Use of ceilometer determined mixing layer height for explanation of changes in pollutants concentration gradient during the day

0507805 - ÚVGZ 2020 DE eng A - Abstrakt
Komínková, Kateřina
Use of ceilometer determined mixing layer height for explanation of changes in pollutants concentration gradient during the day.
International Symposium for the Advancement of Boundary. 2019. s. 27-28.
[The 19th International Symposium for the Advancement of Boundary-Layer Remote Sensing (ISARS). 22.05.2018-25.05.2018, Kolín nad Rýnem]
Grant CEP: GA MŠMT(CZ) LM2015061; GA MŠMT(CZ) LO1415
Institucionální podpora: RVO:86652079
Klíčová slova: ceilometer * mixing layer height * ozone vertical distributions
Obor OECD: Environmental sciences (social aspects to be 5.7)
https://events.uni-koeln.de/frontend/unikoeln/media/ISARS_2018/ISARS_booklet_20180522.pdf

For interpretation of air pollutants concentrations in the air the one of the key parameter is the atmospheric boundary layer (ABL) evolution during a day and night. In the light part of the day we can expected an evolution of convective Mixing Layer – ML with typical turbulent flow which results uniformly distribution of pollutants throughout the full thickness of ABL. A lot of ground remote sensing methods was developed for determination of ABL development during the day. One of this devices is ceilometer based on the lidar (Light Detection And Ranging) technology. Ceilometer measures light backscatter from the atmospheric aerosol particles. The vertical distribution of airborne particles with some certainty copies structure of ABL. By using of numerical methodsit is possible to determine a ML height from measured backscatter profile. At the Atmospheric Station (AS) Křešín u Pacova in central Czech Republic the concentrations of several different compounds (e.g. CO2 or O3) are measured at a number of levels of 250m tall meteorological mast. Different vertical distributions of these concentrations are very often observed during the nigh time while the concentrations in the light part of day are in the opposite very similar at all levels of measurement. Simultaneously the Vaisala CL51 ceilometer is operated at the ground in close proximity of the mast. Vaisala BL-VIEV software is used to record data and determine ML height from ceilometer. It reports up to three candidates of potential ML height at the same time so this data need significant post processing by experienced operator to decide what candidate is the best. Data from radiosonde measurement or online available modelled extrapolated sounding data can be very useful for this evaluation. This way processed ML height information can very satisfactory explain the evolution of compounds concentrations in the atmosphere during the day.
Klíčová slova: ceilometer, mixing layer height, ozone vertical distributions
Trvalý link: http://hdl.handle.net/11104/0300583