Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2022
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.952939 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867172225284571136 |
|---|---|
| author | Bruni, Elena T Blattmann, Thomas Michael Haghipour, Negar Louw, Deon C Lever, Mark A Eglinton, Timothy Ian |
| author_facet | Bruni, Elena T Blattmann, Thomas Michael Haghipour, Negar Louw, Deon C Lever, Mark A Eglinton, Timothy Ian |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The Benguela Upwelling System is situated between 18°S and 26°S and is characterized by seasonally variable upwelling cells, elevated surface primary and secondary productivity, high sedimentary organic carbon concentrations (up to 20 %), and locally stable bottom water anoxia. Between 2014 and 2019, surface sediment cores were collected, subsampled, and analysed using geochemical and sedimentological tools. For the grain size fractionation, a combined sieve-centrifuge-filtering approach was developed to create seven fractions (> 250, 250-200, 200-125, 125-63, 63-10, 10-2, ≤ 2.0 µm) and the density fractionation followed a centrifugation sequence to yield four fractions using sodium polytungstate (NaW) heavy liquid (≤ 1.6, 1.6-2.0, 2.0-2.5, > 2.5 g cm-3) (cf., Wakeham et al., 2009, https://doi.org/10.1016/j.marchem.2009.08.005). The bulk surface sediment and each fraction were analysed for TOC (%), radiocarbon age (F14C), and surface area (m2 g-1). Together with literature data, these samples are used to test and illustrate a novel hypothesis on sediment hydrodynamic properties in oxygen-depleted environments. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_952939 |
| institution | PANGAEA |
| language | en |
| publishDate | 2022 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sedimentary hydrodynamic processes under low-oxygen conditions: implications for past, present, and future oceans Bruni, Elena T Blattmann, Thomas Michael Haghipour, Negar Louw, Deon C Lever, Mark A Eglinton, Timothy Ian Benguela Upwelling System; density fractionation; grain size analysis; radiocarbon isotope (Fm); SLOB; Total Organic Carbon The Benguela Upwelling System is situated between 18°S and 26°S and is characterized by seasonally variable upwelling cells, elevated surface primary and secondary productivity, high sedimentary organic carbon concentrations (up to 20 %), and locally stable bottom water anoxia. Between 2014 and 2019, surface sediment cores were collected, subsampled, and analysed using geochemical and sedimentological tools. For the grain size fractionation, a combined sieve-centrifuge-filtering approach was developed to create seven fractions (> 250, 250-200, 200-125, 125-63, 63-10, 10-2, ≤ 2.0 µm) and the density fractionation followed a centrifugation sequence to yield four fractions using sodium polytungstate (NaW) heavy liquid (≤ 1.6, 1.6-2.0, 2.0-2.5, > 2.5 g cm-3) (cf., Wakeham et al., 2009, https://doi.org/10.1016/j.marchem.2009.08.005). The bulk surface sediment and each fraction were analysed for TOC (%), radiocarbon age (F14C), and surface area (m2 g-1). Together with literature data, these samples are used to test and illustrate a novel hypothesis on sediment hydrodynamic properties in oxygen-depleted environments. |
| title | Sedimentary hydrodynamic processes under low-oxygen conditions: implications for past, present, and future oceans |
| topic | Benguela Upwelling System; density fractionation; grain size analysis; radiocarbon isotope (Fm); SLOB; Total Organic Carbon |
| url | https://doi.org/10.1594/PANGAEA.952939 |