The export flux of particulate organic carbon derived from Po-210/Pb-210 disequilibria along the North Atlantic GEOTRACES GA01 transect: GEOVIDE cruise

Yi Tang, Nolwenn Lemaitre, Maxi Castrillejo, Montserrat Roca-Martí, Pere Masqué, Gillian Stewart

Research output: Contribution to journalArticleResearch

6 Citations (Scopus)

Abstract

The disequilibrium between 210 Po activity and 210 Pb activity in seawater samples was determined along the GEOTRACES GA01 transect in the North Atlantic during the GEOVIDE cruise (May-June 2014). A steady-state model was used to quantify vertical export of particulate 210 Po. Vertical advection was incorporated into one version of the model using time-averaged vertical velocity, which had substantial variance. This resulted in large uncertainties for the 210 Po export flux in this model, suggesting that those calculations of 210 Po export fluxes should be used with great care. Despite the large uncertainties, there is no question that the deficits of 210 Po in the Iberian Basin and at the Greenland Shelf have been strongly affected by vertical advection. Using the export flux of 210 Po and the particulate organic carbon (POC) to 210 Po ratio of total (>1μm) particles, we determined the POC export fluxes along the transect. Both the magnitude and efficiency of the estimated POC export flux from the surface ocean varied spatially within our study region. Export fluxes of POC ranged from negligible to 10mmolCm -2 d -1 , with enhanced POC export in the Labrador Sea. The cruise track was characterized by overall low POC export relative to net primary production (export efficiency
Original languageEnglish
Pages (from-to)309-327
Number of pages19
JournalBiogeosciences
Volume16
Issue number2
DOIs
Publication statusPublished - 24 Jan 2019

Keywords

  • DISTRIBUTIONS
  • MESOSCALE
  • OCEAN
  • PB-210 ACTIVITIES
  • PHYTOPLANKTON
  • PO-210
  • POC EXPORT
  • SEA
  • SURFACE WATERS
  • TH-234

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