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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2016-316
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Model experiment description paper
10 Jan 2017
Review status
This discussion paper is under review for the journal Geoscientific Model Development (GMD).
'Climate Response Functions' for the Arctic Ocean: a proposed coordinated modeling experiment
John Marshall1, Jeffery Scott1, and Andrey Proshutinsky2 1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307 USA
2Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA 02543-1050 USA
Abstract. A coordinated set of Arctic modeling experiments is proposed which explore how the Arctic responds to changes in external forcing. Our goal is to compute and compare 'Climate Response Functions' (CRFs) – the transient response of key observable indicators such as sea-ice extent, freshwater content of the Beaufort Gyre etc. – to abrupt 'step' changes in forcing fields across a number of Arctic models. Changes in wind, freshwater sources and inflows to the Arctic basin are considered. Convolutions of known or postulated time-series of these forcing fields with their respective CRFs then yields the (linear) response of these observables. This allows the project to inform, and interface directly with, Arctic observations and observers and IPCC models and the climate change community. Here we outline the rationale behind such experiments and illustrate our approach in the context of a coarse-resolution model of the Arctic based on the MITgcm. We conclude by outlining the expected benefits of such an activity and encourage other modeling groups to compute CRFs with their own models so that we might begin to document how robust they are to model formulation, resolution and parameterization.

Citation: Marshall, J., Scott, J., and Proshutinsky, A.: 'Climate Response Functions' for the Arctic Ocean: a proposed coordinated modeling experiment, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-316, in review, 2017.
John Marshall et al.
John Marshall et al.
John Marshall et al.

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Short summary
A coordinated set of Arctic modeling experiments is proposed which explore how the Arctic responds to abrupt changes in external forcing by computing 'Climate Response Functions' (CRFs). We illustrate the approach in the context of a coarse-resolution model of the Arctic and conclude by encouraging other modeling groups to compute CRFs with their own models so that we might begin to document how robust they are to model formulation, resolution and parameterization.
A coordinated set of Arctic modeling experiments is proposed which explore how the Arctic...
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