Variability of dust inputs to the CANIGO zone

Torres-Padrón, M. E.; Gelado-Caballero, M. D.; Collado-Sánchez, C.; Siruela-Matos, V.F; Cardona-Castellano, P.; Hernández‐Brito, J. J.

doi:10.1016/s0967-0645(02)00091-7

Cited by 60 publications

(57 citation statements)

References 24 publications

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“…Our estimates of total (wet+dry) deposition suggest that wet deposition dominates in the ITCZ, as observed by Helmers and Schrems (1995), whereas dry deposition dominates in all the other parts of the transect (73-97% of total deposition). A study of dust loading in the Canary Islands showed that dry deposition accounted for more than 80% of total (Torres-Padron et al, 2002), which is in agreement with our results in the northern part of the transect when influenced by the Saharan plume and in the southern part when influenced by the Angola plume. Wet deposition dominates in the ITCZ due to the very high amount of precipitation in this region.…”

Section: Article In Presssupporting

confidence: 92%

“…ye-Pilot and Martin, 1996), and at Midway in the central Pacific and over the Atlantic Ocean, half of the annual deposition occurs in 2 and 10 weeks, respectively (Prospero et al, 1989;Swap et al, 1996). In the Canary region, dust inputs lasting an average of 3-8 days are produced during winter and summer periods (Torres-Padron et al, 2002). Aeolian inputs are also highly spatially variable: about half the global aeolian input enters the North Pacific Ocean, originating from mainland Asia, and another third is deposited into the North Atlantic from the Sahara (Duce and Tindale, 1991;Jickells and Spokes, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean

Sarthou¹,

Baker²,

Blain³

et al. 2003

Deep Sea Research Part I: Oceanographic Research Papers

182

145

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Atmospheric iron and underway sea-surface dissolved (o0.2 mm) iron (DFe) concentrations were investigated along a north-south transect in the eastern Atlantic Ocean (27 N/16 W-19 S/5 E). Fe concentrations in aerosols and dry deposition fluxes of soluble Fe were at least two orders of magnitude higher in the Saharan dust plume than at the equator or at the extreme south of the transect. A weaker source of atmospheric Fe was also observed in the South Atlantic, possibly originating in southern Africa via the north-easterly outflow of the Angolan plume. Estimations of total atmospheric deposition fluxes (dry plus wet) of soluble Fe suggested that wet deposition dominated in the intertropical convergence zone, due to the very high amount of precipitation and to the fact that a substantial part of Fe was delivered in dissolved form. On the other hand, dry deposition dominated in the other regions of the transect (73-97%), where rainfall rates were much lower. Underway sea-surface DFe concentrations ranged 0.02-1.1 nM. Such low values (0.02 nM) are reported for the first time in the Atlantic Ocean and may be (co)-limiting for primary production. A significant correlation (Spearman's rho=0.862, po0:01) was observed between mean DFe concentrations and total atmospheric deposition fluxes, confirming the importance of atmospheric deposition on the iron cycle in the Atlantic. Residence time of DFe in the surface waters relative to atmospheric inputs were estimated in the northern part of our study area (1778 to 28716 d). These values confirmed the rapid removal of Fe from the surface waters, possibly by colloidal aggregation. r

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Section: Article In Presssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean

Sarthou¹,

Baker²,

Blain³

et al. 2003

Deep Sea Research Part I: Oceanographic Research Papers

182

145

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“…During summer a northward shift in the ITCZ position located around 20-30ºN leads to a more northerly position of the monsoon rain belt system, decreasing the aridity over North Africa and causing northward expansion of the Sahelian savannah into the Sahara region (e.g., Moulin et al, 1997;Bergametti et al, 1989a;Rodríguez et al, 2001;Torres-Padrón et al, 2002). This situation, together with low wind intensity, would reduce the dust emission from the southern and southwestern African regions, favouring terrigenous transport from the northern African regions to the western and central part of the Mediterranean (Moulin et al, 1997).…”

Section: Transport Mechanismsmentioning

confidence: 99%

Radiogenic isotopes for deciphering terrigenous input provenance in the western Mediterranean

et al. 2015

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“…Torres-Padró n et al (2002) observed a seasonal pattern of Saharan dust events with maximum fluxes in winter and summer related to two dominant meteorological scenarios.…”

Section: Introductionmentioning

confidence: 97%

“…These winds can carry desert dust into and over the ocean, although most of the time the boundary between the Harmattan and the maritime Trades is located over the continent parallel to the coast (Van Camp et al, 1991). In contrast, dust outbreaks which appear in boreal summer, favours dust transport from a northern source (Torres-Padró n et al, 2002). Due to the northward migration of the ITCZ to $ 191N (Nicholson, 2000), trade winds blow further north between 201N and 321N (Martinez et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Plewa

Meggers

Kuhlmann

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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a b s t r a c tOne hundred and twenty-eight surface-sediment samples collected off North-West Africa were studied geochemically to detect the expressions of different meridional climate regimes and zonal productivity gradients in the surface sediments. This geochemical multi-tracer approach, coupled with additional information on the bulk carbonate and TOC contents makes it possible to characterise the sedimentological regime in detail. Typical terrigenous elements like Al, K and Fe mirror the importance of the humid (fluvial) influence in the north of the study area and the dominance of aeolian input in the south. Furthermore, the distributions of Ti and Fe in the surface sediments serve as tracers for the supply of eolian volcanic material from the Canary Islands. The spatial variability of the TOC contents in the surface sediments closely follows the ocean surface productivity patterns, whereas the CaCO 3 contents are mainly controlled by dilution with terrigenous matter. The potential productivity proxy Ba is not a reliable tracer for productivity in this region, since it is mainly supplied by terrigenous input (coupled with aluminosilicates).

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Variability of dust inputs to the CANIGO zone

Cited by 60 publications

References 24 publications

Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean

Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean

Radiogenic isotopes for deciphering terrigenous input provenance in the western Mediterranean

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

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