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Earth System Dynamics An interactive open-access journal of the European Geosciences Union

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doi:10.5194/esd-2016-74
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
02 Jan 2017
Review status
A revision of this discussion paper was accepted for the journal Earth System Dynamics (ESD) and is expected to appear here in due course.
The polar amplification asymmetry: Role of antarctic surface height
Marc Salzmann Institute for Meteorology, Universit├Ąt Leipzig, Vor dem Hospitaltore 1, 04103 Leipzig, Germany
Abstract. Previous studies have attributed an overall weaker (or slower) polar amplification in Antarctica compared to the Arctic to a weaker antarctic surface albedo feedback and also to more efficient ocean heat uptake in the Southern Ocean in combination with antarctic ozone depletion. Here, the role of the antarctic surface height for meridional heat transport and local radiative feedbacks including the surface albedo feedback was investigated based on CO2 doubling experiments in a low resolution coupled climate model. If Antarctica was assumed to be flat, the north-south asymmetry of the zonal mean top of the atmosphere radiation budget was significantly reduced. Doubling CO2 in a flat Antarctica ("flat AA") model setup led to a stronger increase of southern hemispheric poleward atmospheric and oceanic heat transport compared to the base model setup. Based on partial radiative perturbation (PRP) computations it was shown that local radiative feedbacks and an increase of the CO2 forcing in the deeper atmospheric column also contributed to stronger antarctic warming in the flat AA model setup, and the roles of the individual radiative feedbacks are discussed in some detail. A significant fraction (between 24 and 80 % for three consecutive 25-year time slices starting in year 51 and ending in year 126 after CO2 doubling) of the polar amplification asymmetry was explained by the difference in surface height, but the fraction was subject to transient changes, and might to some extent also depend on model uncertainties.

Citation: Salzmann, M.: The polar amplification asymmetry: Role of antarctic surface height, Earth Syst. Dynam. Discuss., doi:10.5194/esd-2016-74, in review, 2017.
Marc Salzmann
Marc Salzmann

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Short summary
The Arctic has been warming much faster than the rest of the globe including Antarctica. Here it was shown that one of the important mechanisms that sets apart Antarctica from the Arctic is heat transport from higher latitudes, and it was argued that a decrease in land height due to antarctic melting would be favorable for increased atmospheric heat transport from mid latitudes. Other factors related to the larger Antarctic land height were also investigated.
The Arctic has been warming much faster than the rest of the globe including Antarctica. Here it...
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