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Hysteresis behavior of the Atlantic ocean circulation identified in observational data

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Dima M., and G. Lohmann

Editorial: Journal of Climate, 24(2), p.397-403, 2011.

Rezumat:

Based on the multidecadal component of a Fram Strait Sea Ice Export reconstruction and on a sea surface temperature proxy for changes in the ocean circulation, we construct a bifurcation diagram for two cycles of the Atlantic Multidecadal Oscillation. It suggests a hysteresis behavior that is consistent with non-linear convective adjustment to changes in deep water formation in the North Atlantic and with the meridional overturning circulation bistability associated to two distinct configurations of the North Atlantic subpolar gyre, simulated in response to idealized CO2 increase. The nonlinear dynamics of the Atlantic ocean circulation emphasized here based on observational data adds to the hysteresis behavior shown in theoretical and numerical studies.

Cuvinte cheie: circulatia termohalina, comportament de tip histerezis, schimbari climatice bruste // thermohaline circulation, hysteresis behaviour, abrupt climate changes

URL: http://journals.ametsoc.org/doi/abs/10.1175/2010JCLI3467.1