Results 41 to 50 of about 690,046 (203)

Study of NO₂ and HCHO vertical profile measurement based on fast synchronous multi-axis differential optical absorption spectroscopy (FS MAX-DOAS) [PDF]

Atmospheric Measurement Techniques
This study investigates a multi-elevation fast synchronous multi-axis differential optical absorption spectroscopy (FS MAX-DOAS) observation system that can rapidly acquire trace gas profiles.
J. Xu, J. Xu, A. Li, Z. Hu, H. Zhang, H. Zhang, M. Qin   +6 more
doaj   +1 more source

BOREAS – a new MAX-DOAS profile retrieval algorithm for aerosols and trace gases [PDF]

Atmospheric Measurement Techniques, 2018
Abstract. We present a new MAX-DOAS profiling algorithm for aerosols and trace gases, BOREAS, which utilizes an iterative solution method including Tikhonov regularization and the optimal estimation technique. The aerosol profile retrieval is based on a novel approach in which the absorption depth of O4 is directly used in order to retrieve extinction ...
T. Bösch, V. Rozanov, A. Richter, E. Peters, E. Peters, A. Rozanov, F. Wittrock, A. Merlaud, J. Lampel, J. Lampel, S. Schmitt, M. de Haij, S. Berkhout, B. Henzing, A. Apituley, M. den Hoed, J. Vonk, M. Tiefengraber, M. Tiefengraber, M. Müller, M. Müller, J. P. Burrows   +21 more
openaire   +4 more sources

Assessment of the NO₂ Spatio-Temporal Variability over Thessaloniki, Greece, Using MAX-DOAS Measurements and Comparison with S5P/TROPOMI Observations

Applied Sciences, 2023
In this article, we investigate the spatio-temporal variability of tropospheric NO2 Vertical Column Densities (VCDs) and surface concentrations that were retrieved using Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements over
Dimitris Karagkiozidis, Maria-Elissavet Koukouli, Alkiviadis Bais, Dimitris Balis, Paraskevi Tzoumaka   +4 more
doaj   +1 more source

Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan [PDF]

Atmospheric Measurement Techniques, 2015
Coincident aerosol observations of multi-axis differential optical absorption spectroscopy (MAX-DOAS), cavity ring-down spectroscopy (CRDS), lidar, and sky radiometer were conducted in Tsukuba, Japan, on 5–18 October 2010. MAX-DOAS aerosol retrieval (for
H. Irie, T. Nakayama, A. Shimizu, A. Yamazaki, T. Nagai, A. Uchiyama, Y. Zaizen, S. Kagamitani, Y. Matsumi   +8 more
doaj   +1 more source

A simple and versatile cloud-screening method for MAX-DOAS retrievals [PDF]

Atmospheric Measurement Techniques, 2014
Abstract. We present a cloud-screening method based on differential optical absorption spectroscopy (DOAS) measurements, more specifically using zenith sky spectra and O4 differential slant-column densities (DSCDs). Using the colour index (CI), i.e. the ratio of the radiance at two wavelengths, we define different sky conditions including clear, thin ...
C. Gielen, M. Van Roozendael, F. Hendrick, G. Pinardi, T. Vlemmix, V. De Bock, H. De Backer, C. Fayt, C. Hermans, D. Gillotay, P. Wang   +10 more
openaire   +4 more sources

MAX-DOAS O4 measurements: A new technique to derive information on atmospheric aerosols. (II) Modelling studies

, 2006
A new retrieval algorithm for the determination of aerosol properties using Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements based on nonlinear optimal estimation is presented.
Rozanov, A., Monks, P., Sinreich, R., P. S. Monks (7603757), T. Wagner (3822295), Monks, P. S., R. Sinreich (7615427), J. J. Remedios (7582316), U. Platt, T. Wagner, U. Platt (7615430), Frieß, F., U. Frieß (7603772), Remedios, J., Wagner, T., Platt, U., P. S. Monks, J. J. Remedios, A. Rozanov, R. Sinreich, U. Frieß, Remedios, J. J., A. Rozanov (7615424)   +22 more
core   +1 more source

Intercomparison of MAX-DOAS, FTIR and direct sun HCHO vertical columns at Xianghe, China [PDF]

Atmospheric Measurement Techniques
MAX-DOAS (Multi-AXis Differential Optical Absorption Spectroscopy), direct sun DOAS (DS) and FTIR (Fourier Transform InfraRed) measurements are considered nowadays as reference data for the validation of HCHO satellite observations.
G. Pinardi, M. M. Friedrich, C. Vigouroux, B. Langerock, I. De Smedt, C. Fayt, C. Hermans, S. Beirle, T. Wagner, M. Zhou, M. Zhou, M. Zhou, T. Wang, P. Wang, M. De Mazière, M. Van Roozendael   +15 more
doaj   +1 more source

MAX-DOAS observations of ship emissions in the North Sea

Marine Pollution Bulletin
Shipping emissions were measured in Dunkirk, France. Elevated aerosol extinction coefficients (AEC), nitrogen dioxide (NO2) and sulphur dioxide (SO2) were observed up to 500 m from surface. Formaldehyde (HCHO) did not show an increase every time, which suggests that oxidation of emitted volatile organic compounds (VOCs) took longer than the transport ...
Mahajan, Anoop, Tinel, Liselotte, Riffault, Véronique, Guilbaud, Sarah, D’anna, Barbara, Cuevas, Carlos, Saiz-Lopez, Alfonso   +6 more
openaire   +4 more sources

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China [PDF]

Atmospheric Chemistry and Physics, 2017
Ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) and lidar measurements were performed in Shanghai, China, during May 2016 to investigate the vertical distribution of summertime atmospheric pollutants.
C. Xing, C. Xing, C. Liu, C. Liu, C. Liu, C. Liu, C. Liu, S. Wang, K. L. Chan, Y. Gao, X. Huang, W. Su, C. Zhang, Y. Dong, G. Fan, T. Zhang, Z. Chen, Q. Hu, H. Su, H. Su, Z. Xie, Z. Xie, Z. Xie, Z. Xie, J. Liu, J. Liu   +25 more
doaj   +1 more source

Continuous multi-component MAX-DOAS observations for the planetary boundary layer ozone variation analysis at Chiba and Tsukuba, Japan, from 2013 to 2019

Progress in Earth and Planetary Science, 2021
Ground-based remote sensing using multi-axis differential optical absorption spectroscopy (MAX-DOAS) was used to conduct continuous simultaneous observations of ozone (O3), nitrogen dioxide (NO2), and formaldehyde (HCHO) concentrations at Chiba (35.63° N,
Hitoshi Irie, Daichi Yonekawa, Alessandro Damiani, Hossain Mohammed Syedul Hoque, Kengo Sudo, Syuichi Itahashi   +5 more
doaj   +1 more source