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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