Investigation of long term variations the deep circulation in the western subpolar North Atlantic and ventilation of the Labrador and Irminger Seas - Cruise No. MSM40 - August 06 - August 25, 2014 - St. John's (Canada) - Brest (France)

• Main Authors: Karstensen, Johannes, Baumann, Till, Burmeister, Kristin, Herrford, Josefine, Kikas, Villu, Klenz, Thilo, Köhn, Eike, Liblik, Taavi, Morgain, Samuel, Müller, Katharina, Seemann, Ann Katrin, Skyraite, Simona
• Format: Report
• Language: English
• Published: DFG-Senatskommission für Ozeanographie 2015
• Subjects: Earth Science; Earth sciences and geology; Canada; North Atlantic
• Online Access: https://dx.doi.org/10.2312/cr_msm40; https://www.tib.eu/suchen/id/awi:a84f98c778a677667bfd6e8c7b67dae59e04c8b7

The core program of the THALASSA MSM40 expedition was dedicated to the re-deployment of moored instrumentation and to surveys of the water column along selected sections. Moored instrumentation, programmed for high temporal resolution sampling (<1 hour) are installed at distinct location to record the local evolution of physical properties (temperature, salinity, density, currents). Continuous installation of such systems over many years, and even up to decades at some locations, provide the observational base for the analysis of systematic changes of the interior ocean. In a global context only a few of such long lasting ocean reference-stations exists. Along selected sections the instantaneous vertical hydrographic (temperature, salinity, density), oxygen, and currents structure was surveyed during MSM40 with CTD/lADCP systems. These systems shall operate, when possible, over the full water depth, from the surface to the ocean bottom. Moreover, quasi continuous underway data collection was performed and including single depth data from the Thermosalinograph (Temperature, Salinity), surface meteorological observations, and ship mounted ADCP systems (currents in upper 500 to 1000m). An underway CTD system was used to survey the hydrography in the upper 300m from the moving ship (full speed). The THALASSA MSM40 expedition is a contribution to national (RACE) as well as international projects (NACLIM, OSNAP, FixO3). : MARIA S. MERIAN-Berichte