AMOC sensitivity to surface buoyancy fluxes: Stronger ocean meridional heat transport with a weaker volume transport?

Sevellec, Florian; Fedorov, Alexey V.

doi:10.1007/s00382-015-2915-4

AMOC sensitivity to surface buoyancy fluxes: Stronger ocean meridional heat transport with a weaker volume transport?

Journal Article · Mon Jan 04 00:00:00 EST 2016 · Climate Dynamics

DOI:https://doi.org/10.1007/s00382-015-2915-4· OSTI ID:1437164

Sevellec, Florian ^[1]; Fedorov, Alexey V. ^[2]

Univ. of Southampton (United Kingdom). Ocean and Earth Science, National Oceanography Centre Southampton; Univ Southampton, Natl Oceanog Ctr Southampton, Ocean & Earth Sci, Waterfront Campus,European Way, Southampton SO14 3ZH, Hants, England
Yale Univ., New Haven, CT (United States). Dept. of Geology and Geophysics

Oceanic northward heat transport is commonly assumed to be positively correlated with the Atlantic meridional overturning circulation (AMOC). For example, in numerical "water-hosing" experiments, imposing anomalous freshwater fluxes in the northern Atlantic leads to a slow-down of the AMOC and the corresponding reduction of oceanic northward heat transport. Here, we study the sensitivity of the ocean heat and volume transports to surface heat and freshwater fluxes using a generalized stability analysis. For the sensitivity to surface freshwater fluxes, we find that, while the direct relationship between the AMOC volume and heat transports holds on shorter time scales, it can reverse on timescales longer than 500 years or so. That is, depending on the model surface boundary conditions, reduction in the AMOC volume transport can potentially lead to a stronger heat transport on long timescales, resulting from the gradual increase in ocean thermal stratification. Finally, we discuss the implications of these results for the problem of steady state (statistical equilibrium) in ocean and climate GCM as well as paleoclimate problems including millennial climate variability.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Southampton (United Kingdom)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0007037

OSTI ID:: 1437164

Journal Information:: Climate Dynamics, Journal Name: Climate Dynamics Journal Issue: 5-6 Vol. 47; ISSN 0930-7575

Publisher:: Springer-VerlagCopyright Statement

Country of Publication:: United States

Language:: English

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