compensating the effects of the local warming and freshening. The results of the model study are corroborated by the analysis of observations.
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References
Bacher A, Oberhuber JM, Roeckner E (1997) ENSO dynamics and seasonal cycle in the tropical Pacific as simulated by the ECHAM4/OPYC3 coupled general circulation model. Climate Dyn 14:431–450
Broecker WS (1991) The great ocean conveyor. Oceanography 4: 79–89
Broecker WS, Peteet DM, Rind D (1985) Does the ocean-atmosphere system have more than one stable mode of operation? Nature 315:21–26
Christoph M, Barnett TP, Roeckner E (1998) The Antarctic Circumpolar Wave in a Coupled Ocean-Atmosphere GCM. J Climate 11:1659–1672
Cubasch U, Hasselmann K, Höck H, Maier-Reimer E, Mikolajewicz U, Santer BD, Sausen R (1992) Timedependent greenhouse warming computations with a coupled ocean-atmosphere model. Climate Dyn 8:55–69
Delworth T, Manabe S, Stouffer RJ (1993) Interdecadal variations of the thermohaline circulation in a coupled ocean-atmosphere model. J Climate 6:1993–2011
IPCC, Climate Change (1992) The Supplementary Report to the IPCC Scientific Assessment. Edited by JT Houghton, BA Callander and SKV Varney. Cambridge University Press 200 pp
Kaplan A, Cane MA, Kushnir Y, Clement AC, Blumenthal MB, Rajagopalan B (1997) Analyses of global sea surface temperature 1856-1991. J Geophys Res 102:27835–27860
Lau N-C (1985) Modeling the seasonal dependence of the atmospheric responses to observed El Niños 1962-1976. Mon Wea Rev 113:1970–1996
Latif M (2001) Tropical Pacific/Atlantic Ocean Interactions at multi-decadal time scale. Geophys Res Lett 28:539–542
Latif M, Roeckner E, Mikolajewicz U, Voss R (2000) Tropical stabilisation of the thermohaline circulation in a greenhouse warming simulation. J Climate 13:1809–1813
Manabe S, Stouffer RJ (1994) Multiple-century response of a coupled ocean-atmosphere model to an increase of atmospheric carbon dioxide. J Climate 7:5–23
Manabe S, Stouffer RJ (1995) Simulation of abrupt climate change induced by freshwater input to the North Atlantic Ocean. Nature 378:165–167.
Manabe S, Stouffer RJ (1999) The role of thermohaline circulation in climate. Tellus 51:91–109
Manabe S, Stouffer R, Spelman M, Bryan K (1991) Transient responses of a coupled ocean-atmosphere model to gradual changes of atmospheric CO2. Part I: Annual mean response. J Climate 4:785–818
Mikolajewicz U, Voss R (2000) The role of the individual air-sea flux components in CO2-induced changes of the ocean’s circulation and climate. Climate Dyn 16:627–642
Mikolajewicz U, Santer BD, Maier-Reimer E (1990) Ocean response to greenhouse warming. Nature 345:589–593.
Neelin JD, Dijkstra HA (1995) Ocean-atmosphere interaction and the tropical climatology. Part I: The dangers of flux correction. J Climate 8:1325–1342
Oberhuber JM, Roeckner E, Christoph M, Esch M, Latif M (1998) Predicting the ′97 El Niño event with a global climate model. Geophys Res Lett 25:2273–2276
Parker DE, Jackson M, Horton EB (1995) The GISST 2.2 sea surface temperature and sea ice climatology. Climate Research Technical Note 63, Hadley Centre, Meteorological Office, Bracknell, UK, 35 pp
Philander SGH (1990) El Nino, La Niña, and the Southern Oscillation. Academic Press, San Diego, 293 pp
Rahmstorf S (1995) Bifurcations of the Atlantic thermohaline circulation in response to changes in the hydrological cycle. Nature 378:145–149
Rahmstorf S (1997) Risk of sea-change in the Atlantic. Nature 388:825–826
Rahmstorf S (1999) Shifting seas in the greenhouse? Nature 399:523–524
Roeckner E, Oberhuber JM, Bacher A, Christoph M, Kirchner I (1996) ENSO variability and atmospheric response in a global atmosphere-ocean GCM. Climate Dyn 12:737–754
Roeckner E, Bengtsson L, Feichter J, Lelieveld J, Rodhe H (1999) Transient climate change simulations with a coupled atmosphere-ocean GCM including the troposheric sulfur cycle. J Climate 12:3004–3032
Ropelewski CF, Halpert M (1987) Global and regional scale precipitation patterns associated with the El Nino/Southern Oscillation. Mon Wea Rev 115:1606–1627
Schiller A, Mikolajewicz U, Voss R (1997) The stability of the thermohaline circulation in a coupled ocean-atmosphere model. Climate Dyn 13:325–348
Schmittner A, Appenzeller C, Stocker TF (2000) Enhanced Atlantic freshwater export during El Niño. Geophys Res Lett 27:1163–1166
Stocker TF, Wright DG (1991) Rapid transitions of the ocean’s deep circulation induced by changes in surface water fluxes. Nature 351:729–732
Timmermann A, Latif M, Voss R, Groetzner A (1998) Northern Hemisphere interdecadal variability: A coupled air-sea mode. J Climate 11:1906–1931
Timmermann A, Oberhuber J, Bacher A, Esch M, Latif M, Roeckner E (1999) Increased El Niño frequency in a climate model forced by future greenhouse warming. Nature 398:694–697
Ulbrich U, Christoph M (1999) A shift of the NAO and increasing storm track activity over Europe due to anthropogenic greenhouse gas forcing. Climate Dyn 15,7:551–559
Wood RA, Keen AB, Mitchell JF, Gregory JM (1999) Changing spatial structure of the thermohaline circulation in response to atmospheric CO2 forcing in a climate model. Nature 399:572–575
Zhang X-H, Oberhuber J, Bacher A, Roeckner E (1998) Interpretation of interbasin exchange in an isopycnal ocean model. Climate Dyn 14:725–740
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Latif, M. (2003). Tropical Pacific Influences on the North Atlantic Thermohaline Circulation. In: Wefer, G., Lamy, F., Mantoura, F. (eds) Marine Science Frontiers for Europe. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-55862-7_1
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DOI: https://doi.org/10.1007/978-3-642-55862-7_1
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