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@ARTICLE{Schween:187195,
author = {Schween, J. H. and Hirsikko, A. and Löhnert, U. and
Crewell, S.},
title = {{M}ixing-layer height retrieval with ceilometer and
{D}oppler lidar: from case studies to long-term assessment},
journal = {Atmospheric measurement techniques},
volume = {7},
number = {11},
issn = {1867-8548},
address = {Katlenburg-Lindau},
publisher = {Copernicus},
reportid = {FZJ-2015-00869},
pages = {3685 - 3704},
year = {2014},
abstract = {Aerosol signatures observed by ceilometers are frequently
used to derive mixing-layer height (MLH) which is an
essential variable for air quality modelling. However,
Doppler wind lidar measurements of vertical velocity can
provide a more direct estimation of MLH via simple
thresholding. A case study reveals difficulties in the
aerosol-based MLH retrieval during transition times when the
mixing layer builds up in the morning and when turbulence
decays in the afternoon. The difficulties can be explained
by the fact that the aerosol distribution is related to the
history of the mixing process and aerosol characteristics
are modified by humidification. The results of the case
study are generalized by evaluating one year of joint
measurements by a Vaisala CT25K and a HALO Photonics
Streamline wind lidar. On average the aerosol-based
retrieval gives higher MLH than the wind lidar with an
overestimation of MLH by about 300 m (600 m) in the morning
(late afternoon). Also, the daily aerosol-based maximum MLH
is larger and occurs later during the day and the average
morning growth rates are smaller than those derived from the
vertical wind. In fair weather conditions classified by less
than 4 octa cloud cover the mean diurnal cycle of cloud base
height corresponds well to the mixing-layer height showing
potential for a simplified MLH estimation.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {233 - Trace gas and aerosol processes in the troposphere
(POF2-233)},
pid = {G:(DE-HGF)POF2-233},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000345781000005},
doi = {10.5194/amt-7-3685-2014},
url = {https://juser.fz-juelich.de/record/187195},
}