Destabilization of the thermohaline circulation by atmospheric transports: An analytic solution

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Journal of Climate

DOI:https://doi.org/10.1175/1520-0442(1998)011<1803:DOTTCB>2.0.CO;2· OSTI ID:659008

Krasovskiy, Y P; Stone, P H ^[1]

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1. Massachusetts Inst. of Tech., Cambridge, MA (United States). Program in Atmospheres, Oceans, and Climate

The four-box coupled atmosphere-ocean model of Marotzke is solved analytically, by introducing the approximation that the effect of oceanic heat advection on ocean temperatures is small (but not negligible) compared to the effect of surface heat fluxes. The solutions are written in a form that displays how the stability of the thermohaline circulation depends on the relationship between atmospheric meridional transports of heat and moisture and the meridional temperature gradient. In the model, these relationships are assumed to be power laws with different exponents allowed for the dependence of the transports of heat and moisture on the gradient. The approximate analytic solutions are in good agreement with Marotzke`s exact numerical solutions, but show more generally how the destabilization of the thermohaline circulation depends on the sensitivity of the atmospheric transports to the meridional temperature gradient. The solutions are also used to calculate how the stability of the thermohaline circulation is changed if model errors are corrected by using conventional flux adjustments. Errors like those common in GCMs destabilize the model`s thermohaline circulation, even if conventional flux adjustments are used. However, the resulting errors in the magnitude of the critical perturbations necessary to destabilize the thermohaline circulation can be corrected by modifying transport efficiencies instead.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FC03-90ER61010
• OSTI ID: 659008
• Journal Information: Journal of Climate, Journal Name: Journal of Climate Journal Issue: 7 Vol. 11; ISSN 0894-8755; ISSN JLCLEL
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC CIRCULATION
BOX MODELS
CLIMATIC CHANGE
DATA COVARIANCES
FORECASTING
HEAT FLUX
OCEANIC CIRCULATION