Citation:

2017GB005868

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Abstract:

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.

Coverage:

Median Latitude: 33.338812 * Median Longitude: -41.439801 * South-bound Latitude: 20.883500 * West-bound Longitude: -64.681500 * North-bound Latitude: 41.571170 * East-bound Longitude: -14.733670

Date/Time Start: 2011-03-25T16:08:00 * Date/Time End: 2011-04-08T10:25:00

Minimum DEPTH, water: 4.5 m * Maximum DEPTH, water: 5366.4 m

Event(s):

BEO2011_01 * Latitude: 20.883500 * Longitude: -64.681500 * Date/Time: 2011-03-25T14:35:00 * Elevation: -5215.0 m * Location: South Atlantic Ocean * Campaign: (Malaspina cruise) * Basis: Sarmiento de Gamboa * Method/Device: (CTD-RO)

BEO2011_02 * Latitude: 22.406000 * Longitude: -62.479500 * Date/Time: 2011-03-26T08:05:00 * Elevation: -5822.0 m * Location: South Atlantic Ocean * Campaign: (Malaspina cruise) * Basis: Sarmiento de Gamboa * Method/Device: (CTD-RO)

BEO2011_03 * Latitude: 24.432670 * Longitude: -59.433000 * Date/Time: 2011-03-27T07:02:00 * Elevation: -5948.0 m * Location: South Atlantic Ocean * Campaign: (Malaspina cruise) * Basis: Sarmiento de Gamboa * Method/Device: (CTD-RO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		Vidal, Montserrat
2	DATE/TIME	Date/Time		Vidal, Montserrat	Geocode
3	Latitude of event	Latitude		Vidal, Montserrat
4	Longitude of event	Longitude		Vidal, Montserrat
5	Elevation of event	Elevation	m	Vidal, Montserrat
6	Ocean and sea region	OS region		Vidal, Montserrat
7	DEPTH, water	Depth water	m	Vidal, Montserrat	Geocode
8	Temperature, water	Temp	°C	Vidal, Montserrat	ITS-90
9	Salinity	Sal		Vidal, Montserrat	PSU
10	Density, sigma-theta (0)	Sigma-theta	kg/m³	Vidal, Montserrat
11	Oxygen	O2	µmol/l	Vidal, Montserrat
12	Fluorometer	Fluorometer	arbitrary units	Vidal, Montserrat
13	Nitrate and Nitrite	[NO3]- + [NO2]-	µmol/l	Vidal, Montserrat
14	Phosphorus, reactive soluble	SRP	µmol/l	Vidal, Montserrat
15	Nitrogen, organic, total	TON	µmol/l	Vidal, Montserrat
16	Phosphorus, organic, total	TOP	µmol/l	Vidal, Montserrat

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

3145 data points

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