Formation and propagation of great salinity anomalies

Details Formation and propagation of great salinity anomalies Formation and propagation of great salinity anomalies

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30i..26h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 9, pp. 26-1, CiteID 1473, DOI 10.1029/2003GL017065

Physics

42

Oceanography: General: Arctic And Antarctic Oceanography, Oceanography: General: Numerical Modeling, Oceanography: General: Climate And Interannual Variability (3309), Oceanography: Physical: Ice Mechanics And Air/Sea/Ice Exchange Processes

Scientific paper

North Atlantic/Arctic ocean and sea ice variability for the period 1948-2001 is studied using a global Ocean General Circulation Model coupled to a dynamic/thermodynamic sea ice model forced by daily NCEP/NCAR reanalysis data [Kalnay et al., 1996]. Variability of Arctic sea ice properties is analysed, in particular the formation and propagation of sea ice thickness anomalies that are communicated via Fram Strait into the North Atlantic. These export events led to the Great Salinity Anomalies (GSA) of the 1970s, 1980s and 1990s in the Labrador Sea (LS). All GSAs were found to be remotely excited in the Arctic, rather than by local atmospheric forcing over the LS. Sea ice and fresh water exports through the Canadian Archipelago (CAA) are found to be only of minor importance, except for the 1990s GSA. Part of the anomalies are tracked to the Newfoundland Basin, where they enter the North Atlantic Current. The experiments indicate only a minor impact of a single GSA event on the strength of the North Atlantic Thermohaline Circulation (THC).

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