Thielecke, Antonia; Smith, Alexandra; Krause, Jeffrey W (2023): KOSMOS 2020 Peru mesocosm study on ecosystem responses to different light and upwelling intensities: biogenic silica concentrations from water samples [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.961209
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Abstract:
This data is part of the BMBF project CUSCO (Coastal Upwelling Systems in a Changing Ocean). Here we report biogenic Silica concentrations in the watercolumn collected during a 35-day experiment, where we enclosed natural plankton communities in in-situ mesocosms off Peru. The experiment investigated the interactive effects of light and upwelling on the Humboldt upwelling ecosystem by mimicking a gradient of upwelling intensities (0%, 15%, 30%, 45% and 60%) under summer-time high light and winter-time low light. Integrated seawater samples from a depth between 0 and 10m were collected using a 5L Integrating Water sampler (IWS; Hydro-Bios, Kiel). Samples (0.15-1L) were filtered onto polycarbonate filters (0.65 µm pore size, Whatman). The filters were then dried in the oven at 60 °C for 24 hours and measured following a modified procedure by DeMaster (1981, doi:10.1016/0016-7037(81)90006-5). A standard water bath (Fisher Scientific Isotemp Water Bath, Thermo Fisher Scientific, Waltham, US) was used to digest BSi samples at 85°C. The BSi analysis was carried out with a 4.5-hour time course alkaline digestion (0.1N Na2CO3) to dissolve the BSi followed by a 48 hour HF acid digestion (2.0M) to release the remaining lithogenic silica (LSi). Spectrophotometric analysis of the solubilized silica was done using a Thermo Scientific Genesys 10 UV- VIS Spectrophotometer (Thermo Fisher Scientific, Waltham, US). Model I linear regression was performed to calculate the concentrations of BSi while accounting for the amount of LSi that leached out during the alkaline digestion. Due to restrictions caused by the COVID-19 pandemic BSi data is only available for day 1 until day 17 and for day 31 until day 35.
Keyword(s):
Project(s):
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0813A: Küstennahe Auftriebsgebiete CUSCO: Auswirkungen geänderter Auftriebsintensitäten auf Struktur, Funktion und Produktivität pelagischer Nahrungsnetze im peruanischen Humboldt-Auftriebsgebiet
Horizon 2020 (H2020), grant/award no. 731065: Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean
Coverage:
Median Latitude: -12.055329 * Median Longitude: -77.235145 * South-bound Latitude: -12.056130 * West-bound Longitude: -77.235644 * North-bound Latitude: -12.054690 * East-bound Longitude: -77.234677
Date/Time Start: 2020-02-28T00:00:00 * Date/Time End: 2020-04-02T00:00:00
Event(s):
KOSMOS_2020_Mesocosm-M1 * Latitude: -12.054828 * Longitude: -77.235211 * Date/Time Start: 2020-02-28T00:00:00 * Date/Time End: 2020-04-02T00:00:00 * Campaign: KOSMOS_2020 (KOSMOS Peru) * Method/Device: Mesocosm experiment (MESO)
KOSMOS_2020_Mesocosm-M2 * Latitude: -12.054690 * Longitude: -77.234944 * Date/Time Start: 2020-02-28T00:00:00 * Date/Time End: 2020-04-02T00:00:00 * Campaign: KOSMOS_2020 (KOSMOS Peru) * Method/Device: Mesocosm experiment (MESO)
KOSMOS_2020_Mesocosm-M3 * Latitude: -12.054725 * Longitude: -77.234677 * Date/Time Start: 2020-02-28T00:00:00 * Date/Time End: 2020-04-02T00:00:00 * Campaign: KOSMOS_2020 (KOSMOS Peru) * Method/Device: Mesocosm experiment (MESO)
Comment:
Mesocosm 10 describes the control sample from the Pacific
values marked with #: analytically undetectable
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Type of study | Study type | Krause, Jeffrey W | |||
| 2 | Event label | Event | Krause, Jeffrey W | |||
| 3 | Mesocosm label | Meso label | Krause, Jeffrey W | |||
| 4 | DATE/TIME | Date/Time | Krause, Jeffrey W | Geocode | ||
| 5 | Day of experiment | DOE | day | Krause, Jeffrey W | ||
| 6 | Depth, water, experiment, top/minimum | Depth water exp top | m | Krause, Jeffrey W | ||
| 7 | Depth, water, experiment, bottom/maximum | Depth water exp max | m | Krause, Jeffrey W | ||
| 8 | Treatment: light condition | T:light | Krause, Jeffrey W | summer-time high light (HL) and winter-time low light (LL) | ||
| 9 | Treatment | Treat | Krause, Jeffrey W | upwelling intensity in % | ||
| 10 | Treatment | Treat | Krause, Jeffrey W | |||
| 11 | Biogenic silica | bSiO2 | µmol/l | Krause, Jeffrey W | Spectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10 | |
| 12 | Biogenic silica, standard deviation | bSiO2 std dev | ± | Krause, Jeffrey W | ||
| 13 | Lithogenic silica | LSi | µmol/l | Krause, Jeffrey W | Spectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10 | Na2CO3 leached LSi |
| 14 | Lithogenic silica | LSi | µmol/l | Krause, Jeffrey W | Spectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10 | HF digested LSi |
| 15 | Lithogenic silica | LSi | µmol/l | Krause, Jeffrey W | Spectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10 | total |
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1536 data points