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Schefuß, Enno; Ratmeyer, Volker; Stuut, Jan-Berend W; Jansen, J H Fred; Sinninghe Damsté, Jaap S (2003): Stable carbon isotopic analyses of n-alkanes and the calculated C4 plant-derived fractions in the dust samples. PANGAEA, https://doi.org/10.1594/PANGAEA.141041, Supplement to: Schefuß, E et al. (2003): Carbon isotope analyses of n-alkanes in dust from the lower atmosphere over the central eastern Atlantic. Geochimica et Cosmochimica Acta, 67(10), 1757-1767, https://doi.org/10.1016/S0016-7037(02)01414-X

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Abstract:
Atmospheric dust samples collected along a transect off the West African coast have been investigated for their lipid content and compound-specific stable carbon isotope compositions. The saturated hydrocarbon fractions of the organic solvent extracts consist mainly of long-chain n-alkanes derived from epicuticular wax coatings of terrestrial plants. Backward trajectories for each sampling day and location were calculated using a global atmospheric circulation model. The main atmospheric transport took place in the low-level trade-wind layer, except in the southern region, where long-range transport in the mid-troposphere occurred. Changes in the chain length distributions of the n-alkane homologous series are probably related to aridity, rather than temperature or vegetation type. The carbon preference of the leaf-wax n-alkanes shows significant variation, attributed to a variable contribution of fossil fuel- or marine-derived lipids. The effect of this nonwax contribution on the d13C values of the two dominant n-alkanes in the aerosols, n-C29 and n-C31 alkane, is, however, insignificant. Their d13C values were translated into a percentage of C4 vs. C3 plant type contribution, using a two-component mixing equation with isotopic end-member values from the literature. The data indicate that only regions with a predominant C4 type vegetation, i.e. the Sahara, the Sahel, and Gabon, supply C4 plant-derived lipids to dust organic matter. The stable carbon isotopic compositions of leaf-wax lipids in aerosols mainly reflect the modern vegetation type along their transport pathway. Wind abrasion of wax particles from leaf surfaces, enhanced by a sandblasting effect, is most probably the dominant process of terrigenous lipid contribution to aerosols.
Coverage:
Median Latitude: 6.046250 * Median Longitude: -4.054167 * South-bound Latitude: -10.690000 * West-bound Longitude: -17.930000 * North-bound Latitude: 30.440000 * East-bound Longitude: 12.500000
Date/Time Start: 1998-02-15T00:00:00 * Date/Time End: 1998-03-11T00:00:00
Minimum ALTITUDE: 15 m * Maximum ALTITUDE: 15 m
Event(s):
M41/1_D1 (D1) * Latitude: 30.440000 * Longitude: -11.720000 * Date/Time: 1998-02-15T00:00:00 * Campaign: M41/1 * Basis: Meteor (1986) * Method/Device: Aeolian dust sample (AEOLD) * Comment: Sampling was conducted with Andersen high-volume particulate matter dust samplers installed on the ship`s tower.
M41/1_D10 (D10) * Latitude: 7.260000 * Longitude: -14.190000 * Date/Time: 1998-02-20T00:00:00 * Campaign: M41/1 * Basis: Meteor (1986) * Method/Device: Aeolian dust sample (AEOLD) * Comment: Sampling was conducted with Andersen high-volume particulate matter dust samplers installed on the ship`s tower.
M41/1_D11 (D11) * Latitude: 6.290000 * Longitude: -13.090000 * Date/Time: 1998-02-20T00:00:00 * Campaign: M41/1 * Basis: Meteor (1986) * Method/Device: Aeolian dust sample (AEOLD) * Comment: Sampling was conducted with Andersen high-volume particulate matter dust samplers installed on the ship`s tower.
Comment:
Altitude=15m: Sampling was conducted with Andersen high-volume particulate matter dust samplers installed on the ship's tower.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Latitude of eventLatitude
2Longitude of eventLongitude
3Event labelEvent
4ALTITUDEAltitudemGeocode
5n-Alkane, detected carbon number rangen-Alkane rangeSchefuß, Enno
6Carbon number of the homologue with highest abundanceCmaxSchefuß, EnnoCalculated, see reference(s)
7n-Alkane, average chain lengthACL n-AlkaneSchefuß, EnnoCalculated, see reference(s)
8n-Alkane, C31/(C29+C31) ratioNorm31Schefuß, EnnoCalculated, see reference(s)
9Carbon Preference Index of n-Alkanes (C25-C33)CPI-(25-33)Schefuß, EnnoCalculated, see reference(s)
10n-Alkane C24, δ13CC24 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
11n-Alkane C25, δ13CC25 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
12n-Alkane C26, δ13CC26 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
13n-Alkane C27, δ13CC27 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
14n-Alkane C28, δ13CC28 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
15n-Alkane C29, δ13CC29 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
16n-Alkane C30, δ13CC30 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
17n-Alkane C31, δ13CC31 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
18n-Alkane C32, δ13CC32 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
19n-Alkane C33, δ13CC33 δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)
20n-Alkane weighted mean, δ13Cn-Alkane wm δ13C‰ PDBSchefuß, EnnoGas chromatography - Mass spectrometry (GC-MS)d13C values of the n-C29 and n-C31 alkane
21n-Alkane C4 plantC4 plant%Schefuß, EnnoCalculated, see reference(s)end-member values C3 = -36.0 per mil and C4 = -21.5 per mil
Size:
350 data points

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