Results 11 to 20 of about 22,657 (210)

Differential optical absorption spectroscopy (DOAS) and air mass factor concept for a multiply scattering vertically inhomogeneous medium: theoretical consideration [PDF]

open access: yesAtmospheric Measurement Techniques, 2010
The Differential Optical Absorption Spectroscopy (DOAS) technique is widely used to retrieve amounts of atmospheric species from measurements of the direct solar light transmitted through the Earth's atmosphere as well as of the solar light scattered in ...
V. V. Rozanov, A. V. Rozanov
doaj   +1 more source

A Wideband Direct Data Domain Genetic Algorithm Beamforming [PDF]

open access: yes, 2015
In this paper, a wideband direct data-domain genetic algorithm beamforming is presented. Received wideband signals are decomposed to a set of narrow sub-bands using fast Fourier transform.
Elkamchouchi, H. M., Hassan, M. M.
core   +4 more sources

Assessing the impact of clouds on ground-based UV–visible total column ozone measurements in the high Arctic [PDF]

open access: yesAtmospheric Measurement Techniques, 2019
Zenith-Sky scattered light Differential Optical Absorption Spectroscopy (ZS-DOAS) has been used widely to retrieve total column ozone (TCO). ZS-DOAS measurements have the advantage of being less sensitive to clouds than direct-sun measurements.
X. Zhao   +10 more
doaj   +1 more source

Inversion of tropospheric profiles of aerosol extinction and HCHO and NO2 mixing ratios from MAX-DOAS observations in Milano during the summer of 2003 and comparison with independent data sets [PDF]

open access: yesAtmospheric Measurement Techniques, 2011
We present aerosol and trace gas profiles derived from MAX-DOAS observations. Our inversion scheme is based on simple profile parameterisations used as input for an atmospheric radiative transfer model (forward model).
U. Platt   +11 more
doaj   +1 more source

Formaldehyde total column densities over Mexico City: comparison between multi-axis differential optical absorption spectroscopy and solar-absorption Fourier transform infrared measurements [PDF]

open access: yesAtmospheric Measurement Techniques, 2021
Formaldehyde (HCHO) total column densities over the Mexico City metropolitan area (MCMA) were retrieved using two independent measurement techniques: multi-axis differential optical absorption spectroscopy (MAX-DOAS) and Fourier transform infrared (FTIR)
C. Rivera Cárdenas   +11 more
doaj   +1 more source

Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere [PDF]

open access: yesAtmospheric Measurement Techniques, 2012
We present two Differential Optical Absorption Spectroscopy (DOAS) instruments built at RIVM: the RIVM DOAS and the miniDOAS. Both instruments provide virtually interference-free measurements of NH<sub>3</sub> concentrations in the atmosphere,
H. Volten   +9 more
doaj   +1 more source

Inversion Models for the Retrieval of Total and Tropospheric NO2 Columns

open access: yesAtmosphere, 2019
Inversion models for retrieving the total and tropospheric nitrogen dioxide ( NO 2 ) columns from spaceborne remote sensing data are presented.
Song Liu
doaj   +1 more source

Evidence for Circumburst Extinction of Gamma-Ray Bursts with Dark Optical Afterglows and Evidence for a Molecular Cloud Origin of Gamma-Ray Bursts [PDF]

open access: yes, 2002
First, we show that the gamma-ray bursts with dark optical afterglows (DOAs) cannot be explained by a failure to image deeply enough quickly enough, and argue that circumburst extinction is the most likely solution.
Price, Paul A., Reichart, Daniel E.
core   +2 more sources

Degassing at Sabancaya volcano measured by UV cameras and the NOVAC network

open access: yesVolcanica, 2019
We used low-cost Raspberry Pi ultraviolet (UV) cameras to measure sulphur dioxide (SO2) fluxes from Sabancaya volcano, Peru, during eruptive activity on 27 April 2018.
Tehnuka Ilanko   +11 more
doaj   +1 more source

An improved retrieval of tropospheric NO2 from space over polluted regions using an Earth radiance reference [PDF]

open access: yesAtmospheric Measurement Techniques, 2015
A novel tropospheric NO2 DOAS retrieval algorithm optimised for a nadir-viewing satellite instrument imaging polluted areas is proposed in this work.
J. S. Anand, P. S. Monks, R. J. Leigh
doaj   +1 more source

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