Details of CTD, Disko west cruise 2009

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Dataset identification

Title of datasetCTD, Disko west cruise 2009
Narrative summary of datasetIn September 2009, a ship-based study was carried out in the Davis Strait/southern Baffin Bay along a range of transects covering the area between the west coast of Greenland and Baffin Island (Canada) from 68-72º N . Water temperature, salinity and in situ chlorophyll a (chl. a) measured in 0-500 m depths followed the general hydrographical characteristics of the late summer situation. Surface chl. a concentration based on remote sensing satellite data from September 2009 supported these findings. Measurement of in situ chl. a concentrations revealed a maximum in the subsurface (30-50 m water depths). Thus, spatial distribution of the phytoplankton bloom was often restricted to subsurface rather than the surface waters and therefore not detected by the remote sensing during September.
Project/programmeVertical and horizontal distribution of zooplankton and polar cod in southern Baffin Bay (66–71degrees N) in September 2009
Start date2009-09-07
End date2009-09-22

Responsible organisations

CountryDenmark
Organisation nameAarhus University,Danish Centre for Environment and Energy
Role of organisationOriginator of Dataset

Dataset availability

Original dataset download linkhttps://cloud.emodnet-ingestion.eu/index.php/s/ZFcv057v553nJ0t
Dataset formatDelimited
Text or Plaintext
Public accessNo limitations
License for useODC-By
TypeDataset

Locations

Map
Latitude north boundary71
Longitude east boundary-50.458813491341
Latitude south boundary66.3
Longitude west boundary-70.849438491341
Coordinate reference systemWorld Geodetic System 84
Sea areaArctic Ocean
Baffin Bay
Davis Strait

Data types, collection and processing

Observation typeOther physical oceanographic measurements
Water column temperature and salinity
ParameterVariable fluorescence parameters
Chlorophyll pigment concentrations in water bodies
Salinity of the water column
Temperature of the water column
Instrument typefluorometers
Instrument nameSeapoint chlorophyll fluorometer
Instrument typeCTD
Instrument nameSea-Bird SBE 911plus CTD
Platform typeresearch vessel
Platform nameBjarni Saemundsson
Data quality processing informationOn the basis of the CTD stations, five transects cutting across the main bathymetrical and hydrographical structures of the study area were defined (Fig. 1) and interpolated for salinity, temperature, and fluorescence, respectively (Fig. 2). Transects 1-4 cut across the entire study area, starting in CSW, moving through DB, and ending in GSW. Transect 5 is located mainly in GSW, with only one station in DB (Fig. 1). All transects were characterized by relatively warm water (2.2 °C) in the upper water column (0-50 m) (Fig. 2a, d, g, j, m). In CSW, the intermediate water body (50-250 m) consisted of relatively cold water (-1.4 °C), which stretched out eastwards into the upper part of the intermediate water body in DB. In GSW, the intermediate water body was relatively warm (2.3 °C). The deeper part of the water body (250–500 m) was relatively warm in all three areas (2.1 °C) with a gradual increase in temperature from CSW toward GSW. On all transects, the salinity ranged from 30.5 to 34.5, increasing with depth. The salinity was in general lowest in the surface waters (0–50 m) of the CSW and highest at depth (300–500 m) in the GSW (Fig. 2b, e, h, k, n), the latter as a result of the inflow of warm Atlantic water. At any particular depth, salinity always increased toward east. Fluorescent material was only found in the upper 50 m of the water column with slightly higher values in CSW and GSW(0.9) than inDB(0.6) (Fig. 2c, f, i, l, o). St. 1 located on the shallow St. Hellefiskebanke (GSW), which is renowned for its primary production, had the highest fluorescence levels recorded in the study area. However, if st. 1 is excluded, there were significantly higher levels of fluorescent material in CSW than in GSW (p[0.0001, t test).

Process information

Submitting organisationAarhus University, Department of Bioscience, Marine Ecology Roskilde
Submission identifier (UUID)267aaf37-c3a8-406a-8492-761953fb13dd
Date of dataset creation2009-09-22
Date of metadata creation2019-03-26
Date of metadata latest revision2019-05-22
Date of publishing2019-05-24
Processing data centreAarhus University, Department of Bioscience, Marine Ecology Roskilde
Summary record-ID515