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OFI mobilizes knowledge by sharing the results of our research through contributions in journals, books, papers and other scientific publications.

Mar 26, 2019 | Douglas W. R. Wallace Elizabeth Kerrigan Claire Normandeau

A rare intercomparison of nutrient analysis at sea: lessons learned and recommendations to enhance comparability of open-ocean nutrient data

An intercomparison study has been carried out on the analysis of inorganic nutrients at sea following the operation of two nutrient analysers simultaneously on the GO-SHIP A02 trans-Atlantic survey in May 2017. Both instruments were Skalar San++ Continuous Flow Analyzers, one from the Marine Institute, Ireland and the other from Dalhousie University, Canada, each operated by their own laboratory analysts following GO-SHIP guidelines while adopting their existing laboratory methods. There was high comparability between the two data sets and vertical profiles of nutrients also compared well with those collected in 1997 along the same A02 transect by the World Ocean Circulation Experiment.

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Mar 20, 2019 | Julie LaRoche Debany Fonseca-Batista

Evidence of high nitrogen fixation rates in the temperate northeast Atlantic

Dinitrogen (N2) fixation is the major pathway of nitrogen (N) input to the global ocean and thereby contributes to sustaining oceanic primary productivity (Falkowski, 1997). The conversion by N2-fixing micro-organisms (diazotrophs) of dissolved N2 gas into bioavailable nitrogen also contributes to new production in the euphotic layer and, as such, to the subsequent sequestration of atmospheric carbon dioxide into the deep ocean (Gruber, 2008). Estimating the overall contribution of N2 fixation to carbon sequestration in the ocean requires an assessment of the global marine N2 fixation.

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Mar 12, 2019 | Julie LaRoche

Drivers of Regional Bacterial Community Structure and Diversity in the Northwest Atlantic Ocean

The fundamental role of bacteria in global biogeochemical cycles warrants a thorough understanding of the factors controlling bacterial community structure. In this study, the integrated effect of seasonal differences and spatial distribution on bacterial community structure and diversity were investigated at the regional scale.

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Feb 01, 2019 | Brad deYoung

A sea change in our view of overturning circulation in the subpolar North Atlantic

The report provides an observational basis for the Intergovernmental Panel on Climate Change projections of a slowing Atlantic meridional overturning circulation (MOC) in the 21st century.

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Jan 09, 2019 | Lin Cheng

An international intercomparison of stable carbon isotope composition measurements of dissolved inorganic carbon in seawater

We report results of an intercomparison of stable carbon isotope ratio measurements in seawater dissolved inorganic carbon (δ13C‐DIC) which involved 16 participating laboratories from various parts of the world. The intercomparison involved distribution of samples of a Certified Reference Material for seawater DIC concentration and alkalinity and a preserved sample of deep seawater collected at 4000 m in the northeastern Atlantic Ocean.

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Jan 04, 2019 | William Perrie

Dynamical downscaling of the Arctic climate with a focus on polar cyclone climatology

We present a dynamical downscaling of the Arctic climatology using a high-resolution implementation of the Polar Weather Research and Forecasting, version 3.6 (WRF3.6) model, with a focus on Arctic cyclone activity. The study period is 1979–2004 and the driving fields are data from the Hadley Centre Global Environmental Model, version 2, with an Earth System component (HadGEM2-ES) simulations.

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