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Atmospheric boundary layer characteristics from Ceilometer measurements Part 2: application to London’s urban boundary layer

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Kotthaus, S. and Grimmond, C. S. B. (2018) Atmospheric boundary layer characteristics from Ceilometer measurements Part 2: application to London’s urban boundary layer. Quarterly Journal of the Royal Meteorological Society. ISSN 1477-870X (In Press)

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To link to this item DOI: 10.1002/qj.3298

Abstract/Summary

Long-term measurements of mixed layer height (ZML) are possible with advances in detecting ZML from Automatic Lidars and Ceilometers (ALC) observations. Six years of ALC measurements in central London are analysed using the CABAM (‘Characterising the Atmospheric Boundary layer based on ALC Measurements’) algorithm which provides ZML and an ABL classification by cloud cover and type. The boundary layer dynamics are shown to respond to day-length, cloud cover and cloud type. Median daily maxima range from 707 m (stratiform clouds) to 1704 m (days with convective boundary layer clouds following a clear night). A common approach to ABL classification and clear definition of key ZML-indicators would facilitate inter-city comparison. A simple parameterisation based on empirical coefficients derived from the London measurements is proposed to generalise the description of diurnal and seasonal variations in ZML, including cloud conditions. This has the potential to aid improved understanding of the complex relations between surface air quality and boundary layer dynamics.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:76371
Uncontrolled Keywords:Mixed layer height, urban boundary layer, ceilometer, ALC, ABL, boundary layer clouds, CABAM
Publisher:Royal Meteorological Society

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