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000811716 1001_ $$0P:(DE-HGF)0$$aRosati, Bernadette$$b0
000811716 245__ $$aStudying the vertical aerosol extinction coefficient by comparing in situ airborne data and elastic backscatter lidar
000811716 260__ $$aKatlenburg-Lindau$$bEGU$$c2016
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000811716 520__ $$aVertical profiles of aerosol particle optical properties were explored in a case study near the San Pietro Capofiume (SPC) ground station during the PEGASOS Po Valley campaign in the summer of 2012. A Zeppelin NT airship was employed to investigate the effect of the dynamics of the planetary boundary layer at altitudes between ∼  50 and 800 m above ground. Determined properties included the aerosol particle size distribution, the hygroscopic growth factor, the effective index of refraction and the light absorption coefficient. The first three parameters were used to retrieve the light scattering coefficient. Simultaneously, direct measurements of both the scattering and absorption coefficient were carried out at the SPC ground station. Additionally, a single wavelength polarization diversity elastic lidar system provided estimates of aerosol extinction coefficients using the Klett method to accomplish the inversion of the signal, for a vertically resolved comparison between in situ and remote-sensing results. Note, however, that the comparison was for the most part done in the altitude range where the overlap function is incomplete and accordingly uncertainties are larger. First, the airborne results at low altitudes were validated with the ground measurements. Agreement within approximately ±25 and ±20 % was found for the dry scattering and absorption coefficient, respectively. The single scattering albedo, ranged between 0.83 and 0.95, indicating the importance of the absorbing particles in the Po Valley region. A clear layering of the atmosphere was observed during the beginning of the flight (until ∼  10:00 LT – local time) before the mixing layer (ML) was fully developed. Highest extinction coefficients were found at low altitudes, in the new ML, while values in the residual layer, which could be probed at the beginning of the flight at elevated altitudes, were lower. At the end of the flight (after ∼  12:00 LT) the ML was fully developed, resulting in constant extinction coefficients at all altitudes measured on the Zeppelin NT. Lidar estimates captured these dynamic features well and good agreement was found for the extinction coefficients compared to the in situ results, using fixed lidar ratios (LR) between 30 and 70 sr for the altitudes probed with the Zeppelin. These LR are consistent with values for continental aerosol particles that can be expected in this region.
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000811716 7001_ $$0P:(DE-HGF)0$$aHerrmann, Erik$$b1$$eCorresponding author
000811716 7001_ $$0P:(DE-HGF)0$$aBucci, Silvia$$b2
000811716 7001_ $$0P:(DE-HGF)0$$aFierli, Federico$$b3
000811716 7001_ $$0P:(DE-HGF)0$$aCairo, Francesco$$b4
000811716 7001_ $$0P:(DE-HGF)0$$aGysel, Martin$$b5
000811716 7001_ $$0P:(DE-Juel1)5344$$aTillmann, Ralf$$b6$$ufzj
000811716 7001_ $$0P:(DE-HGF)0$$aGröß, Johannes$$b7
000811716 7001_ $$0P:(DE-HGF)0$$aGobbi, Gian Paolo$$b8
000811716 7001_ $$0P:(DE-HGF)0$$aDi Liberto, Luca$$b9
000811716 7001_ $$0P:(DE-HGF)0$$aDi Donfrancesco, Guido$$b10
000811716 7001_ $$0P:(DE-HGF)0$$aWiedensohler, Alfred$$b11
000811716 7001_ $$0P:(DE-HGF)0$$aWeingartner, Ernest$$b12
000811716 7001_ $$0P:(DE-HGF)0$$aVirtanen, Annele$$b13
000811716 7001_ $$0P:(DE-Juel1)16346$$aMentel, Thomas F.$$b14$$ufzj
000811716 7001_ $$0P:(DE-HGF)0$$aBaltensperger, Urs$$b15
000811716 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-16-4539-2016$$gVol. 16, no. 7, p. 4539 - 4554$$n7$$p4539 - 4554$$tAtmospheric chemistry and physics$$v16$$x1680-7324$$y2016
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