Simultaneous measurement of atmospheric CH2O, O3, and NO2 by differential optical absorption

Platt, U.; Perner, D.; Pätz, H.‐W.

doi:10.1029/jc084ic10p06329

Cited by 478 publications

(214 citation statements)

References 27 publications

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“…The slope of the linear regression is used to calculate σ of a HCHO absorption line line at 308.1034 nm as a reference using the high resolution of the HR-DOAS ( λ=2.7 pm). A value of 6.08×10 −21 cm 2 for the same line was reported earlier by (Neuroth, 1991;Brandenburger et al, 1998) who also used a BB-DOAS instrument for calibration, but it was based on a different absorption cross section (Platt et al, 1979) and they had a lower resolution. Including the down-scaling effect (factor = 0.729) of the MCST detection method we found an effective differential absorption cross section for the HCHO absorption line marked in Fig.…”

Section: High Resolution Hcho Cross Section At 308 Nmsupporting

confidence: 63%

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Brauers¹,

Bossmeyer²,

Dorn³

et al. 2007

Atmos. Chem. Phys.

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Abstract.The results from a simulation chamber study on the formaldehyde (HCHO) absorption cross section in the UV spectral region are presented. We performed 4 experiments at ambient HCHO concentrations with simultaneous measurements of two DOAS instruments in the atmosphere simulation chamber SAPHIR in Jülich. The two instruments differ in their spectral resolution, one working at 0.2 nm (broad-band, BB-DOAS), the other at 2.7 pm (high-resolution, HR-DOAS). Both instruments use dedicated multi reflection cells to achieve long light path lengths of 960 m and 2240 m, respectively, inside the chamber. During two experiments HCHO was injected into the clean chamber by thermolysis of well defined amounts of paraformaldehyde reaching mixing rations of 30 ppbV at maximum. The HCHO concentration calculated from the injection and the chamber volume agrees with the BB-DOAS measured value when the absorption cross section of Meller and Moortgat (2000) and the temperature coefficient of Cantrell (1990) were used for data evaluation. In two further experiments we produced HCHO in-situ from the ozone + ethene reaction which was intended to provide an independent way of HCHO calibration through the measurements of ozone and ethene. However, we found an unexpected deviation from the current understanding of the ozone + ethene reaction when CO was added to suppress possible oxidation of ethene by OH radicals. The reaction of the Criegee intermediate with CO could be 240 times slower than currently assumed. Based on the BB-DOAS measurements we could deduce a high-resolution cross section for HCHO which was not measured directly so far.

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Section: High Resolution Hcho Cross Section At 308 Nmsupporting

confidence: 63%

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Brauers¹,

Bossmeyer²,

Dorn³

et al. 2007

Atmos. Chem. Phys.

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“…The DOAS technique (Platt et al, 1979) is widely used for many applications. During the campaign a DOAS unit was operated by Chalmers from a Dauphin helicopter (Berg et al, 2012;Beecken et al, 2014).…”

Section: Doasmentioning

confidence: 99%

Field test of available methods to measure remotely SOx and NOx emissions from ships

et al. 2014

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Abstract. Methods for the determination of ship fuel sulphur content and NO x emission factors based on remote measurements have been compared in the harbour of Rotterdam and compared to direct stack emission measurements on the ferry Stena Hollandica. The methods were selected based on a review of the available literature on ship emission measurements. They were either optical (LIDAR, Differential Optical Absorption Spectroscopy (DOAS), UV camera), combined with model-based estimates of fuel consumption, or based on the so called "sniffer" principle, where SO 2 or NO x emission factors are determined from simultaneous measurement of the increase of CO 2 and SO 2 or NO x concentrations in the plume of the ship compared to the background. The measurements were performed from stations at land, from a boat and from a helicopter. Mobile measurement platforms were found to have important advantages compared to the land-based ones because they allow optimizing the sampling conditions and sampling from ships on the open sea. Although optical methods can provide reliable results it was found that at the state of the art level, the "sniffer" approach is the most convenient technique for determining both SO 2 and NO x emission factors remotely. The average random error on the determination of SO 2 emission factors comparing two identical instrumental set-ups was 6 %. However, it was found that apparently minor differences in the instrumental characteristics, such as response time, could cause significant differences between the emission factors determined. Direct stack measurements showed that about 14 % of the fuel sulphur content was not emitted as SO 2 . This was supported by the remote measurements and is in agreement with the results of other field studies.

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“…In the UV-visible region, this method is widely used for monitoring urban pollutants [1,2], e.g. ozone, nitrogen dioxide, benzene, toluene, and sulphur dioxide, and also for determining the amounts of trace constituents (e.g.…”

Section: Introductionmentioning

confidence: 99%

Absorption cross-sections of atmospheric constituents: NO2, O2, and H2O

Hermans

Vandaele

Carleer

et al. 1999

Environ. Sci. & Pollut. Res.

130

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Absorption spectroscopy, which is widely used for concentration measurements of tropospheric and stratospheric compounds, requires precise values of the absorption cross-sections of the measured species. NO v 02 and its collision-induced absorption spectrum, and H20 absorption cross-sections have been measured at temperature and pressure conditions prevailing in the Earth's atmosphere. Corrections to the generally accepted analysis procedures used to resolve the convolution problem are also proposed.

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Simultaneous measurement of atmospheric CH₂O, O₃, and NO₂ by differential optical absorption

Cited by 478 publications

References 27 publications

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Field test of available methods to measure remotely SO<sub>x</sub> and NO<sub>x</sub> emissions from ships

Absorption cross-sections of atmospheric constituents: NO2, O2, and H2O

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Simultaneous measurement of atmospheric CH2O, O3, and NO2 by differential optical absorption

Cited by 478 publications

References 27 publications

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Field test of available methods to measure remotely SO&lt;sub&gt;x&lt;/sub&gt; and NO&lt;sub&gt;x&lt;/sub&gt; emissions from ships

Absorption cross-sections of atmospheric constituents: NO2, O2, and H2O

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About

Simultaneous measurement of atmospheric CH₂O, O₃, and NO₂ by differential optical absorption

Field test of available methods to measure remotely SO<sub>x</sub> and NO<sub>x</sub> emissions from ships