Środowiskowe Seminarium Fizyki Atmosfery
sala B4.58, ul. Pasteura 5
2025-04-25 (13:15) 
mgr Maciej Karasewicz (Instytut Geofizyki, Wydział Fizyki, Uniwersytet Warszawski)
Lidar-derived Vertical Aerosol Flux in Boundary Layer
Aerosol deposition and resuspension associated with vertical aerosol fluxes can be studied using the Eddy Covariance (EC) technique with use of in-situ instruments. The vertical aerosol fluxes are then defined as a covariance of aerosol mass concentration and vertical velocity of the air mass movement close to the Earth surface. The use of Doppler lidar measurements in combination of EC technique can provide information in larger extent of altitudes. The lidar-based EC method utilizes the lidar backscatter coefficient as an equivalent to aerosol mass concentration and lidar vertical velocity of the air mass movement at different altitudes. Thus, remote measurements of vertical aerosol fluxes and their characterization across full height of Atmospheric Boundary Layer (ABL) is possible.
We analyzed two years (2022-2023) of the Doppler lidar (StreamLine, Halo Photonics) observations at the Warsaw Observatory Station (WOS) of the Institute of Geophysics, Faculty of Physics, University of Warsaw. The aerosol fluxes within the boundary layer were derived with high resolution of 30m and 30s. During spring, summer and autumn seasons (MAM, JJA, SON) significant differences in the resuspension and deposition velocity within ABL occurred below and above |+/-1| cm/s for nighttime and daytime, respectively. However during winter season (DJF) practically no such differences were observed; the resuspension and deposition velocities were mostly below |+/-1| cm/s. Data analysis showed that the urban ecosystem of Warsaw is generally characterized by a higher emission than deposition of atmospheric aerosols.Differences in seasonal and diurnal cycles at various altitude ranges were obtained in terms of the velocity changes of aerosol resuspension and deposition, thus providing the first-ever characterization of vertical aerosol fluxes in an urban environment based on WOS long-term measurements.This work contributes to the activities within the Aerosol Cloud and Trace gases Research Infrastructure (ACTRIS-ERIC); WOS is supported operationally by UW and MNiSW.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/95402946042?pwd=GD0WJGAETaUoJ4jvK3Z8vcKcUrpZP7.1
Meeting ID: 954 0294 6042
Passcode: 463587
We analyzed two years (2022-2023) of the Doppler lidar (StreamLine, Halo Photonics) observations at the Warsaw Observatory Station (WOS) of the Institute of Geophysics, Faculty of Physics, University of Warsaw. The aerosol fluxes within the boundary layer were derived with high resolution of 30m and 30s. During spring, summer and autumn seasons (MAM, JJA, SON) significant differences in the resuspension and deposition velocity within ABL occurred below and above |+/-1| cm/s for nighttime and daytime, respectively. However during winter season (DJF) practically no such differences were observed; the resuspension and deposition velocities were mostly below |+/-1| cm/s. Data analysis showed that the urban ecosystem of Warsaw is generally characterized by a higher emission than deposition of atmospheric aerosols.Differences in seasonal and diurnal cycles at various altitude ranges were obtained in terms of the velocity changes of aerosol resuspension and deposition, thus providing the first-ever characterization of vertical aerosol fluxes in an urban environment based on WOS long-term measurements.This work contributes to the activities within the Aerosol Cloud and Trace gases Research Infrastructure (ACTRIS-ERIC); WOS is supported operationally by UW and MNiSW.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/95402946042?pwd=GD0WJGAETaUoJ4jvK3Z8vcKcUrpZP7.1
Meeting ID: 954 0294 6042
Passcode: 463587