Pan-Arctic Ocean Primary Production Constrained by Turbulent Nitrate Fluxes.

Randelhoff, Achim, Holding, Johnna, Janout, Markus, Sejr, Mikael Kristian, Babin, Marcel, Tremblay, Jean-Éric and Alkire, Matthew B. (2020) Pan-Arctic Ocean Primary Production Constrained by Turbulent Nitrate Fluxes. Open Access Frontiers in Marine Science, 7 (150). DOI 10.3389/fmars.2020.00150.

[img]
Preview
Text
fmars-07-00150.pdf - Published Version
Available under License Creative Commons: Attribution 4.0.

Download (3452Kb) | Preview
[img]
Preview
Text
Data_Sheet_1_Pan-Arctic Ocean Primary Production Constrained by Turbulent Nitrate Fluxes.pdf - Supplemental Material
Available under License Creative Commons: Attribution 4.0.

Download (1071Kb) | Preview

Supplementary data:

Abstract

Arctic Ocean primary productivity is limited by light and inorganic nutrients. With sea ice cover declining in recent decades, nitrate limitation has been speculated to become more prominent. Although much has been learned about nitrate supply from general patterns of ocean circulation and water column stability, a quantitative analysis requires dedicated turbulence measurements that have only started to accumulate in the last dozen years. Here we present new observations of the turbulent vertical nitrate flux in the Laptev Sea, Baffin Bay, and Young Sound (North-East Greenland), supplementing a compilation of 13 published estimates throughout the Arctic Ocean. Combining all flux estimates with a Pan-Arctic database of in situ measurements of nitrate concentration and density, we found the annual nitrate inventory to be largely determined by the strength of stratification and by bathymetry. Nitrate fluxes explained the observed regional patterns and magnitudes of both new primary production and particle export on annual scales. We argue that with few regional exceptions, vertical turbulent nitrate fluxes can be a reliable proxy of Arctic primary production accessible through autonomous and large-scale measurements. They may also provide a framework to assess nutrient limitation scenarios based on clear energetic and mass budget constraints resulting from turbulent mixing and freshwater flows.

Document Type: Article
Keywords: Arctic, turbulence, nitrate, flux, primary production, climate change, sea ice
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3389/fmars.2020.00150
ISSN: 2296-7745
Projects: Enrichment, CATS
Date Deposited: 06 Apr 2020 14:00
Last Modified: 09 Oct 2020 09:22
URI: http://oceanrep.geomar.de/id/eprint/49373

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...