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Earth System Science Data The Data Publishing Journal
https://doi.org/10.5194/essd-2018-50
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
24 Apr 2018
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This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).
SURATLANT: a 1993–2017 surface sampling in the central part of the North Atlantic subpolar gyre
Gilles Reverdin1, Nicolas Metzl1, Solveig Olafsdotir2, Virginie Racapé3, Taro Takahashi4, Marion Benetti5, Hedinn Vadimarsson2, Alice Benoit-Cattin2, Magnus Danielsen2, Jonathan Fin1, Aïcha Naamar1, Denis Pierrot6, Kevin Sullivan6, Francis Bringas6, and Gustavo Goni6 1Sorbonne Université/CNRS/IRD/MNHN, Laboratoire d'océanographie et du climat : expérimentations et approches numériques (LOCEAN), Paris, France
2Marine and Freshwater Research Institute, Reykjavik, Iceland
3Laboratoire d'Océanographie Physique et Spatiale (LOPS), CNRS/Ifremer/IRD/UBO-IUEM, Brest, France
4Lamont-Doherty Earth Observatory (LDEO), Columbia University, Palisades, NY, USA
5Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland
6National Oceanic and Atmospheric Administration/Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida, USA
Abstract. This paper presents the SURATLANT dataset (SURveillance ATLANTique), consisting of individual data of temperature, salinity, parameters of the carbonate system, nutrients and water stable isotopes (δ18O and δD) collected mostly from ships of opportunity since 1993 along transects between Iceland and Newfoundland (https://doi.org/10.17882/54517). We discuss how the data are validated, qualified, their accuracy and the overall characteristics of the data set. The data are used to reconstruct seasonal cycles and interannual anomalies, in particular of Sea Surface Salinity (SSS), inorganic nutrients, dissolved inorganic carbon (DIC) and its isotopic composition δ13CDIC, total alkalinity (At), and water isotope concentrations. Derived parameters, such as fCO2 and pH are also estimated. The relation between salinity and At is estimated in these data to investigate the possibility to replace missing At when estimating other parameters of the carbonate system. We compare the seasonal cycle derived from these data with other climatologies. We find a period of small seasonal change between January and late April, except on the Newfoundland shelf/continental slope, when changes related with spring-stratification and blooms occur earlier. The data were collected in a period of multi-decennial variability associated with the Atlantic meridional oscillation with warming between 1994 and 2004–2007, and the recent cooling having peaked in 2014–2016. We also observe strong salinification in 2004–2009 and fresher waters in 1994–1995 as well as since 2010 south of 54° N and in 2016–2017 north of 54° N. Indication of multi-decadal variability is also suggested by other variables, such as phosphate or DIC, but cannot be well resolved seasonally with the discrete sampling and in the presence of interannual variability. As a whole, over the 24 years ocean fCO2 trend (+1.9 µatm yr-1) is close to the atmospheric trend and associated with an increase in DIC (+0.70 μmol kg-1 yr-1). The data also revealed a "canonical" pH decrease of −0.002 yr-1. There is also a decrease in δ13CDIC between 2005 and 2017 (in winter, −0.015 ‰ yr-1, but larger in summer, −0.042 ‰ yr-1), suggesting significant anthropogenic carbon signal at play together with other processes (mixing, biological activity).
Citation: Reverdin, G., Metzl, N., Olafsdotir, S., Racapé, V., Takahashi, T., Benetti, M., Vadimarsson, H., Benoit-Cattin, A., Danielsen, M., Fin, J., Naamar, A., Pierrot, D., Sullivan, K., Bringas, F., and Goni, G.: SURATLANT: a 1993–2017 surface sampling in the central part of the North Atlantic subpolar gyre, Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2018-50, in review, 2018.
Gilles Reverdin et al.
Gilles Reverdin et al.

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SURATLANT: a 1993-2017 surface dataset in the central part of the North Atlantic subpolar gyre G. Reverdin, N. Metzl, S. Olafsdottir, V. Racapé, T. Takahashi, M. Benetti, H. Valdimarsson, P. D. Quay, A. Benoit-Cattin, M. Danielsen, J. Fin, A. Naamar, D. Pierrot, K. Sullivan, F. Bringas, and G. Goni https://doi.org/10.17882/54517
Gilles Reverdin et al.

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This paper presents the SURATLANT dataset (SURveillance ATLANTique), consisting of individual data of temperature, salinity, parameters of the carbonate system, nutrients and water stable isotopes (d18O and dD) collected mostly from ships of opportunity since 1993 along transects between Iceland and Newfoundland. These data are used to quantify the seasonal cycle and can be used to investigate long term tendencies in the surface ocean, including of pCO2 and pH.
This paper presents the SURATLANT dataset (SURveillance ATLANTique), consisting of individual...
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