Pan-European infrastructure for ocean & marine data management

Cruise Summary Report Inventory (CSR)

Cruise Summary Report of Thalassa Cruise OVIDE 2018 (BSH Ref-No.: 20185720)

Thalassa
11.06.2018
15.07.2018
Brest, France
Brest, France
LHERMINIER PASCALE - Ocean Physics and Satellite oceanography laboratory (LOPS) - UMR 6523 CNRS-Ifremer-IRD-UBO
Ocean Physics and Satellite oceanography laboratory (LOPS) - UMR 6523 CNRS-Ifremer-IRD-UBO
North Atlantic Ocean
WEST EAST SOUTH NORTH
-45 -9 40 60
Bassin Ouest-Européen, Bassin d'Islande, Mer d'Irminger
 ›› GML track
LEFE - LEFE / CNRM - National Center For Meteorological Research - Toulouse
OVIDE - OVIDE / LABORATORY of PHYSICAL OCEANOGRAPHY (LPO) UMR 6523 CNRS-IFREMER-IRD-UBO

The North Atlantic Ocean is a major driver of the European climate at seasonal to multi-decadal timescales. It also contributes to damp the impact of human activity on climate by storing part of the anthropogenic COand heat excess related to the strengthening of the greenhouse effect. In this project, we focus on the subpolar North Atlantic for which the interannual to decadal variability is much more important than the climatic trends associated to the anthropogenic perturbations. After a relatively warm and salty decade in the 2000s, the subpolar North Atlantic shifted to a cold and fresh state in 2012 that presents some similarities with that observed at the beginning of the 1990s, but in a context of warming in all the other oceans of the planet. This change is also characterized up to now by a deeper convection and an increase in the amplitude of the Meridional Overturning Circulation (MOC). In this context, the project aims to quantify the variability of the horizontal circulation, the MOC, the heat budget, the carbon budget and the water mass properties by repeating the OVIDE-A25 section in June-July 2018, from Portugal to Greenland. The section is composed of 98 stations that combine hydrographic, biogeochemical and current measurements down to the bottom.





Data of the CTDOprobe are complemented with measurements of pH, alkalinity and nutrients to determine the concentration in dissolved inorganic carbon and anthropogenic carbon. Independent measurements of the isotopic fractions of carbon and oxygen in certain areas also help to follow the anthropogenic signal and the sources of fresh water respectively. In order to determine the age and the origin of the water masses, four anthropic tracers are measured from the sampled sea water: chlorofluorocarbon (CFC), Sulfur hexafluoride (SF6), iodine and uranium isotopes. Currents are determined by Acoustic Doppler Current Profilers (mounted on the ship and on the rosette), that are combined to the currents deduced from density gradients to obtained absolute geostrophic velocities and transports across the section. The deployment of deep-Argo floats in specific circulation features identified in real time brings additional information on the deep circulation that suffers from a lack of observations, as revealed by our previous studies. The oceanic currents around the Reykjanes Ridge is studied with the renewal of 2 ASFAR moorings (Autonomous System for Argo floats Release) that release an ARGO float at pre-determined dates. The data analysis of the survey is performed in synergy with the Argo and OSNAP programs, the satellite altimetry, the oceanic re-analysis (ISAS, EN4, ORAS4, GLORYS) and the output of physical-biogeochemical coupled models. 

current profilers
CTD
discrete water samplers
LHERMINIER PASCALE -  Ocean Physics and Satellite oceanography laboratory (LOPS) - UMR 6523 CNRS-Ifremer-IRD-UBO
Dr. F.F. PEREZ -  CSIC-IIM/ Institute of Marine Research
METZL NICOLAS -  Laboratory of Oceanography and Climate : Experiments and numerical Approaches - UMR 7159
VOELKER ANTJE -  Portuguese Institute of Ocean and Atmosphere
REVERDIN GILLES -  Laboratory of Oceanography and Climate : Experiments and numerical Approaches - UMR 7159
CASTRILLEJO IRIDOY MAXI -  Eth Zürich - Laboratory Of Ion Beam Physics
MESSIAS MARIE-JOSÉ -  University of Exeter, Biosciences Department

Summary of Measurements and Samples

PI Number Type Unit Type of measurement Description Reference date
A 2220 H21 samples Oxygen Dissolved oxygen (Winkler titration) 11.06.2018
A 2215 H22 samples Phosphate Phosphates 11.06.2018
A 2215 H24 samples Nitrate Nitrates-Nitrites 11.06.2018
A 2215 H26 samples Silicate Silicic acid 11.06.2018
B 911 H27 samples Alkalinity Total alkalinity 11.06.2018
C 50 H27 samples Alkalinity Total alkalinity 11.06.2018
B 2192 H28 samples pH pH 11.06.2018
B 326 H33 samples Other dissolved gases Nitrous oxyde (N2O), Methane (CH4) 11.06.2018
B 174 H74 samples Carbon dioxide DIC 11.06.2018
B 30 H74 days Carbon dioxide Underway water surface pCO2 11.06.2018
C 50 H74 samples Carbon dioxide DIC 11.06.2018
PI Number Type Unit Type of measurement Description Reference date
A 102 D71 profiles Current profiler (eg ADCP) Lowered ADCP (2 on the rosette) 11.06.2018
A 30 D71 days Current profiler (eg ADCP) Ship ADCP - OS 150 kHz 11.06.2018
A 30 D71 days Current profiler (eg ADCP) Ship ADCP - OS 38kHz 11.06.2018
A 2220 H09 samples Water bottle stations Chemical analysis of salinity with a Portasal salinometer 11.06.2018
A 104 H10 profiles CTD stations pressure, temperature, salinity, dissolved oxygen 11.06.2018
D 70 H32 samples Isotopes Carbon-13 11.06.2018
D 199 H32 samples Isotopes Oxygen-18 11.06.2018
E 168 H32 samples Isotopes Carbon 13 11.06.2018
E 203 H32 samples Isotopes Oxygen-18, Deuterium 11.06.2018
F 125 H32 samples Isotopes Carbon 14 11.06.2018
F 125 H32 samples Isotopes Iodine-129 (129I) 11.06.2018
F 34 H32 samples Isotopes Uranium-236 (236U) 11.06.2018
A 30 H71 days Surface measurements underway (T,S) temperature, salinity 11.06.2018
G 1730 H73 samples Geochemical tracers (eg freons) Fluorocarbon (CFC-11, CFC-12, CFC-113), Carbon tetrachloride (CCl4), sulfur hexafluoride (SF6) 11.06.2018