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RV Pelagia PE108

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Pelagia (64PE)
Cruise identifierPE108
Cruise period1997-06-23 — 1997-07-14
StatusCompleted
Port of departureHet Horntje, Netherlands
Port of returnVigo, Spain
ObjectivesOMEX II - leg 1
Benthic Biology of the Iberian Upwelling Margin. This cruise is a pilot study with the primary aim to make an extensive survey of the sea floor topography and the benthos prior to any detailed local sampling and in-situ measurements in later cruises.

Objectives:
1. To investigate the existence of depocentres of labile organics on the Iberian margin, measure their importance in terms of carbon assimilation (by in-situ SCOC and growth measurements), and attempt to trace the sources fuelling them (phytopigment analyses).
2. To investigate the coupling between the responses of benthic communities and the fluxes of carbon in the OMEX area.
3. Use video and Agassiz trawl surveys help to plan benthic sampling.

Narrative:
Sampling planned along 3 transects and compare data with those of Omex-I (only 2 transects with sediment sampling). A seismic survey was made of each transect with a 3.5Kc echosounder to locate sampling locations. A video-Agassiz trawl was used to map the megafauna and the small-scale topography of the sea-floor. At each trawling station a CTD profile of the water column was made and samples of near-bottom water were taken. Sediment samples were colllected with a box- or multi-corer for the analysis of: macrofauna, meiofauna, mesofauna, phytopigments, nucleic acids, C/N and porosity. Phytopigments in the near-bottom water and surface sediment samples used as biomarkers for quality and origin of the phytodetritus. Preliminary measurements of SCOC in shipboard incubated cores of 30cm diameter were made.
Chief scientistGerard C A Duineveld (Royal Netherlands Institute for Sea Research)
ProjectOMEX II
Cruise reportRV Pelagia PE108 cruise report pelagia108.pdf (4.58 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRV Pelagia PE108 cruise track — pelagia108trk.pdf (0.08 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: number of profiles = 13
Description: A number of CTD casts were made throughout the cruise. No. of casts not noted.
Biology and fisheries 
CrustaceansQuantity: number of hauls = 12
Description: video-Agassiz trawls made throughout the cruise, a number of shrimp and Galathea's were caught
Other biological/fisheries measurementQuantity: number of hauls = 12
Description: video-Agassiz trawls made throughout the cruise, a number of shrimp and Galathea's were caught
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 84
Description: 16 multi-cores and 68 box-cores
Multi-beam echosoundingQuantity: number of profiles = 23
Description: echo-sounder profiles made before each station
Data held at BODC Get data
Discrete samples 
44  Box corePhaeopigment concentrations in sediment
Zoobenthos dry weight biomass
Zoobenthos generic abundance
Sediment water content, porosity and surface area
Zoobenthos taxonomy-related wet weight biomass per unit area of the bed
Insect and earthworm taxonomy-related abundance per unit area of the bed
Other fluxes between the bed and the water column
Carbon concentrations in sediment
Chlorophyll pigment concentrations in sediment
Sediment grain size parameters
Nitrogen concentrations in sediment
Zoobenthos taxonomic abundance
13  CTD frame plus rosette samplerTemperature of the water column
Dissolved oxygen parameters in the water column
Density of the water column
Transmittance and attenuance of the water column
Chlorophyll pigment concentrations in water bodies
Salinity of the water column
12  Epibenthic SledgeZoobenthos taxonomy-related wet weight biomass per unit area of the bed
Zoobenthos taxonomic abundance
7  MulticorerPhaeopigment concentrations in sediment
Zoobenthos dry weight biomass
Sediment water content, porosity and surface area
Insect and earthworm taxonomy-related abundance per unit area of the bed
Carbon concentrations in sediment
Chlorophyll pigment concentrations in sediment
Sediment grain size parameters
Nitrogen concentrations in sediment
Zoobenthos taxonomic abundance