Holocene Saharan dust deposition on the Cape Verde Islands: sedimentological and Nd‐Sr isotopic evidence

Rognon, Pierre; Coudé-Gaussen, Geneviève; Revel, Marie; Grousset, F.; Pédemay, P.

doi:10.1046/j.1365-3091.1996.d01-8.x

Cited by 57 publications

(47 citation statements)

References 20 publications

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“…These authors showed that the structural water loss for 17 soil samples ranges from 0.56 to 2.45 % at 550 • C. This is consistent with the mass loss results obtained for the Douz soil which contains a significant proportion of quartz and calcite (Lafon et al, 2014). The larger mass loss observed for the Cape Verde soil can be partly due to its composition of quartz, potassic feldspars and an assemblage of illite-kaolinite-chlorite (Rognon et al, 1996;Desboeufs et al, 1999). The larger loss on ignition observed for the atmospheric deposition suggests a higher fraction of volatile compounds in the Frioul samples than in the tested soils.…”

Section: Weighing and Ignition Protocolsupporting

confidence: 77%

An automatic collector to monitor insoluble atmospheric deposition: application for mineral dust deposition

et al. 2015

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Abstract. Deposition is one of the key terms of the mineral dust cycle. However, dust deposition remains poorly constrained in transport models simulating the atmospheric dust cycle. This is mainly due to the limited number of relevant deposition measurements. This paper aims to present an automatic collector (CARAGA), specially developed to sample the total (dry and wet) atmospheric deposition of insoluble dust in remote areas. The autonomy of the CARAGA can range from 25 days to almost 1 year depending on the programmed sampling frequency (from 1 day to 2 weeks respectively). This collector is used to sample atmospheric deposition of Saharan dust on the Frioul islands in the Gulf of Lions in the Western Mediterranean. To quantify the mineral dust mass in deposition samples, a weighing and ignition protocol is applied. Almost 2 years of continuous deposition measurements performed on a weekly sampling basis on Frioul Island are presented and discussed with air mass trajectories and satellite observations of dust. Insoluble mineral deposition measured on Frioul Island was 2.45 g m −2

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Section: Weighing and Ignition Protocolsupporting

confidence: 77%

An automatic collector to monitor insoluble atmospheric deposition: application for mineral dust deposition

et al. 2015

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“…We use the Nd isotope signature of peat to decipher between local and distal sources (such as in Le Roux et al, 2012). The observed eNd variability (À13 to À9) in Misten peat samples is interpreted as a mixing between dust sources (Table 3) from local (Early Cambrian shales = À11.3, André et al, 1986; Early Cambrian phyllades = À10.8 and mean Paleozoic shales = À12.2, Linnemann et al, 2012), regional soils (mean European crust = À10.8, Michard et al, 1985; mean European loess = À11.6, data from Gallet et al, 1998) and desert particles (mean Saharan airbornes = À12.9 -data from Goldstein et al, 1984;Grousset et al, 1988a,b;Colin, 1993;Henry et al, 1994;Rognon et al, 1996). The eNd variability is further compared with the humification degree to evaluate the local relative humidity conditions (Fig.…”

Section: Climate-related Dust Record In Misten Peat Bog Over the Histmentioning

confidence: 99%

Deciphering human–climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500years (Misten bog, Belgium)

Fagel

Allan

Roux

et al. 2014

Geochimica et Cosmochimica Acta

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, et al.. Deciphering human-climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500 years (Misten bog, Belgium). Geochimica et Cosmochimica Acta, Elsevier, 2014Elsevier, , vol. 135, pp. 288-306. 10.1016Elsevier, /j.gca.2014 To cite this Fagel, Nathalie and Allan, Mohammed and Le Roux, Gaël and Mattielli, Nadine and Piotrowska, Natalia and Sikorski, Jaroslaw AbstractA high-resolution peat record from Eastern Belgium reveals the chronology of dust deposition for the last 2500 years. REE and lithogenic elements in addition to Nd and Pb isotopes were measured in a 173 cm age-dated peat profile and provide a continuous chronology of dust source and intensity. Calculated dust flux show pronounced increases c. 300 BC, 600 AD, 1000 AD, 1200 AD and from 1700 AD, corresponding to local and regional human activities combined with climate change.The Industrial Revolution samples (1700-1950 AD) are characterised by a significant enrichment in Sc-normalised REE abundance (sum REE/Sc > 25) due to intensive coal combustion. For the pre-Industrial Revolution samples, the Sc-normalised REE abundance (10 < Sum REE/Sc < 25) and the eNd variability (À13 to À9) are interpreted by a mixing between dust particles from local soils and long-range transport of desert particles. Three periods characterised by dominant-distal sources (c. 320 AD, 1000 AD and 1700 AD) are consistent with local wetter-than-average intervals as indicated by a lower degree of peat humification. Local erosion prevails during the drier (higher humification) intervals (100 AD, 600 AD). On a global scale, more distal supplies are driven during colder periods, in particular during the Oort and Maunder minima, suggesting a potential link between dust deposition and global climate. Combining REE abundance, fractionation between Light REE and Heavy REE and Nd isotope data in ombrotrophic peat allows one to distinguish between dust flux changes related to human and climate forcings.

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“…The precipitation Sr flux was based on the precipitation Ca flux and the measured Ca/Sr ratio of precipitation. 87 Sr/ 86 Sr ratios of streamwater, precipitation, and bedrock were directly measured, and the 87 Sr/ 86 Sr ratio of Saharan dust was taken from previous studies of airborne dust and ocean sediment from the tropical North Atlantic (Biscaye et al 1974;Grousset et al 1988;Grousset et al 1998;Grousset et al 1992;Rognon et al 1996). Specifically, the Sr isotope approach calculates the dust weathering flux, setting a minimum lower bound on the dust deposition flux.…”

Section: Site Descriptionmentioning

confidence: 99%

Contributions of dust to phosphorus cycling in tropical forests of the Luquillo Mountains, Puerto Rico

Pett-Ridge

2009

Biogeochemistry

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The input of phosphorus (P) through mineral aerosol dust deposition may be an important component of nutrient dynamics in tropical forest ecosystems. A new dust deposition calculation is used to construct a broad analysis of the importance of dust-derived P to the P budget of a montane wet tropical forest in the Luquillo Mountains of Puerto Rico. The dust deposition calculation used here takes advantage of an internal geochemical signal (Sr isotope mass balance) to provide a spatially integrated longer-term average dust deposition flux. Dust inputs of P (0.23 ± 0.08 kg ha -1 year -1 ) are compared with watershed-average inputs of P to the soil through the conversion of underlying saprolite into soil (between 0.07 and 0.19 kg ha -1 year -1 ), and with watershed-average losses of soil P through leaching (between 0.02 and 0.14 kg ha -1 year -1 ) and erosion (between 0.04 and 1.38 kg ha -1 year -1 ). The similar magnitude of dust-derived P inputs to that of other fluxes indicates that dust is an important component of the soil and biomass P budget in this ecosystem. Dust-derived inputs of P alone are capable of completely replacing the total soil and biomass P pool on a timescale of between 2.8 ka and 7.0 ka, less than both the average soil residence time (*15 ka) and the average landslide recurrence interval (*10 ka).

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Holocene Saharan dust deposition on the Cape Verde Islands: sedimentological and Nd‐Sr isotopic evidence

Cited by 57 publications

References 20 publications

An automatic collector to monitor insoluble atmospheric deposition: application for mineral dust deposition

An automatic collector to monitor insoluble atmospheric deposition: application for mineral dust deposition

Deciphering human–climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500years (Misten bog, Belgium)

Contributions of dust to phosphorus cycling in tropical forests of the Luquillo Mountains, Puerto Rico

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