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  • 1
    Publication Date: 2023-05-03
    Description: The dataset compiles in situ observational data obtained during the PHYTO-FRONT cruise (2014-02-03 - 2014-02-07) of central-southern Chile. The data includes conductivity, temperature, depth and potential density. Nutrient data, total and size-fractionated chlorophyll a measurements and data from plankton samples for composition and abundance of the micro-phytoplankton (microdiatoms) size fraction are also included.
    Keywords: central-southern Chile; Macro-nutrients; microdiatoms abundance; Physical oceanographic data; total and size-fractionated chlorophyll-a
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 2
    Publication Date: 2023-05-03
    Description: Conductivity, temperature and depth (CTD) data, and also potential density obtained from the temperature and salinity down-cast profiles using the TEOS-10 subroutines of the Gibbs-Sea Water oceanographic toolbox.
    Keywords: central-southern Chile; CTD, Sea-Bird, SBE 19plus; Density, potential; DEPTH, water; Event label; Latitude of event; Longitude of event; Macro-nutrients; microdiatoms abundance; MULT; Multiple investigations; north-transect_station12; north-transect_station13; north-transect_station14; north-transect_station15; north-transect_station16; north-transect_station17; north-transect_station18; north-transect_station19; north-transect_station20; north-transect_station21; north-transect_station22; north-transect_station23; north-transect_station24; north-transect_station25; Physical oceanographic data; PHYTO-FRONT; Salinity; South Pacific; south-transect_station1; south-transect_station10; south-transect_station11; south-transect_station2; south-transect_station3; south-transect_station4; south-transect_station5; south-transect_station6; south-transect_station7; south-transect_station8; south-transect_station9; Temperature, water; total and size-fractionated chlorophyll-a
    Type: Dataset
    Format: text/tab-separated-values, 36165 data points
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  • 3
    Publication Date: 2024-03-22
    Description: The Cape Verde Frontal Zone (CVFZ) is a highly dynamic region located in the southern boundary of the Canary Current Eastern Boundary Upwelling Ecosystem. Due to the interaction of the Cape Verde Front with the Mauritanian coastal upwelling, the area features large vertical and horizontal export fluxes of organic matter. Full-depth profiles were recorded during FLUXES I cruise, with four consecutive transects defining a box embracing the giant filament of Cape Blanc and the Cape Verde front. Fifteen levels were sampled in medium and long stations (down to 4000 dbar) and 10 levels in short stations (down to 2000 dbar) where inorganic nutrients (NO3, NO2, Si(OH)4 and PO4), dissolved organic carbon/total dissolved nitrogen (DOC/TDN), and suspended particulate organic carbon and nitrogen (POC and PON) were sampled. Micromolar concentrations of nutrient salts were determined simultaneously by segmented flow analysis in an Alliance Futura autoanalyser. The determination of suspended POC and PON was carried out by high temperature catalytic oxidation at 900 °C in a Perkin Elmer 2400 elemental analyser. DOC and TDN were analysed by high temperature catalytic oxidation at 680 °C with a Shimadzu TOC-V analyser connected in line with a TNM1 measuring unit. Alongside with water samples conductivity, temperature and depth (CTD; SeaBird SBE911 plus), and dissolved oxygen (SeaBird SBE43), fluorescence of chlorophyll (SeaPoint SCF), and turbidity (SeaPoint STM) were measured. CTD conductivity was calibrated with water samples taken from the rosette and analysed on board with a Guildline 8410-A Portasal salinometer. Samples for dissolved oxygen (O2) determination were analysed on board by the Winkler potentiometric method. The chlorophyll (Chl) fluorescence sensor was calibrated with water samples taken at 4 depths in the photic layer which were estimated fluorometrically by means of a Turner Designs bench fluorometer 10-AU.
    Keywords: 29SG20170711; 29SG20170711_10-1; 29SG20170711_1-1; 29SG20170711_11-1; 29SG20170711_12-1; 29SG20170711_13-1; 29SG20170711_14-1; 29SG20170711_15-1; 29SG20170711_16-1; 29SG20170711_17-1; 29SG20170711_18-1; 29SG20170711_19-1; 29SG20170711_20-1; 29SG20170711_2-1; 29SG20170711_21-1; 29SG20170711_22-1; 29SG20170711_23-1; 29SG20170711_24-1; 29SG20170711_25-1; 29SG20170711_26-1; 29SG20170711_27-1; 29SG20170711_28-1; 29SG20170711_29-1; 29SG20170711_30-1; 29SG20170711_3-1; 29SG20170711_31-1; 29SG20170711_32-1; 29SG20170711_33-1; 29SG20170711_34-1; 29SG20170711_35-1; 29SG20170711_4-1; 29SG20170711_5-1; 29SG20170711_6-1; 29SG20170711_7-1; 29SG20170711_8-1; 29SG20170711_9-1; Biogeochemical impact of mesoscale and sub-mesoscale processes along the life history of cyclonic and anticyclonic eddies: plankton variability and productivity; Bottle number; Campaign; Cape Verde Frontal Zone; Carbon, organic, dissolved; Carbon, organic, particulate; Carbon cycling; Cast number; Chlorophyll fluorometer, Seapoint, Seapoint chlorophyll fluorometer; Constraining organic carbon fluxes in an eastern boundary upwelling ecosystem (NW Africa): the role of non-sinking carbon in the context of the biological pump; Cruise/expedition; CTD, Sea-Bird, SBE43; CTD, Sea-Bird SBE 911plus; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Dissolved Organic Matter; e-IMPACT; Elemental analyzer, Perkin Elmer, 2400; Event label; Fluorescence, chlorophyll; FLUXES; FLUXES I; LATITUDE; LONGITUDE; Nitrate; Nitrite; Nitrogen, organic, particulate; Nitrogen, total dissolved; nitrogen cycling; Oxygen; particulate organic matter; Phosphate; Pressure, water; Quality flag, carbon, organic, dissolved; Quality flag, carbon, organic, particulate; Quality flag, fluorescence, chlorophyll; Quality flag, nitrate; Quality flag, nitrite; Quality flag, nitrogen, organic, particulate; Quality flag, nitrogen, total dissolved; Quality flag, oxygen; Quality flag, phosphate; Quality flag, salinity; Quality flag, silicic acid; Salinity; Sarmiento de Gamboa; Segmented flow analyzer (Alliance Futura); Shimadzu TOC-V CSH total organic carbon analyzer coupled to TNM-1 nitrogen analyzer; Silicic acid; Station label; SUMMER; Sustainable Management of Mesopelagic Resources; Temperature, water; water masses; Winkler potentiometric after Langdon (2010)
    Type: Dataset
    Format: text/tab-separated-values, 12905 data points
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  • 4
    Publication Date: 2024-04-15
    Description: This dataset contains total and size-fractionated chlorophyll a samples in the micro-, nano- and pico-phytoplankton range collected in the upper layer (0, 5, 10, 15, 20, 30, and 40 m depth).
    Keywords: Bottle, Niskin 8-L; central-southern Chile; Chlorophyll a; Chlorophyll a microplankton; Chlorophyll a nanoplankton; Chlorophyll a picoplankton; DEPTH, water; Event label; LATITUDE; LONGITUDE; Macro-nutrients; microdiatoms abundance; MULT; Multiple investigations; NIS_8L; north-transect_station12; north-transect_station14; north-transect_station16; north-transect_station18; north-transect_station20; north-transect_station22; north-transect_station24; north-transect_station25; north-transect_station26; Physical oceanographic data; PHYTO-FRONT; South Pacific; south-transect_station1; south-transect_station10; south-transect_station11; south-transect_station2; south-transect_station3; south-transect_station4; south-transect_station5; south-transect_station6; south-transect_station7; south-transect_station8; south-transect_station9; total and size-fractionated chlorophyll-a
    Type: Dataset
    Format: text/tab-separated-values, 488 data points
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  • 5
    Publication Date: 2024-04-15
    Description: This dataset contains plankton samples collected with Niskin bottles in the upper layer (0, 5, 10, 15, 20, 30, and 40 m depth) for composition and abundance of the micro-phytoplankton (microdiatoms) size fraction.
    Keywords: Bottle, Niskin 8-L; central-southern Chile; Chaetoceros debilis; DEPTH, water; Diatoms; Event label; LATITUDE; LONGITUDE; Macro-nutrients; microdiatoms abundance; MULT; Multiple investigations; NIS_8L; north-transect_station12; north-transect_station14; north-transect_station16; north-transect_station18; north-transect_station20; north-transect_station22; north-transect_station24; north-transect_station25; north-transect_station26; Physical oceanographic data; PHYTO-FRONT; Pseudo-nitzschia pseudodelicatissima; South Pacific; south-transect_station1; south-transect_station10; south-transect_station11; south-transect_station2; south-transect_station3; south-transect_station4; south-transect_station5; south-transect_station6; south-transect_station7; south-transect_station8; south-transect_station9; total and size-fractionated chlorophyll-a
    Type: Dataset
    Format: text/tab-separated-values, 420 data points
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  • 6
    Publication Date: 2024-04-15
    Description: This dataset contains nutrient measurements (nitrate, phosphate and silicate) from samples collected with Niskin bottles in the upper layer (0, 5, 10, 15, 20, 30, and 40 m depth).
    Keywords: Bottle, Niskin 8-L; central-southern Chile; DEPTH, water; Event label; LATITUDE; LONGITUDE; Macro-nutrients; microdiatoms abundance; MULT; Multiple investigations; NIS_8L; Nitrate; north-transect_station12; north-transect_station14; north-transect_station16; north-transect_station18; north-transect_station20; north-transect_station22; north-transect_station24; north-transect_station25; north-transect_station26; Phosphate; Physical oceanographic data; PHYTO-FRONT; Silicate; South Pacific; south-transect_station1; south-transect_station10; south-transect_station11; south-transect_station2; south-transect_station3; south-transect_station4; south-transect_station5; south-transect_station6; south-transect_station7; south-transect_station8; south-transect_station9; total and size-fractionated chlorophyll-a
    Type: Dataset
    Format: text/tab-separated-values, 420 data points
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  • 7
  • 8
    Publication Date: 2020-04-24
    Description: The circulation patterns and the impact of the lateral export of nutrients and organic matter off NW Africa are examined by applying an inverse model to two hydrographic datasets gathered in fall 2002 and spring 2003. These estimates show significant changes in the circulation patterns at central levels from fall to spring, particularly in the southern boundary of the domain related to zonal shifts of the Cape Verde Frontal Zone. Southward transports at the surface and central levels at 26∘ N are 5.6±1.9 Sv in fall and increase to 6.7±1.6 Sv in spring; westward transports at 26∘ W are 6.0±1.8 Sv in fall and weaken to 4.0±1.8 Sv in spring. At 21∘ N a remarkable temporal variability is obtained, with a northward mass transport of 4.4±1.5 Sv in fall and a southward transport of 5.2±1.6 Sv in spring. At intermediate levels important spatiotemporal differences are also observed, and it must be highlighted that a northward net mass transport of 2.0±1.9 Sv is obtained in fall at both the south and north transects. The variability in the circulation patterns is also reflected in lateral transports of inorganic nutrients (SiO2, NO3, PO4) and dissolved organic carbon (DOC). Hence, in fall the area acts as a sink of inorganic nutrients and a source of DOC, while in spring it reverses to a source of inorganic nutrients and a sink of DOC. A comparison between nutrient fluxes from both in situ observations and numerical modeling output is finally addressed.
    Print ISSN: 1812-0784
    Electronic ISSN: 1812-0792
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 9
  • 10
    Publication Date: 2019-03-27
    Description: The upwelling system off the southern Caribbean coast is probably the main nutrients source that support the biological productivity in this oligotrophic sea. The Subtropical Water Mass (SUW) that forms the subsurface salinity maximum in the Caribbean is the main source of upwelled waters in this system. Salinity and temperature vs. depth profiles from 4 oceanographic cruises in the western sector of the Caribbean upwelling system, showed that the salinity of upwelled SUW waters is ~ 0.2 g kg−1 lower than the SUW salinity in the central Caribbean and have a slight seasonal variation that agree with with the rainy/dry seasons in the region. Besides, the depth of these SUW waters in the continental slope (~ 100 m) is ~ 50 m shallower than the SUW depth in the rest of the Caribbean sea. The origin of these modified SUW waters was analyzed using the Mercator numerical model, which reproduces the main vertical characteristics of the subsurface salinity maximum. Modeled data showed that SUW waters upwelled off La Guajira peninsula come from the western Caribbean and arrive to the system transported by an intense Caribbean Coastal Undercurrent (CaCU, mean speed ~ 0.4 m s−1). The lower salinity observed in the upwelled SUW waters may be the result of intense vertical mixing processes with diluted surface waters in the Panama-Colombia gyro that could occur when the CaCU flows below this region before reaching the upwelling zones. The mixing processes in the SUW by double diffusion and mechanical turbulence driven by vertical shear of horizontal currents, were analyzed using the Turner angle and the Thorpe scale, respectively. Double diffusion by salt fingers was found between the SUW and the Central North Atlantic Waters (NACW) with diffusivity values ~ 10−5 m2 s−1. But the mechanical diffusivity was two orders of magnitude higher (10−3 m2 s−1.) than the double diffusivities in the entire water column, generating salt fluxes from the SUW towards surface and towards depth over 2 g kg−1 m d−1. Beyond modifying the salt content in coastal SUW waters, these mixing processes may also alter the nutrient content of upwelling waters, with effects still unknown to the upwelling ecosystem.
    Print ISSN: 1812-0806
    Electronic ISSN: 1812-0822
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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