Differential Optical Absorption Spectroscopy (DOAS)
Measurement of Volcanic SO2 Concentration in Miyakejima Using Differential Optical Absorption Spectroscopy (DOAS)
... our differential optical absorption spectroscopy (DOAS) measurements carried out inside the highly-polluted, restricted areas in Miyakejima in December 2009 and September ...horizontal ...
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Assessment of the performance of a compact concentric spectrometer system for Atmospheric Differential Optical Absorption Spectroscopy
... high optical efficiency and performance benefits over tra- ditional ...for differential optical absorption spectroscopy (DOAS) applications from LEO, GEO, HAP or ground-based ...
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An instrument for measurements of BrO with LED-based Cavity-Enhanced Differential Optical Absorption Spectroscopy
... CE- DOAS measurement spectral range was not optimized for ozone ...two DOAS instruments drops to slightly nega- tive values (around − 25 ppt on ...the DOAS evaluation, as well as an imper- fect ozone ...
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Differential optical absorption spectroscopy (DOAS) and air mass factor concept for a multiply scattering vertically inhomogeneous medium: theoretical consideration
... the DOAS equation referred to as the generalized DOAS equation, see ...generalized DOAS equation, a significant linearization error might occur if these requirements are not ...
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Extending differential optical absorption spectroscopy for limb measurements in the UV
... modified DOAS for ozone), see Fig. 4 (left panel). The values for standard DOAS (green line) are by up to 15% larger compared to the Taylor series approach (red line) or AMF modified DOAS (magenta ...
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Simultaneous Monitoring of Nitrogen Dioxide and Aerosol Concentrations with Dual Path Differential Optical Absorption Spectroscopy
... nent, A, as indicated in Equation (6). For this purpose, here we employ the DOAS AOT data at the two wave- lengths of 532 and 756 nm. Generally, smaller values of the Angstrom exponent (such as A = 0.5) indicates ...
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A new Differential Optical Absorption Spectroscopy instrument to study atmospheric chemistry from a high altitude unmanned aircraft
... limb-scanning Differential Optical Absorption Spec- troscopy (DOAS) instrument developed for NASA’s Global Hawk (GH) unmanned aerial system and deployed during the Airborne Tropical TRopopause ...
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Retrieval interval mapping: a tool to visualize the impact of the spectral retrieval range on differential optical absorption spectroscopy evaluations
... zenith-sky DOAS and BrO in tropospheric volcanic ...passive DOAS measurements us- ing scattered sunlight, allowing one to study the two differ- ent measurement conditions in direct ...
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NO 2measurements in Hong Kong using LED based long path differential optical absorption spectroscopy
... ments difficult. In order to allow better comparison with the LP-DOAS data, OMI measurements significantly influenced by clouds have to be filtered out. To get a balance between having enough measurements left and ...
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Studies of the horizontal inhomogeneities in NO2 concentrations above a shipping lane using ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements and validation with airborne imaging DOAS measurements
... Figure 1. (a) Ship traffic density map calculated from all received AIS messages (2013–2016) showing the main shipping lane from the North Sea into the Elbe river close to the measurement site on a radar tower on the ...
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Development of a portable active long-path differential optical absorption spectroscopy system for volcanic gas measurements
... Two recent technological advances have now made it pos- sible to design a lightweight portable LP-DOAS instrument. For one, the size and weight of the telescope unit can be dra- matically reduced by replacing the ...
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Comparison of tropospheric NO2 vertical columns in an urban environment using satellite, multi-axis differential optical absorption spectroscopy, and in situ measurements
... Fitting errors associated with the MAX-DOAS 1SCD are indicative of the systematic and random errors associ- ated with the QDOAS retrieval. Systematic errors include incorrect spectral calibration, dark current and ...
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Quantification and parametrization of non-linearity effects by higher-order sensitivity terms in scattered light differential optical absorption spectroscopy
... of differential opti- cal absorption spectroscopy (DOAS) of scattered light ob- servations in the presence of strong absorbers (in particular ozone), for which the absorption ...
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Two instruments based on differential optical absorption spectroscopy (DOAS) to measure accurate ammonia concentrations in the atmosphere
... laser absorption spectroscopy, photoacous- tic spectroscopy, and cavity ring down ...ferential optical absorption spectroscopy (DOAS) ...The DOAS technique has been ...
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Tropospheric nitrogen dioxide column retrieval from ground-based zenith–sky DOAS observations
... Piters, A. J. M., Boersma, K. F., Kroon, M., Hains, J. C., Van Roozendael, M., Wittrock, F., Abuhassan, N., Adams, C., Akrami, M., Allaart, M. A. F., Apituley, A., Beirle, S., Bergw- erff, J. B., Berkhout, A. J. C., ...
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The ICAD (iterative cavity-enhanced DOAS) method
... Cavity-enhanced differential optical absorption spectroscopy (CE-DOAS or BB-CEAS DOAS) allows us to make in situ measurements while maintaining the kilometre- long light paths ...
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Inherent calibration of a blue LED-CE-DOAS instrument to measure iodine oxide, glyoxal, methyl glyoxal, nitrogen dioxide, water vapour and aerosol extinction in open cavity mode
... Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) is a novel CEAS technique under development (Meinen et ...finesse optical cav- ity coupled to a broad band light ...
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Long-path averaged mixing ratios of O 3and NO2 in the free troposphere from mountain MAX-DOAS
... Multi-axis differential optical absorption spectroscopy (MAX-DOAS) has demon- strated success in obtaining profiles in polluted areas and has been used extensively for pollution studies ...
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Caution with spectroscopic NO2 reference cells (cuvettes)
... by differential optical absorption spec- troscopy (DOAS), are frequently supported by recording the trace-gas column density (CD) in absorption cells (cuvettes), which are temporarily ...
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Initial investigation of the wavelength dependence of optical properties measured with a new multi-pass Aerosol Extinction Differential Optical Absorption Spectrometer (AE-DOAS)
... An optical extinction cell (OES) was developed to measure extinction at three wavelengths (467, 530, 660 nm), but the sample path length is ...(CAPS) spectroscopy instrument has been tested at 445 and 632 ...
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