Program and Agenda

Abstract

15 YEARS OF DEEP WESTERN BOUNDARY CURRENT OBSERVATIONS AT THE EXIT OF THE LABRADOR SEA AT 53°N

Since 1997 a moored observatory has been installed at 53°N with varying spatial coverage near the western exit region of the Labrador Sea. The most recent installment of the moored array places an emphasis on current and water mass measurements in the core of the Denmark Strait Overflow Water (DSOW) as it exits the Labrador Sea but also covers the depth range of classical Labrador Sea Waters. The analysis of this data set indicates no discernable trend in the deep flows. However, we find significant high frequency variability, and on longer time scales primarily two modes of variability: one pulsating mode (covering 31% of the variability) which strengthens and weakens the flow at the central core location, and one meandering mode (covering 44% of the variability) with the core moving up and down the shelf break, stretching and thinning during the process. We present transport estimates for the density range greater than 27.80 (temperatures less than 3.0°C) for two time periods more than 10 years apart. The observed transports are compared to the hindcast results of high resolution ocean models. These are taken in the context of other observatory locations in the western subpolar North Atlantic, specifically from further upstream at Denmark strait and downstream at the Grand Banks off Newfoundland reaching 26°N to the UK/US RAPID/MOCHA observing system.

Authors

Visbeck, M., GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel, Germany, mvisbeck@geomar.de

Fischer, J., GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel, Germany, mvisbeck@geomar.de

Karstensen , J., GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel, Germany, mvisbeck@geomar.de

Zantopp, R., GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel, Germany, mvisbeck@geomar.de

Behrens, E., GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel, Germany, mvisbeck@geomar.de

Details

Oral presentation

Session #:137
Date: 2/28/2014
Time: 09:00
Location: 312

Presentation is given by student: No