Cassarino, Lucie; Hendry, Katharine R; Henley, Sian Frances; MacDonald, Ellen; Arndt, Sandra; de Freitas, Felipe Sales; Pike, Jennifer; Firing, Yvonne L (2020): Diatom abundances in sediment sampled during James Clark Ross cruise JR15003 in 2015, West Antarctic Peninsula [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.920053
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Abstract:
The West Antarctic Peninsula (WAP) is a highly productive shelf region during austral summer, supporting a rich ecosystem that has a significant impact on carbon sequestration. This ecosystem is heterogeneous, and characterised by biological "hotspots" fuelled largely by diatom production. The specific mechanisms determining the location and extent of these hotspots are not fully understood. Sedimentary enrichment of silicic acid (DSi) relative to other nutrients along the WAP, suggest that nutrient transfer across the sediment-water interface could have an impact on algal community composition. Here we combine reaction-transport modelling with porewater profiles of DSi concentration and stable silicon isotopic composition, biogenic silica content (BSi) and diatom abundances from sediment cores collected along the WAP, to assess the DSi flux and the processes that release this key nutrient from the WAP sediment into the overlying waters. We estimate a DSi diffusive flux of 2.67- 10**10 ± 2.75- 10**9 mol/yr for the WAP continental shelf area, which is lower than that previously estimated for the open Southern Ocean. Porewater isotopic compositions suggest that DSi concentrations are supplied primarily by BSi dissolution and respond to authigenic phase formation. Reaction-transport modelling highlights the highly dynamic environment of core-top sediments and the strong impact of surface productivity on sedimentary processes and the early diagenetic release of DSi. Both observations and modelling suggest a strong pelagic influence on benthic environment with the silicon benthic fluxes highly variable on different temporal and spatial scales, and thus sensitive to sea ice dynamics and climate change.
Supplement to:
Cassarino, Lucie; Hendry, Katharine R; Henley, Sian Frances; MacDonald, Ellen; Arndt, Sandra; de Freitas, Felipe Sales; Pike, Jennifer; Firing, Yvonne L (2020): Sedimentary Nutrient Supply in Productive Hot Spots off the West Antarctic Peninsula Revealed by Silicon Isotopes. Global Biogeochemical Cycles, 34(12), https://doi.org/10.1029/2019GB006486
Coverage:
Median Latitude: -66.313687 * Median Longitude: -67.721593 * South-bound Latitude: -67.582400 * West-bound Longitude: -70.170790 * North-bound Latitude: -64.508990 * East-bound Longitude: -64.847880
Date/Time Start: 2015-12-25T00:00:00 * Date/Time End: 2015-12-28T00:00:00
Minimum DEPTH, sediment/rock: -0.50 m * Maximum DEPTH, sediment/rock: 0.40 m
Event(s):
JR15003_1 * Latitude: -64.508990 * Longitude: -64.847880 * Date/Time: 2015-12-25T00:00:00 * Location: West Antarctic Peninsula * Campaign: JR15003 * Basis: James Clark Ross * Method/Device: Multiple investigations (MULT)
JR15003_2 * Latitude: -66.849670 * Longitude: -70.170790 * Date/Time: 2015-12-27T00:00:00 * Location: West Antarctic Peninsula * Campaign: JR15003 * Basis: James Clark Ross * Method/Device: Multiple investigations (MULT)
JR15003_3 * Latitude: -67.582400 * Longitude: -68.146110 * Date/Time: 2015-12-28T00:00:00 * Location: West Antarctic Peninsula * Campaign: JR15003 * Basis: James Clark Ross * Method/Device: Multiple investigations (MULT)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Cassarino, Lucie | |||
| 2 | Campaign | Campaign | Cassarino, Lucie | |||
| 3 | Station label | Station | Cassarino, Lucie | |||
| 4 | Latitude of event | Latitude | Cassarino, Lucie | |||
| 5 | Longitude of event | Longitude | Cassarino, Lucie | |||
| 6 | DATE/TIME | Date/Time | Cassarino, Lucie | Geocode | ||
| 7 | DEPTH, sediment/rock | Depth sed | m | Cassarino, Lucie | Geocode | |
| 8 | Abundance, marine diatoms | Abund m diatom | 106 #/g | Cassarino, Lucie | ||
| 9 | Chaetoceros spp. resting spores | Chaetoceros spp. rs | % | Cassarino, Lucie | ||
| 10 | Fragilariopsis cylindrus | F. cylindrus | % | Cassarino, Lucie | ||
| 11 | Fragilariopsis curta | F. curta | % | Cassarino, Lucie | ||
| 12 | Fragilariopsis kerguelensis | F. kerguelensis | % | Cassarino, Lucie | ||
| 13 | Thalassiosira antarctica, resting spores | T. antarctica rs | % | Cassarino, Lucie | Rs WARM | |
| 14 | Thalassiosira antarctica | T. antarctica | % | Cassarino, Lucie | veg | |
| 15 | Thalassiosira gracilis var. expecta | T. gracilis var. expecta | % | Cassarino, Lucie | ||
| 16 | Thalassiosira lentiginosa | T. lentiginosa | % | Cassarino, Lucie |
Change history:
2022-05-12T06:47:22 – Coordinates of station 3 were corrected from formerly Latitude: -67.80361 and Longitude: -68.814590 to the current coordinates (-67.5824 and -68.14611)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
456 data points