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In-situ and path-averaged measurements of aerosol optical properties

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


Bos, J.P. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser Communication and Propagation through the Atmosphere and Oceans VI : 8-9 August 2017, San Diego, California, United States
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10408)
ISBN: 978-1-5106-1273-0
ISBN: 978-1-5106-1274-7
Art. 104080V, 11 pp.
Conference "Laser Communication and Propagation through the Atmosphere and Oceans" <6, 2017, San Diego/Calif.>
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), the path-averaged data was provided by a 7-wavelength transmissometer (MSRT) and scintillometers (BLS). Data were collected at two sites: a homogeneous test site in Northern Germany, and over the inhomogeneous False Bay near Cape Town, South Africa. 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. For the homogeneous test site, in-situ and path-averaged sensors yield similar results. For the inhomogeneous test site, sensors may react differently or temporally separated to meteorological events such as a change in wind speed and/or direction.