Journal
JOURNAL OF PHYSICAL OCEANOGRAPHY
Volume 40, Issue 11, Pages 2496-2510Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/2010JPO4487.1
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- Netherlands Organization of Scientific Research (NWO) through its Earth and Life Sciences Division [ALW854.00.037]
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Observations of sea ice extent and atmospheric temperature in the Arctic, although sparse, indicate variability on multidecadal time scales. A recent analysis of one of the global climate models [the Geophysical Fluid Dynamics Laboratory Climate Model, version 2.1 (CM2.1)] in the Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change has indicated that Arctic Ocean variability on these time scales is associated with changes in basin-wide salinity patterns. In this paper the internal modes of variability in an idealized Arctic Basin are determined by considering the stability of salinity-driven flows. An internal ocean mode with a multidecadal time scale is found, with a spatial pattern similar to that obtained in the analysis of the CM2.1 results. The modes propagate as a saline Rossby wave induced by the background salinity gradient.
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