A tracer study of the Arctic Ocean's liquid freshwater export variability.

Jahn, A., Tremblay, L. B., Newton, R., Holland, M. M., Mysak, L. A. and Dmitrenko, Igor A. (2010) A tracer study of the Arctic Ocean's liquid freshwater export variability. Open Access Journal of Geophysical Research: Oceans, 115 . C07015. DOI 10.1029/2009JC005873.

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Abstract

We present an analysis of the variability of the liquid Arctic freshwater (FW) export, using a simulation from the Community Climate System Model Version 3 (CCSM3) that includes passive tracers for FW from different sources. It is shown that the FW exported through the western Canadian Arctic Archipelago (CAA) comes mainly from the Pacific and from North American runoff. The variability of the FW export from both of these sources is generally in phase, due to the strong influence of variations of the velocity anomaly on the CAA FW export variability. The velocity anomaly in the CAA is in turn mainly governed by variations in the large-scale atmospheric circulation (i.e., the Arctic Oscillation). In Fram Strait, the FW export is mainly composed of Eurasian runoff and FW of Pacific origin. The variability of the Fram Strait FW export is governed both by changes in the velocity and in the FW concentration, and the variability of the FW concentration from the two largest sources is not in phase. The Eurasian runoff export through Fram Strait depends strongly on the release of FW from the Eurasian shelf, which occurs during years with an anticyclonic circulation anomaly (negative Vorticity index) and takes 3 years to reach Fram Strait after leaving the shelf. In contrast, the variability of the Pacific FW export through Fram Strait is mainly controlled by changes in the Pacific FW storage in the Beaufort Gyre, with an increased export during years with a cyclonic circulation anomaly (positive Vorticity index).

Document Type: Article
Keywords: Oceanography; Freshwater export; Arctic Ocean ; tracers ; modeling
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2009JC005873
ISSN: 2169-9275
Projects: Polynya, Laptev Sea System
Date Deposited: 28 Jul 2010 08:11
Last Modified: 25 Apr 2018 09:08
URI: http://oceanrep.geomar.de/id/eprint/8733

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