Schmaljohann, Rolf; Piker, Levent; Imhoff, Johannes F (1998): (Table 2) Hydrogen sulphide and methane content, and loss on ignition in sediments obtained in the Gotland Deep, Baltic Sea [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.785511, Supplement to: Schmaljohann, R et al. (1998): The distribution of methane and hydrogen sulfide in basin sediments of the central and southern Baltic Sea. Meyniana, 50, 191-211, https://doi.org/10.2312/meyniana.1998.50.191
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Abstract:
The distribution of methane and hydrogen sulfide concentrations in sediments of various basins of the Baltic Sea was investigated during 4 cruises in 1995 and 1996. Significant differences in the concentrations of both compounds were recorded between the basins and also between different areas within the Gotland Deep. High-methane sediments with distinctly increasing concentrations from the surface to deeper layers were distinguished from low-methane sediments without a clear gradient. Methane concentrations exhibited a fair correlation with the sediment accumulation rate, determined by measuring the total thickness of the post-Ancylus Holocene sequence on echosounding profiles in the Gotland Deep. Only weak correlations were observed with the content of organic matter in the surface layers of the sediments. Hydrogen sulfide concentrations in the sediments showed a positive correlation with methane concentrations, but, in contrast to methane concentrations, were strongly influenced by the transition from oxic to anoxic conditions in the water column between 1995 and 1996. Sediments in the deepest part of the Gotland Basin (>237 m water depth), covering an area of approximately 35 km**2, were characterized by especially high accumulation rates (>70 cm/ka) and high methane and hydrogen sulfide contents. Concentrations of these compounds decreased rapidly towards the slope of the basin.
Coverage:
Median Latitude: 57.317433 * Median Longitude: 20.093100 * South-bound Latitude: 57.308300 * West-bound Longitude: 20.049300 * North-bound Latitude: 57.335700 * East-bound Longitude: 20.115000
Date/Time Start: 1996-01-01T00:00:00 * Date/Time End: 1996-01-01T00:00:00
Minimum DEPTH, sediment/rock: 0.025 m * Maximum DEPTH, sediment/rock: 0.425 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Lemke, Wolfram | |||
| 3 | Direction | Direction | Lemke, Wolfram | of distance from station AL93 | ||
| 4 | Distance | Distance | km | Lemke, Wolfram | from station AL93 | |
| 5 | Elevation 2 | Elev2 | m a.s.l. | Lemke, Wolfram | water depth | |
| 6 | Layer thickness | Thickness | m | Lemke, Wolfram | Post-Ancylus deposits | |
| 7 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 8 | Depth, top/min | Depth top | m | Lemke, Wolfram | ||
| 9 | Depth, bottom/max | Depth bot | m | Lemke, Wolfram | ||
| 10 | Date | Date | Lemke, Wolfram | |||
| 11 | Hydrogen sulfide | H2S | mmol/l | Lemke, Wolfram | mean of three soil horizons (0.05-0.1 m, 0.15-0.25 m, 0.4-0.45 m) | |
| 12 | Methane, sediment | CH4 sed | µmol/cm3 | Lemke, Wolfram | ||
| 13 | Loss on ignition | LOI | % | Lemke, Wolfram |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
613 data points