Interaction of sinking behaviour of Saharan dust and lithogenic and biogenic fluxes in the Canary Basin
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Báez-Hernández, Maite [1] ; García, Noemí [1] ; Menéndez, Inmaculada [2] ; Jaramillo, Alfredo [1] ; Sánchez-Pérez, Isora [1] ; Santana, Ángelo [1]
;
Alonso, Ignacio
[1]
;
Mangas, José
[3]
;
Hernández-León, Santiago
[3]
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[1] Universidad de Las Palmas de Gran Canaria
Universidad de Las Palmas de Gran Canaria
Gran Canaria, España
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[2] Instituto Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria - Instituto Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria, ULPGC
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[3] Instituto Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria - Instituto Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria
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- Localización: Scientia Marina, ISSN 0214-8358, Vol. 83, Nº. 2, 2019, págs. 121-132
- Idioma: inglés
- DOI: 10.3989/scimar.04877.19A
- Títulos paralelos:
- Interacción sedimentaria del polvo sahariano, y los flujos biogénicos y litogénicos en la cuenca oceánica de Canarias
- Enlaces
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Resumen
- español
En la actualidad los eventos de polvo Sahariano son la fuente principal de partículas litogénicas en la cuenca oceánica de Canarias. Con el objetivo de cuantificar su entrada y la interacción con los flujos biogénicos, se instaló una trampa de sedimento a la deriva, a 150 m de profundidad, 50 km al norte de la costa de Gran Canaria (Islas Canarias). Las partículas litogénicas detectadas fueron de illita, calcita, hematites, cuarzo, barita y caolinita. El material biogénico estaba compuesto por quitina, partículas de exopolímeros transparentes (TEP) y carbonatos procedentes de foraminíferos y conchas de gasterópodos. La media del flujo de polvo sahariano sobre la superficie oceánica fue aproximadamente 5±4 mg m-2 dia-1. Las medias de flujos litogénico, carbonato y quitina respectivamente fueron 0.8±0.6 mg m-2 dia–1, 6.0±7.4 mg m–2 dia-1 y 154±386 mg m-2 dia-1. Durante el muestreo se registró un intenso evento de polvo sahariano seguido, a los tres días, de picos en los flujos litogénicos y biogénicos en la trampa de sedimento a 150 m de profundidad. La velocidad teórica de sedimentación de las partículas litogénicas asociadas a los eventos de polvo sahariano a 150 m de profundidad calculada fue de vStokes=275 m dia-1, siendo la velocidad de sedimentación experimental obtenida tras el análisis de los flujos fue de 50 m dia-1. El comportamiento de los procesos de sedimentación asociados al POC, el flujo biogénico y el flujo litogénico observados en este estudio podría contribuir a modelos más realistas de la bomba biológica de carbono en los océanos.
- English
Saharan dust events are currently the predominant source of lithogenic particles in the Canary Basin. In order to quantify this input and its relationship with the biogenic fluxes, a sediment trap was deployed in a free-drifting system at 150 m depth, 50 km off the north coast of Gran Canaria (Canary Islands). The mineralogy of the lithogenic particles included illite, calcite, hematite quartz, barite and kaolinite. The biogenic matter was composed of chitin, transparent exopolymer particles, and carbonates from foraminifera and gastropod shells. The average Saharan dust flux over the ocean surface was approximately 5±4 mg m–2 day-1. The lithogenic, carbonate and chitin fluxes were 0.8±0.6, 6.0±7.4 and 154±386 mg m–2 day-1, respectively. A fairly strong Saharan dust event during sampling was observed in the trap, with a delay of three days in the peaks of lithogenic and biogenic fluxes. The theoretical settling velocity of the lithogenic particles associated with Saharan dust events at 150 m depth was vStokes=275 m day-1, and the experimental settling was about 50 m day-1. The associated sinking behaviour of particulate organic carbon and biogenic and lithogenic fluxes observed in this study may contribute to a more realistic prediction of these fluxes in carbon biological pump models.
- español
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