New and regenerated sources of nitrogen: from the ice edge to the equator in the South Pacific Ocean ...

The distribution of diazotrophs and the magnitude of N2 fixation along with the input of new N through this process remains poorly constrained globally, but particularly in the Southern Pacific Ocean. Here we present a high-resolution dataset (every 0.5° latitude) describing the different N-cycling...

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Bibliographic Details
Main Authors: Raes, Eric J, Van De Kamp, Jodie, Bodrossy, Levente, Fong, Allison A, Riekenberg, Jessica, Eyre, Bradley D, Waite, Anya M
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2018
Subjects:
Biological Oceanography @ AWI AWI_BioOce
Antarc*
Antarctic
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.885170
https://doi.pangaea.de/10.1594/PANGAEA.885170
Description
Summary:The distribution of diazotrophs and the magnitude of N2 fixation along with the input of new N through this process remains poorly constrained globally, but particularly in the Southern Pacific Ocean. Here we present a high-resolution dataset (every 0.5° latitude) describing the different N-cycling pathways which control the fixation and sequestration of carbon in the surface waters along a 7000 km transect in the South Pacific Ocean. Key oceanographic features along the P15S GO-SHIP transect from the Antarctic ice edge to the equator, included crossing of the subtropical front (STF), from the sub-Antarctic waters towards the oligotrophic tropics, and the equatorial upwelling region. We show how the natural isotopic abundance of particulate organic matter relate to different biogeochemical transformations in the N-cycle across four oceanic provinces. At all stations we measured N2 fixation rates. In the cold and nutrient rich waters of the Southern Ocean we found measurable N2 fixation rates (>0.2 nmol ...

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