Campaña: D361

The cruise D361 forms part of a study entitled 'Physical and chemical forcing of diazotrophy in the (sub)-tropical Atlantic Ocean'. The study is investigating the potential influence of iron and phosphorus availability on nitrogen fixation in regions of the tropical Atlantic Ocean. The cruise also undertakes deep trace metal clean CTD casts as part of the International GEOTRACES programme. The purpose of the cruise therefore is to undertake measurements of dissolved and particulate iron and phosporpus availability, their spatial and temporal variations, and their impact on diazotrophy in the surface ocean.

Aim: To quantify the supply and determine the biogeochemical cycling of Fe and other nutrients, and relate this to N2 fixation, diazotroph species distribution and N* fields.

1. Quantify the distribution of nutrients and trace metals: Quantify surface water and water column distributions of dissolved inorganic/organic N, P, Fe, and DAl, DMn and particulate P, N, Fe, Al, Mn.

2. Quantify the rate of Fe, Al, Mn, P and N supply to surface waters: Assess the source fluxes of the key elements for diazotrophs and source tracers to the surface ocean from atmospheric deposition and internal transport via diapycnal mixing and lateral advection.

3. Identify the source of subsurface Fe enrichment: Identify whether Fe-rich subsurface waters of the tropical North Atlantic thermocline originate from the atmosphere or the shelf using Fe distributions and Al, Mn, and O2 source tracers.

4. Quantify the diazotrophic response to Fe, phosphate, DOP supply: Relate the spatial distributions of inorganic Fe and organically complexed Fe, and phosphate and DOP to diazotrophy. The specific uptake of Fe, phosphate and DOP by the whole microbial community and Trichodesmium will be assessed by shipboard incubations, radiotracer techniques and enzyme bioassays. In addition, we will identify the connection between N2 fixation rates and diazotroph community structure, by comparing size fractionated 15N2-derived rates of N2 fixation (Fig. 1) with abundance and diversity of diazotrophs using nifH phylogeny.

Objective 5: Investigate how the large scale transport pathways of Fe and P influence the N* distribution: Use fine-scale isopycnic model to reveal the large-scale transport pathways of Fe and P in the (S)-T Atlantic, and their effect on the N* distribution.

 
Citation proposal
. Campaña: D361. http://datos.ieo.es/geonetwork/srv/api/records/urn:SDN:CSR:LOCAL:SI29201102070
 

Simple

Alternate title
Referencia IEO: 10570
Date ( Creation )
2011-03-19
Identifier
urn:SDN:CSR:LOCAL:10570

  Originator

  N/A  
Status
Completed

  Point of contact

  +44 (0)23 8059 3059 
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Oceanographic geographical features
Ten-degree Marsden Squares ( marsden_square )
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SeaDataNet Ports Gazetteer ( departure_place )
  • Santa Cruz de Tenerife
SeaDataNet Ports Gazetteer ( arrival_place )
  • Santa Cruz de Tenerife
International Standards Organisation countries ( departure_country )
  • Spain
International Standards Organisation countries ( arrival_country )
  • Spain
ICES Platform Codes ( platform )
  • Discovery
SeaVoX Platform Categories ( platform_class )
  • research vessel
SeaVoX salt and fresh water body gazetteer ( Place )
  • South Atlantic Ocean
SeaVoX salt and fresh water body gazetteer ( Place )
  • Northeast Atlantic Ocean (40W)
Use limitation
Not applicable
Access constraints
Restricted
Other constraints
Access constraints
Restricted
Other constraints
Metadata language
Spanish; Castilian
Character set
utf8 UTF8
Topic category
  • Oceans
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Begin date
2011-02-07T00:00:00Z
End date
2011-03-19T00:00:00Z
Reference system identifier
World Geodetic System 84

 

Alternate title
L10
Date ( Revision )
2011-03-03
Edition
3
Identifier
https://www.seadatanet.org/urnurl/SDN:L10

Distribution format
  • XML (1 )

OnLine resource
Base de datos internacional con información de campañas desde 1873 hasta la actualidad. La presente campaña la podrás encontrar como D361.  

SeaDataNet - CRS inventory

OnLine resource
Descubre si hay datos de esta campaña disponibles, utilizando para ello la etiqueta D361 en el buscador de datos de SeaDataNet.  

SeaDataNet - CDI inventory

Hierarchy level
Campaña/Survey Series

Conformance result

Date ( Publication )
2010-12-08
Explanation
See the referenced specification
Pass
true

Conformance result

Date ( Publication )
2010-12-08
Explanation
See the referenced specification
Pass
true
Statement
El Centro de datos aplica controles de calidad estandarizados a todos los datos de los que es responsable. Contacta con el Centro de datos para más información.

gmd:MD_Metadata

File identifier
urn:SDN:CSR:LOCAL:SI29201102070   XML
Metadata language
Spanish; Castilian
Character set
utf8 UTF8
Hierarchy level
Campaña/Survey Series
Hierarchy level name
Cruise Summary record
Date stamp
2021-11-29
Metadata standard name
ISO 19115/SeaDataNet profile
Metadata standard version
1.0

  Point of contact

  N/A  
 
 

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