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Aerosol optical properties inferred from in-situ and path-averaged measurements

: Binsbergen, S.A. van; Grossmann, P.; Cohen, L.H.; Eijk, A.M.J. van; Stein, K.U.


Stein, Karin (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optics in Atmospheric Propagation and Adaptive Systems XX : 11-14 September 2017, Warsaw, Poland
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10425)
Paper 104250H, 9 pp.
Conference "Optics in Atmospheric Propagation and Adaptive Systems" <20, 2017, Warsaw>
Conference Paper
Fraunhofer IOSB ()

This paper compares in-situ and path-averaged measurements of the electro-optical transmission, with emphasis on aerosol effects. The in-situ sensors consisted of optical particle counters (OPC) and a visibility meter, the path-averaged data was provided by a 7-wavelength transmissometer (MSRT) and a scintillometer (BLS). Data was collected at a test site in Northern Germany. A retrieval algorithm was developed to infer characteristics of the aerosol size distribution (Junge approximation) from the MSRT data. A comparison of the various sensors suggests that the optical particle counters are over-optimistic in their estimate of the transmission.