Publication Date:
2024-06-26
Description:
Porewater analyses from all M157 multicores and gravity cores are presented here. For each site, both shipboard and shore-based analyses are included. Shipboard analyses include photometric determination dissolved iron (Fe2+) and phosphate (PO43-) (Hach Lange DR 5000 photometer, 565 nm and 880 nm wavelengths), as well as ammonium (NH4+) via flow injection gas separator technique. Additional porewater aliquots were collected for analyses at MARUM between December 2019 and February 2020. Shore-based analyses completed in the Sediment Geochemistry Laboratory at MARUM include: ion chromatography (F-, Br-, Cl-, SO42-, NO3-, and PO43-), photometric determination of sulfide (wavelength 670 nm), DIC and NPOC (Analytik Jena Multi N/C Series), and inductively coupled plasma emission spectrometry (Al, B, Ba, Ca, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, P, S, Si, Sr, Ti, V). All data is over-specified for calculation purposes. Several constituents were below detection and therefore not reported here. These include: IC determined NO3-, and PO43- , ICP measurements of Cr, Cu, Mo, No, and V. Both depth in core (cm) and a corrected depth below seafloor (cm) are presented. Gravity core depths were adjusted to extend the porewater profiles from the paired multicore from the site. This offset was determined visually, based on eight constituent profiles. Most gravity cores were offset only by the length of the multicore, except for Site 14 with an additional 5cm, and Site 34 which an additional 10 cm was needed. Sites 10, 48 and 44 are only multicores, while Site 47 is only a gravity core. The data from site 48 was used to estimate an offset for the Site 47 gravity core due to their proximity.
Keywords:
Benguela Upwelling System; Center for Marine Environmental Sciences; EVAR; M157; MARUM; porewater; The Benguela Upwelling System under climate change – Effects of VARiability in physical forcing on carbon and oxygen budgets
Type:
Dataset
Format:
application/zip, 9 datasets
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