Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaign
Accurate continuous measurements of relative humidity (RH) vertical profiles in the lower troposphere have become a significant scientific challenge. In recent years a synergy of various ground-based remote sensing instruments have been successfully used for RH vertical profiling, which has resul...
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Series: | Annales Geophysicae |
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doaj-24455622bc5d4b0291c96d6286a430a42020-11-25T00:24:42ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762018-02-013621322910.5194/angeo-36-213-2018Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaignL. D. Labzovskii0A. Papayannis1I. Binietoglou2I. Binietoglou3R. F. Banks4R. F. Banks5J. M. Baldasano6J. M. Baldasano7F. Toanca8C. G. Tzanis9J. Christodoulakis10School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, ChinaLaser Remote Sensing Laboratory, Physics Department, National Technical University of Athens, Athens, Zografou, 15780, GreeceLaser Remote Sensing Laboratory, National Institute of R&D for Optoelectronics, Magurele (Ilfov), 07712, RomaniaRaymterics S.A., Spartis 32, Metamorfosi Attikis, 14452, GreeceEarth Sciences Department, Barcelona Supercomputing Center-Centro Nacional de Supercomutación (BSC-CNS), Barcelona, 08034, SpainDepartment of Geoscience and Remote Sensing, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, 2628 CN, the NetherlandsEarth Sciences Department, Barcelona Supercomputing Center-Centro Nacional de Supercomutación (BSC-CNS), Barcelona, 08034, SpainEnvironmental Modelling Laboratory, Technical University of Catalonia (UPC), Barcelona, 08028, SpainLaser Remote Sensing Laboratory, National Institute of R&D for Optoelectronics, Magurele (Ilfov), 07712, RomaniaSection of Environmental Physics and Meteorology, Department of Physics, National and Kapodistrian University of Athens, Athens, 15784, GreeceSection of Environmental Physics and Meteorology, Department of Physics, National and Kapodistrian University of Athens, Athens, 15784, GreeceAccurate continuous measurements of relative humidity (RH) vertical profiles in the lower troposphere have become a significant scientific challenge. In recent years a synergy of various ground-based remote sensing instruments have been successfully used for RH vertical profiling, which has resulted in the improvement of spatial resolution and, in some cases, of the accuracy of the measurement. Some studies have also suggested the use of high-resolution model simulations as input datasets into RH vertical profiling techniques. In this paper we apply two synergetic methods for RH profiling, including the synergy of lidar with a microwave radiometer and high-resolution atmospheric modeling. The two methods are employed for RH retrieval between 100 and 6000 m with increased spatial resolution, based on datasets from the HygrA-CD (Hygroscopic Aerosols to Cloud Droplets) campaign conducted in Athens, Greece from May to June 2014. RH profiles from synergetic methods are then compared with those retrieved using single instruments or as simulated by high-resolution models. Our proposed technique for RH profiling provides improved statistical agreement with reference to radiosoundings by 27 % when the lidar–radiometer (in comparison with radiometer measurements) approach is used and by 15 % when a lidar model is used (in comparison with WRF-model simulations). Mean uncertainty of RH due to temperature bias in RH profiling was ∼ 4.34 % for the lidar–radiometer and ∼ 1.22 % for the lidar–model methods. However, maximum uncertainty in RH retrievals due to temperature bias showed that lidar-model method is more reliable at heights greater than 2000 m. Overall, our results have demonstrated the capability of both combined methods for daytime measurements in heights between 100 and 6000 m when lidar–radiometer or lidar–WRF combined datasets are available.https://www.ann-geophys.net/36/213/2018/angeo-36-213-2018.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
L. D. Labzovskii A. Papayannis I. Binietoglou I. Binietoglou R. F. Banks R. F. Banks J. M. Baldasano J. M. Baldasano F. Toanca C. G. Tzanis J. Christodoulakis |
spellingShingle |
L. D. Labzovskii A. Papayannis I. Binietoglou I. Binietoglou R. F. Banks R. F. Banks J. M. Baldasano J. M. Baldasano F. Toanca C. G. Tzanis J. Christodoulakis Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaign Annales Geophysicae |
author_facet |
L. D. Labzovskii A. Papayannis I. Binietoglou I. Binietoglou R. F. Banks R. F. Banks J. M. Baldasano J. M. Baldasano F. Toanca C. G. Tzanis J. Christodoulakis |
author_sort |
L. D. Labzovskii |
title |
Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaign |
title_short |
Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaign |
title_full |
Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaign |
title_fullStr |
Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaign |
title_full_unstemmed |
Relative humidity vertical profiling using lidar-based synergistic methods in the framework of the Hygra-CD campaign |
title_sort |
relative humidity vertical profiling using lidar-based synergistic methods in the framework of the hygra-cd campaign |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2018-02-01 |
description |
Accurate continuous measurements of relative humidity (RH) vertical profiles
in the lower troposphere have become a significant scientific challenge. In
recent years a synergy of various ground-based remote sensing instruments
have been successfully used for RH vertical profiling, which has resulted in
the improvement of spatial resolution and, in some cases, of the accuracy of
the measurement. Some studies have also suggested the use of high-resolution
model simulations as input datasets into RH vertical profiling techniques. In
this paper we apply two synergetic methods for RH profiling, including the
synergy of lidar with a microwave radiometer and high-resolution atmospheric
modeling. The two methods are employed for RH retrieval between 100 and 6000 m
with increased spatial resolution, based on datasets from the HygrA-CD
(Hygroscopic Aerosols to Cloud Droplets) campaign conducted in Athens,
Greece from May to June 2014. RH profiles from synergetic methods are then
compared with those retrieved using single instruments or as simulated by
high-resolution models. Our proposed technique for RH profiling provides
improved statistical agreement with reference to radiosoundings by 27 %
when the lidar–radiometer (in comparison with radiometer measurements)
approach is used and by 15 % when a lidar model is used (in comparison with
WRF-model simulations). Mean uncertainty of RH due to temperature bias in RH
profiling was ∼ 4.34 % for the lidar–radiometer and
∼ 1.22 % for the lidar–model methods. However, maximum
uncertainty in RH retrievals due to temperature bias showed that lidar-model
method is more reliable at heights greater than 2000 m. Overall, our results
have demonstrated the capability of both combined methods for daytime
measurements in heights between 100 and 6000 m when lidar–radiometer or
lidar–WRF combined datasets are available. |
url |
https://www.ann-geophys.net/36/213/2018/angeo-36-213-2018.pdf |
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