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Identification and monitoring of Saharan dust: An inventory representative for South Germany since 1997.
Atmos. Environ. 109, 87-96 (2015)
An inventory of Sahara dust (SD) events at the Hohenpeiβenberg Global Atmosphere Watch station (Germany) is presented for the period 1997-2013. Based on daily in-situ measurements, high Ca2+-ion concentrations and large particle volume concentrations at diameters dp≈0.5-7μm are inferred as indicators for days influenced by SD. The resulting SD catalogue agrees with SD time series from Schneefernerhaus, Augsburg and Jungfraujoch stations. On average, SD occurs in 5-15 SD events (SDE) per year covering about 10-60 days/yr in the mixing layer. SDE exhibit a clear seasonality with spring and early autumn maxima, and typically last for 1-3 days. SDE are equally frequent but more significant at Alpine levels due to lower background. Wet deposition of Ca2+ at the surface is little correlated (R2=0.14) with particle Ca2+ on a daily basis and yields an average annual Ca2+ immission of 0.22±0.04g/m2yr, about 40% of which is due to SD. The majority of outstanding weekly Fe and Al depositions are associated with SDE. SD contributes about 0.5±0.1μg/m3 to the total particle mass with a decreasing trend from 6% to 4% (-0.1%/yr) in the 1997-2013 period. Except from one, all threshold exceedances according to European legislation (daily PM1050μg/m3) at Hohenpeiβenberg are due to SD. Implications are discussed with respect to SD-related circulation patterns, SD-induced temperature anomalies in weather forecast models and the capability of aerosol models to capture SDE.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Climatology ; Pm10 ; Saharan Dust ; Trend; Radiative Properties; Light-absorption; Mineral Aerosol; Isotope; Nephelometer; Climatology; Deposition; Transport; Element; Health
ISSN (print) / ISBN 1352-2310
Journal Atmospheric Environment
Quellenangaben Volume: 109, Pages: 87-96
Publishing Place Oxford
Reviewing status Peer reviewed
Institute(s) Institute of Epidemiology II (EPI2)