Hydrochemistry measured on water bottle samples during Sarmiento de Gamboa BEO 2011 cruise

DOI

The ability of the subtropical North Atlantic to sustain export production despite the lack of available nutrients is fascinating. Subtropical gyres are expected to expand under a global warming scenario, so it is important to understand the mechanisms supplying the required nutrients. Current issues for the region concern the nutrient and metabolic balance, the origin of excess nitrogen and phosphorus shortage, and the maintenance of nitrogen fixation. We report data on the allocation of nitrogen and phosphorus in dissolved and suspended pools, the isotopic δ15N of suspended nitrogen, and the lability of dissolved organic phosphorus (DOP) along a section crossing the eastern seasonally stratified North Atlantic (SSNA) and the western subtropical North Atlantic (NASW). We find extreme P-deficiency in the NASW, with the highest dissolved inorganic N:P ratios located within the upper-thermocline isopycnals (σϴ = 26.3-26.8). Our data indicate an important role of the mid-latitude northeast SSNA bringing dissolved organic matter (DOM) to the thermocline of the North Atlantic. The mineralisation of N-rich DOM contributes to the N excess (P deficit) of the upper-thermocline of NASW. We find lower concentrations of more reactive DOP in the western than in the eastern part of the transect, indicating an active role of DOP in the nutrition of microbial communities. Our results support recent hypotheses concerning the environmental controls of marine nitrogen fixation identifying the key role of DOP utilisation.

Supplement to: Vidal, Montserrat; Aspillaga, Eneko; Teixidor-Toneu, Irene; Delgado-Huertas, Antonio (2018): Lateral Transport of N-Rich Dissolved Organic Matter Strengthens Phosphorus Deficiency in Western Subtropical North Atlantic. Global Biogeochemical Cycles, 32

Identifier
DOI https://doi.org/10.1594/PANGAEA.868928
Related Identifier IsSupplementTo https://doi.org/10.1029/2017GB005868
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.868928
Provenance
Creator Vidal, Montserrat ORCID logo; Aspillaga, Eneko ORCID logo; Teixidor-Toneu, Irene ORCID logo; Delgado-Huertas, Antonio ORCID logo
Publisher PANGAEA
Publication Year 2016
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 3145 data points
Discipline Earth System Research
Spatial Coverage (-64.681W, 20.884S, -14.734E, 41.571N); North Atlantic Ocean
Temporal Coverage Begin 2011-03-25T16:08:00Z
Temporal Coverage End 2011-04-08T10:25:00Z