Citation:

acp-17-6023-2017

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Abstract:

Massive amounts of Saharan dust are blown from the African coast of North Africa across the Atlantic Ocean towards the Americas each year. This dust has, depending on its chemistry, direct and indirect effects on global climate including reflection and absorption of solar radiation as well as transport and deposition of nutrients and metals fertilizing both ocean and land. To determine the temporal and spatial variability of Saharan dust transport and deposition and their marine environmental effects across the equatorial North Atlantic Ocean, we have set up a monitoring experiment using deep-ocean sediment traps as well as land-based dust collectors. The sediment traps were deployed at five ocean sites along a transatlantic transect between northwest Africa and the Caribbean along 12° N, in a down-wind extension of the land-based dust collectors placed at 19° N on the Mauritanian coast in Iwik. In this paper, we lay out the setup of the monitoring experiment and present the particle fluxes from sediment trap sampling over 24 continuous and synchronised intervals from October 2012 through to November 2013. We establish the temporal distribution of the particle fluxes deposited in the Atlantic and compare chemical compositions with the land-based dust collectors propagating to the down-wind sediment trap sites, and with satellite observations of Saharan dust outbreaks.

First-year results show that the total mass fluxes in the ocean are highest at the sampling sites in the east and west, closest to the African continent and the Caribbean, respectively. Element ratios reveal that the lithogenic particles deposited nearest to Africa are most similar in composition to the Saharan dust collected in Iwik. Down-wind increasing Al, Fe and K contents suggest a downwind change in the mineralogical composition of Saharan dust and indicate an increasing contribution of clay minerals towards the west. In the westernmost Atlantic, admixture of re-suspended clay-sized sediments advected towards the deep sediment trap cannot be excluded. Seasonality is most prominent near both continents but generally weak, with mass fluxes dominated by calcium carbonate and clear seasonal maxima of biogenic silica towards the west. The monitoring experiment is now extended with autonomous dust sampling buoys for better quantification Saharan dust transport and deposition from source to sink and its impact on fertilization and carbon export to the deep ocean.

Coverage:

Median Latitude: 13.504396 * Median Longitude: -38.623000 * South-bound Latitude: 12.000000 * West-bound Longitude: -57.040000 * North-bound Latitude: 19.885170 * East-bound Longitude: -16.294000

Date/Time Start: 2012-10-27T00:00:00 * Date/Time End: 2013-11-30T00:00:00

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

8 datasets

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Datasets listed in this publication series

Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from time series station Iwik. https://doi.org/10.1594/PANGAEA.872085
Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from sediment trap M1U. https://doi.org/10.1594/PANGAEA.872086
Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from sediment trap M2L. https://doi.org/10.1594/PANGAEA.872087
Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from sediment trap M2U. https://doi.org/10.1594/PANGAEA.872088
Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from sediment trap M3L. https://doi.org/10.1594/PANGAEA.872089
Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from sediment trap M4L. https://doi.org/10.1594/PANGAEA.872090
Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from sediment trap M4U. https://doi.org/10.1594/PANGAEA.872091
Korte, LF; Brummer, G-JA; van der Does, M et al. (2017): Particle fluxes from sediment trap M5L. https://doi.org/10.1594/PANGAEA.872092