Results 21 to 30 of about 1,941 (196)

MAX-DOAS measurements of tropospheric NO₂ and HCHO in Nanjing and a comparison to ozone monitoring instrument observations [PDF]

Atmospheric Chemistry and Physics, 2019
In this paper, we present long-term observations of atmospheric nitrogen dioxide (NO2) and formaldehyde (HCHO) in Nanjing using a Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) instrument.
K. L. Chan, Z. Wang, A. Ding, K.-P. Heue, Y. Shen, J. Wang, F. Zhang, Y. Shi, N. Hao, M. Wenig   +9 more
doaj   +1 more source

Study on the measurement of isoprene by differential optical absorption spectroscopy [PDF]

Atmospheric Measurement Techniques, 2021
In this paper, the continuous online measurements of isoprene in the atmosphere have been carried out by using differential optical absorption spectroscopy (DOAS) in the band of 202.71–227.72 nm for the first time.
S. Gao, S. Gao, S. Wang, S. Wang, C. Gu, J. Zhu, R. Zhang, Y. Guo, Y. Yan, B. Zhou, B. Zhou, B. Zhou, B. Zhou   +12 more
doaj   +1 more source

A Low-Complexity ESPRIT-Based DOA Estimation Method for Co-Prime Linear Arrays

Sensors, 2016
The problem of direction-of-arrival (DOA) estimation is investigated for co-prime array, where the co-prime array consists of two uniform sparse linear subarrays with extended inter-element spacing.
Fenggang Sun, Bin Gao, Lizhen Chen, Peng Lan   +3 more
doaj   +1 more source

The tilt effect in DOAS observations [PDF]

Atmospheric Measurement Techniques, 2017
Abstract. Experience of differential atmospheric absorption spectroscopy (DOAS) shows that a spectral shift between measurement spectra and reference spectra is frequently required in order to achieve optimal fit results, while the straightforward calculation of the optical density proves inferior.
J. Lampel, J. Lampel, Y. Wang, Y. Wang, A. Hilboll, A. Hilboll, S. Beirle, H. Sihler, H. Sihler, J. Puķīte, U. Platt, U. Platt, T. Wagner   +12 more
openaire   +5 more sources

On the absolute calibration of SO₂ cameras [PDF]

Atmospheric Measurement Techniques, 2013
Sulphur dioxide emission rate measurements are an important tool for volcanic monitoring and eruption risk assessment. The SO2 camera technique remotely measures volcanic emissions by analysing the ultraviolet absorption of SO2 in a narrow spectral ...
P. Lübcke, N. Bobrowski, S. Illing, C. Kern, J. M. Alvarez Nieves, L. Vogel, J. Zielcke, H. Delgado Granados, U. Platt   +8 more
doaj   +1 more source

Parameterizing radiative transfer to convert MAX-DOAS dSCDs into near-surface box-averaged mixing ratios [PDF]

Atmospheric Measurement Techniques, 2013
We present a novel parameterization method to convert multi-axis differential optical absorption spectroscopy (MAX-DOAS) differential slant column densities (dSCDs) into near-surface box-averaged volume mixing ratios.
R. Sinreich, A. Merten, L. Molina, R. Volkamer   +3 more
doaj   +1 more source

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

Linearisation of the effects of spectral shift and stretch in DOAS analysis [PDF]

Atmospheric Measurement Techniques, 2013
Differential Optical Absorption Spectroscopy (DOAS) is a widely used method to quantify atmospheric trace gases from spectroscopic measurements. While DOAS can, in principal, be described by a linear equation system, usually nonlinearities occur, in ...
S. Beirle, H. Sihler, T. Wagner
doaj   +1 more source

Cloud and aerosol classification for 2.5 years of MAX-DOAS observations in Wuxi (China) and comparison to independent data sets [PDF]

Atmospheric Measurement Techniques, 2015
Multi-axis differential optical absorption spectroscopy (MAX-DOAS) observations of trace gases can be strongly influenced by clouds and aerosols. Thus it is important to identify clouds and characterize their properties.
Y. Wang, M. Penning de Vries, P. H. Xie, S. Beirle, S. Dörner, J. Remmers, A. Li, T. Wagner   +7 more
doaj   +1 more source

TomoSim: A Tomographic Simulator for DOAS [PDF]

, 2020
TomoSim comes as part of project ATMOS, a miniaturised DOAS tomographic atmospheric evaluation device, designed to fit a small drone. During the development of the project, it became necessary to write a simulation tool for system validation. TomoSim is the answer to this problem.
Rui Valente de Almeida, Nuno Matela, Pedro Vieira   +2 more
openaire   +3 more sources