6533b823fe1ef96bd127e19e
RESEARCH PRODUCT
Ground-based off-line aerosol measurements at Praia, Cape Verde, during the Saharan Mineral Dust Experiment: microphysical properties and mineralogy
K. LiekeDirk ScheuvensDirk ScheuvensLothar SchützAlfred WiedensohlerMartin EbertD. Müller-ebertStephan WeinbruchKonrad KandlerSimon JäckelCarmen EmmelA. SchladitzBranimir ŠEgvićsubject
Atmospheric Science010504 meteorology & atmospheric sciencesMineralogy010501 environmental sciencesengineering.materialMineral dust01 natural sciencesAerosolCape verdedust ; aerosol ; clay particles ; microphysical propertiesIlliteengineeringEnvironmental sciencePlagioclaseKaoliniteHaliteQuartz0105 earth and related environmental sciencesdescription
A large field experiment of the Saharan Mineral Dust Experiment (SAMUM) was performed in Praia, Cape Verde, in January and February 2008. This work reports on the aerosol mass concentrations, size distributions and mineralogical composition of the aerosol arriving at Praia. Three dust periods were recorded during the measurements, divided by transitional periods and embedded in maritime-influenced situations. The total suspended particle mass/PM 10 /PM 2.5 were 250/180/74 μg/m 3 on average for the first dust period (17–21 January) and 250/230/83 μg/m 3 for the second (24–26 January). The third period (28 January to 2 February) was the most intensive with 410/340/130 μg/m 3 . Four modes were identified in the size distribution. The first mode (50–70 nm) and partly the second (700–1100 nm) can be regarded as of marine origin, but some dust contributes to the latter. The third mode (2–4 μm) is dominated by advected dust, while the intermittently occurring fourth mode (15–70 μm) may have a local contribution. The dust consisted of kaolinite (dust/maritime period: 35%wt./25%wt.), K-feldspar (20%wt./25%wt.), illite (14%wt./10%wt.), quartz (11%wt./8%wt.), smectites (6%wt./4%wt.), plagioclase (6%wt./1%wt.), gypsum (4%wt./7%wt.), halite (2%wt./17%wt.) and calcite (2%wt./3%wt.). DOI: 10.1111/j.1600-0889.2011.00546.x
year | journal | country | edition | language |
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2011-01-01 | Tellus B |