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Valorisation des campagnes à la mer Navires Ifremer - IRD - IPEV Card “ Valorization of oceanographic cruise ” Cruise name : WNA 05 Program : SFB-460 'Dynamics of thermohaline circulation variability’ Vessel : Thalassa Heavy engin : Dates : July 16. - August 15. 2005 Area : Labrador Sea, Subpolar North Atlantic Chef de projet : Jürgen Fischer Chef de mission : Jürgen Fischer Institut : IFM-GEOMAR Institut : IFM-GEOMAR Name of the drafter : Jürgen Fischer Date of rédaction : 5. September 2006 – actualisée 2011 Address : Leibniz Institute of Marine Sciences, Düsternbrooker Weg 20, 24145 Kiel, Gemany Email :[email protected] Tel :+49-431-600-4106 Fax : +49-431-600-4102 Abstracts of principal results 1 or 2 pages to inform a large public of the exploitation of the cruise The western subpolar North Atlantic is an important region for the thermohaline circulation of the oceans. In this area, the two North Atlantic Deep Water (NADW) components from the Nordic Seas merge, and the shallowest NADW component, the Labrador Sea Water (LSW) is formed by deep convection in the Labrador Sea. The NADW is then exported southward and for compensation warm surface waters are carried northward with the North Atlantic current. These processes, formation, transformation of water masses and the export of newly formed water masses show significant interannual variability. The objectives of the research program were to investigate and quantify the components that contribute to the variability. On the research cruise WNA_05 this was done by a combination of shipboard observations with CTD, current observations, and by analyzing water samples for CFC’s. These observations were accomplished by moored stations that are recovered and redeployed. All investigations are imbedded in the SFB-460 'Dynamics of thermohaline circulation variability’. This cruise also reflects the end of the observational period for most of its subprograms. The first part of the cruise focused on processes in the Labrador Sea. In this region large heat fluxes in winter cause deep ocean convection concentrated in the central Labrador Sea. This usually occurs in February / March, and is measured by ADCPs and T/S sondes in moored stations; lately, oxygen sensors and PCO2 measurements are also included to investigate CO2 uptake during convection. A large number of convective “plumes” will then form a larger scale convective patch and the integral properties (e.g., its mean temperature and salinity) can be observed by CTD and tracer measurements in the successive summer. Profiling and neutrally buoyant floats drifting through the area complement these measurements. The second part of the cruise was dedicated to the boundary current system which plays an important role in exporting newly formed water masses from their formation region to the open North Atlantic and farther toward the subtropical regime. Two boundary current arrays with current meters and T/S probes are used to determine the transport of deep water masses at the exit of the Labrador Sea, and at the transition of the subpolar to the subtropical regime (at the Tail of the Grand Banks). These long term records (up to 8years by now) are supplemented by boundary current sections with LADCP and underway measurements of upper ocean currents (shipboard ADCPs). Altogether, we recovered 10 current meter (sound source) moorings, and deployed 5 moorings, as planned. We experienced above normal data return und no instrument losses in the moorings. Summarizing, the mooring work and the CTD / LADCP work were very successful. The competent work by Captain Michel Delbarre and his crew, and the very kindly and pleasant atmosphere on board Thalassa contributed a lot to this success. Literature updated December 2010 Valorisation des campagnes à la mer Navires Ifremer - IRD - IPEV Avsic, T., J. Karstensen, U. Send, and J. Fischer, 2006. Interannual variability of newly formed Labrador Sea Water from 1994 to 2005, Geophys. Res. Lett., 33, L21S06, doi:10.1029/2006GL026913. Schott , F. A., Fischer, J., Dengler, M., and Zantopp, R., 2006, Variability of the Deep Western Boundary Current east of the Grand Banks, Geophys. Res. Lett., 33, L21S07, doi:10.1029/2006GL026563. Dengler, M., Fischer, J., Schott, F. A., and Zantopp, R., 2006, The Deep Labrador Current and its variability in 1996-2005, Geophys. Res. Lett., 33, L21S06, doi:10.1029/2006GL026702. Fischer, J., M. Visbeck, R. Zantopp, and N. Nunes (2010), Interannual to Decadal Variability of Outflow from the Labrador Sea, Geophys. Res. Lett., doi:10.1029/2010GL045321. [PDF] Han, G., K. Ohashi, N. Chen, P. G. Myers, N. Nunes, and J. Fischer (2010), Decline and partial rebound of the Labrador Current 1993-2004: Monitoring ocean currents from altimetric and CTD data, J. Geophys. Res., doi:10.1029/2009JC006091 [PDF] Valorisation des campagnes à la mer Navires Ifremer - IRD - IPEV Summary table Items Number 1 Original papers in SCI reviews (see list) 5 2 Publications in other types of review 0 3 Technical reports (cruise report) 1 4 Paper in popular reviews 0 5 Publication of symposium abstracts 0 6 0 8 International communications Oral communications Posters National communications Oral communications Posters New species (animals, microorganisms) discovered 9 Reports to international institutions (UE, FAO…) 10 Applications (thérapeutiques cliniques, AMM …) 11 Licences 12 Publications of atlas (maps, photos) 13 Video, films 14 Internet papers 15 Masters 16 PHDs 17 Data validation 18 Transmission to SISMER No : .... Yes : .... 19 Transmission to other data banks No : .... Yes : .... 20 Transmission to other teams No : .... Yes : .... 21 State of the exploitation 7 in progress : yes in progress : yes 0 Finished : yes Finished : .... In annex furnish the references of papers, communications, reports….classified according to each items