The eVe reference polarisation lidar system for the calibration and validation of the Aeolus L2A product
-
Published:2022-04-14
Issue:7
Volume:15
Page:2299-2323
-
ISSN:1867-8548
-
Container-title:Atmospheric Measurement Techniques
-
language:en
-
Short-container-title:Atmos. Meas. Tech.
Author:
Paschou Peristera, Siomos NikolaosORCID, Tsekeri Alexandra, Louridas Alexandros, Georgoussis George, Freudenthaler Volker, Binietoglou IoannisORCID, Tsaknakis George, Tavernarakis Alexandros, Evangelatos Christos, von Bismarck Jonas, Kanitz Thomas, Meleti Charikleia, Marinou EleniORCID, Amiridis VassilisORCID
Abstract
Abstract. The eVe dual-laser/dual-telescope lidar system is introduced here, focusing
on the optical and mechanical parts of the system's emission and receiver
units. The compact design of the linear–circular emission unit along with
the linear–circular analyser in the receiver unit allows eVe to
simultaneously reproduce the operation of the ALADIN lidar on board Aeolus
as well as to operate it as a traditional ground-based polarisation lidar
system with linear emission. As such, the eVe lidar aims to provide (a) ground reference measurements for the validation of the Aeolus L2A aerosol
products and (b) the conditions for which linear polarisation lidar systems
can be considered for Aeolus L2A validation, by identifying any possible
biases arising from the different polarisation state in the emission between
ALADIN and these systems, and the detection of only the co-polar component
of the returned signal from ALADIN for the L2A products' retrieval. In
addition, a brief description is given concerning the polarisation
calibration techniques that are applied in the system, as well as the
developed software for the analysis of the collected signals and the
retrieval of the optical products. More specifically, the system's dual
configuration enables the retrieval of the optical properties of particle
backscatter and extinction coefficients originating from the two different
polarisation states of the emission and the linear and circular depolarisation
ratios, as well as the direct calculation of the Aeolus-like backscatter
coefficient, i.e. the backscatter coefficient that Aeolus would measure
from the ground. Two cases, one with slightly depolarising particles and one
with moderately depolarising particles, were selected from the first
conducted measurements of eVe in Athens in September 2020, in order to
demonstrate the system's capabilities. In the slightly depolarising scene,
the Aeolus-like backscatter coefficient agrees well with the actual
backscatter coefficient, which is also true when non-depolarising particles
are present. The agreement however fades out for strongly depolarising
scenes, where an underestimation of ∼18 % of the Aeolus
like backscatter coefficient is observed when moderately depolarising
particles are probed.
Funder
European Space Agency H2020 European Research Council
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference74 articles.
1. Ansmann, A., Wandinger, U., Riebesell, M., Weitkamp, C., and Michaelis, W.:
Independent measurement of extinction and backscatter profiles in cirrus
clouds by using a combined Raman elastic-backscatter lidar, Appl. Opt.,
31, 7113–7131, https://doi.org/10.1364/AO.31.007113, 1992. 2. Ansmann, A., Wandinger, U., Le Rille, O., Lajas, D., and Straume, A. G.:
Particle backscatter and extinction profiling with the spaceborne
high-spectral-resolution Doppler lidar ALADIN: methodology and simulations,
Appl. Opt., 46, 6606, https://doi.org/10.1364/AO.46.006606, 2007. 3. Ansmann, A., Tesche, M., Groß, S., Freudenthaler, V., Seifert, P.,
Hiebsch, A., Schmidt, J., Wandinger, U., Mattis, I., Müller, D., and
Wiegner, M.: The 16 April 2010 major volcanic ash plume over central Europe:
EARLINET lidar and AERONET photometer observations at Leipzig and Munich,
Germany, Geophys. Res. Lett., 37, L13810, https://doi.org/10.1029/2010GL043809, 2010. 4. Baars, H., Kanitz, T., Engelmann, R., Althausen, D., Heese, B., Komppula, M., Preißler, J., Tesche, M., Ansmann, A., Wandinger, U., Lim, J.-H., Ahn, J. Y., Stachlewska, I. S., Amiridis, V., Marinou, E., Seifert, P., Hofer, J., Skupin, A., Schneider, F., Bohlmann, S., Foth, A., Bley, S., Pfüller, A., Giannakaki, E., Lihavainen, H., Viisanen, Y., Hooda, R. K., Pereira, S. N., Bortoli, D., Wagner, F., Mattis, I., Janicka, L., Markowicz, K. M., Achtert, P., Artaxo, P., Pauliquevis, T., Souza, R. A. F., Sharma, V. P., van Zyl, P. G., Beukes, J. P., Sun, J., Rohwer, E. G., Deng, R., Mamouri, R.-E., and Zamorano, F.: An overview of the first decade of PollyNET: an emerging network of automated Raman-polarization lidars for continuous aerosol profiling, Atmos. Chem. Phys., 16, 5111–5137, https://doi.org/10.5194/acp-16-5111-2016, 2016. 5. Behrendt, A., Pal, S., Wulfmeyer, V., Valdebenito B., Á. M., and Lammel,
G.: A novel approach for the characterization of transport and optical
properties of aerosol particles near sources – Part I: Measurement of
particle backscatter coefficient maps with a scanning UV lidar, Atmos.
Environ., 45, 2795–2802, https://doi.org/10.1016/j.atmosenv.2011.02.061, 2011.
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. An Overview of the ASKOS Campaign in Cabo Verde;16th International Conference on Meteorology, Climatology and Atmospheric Physics—COMECAP 2023;2023-09-21 2. Utilizing AEOLUS to Improve Dust Transport Modelling;16th International Conference on Meteorology, Climatology and Atmospheric Physics—COMECAP 2023;2023-09-15 3. eVe Lidar Measurements during the ASKOS/JATAC Campaign;16th International Conference on Meteorology, Climatology and Atmospheric Physics—COMECAP 2023;2023-09-05 4. Development and Validation of an Enhanced Aerosol Product for Aeolus (L2A+);16th International Conference on Meteorology, Climatology and Atmospheric Physics—COMECAP 2023;2023-08-28 5. First assessment of Aeolus Standard Correct Algorithm particle backscatter coefficient retrievals in the eastern Mediterranean;Atmospheric Measurement Techniques;2023-02-28
|
|