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Atmospheric boundary layer dynamics and aerosol properties based on observations of unmanned research aircraft

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Atmospheric boundary layer dynamics and aerosol properties based on observations of unmanned research aircraft

(Taschenbuch, Englisch)

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Abstract The outline of the thesis considers a characterization of dynamic processes and aerosol particles that were studied with unmanned aerial systems (UAS) in the atmospheric boundary 1ayer (ABL) at two investigation areas; in the polar region and at a continental site in Middle Europe. The use of UAS provides a detailed 4-D picture of ABL properties, thus offers a high potential for Billing the sparse small-scale observations that exist in the ABL due to missing measurement tools. The Carolo T200 ”M²AV” (Mini Meteorological Aerial Vehicle) was applied for ABL profiling and investigations of turbulence parameters as part of a I?olarstern cruise in the Antarctic Weddell-Sea during polar night between 8 June and 12 August 2013. Eleven research flights were carried out with the M AV but the field activity was strongly affected by a multitude of critical challenges like ic- ing, strong wind speed and externally driven limitations, mainly influenced by the need of a suitable airfield on sea ice. The results address a detailed inves- tigation of the ABL's stability, measured above closed sea ice and above open water sections at two different sites on 11 July and 1—2 August 2013. The obser- vations are strongly questioning the common picture of a stably stratified ABL, as generally assumed in models that are applied for polar areas. Since October 2013, the UAS Carolo P360 ”ALADINA” (Application of Light-weight Aircraft for Detecting IN-situ Aerosol) was operated for more than 100 research flights at the Leibniz Institute for Tropospheric Research (TROPOS) site in Melpitz, Ger- many. The main focus of the study is on investigating the correlation between ABL's properties and the new particle formation (NPF). This was primarily re- alized by targeting vertical profiles of ultrafine aerosol particles (UFP, usual size < 50 nm) in the lowermost 1 km. According to different selected case studies, a high variability of the observed UFP was identified in the vertical scale and the major impact on the distribution was linked to dynamics of the ABL. In addi- tion, frequently performed profiles of the measured UFP enabled to determine transport and mixing processes. For instance, UFP were lifted upwards from the ground or transported downwards mainly originated from the inversion layer or mixed in short time in the whole ABL. Further, to a significant degree of the ALADINA's measurement period, NPF events would not have been captured by pure ground-based observations. Weniger zeigen

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Produktinformationen

Technische Daten

Erscheinungsdatum

01.01.2022

Sprache

Englisch

EAN

9783947623518

Herausgeber

Technische Uni Braunschweig NFL

Serien- oder Bandtitel

NFL-Forschungsberichte

Sonderedition

Nein

Seitenanzahl

150

Auflage

Einbandart

Taschenbuch

Einbandart Details

Paperback

Warnhinweise und Sicherheitsinformationen

Informationen nach EU Data Act

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