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Flentje, H.* ; Briel, B.* ; Beck, C.* ; Collaud Coen, M.* ; Fricke, M.* ; Cyrys, J. ; Gu, J. ; Pitz, M.* ; Thomas, W.*

Identification and monitoring of Saharan dust: An inventory representative for South Germany since 1997.

Atmos. Environ. 109, 87-96 (2015)
Open Access Green as soon as Postprint is submitted to ZB.
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
e-ISSN 1873-2844
Quellenangaben Volume: 109, Issue: , Pages: 87-96 Article Number: , Supplement: ,
Publisher Elsevier
Publishing Place Oxford
Reviewing status Peer reviewed