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Showing 1 to 10 of 10 for “"MAX-DOAS"”.
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Physics Guided Machine Learning algorithm for MAX-DOAS retrieval
… Differential Optical Absorption Spectroscopy (MAX-DOAS) is a passive remote sensing technique that has been widely used to derive aerosol extinction coefficient profiles and trace gas concentrations. The ill-posed nature of the MAX-DOAS inversion problem makes it almost impossible to design an …
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Evaluation and Application of Max-DOAS Methods for Monitoring Aerosols, NO2, and SO2 in Urban and Industrial Environments
… Differential Optical Absorption Spectroscopy (MAX-DOAS) techniques allow a diversity of applications for studying atmospheric species, including the determination of emissions, vertical profiles, and the tropospheric column loading of trace gases. Deployment of the MAX-DOAS instrument during …
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A General Observational Strategy for Validation of Satellite NO₂ Retrievals using Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS)
… Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements at regular azimuth angle intervals on an hourly basis to validate satellite based DOAS measurements. Off-Axis MAX-DOAS Measurements taken in Blacksburg, Virginia, between November 2021 and April 2022 with an evenly distributed …
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Remote Sensing of the Lower Atmosphere: From Surface Concentration to Mixing Layer Height
Differential Optical Absorption Spectroscopy (DOAS) is a remote sensing technique to detect different trace gas concentrations in the atmosphere. The Multi Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements by the Pandora instrument scan the sky at different elevation angles …
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The Measurement of Atmospheric Species with Absorptions Close to the Actinic Flux Cut-Off by Active & MAX-DOAS: Chlorine Monoxide (CIO) & Sulphur Dioxide (SO2)
… of differential optical absorption spectroscopy (DOAS). In particular, we seek to determine whether this trace gas is present in any appreciable amount in ambient air during the wintertime owing to the widespread application of road salt. The study was performed at The Centre for Atmospheric …
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Analysis of Trace Gas Heterogeneity using In-Situ and Remote Sensing Measurement Techniques
Differential Optical Absorption Spectroscopy (DOAS) is a remote sensing spectroscopic technique capable of retrieving vertical column densities of trace gases in the atmosphere. While the technique can be used to retrieve vertical profiles of trace gases this retrieval is not applicable to …
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Retrieval of trace gases vertical profile in the lower atmosphere combining. Differential Optical Absorption Spectroscopy with radiative transfer models
… Differential Optical Absorption Spectroscopy (MAX-DOAS), is a recent technique that represents a significant advance on the well-established DOAS, especially for what it concerns the study of tropospheric trace consituents. NO2 is an important trace gas in the lower troposphere due to the fact …
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Halogen Oxide Studies in the Boundary Layer by Multi Axis Differential Optical Absorption Spectroscopy and Active Longpath-DOAS
… boundary layer were performed by ground-based MAX-DOAS, which was developed within this work. The measurements at the Hudson Bay represent the southernmost and first direct observations of Arctic surface ozone losses due to BrO and allowed for the first time to study the day and nighttime …
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Volcanic Gas Studies by Multi Axis Differential Absorption Spectroscopy
… this thesis, measurements by ground based Mini-MAX DOAS systems were carried out to study gas emissions from eight volcanoes. Bromine monoxide (BrO), chlorine monoxide (ClO), chlorine dioxide (OClO), formaldehyde (HCHO) and sulphur dioxide (SO2) abundances were measured. A global volcanic BrO …
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Studies of Atmospheric Ozone and Related Constituents in the Arctic and at Mid-latitudes
… UV-visible differential absorption spectroscopy (DOAS) ground-based spectrometers (GBSs) were installed at the Polar Environment Atmospheric Research Laboratory (PEARL) in the Canadian High Arctic (80.1o N, 86.4o W). These two instruments have been used to measure stratospheric trace gases since …