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Fischer, Gerhard (2019): Particle fluxes of thirteen sediment traps off Cape Blanc, Mauritania. PANGAEA, https://doi.org/10.1594/PANGAEA.904422, Supplement to: Fischer, Gerhard; Romero, Oscar E; Toby, E; Iversen, Morten Hvitfeldt; Donner, Barbara; Mollenhauer, Gesine; Nowald, Nicolas; Ruhland, Götz; Klann, Marco; Hamady, Bambaye Ould; Wefer, Gerold (2019): Changes in the dust‐influenced biological carbon pump in the Canary Current System: Implications from a coastal and an offshore sediment trap record off Cape Blanc, Mauritania. Global Biogeochemical Cycles, 33(8), 1100-1128, https://doi.org/10.1029/2019GB006194

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Abstract:
Long-term data characterizing the oceans' biological carbon pump are essential for understanding impacts of climate variability on marine ecosystems. The 'Bakun upwelling intensification hypothesis' suggests intensified coastal upwelling due to a greater land-sea temperature gradient influenced by global warming. We present particle fluxes from ca. 1200-3600m water depth from a coastal and an offshore sediment trap setting located in the Canary Current upwelling. Organic carbon (Corg) and biogenic opal (BSi, diatoms) fluxes were two- to three-fold higher at the coastal upwelling site compared to the offshore site, respectively, and showed higher seasonality with flux maxima in spring. Fluxes of dust regularly showed maxima in winter when frequent low-altitude dust storms and deposition occurred, decreasing offshore by about three-fold. We obtained a high temporal match of short-term peaks of BSi and dust fluxes in winter-spring at the coastal site. Corg and BSi fluxes revealed a decreasing trend from 2006 to 2016 at the coastal site, pointing to coastal upwelling relaxation during the last two decades. The permanent offshore upwelling zone of the Canary Current showed no signs of increasing upwelling as well, which contradicts the Bakun hypothesis.
Keyword(s):
Canary Current; carbon fluxes; coastal upwelling
Coverage:
Median Latitude: 20.767430 * Median Longitude: -18.716792 * South-bound Latitude: 20.741667 * West-bound Longitude: -18.741667 * North-bound Latitude: 20.883333 * East-bound Longitude: -18.698300
Date/Time Start: 2003-06-05T00:00:00 * Date/Time End: 2016-02-18T00:00:00
Minimum DEPTH, water: 1249 m * Maximum DEPTH, water: 1362 m
Event(s):
CBeu1 * Latitude: 20.750000 * Longitude: -18.700000 * Date/Time Start: 2003-06-05T00:00:00 * Date/Time End: 2004-04-05T00:00:00 * Elevation: -2714.0 m * Location: Cape Blanc, Mauritania * Method/Device: Trap (TRAP)
CBeu-10 * Latitude: 20.776667 * Longitude: -18.736667 * Date/Time Start: 2012-01-26T00:00:00 * Date/Time End: 2013-01-26T00:00:00 * Elevation: -2712.0 m * Location: Cape Blanc, Mauritania * Method/Device: Trap (TRAP)
CBeu-11 * Latitude: 20.773333 * Longitude: -18.740000 * Date/Time Start: 2013-01-29T00:00:00 * Date/Time End: 2014-02-10T00:00:00 * Elevation: -2800.0 m * Location: Cape Blanc, Mauritania * Method/Device: Trap (TRAP)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventFischer, Gerhard
2Latitude of eventLatitudeFischer, Gerhard
3Longitude of eventLongitudeFischer, Gerhard
4Elevation of eventElevationmFischer, Gerhard
5Sample code/labelSample labelFischer, Gerhardcup number
6DEPTH, waterDepth watermFischer, GerhardGeocode
7Date/time startDate/time startFischer, Gerhard
8Date/time endDate/time endFischer, Gerhard
9Duration, number of daysDurationdaysFischer, Gerhard
10Opal fluxbSiO2 fluxmg/m2/dayFischer, Gerhard
11Carbon, organic fluxTOC fluxmg/m2/dayFischer, Gerhard
12Lithogenic flux per dayLitho fluxmg/m2/dayFischer, Gerhard
Size:
2190 data points

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