Rixen, Tim; Siddiqui, Claire (2023): Underway data on pCO2, total alkalinity, temperature, salinity, wind speed and air pressure in the Benguela Upwelling System during TRAFFIC and GENUS cruises [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.957810, In: Rixen, T; Siddiqui, C (2023): Biogeochemical measurements of the sea surface and water column in the Benguela Upwelling System during TRAFFIC and GENUS cruises [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.957900
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Abstract:
As part of the BMBF funded project TRAFFIC (Trophic Transfer Efficiency in the Benguela Current) and GENUS (Geochemistry and Ecology of the Namibian Upwelling System), the mole fraction of CO2 (xCO2) was measured in surface waters by using an underway pCO2 system (SUNDANS) during eight cruises. SUNDANS was developed by marine analytics and data (MARIANDA, Germany, www.marianda.com) according to the recommendations of the 2002 underway pCO2 system workshop in Miami. It was equipped with a shower type equilibrator, an open pre-equilibrator and a non-dispersive dual cell infrared gas analyzer (LI-7000). The LI-7000 was calibrated by using nitrogen gas (zero CO2) and a two additional standard gas for CO2. The standard gases were obtained from the company Deuste Steininger GmbH, Germany and revealed CO2 concentrations of 350 to 480 ppm (Std1) and around 800 ppm (Std2). The CO2 standard gases were calibrated against the standard gases provided by NOAA at the Institute for Baltic Sea Research in Warnemünde, Germany and the Leibniz Centre for Tropical Marine Research in Bremen, Germany. The xCO2 data were recorded each 6 seconds and subsequently averaged minute by minute. Minute by minute data on atmospheric pressure (Digital Barometer PTB220, Vaisala), wind speed (Ultrasonic Anemometer 2D, Thies), seawater temperature (Digital Oceanographic Thermometer SBE38, Sea-Bird Electronics, inc.) and salinity (Thermosalinograph SBE21 Seacat, Sea-Bird Electronics, inc.) were measured by underway systems mounted on board the research vessels (Data provided by the Federal Maritime and Hydrographic Agency, access under http://dship.bsh.de/). xCO2 was converted into pCO2 by using the CO2sys programme. The difference between the equilibrator and the sea water temperature was taken into account as suggested by Dickson et al. (2007, SOP5, page 8). Additional measurements on total alkalinity were carried out during SO285 using the VINDTA 2S system (MARIANDA, Germany, www.marianda.com). The samples were titrated with a fixed volume of hydrochloric acid (HCl) by equal increments of HCl (0.1 N HCl). The VINDATA 2S system was calibrated using Certified Reference Material provided by A. Dickson (Scripps Institution of Oceanography, La Jolla, CA, USA).
Keyword(s):
Supplement to:
Siddiqui, Claire; Rixen, Tim; Lahajnar, Niko; van der Plas, Anja K; Louw, Deon C; Lamont, Tarron; Pillay, Keshnee (2023): Regional and global impact of CO2 uptake in the Benguela Upwelling System through preformed nutrients. Nature Communications, 14(1), 2582, https://doi.org/10.1038/s41467-023-38208-y
Source:
Federal Maritime and Hydrographic Agency (2023): DSHIP Landsystem. http://dship.bsh.de/
Project(s):
Funding:
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03F0650: Geochemistry and ecology of the Namibian upwelling system
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03F0797A: Trophic Transfer Efficiency in the Benguela Current
Coverage:
Median Latitude: -13.528698 * Median Longitude: 11.422740 * South-bound Latitude: -26.761160 * West-bound Longitude: -25.103670 * North-bound Latitude: 44.538928 * East-bound Longitude: 54.486830
Date/Time Start: 2013-07-31T11:12:00 * Date/Time End: 2021-10-20T03:47:00
Minimum DEPTH, water: 7 m * Maximum DEPTH, water: 7 m
Event(s):
M99_0_underway-1 * Latitude Start: -23.461650 * Longitude Start: 14.166820 * Latitude End: -22.409780 * Longitude End: 13.710610 * Date/Time Start: 2013-07-31T11:12:00 * Date/Time End: 2013-08-20T08:26:00 * Campaign: M99 * Basis: Meteor (1986) * Method/Device: Multiple investigations (MULT) * Comment: event was not logged in DSHIP
M100/1_0_underway-1 * Latitude Start: -22.892938 * Longitude Start: 14.410137 * Latitude End: -21.656826 * Longitude End: 12.975790 * Date/Time Start: 2013-09-01T06:40:00 * Date/Time End: 2013-09-29T18:00:00 * Campaign: M100/1 * Basis: Meteor (1986) * Method/Device: Multiple investigations (MULT) * Comment: event was not logged in DSHIP
M100/2_0_underway-1 * Latitude Start: -23.285070 * Longitude Start: 13.795190 * Latitude End: -21.088710 * Longitude End: 54.486830 * Date/Time Start: 2013-10-04T12:06:00 * Date/Time End: 2013-10-20T04:08:00 * Campaign: M100/2 * Basis: Meteor (1986) * Method/Device: Multiple investigations (MULT) * Comment: event was not logged in DSHIP
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | Rixen, Tim | |||
2 | Date/Time of event | Date/Time | Rixen, Tim | |||
3 | Latitude of event | Latitude | Rixen, Tim | |||
4 | Longitude of event | Longitude | Rixen, Tim | |||
5 | DEPTH, water | Depth water | m | Rixen, Tim | Geocode | |
6 | Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) | pCO2water_SST_wet | µatm | Rixen, Tim | Calculated using CO2SYS | |
7 | Temperature, water | Temp | °C | Rixen, Tim | Thermosalinograph Seacat SBE-21 system with SBE 38 | |
8 | Salinity | Sal | Rixen, Tim | Thermosalinograph Seacat SBE-21 system with SBE 38 | PSU | |
9 | Pressure, atmospheric | PPPP | hPa | Rixen, Tim | Barometer PTB220, Vaisala | |
10 | Wind speed | ff | m/s | Rixen, Tim | Ultrasonic Anemometer 2D, Thies Clima | |
11 | Alkalinity, total | AT | µmol/kg | Rixen, Tim | Coulometric titration, Marianda, VINDTA 2S |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 4 (ProcLevel4)
Size:
838788 data points
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