Abstract
Abstract. The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this special issue (https://www.biogeosciences.net/special_issue900.html), results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among 18 articles. Here, the scientific context, project objectives, and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.
Highlights
Introduction to the French GEOTRACES NorthAtlantic Transect (GA01): GEOVIDE cruiseGéraldine Sarthou1, Pascale Lherminier2, Eric P
The comparison with the 2002–2012 mean state shows a different repartition of the northward warm currents that compose the upper limb of the Meridional Overturning Circulation (MOC), with a more intense Irminger Current and a weaker North Atlantic Current (NAC) in the West European Basin, these anomalies being compatible with the variability previously observed along the OVIDE section in the 2000s (Zunino et al, 2017)
Despite the negative temperature anomalies in the surface waters, the heat transport across the OVIDE section estimated during GEOVIDE was the largest measured since 2002. This was attributed to the relatively strong MOC measured across the OVIDE section during GEOVIDE (Zunino et al, 2017) and more to the strong transport of central water in the central and southern branch of the NAC (García-Ibáñez et al, 2018) that compensates the cold anomaly of the surface layer
Summary
Understanding the distribution, sources, and sinks of trace elements and isotopes (TEIs) will improve our ability to understand past and present marine environments. Missing from this dataset was the North Atlantic Ocean (De La Rocha et al, 2011) In this general context, the main scientific objectives of GEOVIDE were to (i) better understand and quantify the MOC and the carbon cycle carbon cycle in the context of decadal variability, adding new tracers to this end; (ii) map the TEI distributions, including their physical and chemical speciation, along this full-depth high-resolution ocean section; (iii) investigate the links between TEIs and the production, export, and remineralization of particulate organic matter; (iv) identify TEI sources and sinks, and quantify their fluxes at the ocean boundaries; and (v) better understand and quantify the paleoproxies 231Pa/230Th, εNd, and δ30Si
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