Assessing humidity growth effects of different aerosol types using ground-based Raman lidar observations.

Leibniz-Institut für Troposphärenforschung TROPOS

04318 Leipzig

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Assessing humidity growth effects of different aerosol types using ground-based Raman lidar observations.
Datum: 16. September 2024
Erstgutachter: Prof. Dr. Andreas Macke
Kontaktpersonen (mit Kontaktdaten): Dr. Julian Hofer, hofer@tropos.de; Dr. Holger Baars, baars@tropos.de
Zweitgutachter: To be determined
Kurzbeschreibung: Hygroscopic growth and shrinkage processes change the size, refractive index, and partly also the shape of aerosol particles and thus also their optical, radiative and nucleating properties (e.g., Haarig et al., 2017).
PollyXT Raman lidars (Engelmann et al., 2016) have the capability to measure water vapor mixing ratio (e.g., Dai et al., 2018). Simultaneous profiling of water vapor mixing ratio and particle optical properties allow to study aerosol hygroscopicity (e.g., Althausen et al., 2020; Navas-Guzmán et al., 2019).
For calibration and calculation of relative humidity, the use of radiosonde, model, and microwave radiometer data can be intercompared.
Data from PollyNET (Baars et al., 2016), a network of PollyXT lidars, from contrasting stations with different aerosol and humidity conditions like Germany, Cabo Verde, Cyprus, and Tajikistan shall be used.
Literaturselektion: Althausen et al. (EPJ Web Conf. 2020); Baars et al. (ACPD 2016); Dai et al. (Atmos. Meas. Tech. 2018); Engelmann et al. (ATMOS. Meas. Tech. 2016); Haarig et al. (ACP 2017); Navas-Guzmán (ACP 2019)