SO2 absorption cross section measurement in the UV using a Fourier transform spectrometer

Vandaele, Ann Carine; Simon, P. C.; Guilmot, Jean Michel; Carleer, Michel; Colin, Réginald

doi:10.1029/94jd02187

Cited by 196 publications

(124 citation statements)

References 23 publications

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“…The SO 2 reference spectrum is derived from a high-spectral resolution laboratory spectrum of SO 2 (Vandaele et al, 1994) convolved with the spectrometer's line shape function.…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

“…Sulfur dioxide is typically the third most abundant volcanic gas , and is a trace constituent of the Earth's atmosphere, mainly present in the troposphere (Vandaele et al, 1994). It is an environmentally significant species associated with direct and indirect (acidification) damage to ecosystems (Delmelle, 2003) and is potentially harmful to human health (WHO Air quality guidelines, 2006; Hansell and Oppenheimer, 2006).…”

Section: Introductionmentioning

confidence: 99%

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SO2 loss rates in the plume emitted by Soufrière Hills volcano, Montserrat

Rodríguez

Watson

Edmonds

et al. 2008

Journal of Volcanology and Geothermal Research

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Abstract. To improve interpretation of volcanic SO 2 flux data, it is necessary to quantify and understand reactions involving SO 2 in volcanic plumes. SO 2 is lost in volcanic plumes through a number of mechanisms. Here we report SO 2 measurements made with miniature ultraviolet spectrometers at Soufrière Hills volcano, Montserrat; a low altitude volcano (~1000 m above sea level) whose plume entrains humid marine air in the planetary boundary layer. Traverses very near (<400 m) beneath the ash-free plume were made at various distances from the source (from ~2 km to ~16 km), thereby spanning plume ages of about 6 to 35 minutes with minimal attenuation. We find average SO 2 loss rates of ~10 -4 s -1 (e-folding time of ~2.78 hours), slightly lower than estimated previously for Soufrière Hills. These are in the fast end of the range of loss rates measured at other volcanoes (10 -3 -10 -7 s -1 , e-folding times of 0.28-2778 hr), indicating that Montserrat plumes have short SO 2 lifetimes. This work is more detailed and precise than previous work and is likely to represent the general case at Montserrat. SO 2 flux measurements made >2 km downwind from Soufrière Hills volcano significantly underestimate atsource SO 2 emission rates, on the order of 70-146%, when not accounting for the decay rate. Similar SO 2 loss is likely to occur in plumes from other tropical low altitude volcanoes under conditions of high relative humidity (~20% of active volcanoes worldwide). These results suggest that the global volcanic SO 2 emission rate may be underestimated as the estimates are based on measurements taken downwind of volcanoes, by which time significant loss of SO 2 may have taken place. The loss rates calculated here could be used, in conjunction with downwind SO 2 fluxes, to estimate atsource SO 2 emission rates from volcanoes with similar environmental conditions to those at Soufrière Hills volcano.3

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“…The SO 2 reference spectrum is derived from a high-spectral resolution laboratory spectrum of SO 2 (Vandaele et al, 1994) convolved with the spectrometer's line shape function.…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SO2 loss rates in the plume emitted by Soufrière Hills volcano, Montserrat

Rodríguez

Watson

Edmonds

et al. 2008

Journal of Volcanology and Geothermal Research

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“…For the SO 2 analysis, absorption cross sections of SO 2 at 294 K (Vandaele et al, 1994), O 3 at 294 K (Burrows et al, 1999) and a synthetic Ring spectrum were included . Since the literature cross sections are given in cm 2 molecule −1 we obtain column densities in molecules cm −2 and concentrations in molecules cm −3 .…”

Section: Measurement Proceduresmentioning

confidence: 99%

DOAS-measurement of the NO2 formation rate from NOx emissions into the atmosphere

et al. 2012

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Abstract. In the present work we deal with emissions originating from combustion processes containing SO 2 , NO and NO 2 , emitted into the atmosphere by a localized source. We present a method for measuring the NO 2 -formation rate (due to conversion of NO to NO 2 ) from measurements of SO 2 -and NO 2 -slant column densities across different plume sections, under the (usually justified) assumption that the SO 2 -flux is constant. The advantages of the proposed method are that the measurements can be performed from an arbitrary location, without explicit reference to the wind speed and direction in the plume. We present results of ground based DOAS-measurements of SO 2 and NO x emissions from an oil refinery located in the northern part of Montevideo Bay and give recommendations for future applications of the method.

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“…For the SO 2 fit, the spectral window of 316.5-325.5 nm was selected. Two O 3 cross sections at 293 K and 221 K, respectively , an NO 2 cross section at 293 K , the SO 2 cross section at 295 K (Vandaele et al, 1994), the HCHO cross section (Meller and Moortgat, 2000) and a ring spectrum (Vountas et al, 1998) were included in the fit. The spectral resolution of the AMAXDOAS UV spectrometer is about 0.8 nm, and all the cross sections used were convolved with the AMAXDOAS slit function prior to the fit.…”

Section: So 2 Slant Columnmentioning

confidence: 99%

Airborne multi-axis DOAS measurements of tropospheric SO2 plumes in the Po-valley, Italy

et al. 2006

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Abstract. During the second FORMAT (FORMaldehyde as A Tracer of oxidation in the troposphere) campaign in 2003 the airborne multi-axis DOAS instrument (AMAX-DOAS) performed scattered-light spectroscopic measurements of SO 2 over the city of Mantova and the power plant Porto Tolle, both situated in the Po-valley, Northern Italy. The SO 2 vertical columns and emission flux were derived from two days of measurements, 26 and 27 September 2003. The SO 2 emission flux from the power plant Porto Tolle was calculated to 1.93×10 25 molec s −1 on 26 September and in good agreement with official emission data, which quote 2.25×10 25 molec s −1 . On 27 September the measured flux was much lower (3.77×10 24 molec s −1 ) if ECMWF wind data are used, but of comparable magnitude (2.4×10 25 molec s −1 ) if the aircraft on-board wind measurements are utilised. Official emission data was 2.07×10 25 molec s −1 indicating only a small change from the previous day. Over the city of Mantova, the observed SO 2 vertical columns were 1.1×10 16 molec cm −2 and 1.9×10 16 molec cm −2 on 26 and 27 September, respectively. This is in good agreement with ground-based measurements of 5.9 ppbv and 10.0 ppbv which correspond to 1.2×10 16 molec cm −2 and 2.2×10 16 molec cm −2 if a well mixed boundary layer of 500 m altitude is assumed.

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SO₂ absorption cross section measurement in the UV using a Fourier transform spectrometer

Cited by 196 publications

References 23 publications

SO2 loss rates in the plume emitted by Soufrière Hills volcano, Montserrat

SO2 loss rates in the plume emitted by Soufrière Hills volcano, Montserrat

DOAS-measurement of the NO<sub>2</sub> formation rate from NO<sub>x</sub> emissions into the atmosphere

Airborne multi-axis DOAS measurements of tropospheric SO<sub>2</sub> plumes in the Po-valley, Italy

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SO2 absorption cross section measurement in the UV using a Fourier transform spectrometer

Cited by 196 publications

References 23 publications

SO2 loss rates in the plume emitted by Soufrière Hills volcano, Montserrat

SO2 loss rates in the plume emitted by Soufrière Hills volcano, Montserrat

DOAS-measurement of the NO&lt;sub&gt;2&lt;/sub&gt; formation rate from NO&lt;sub&gt;x&lt;/sub&gt; emissions into the atmosphere

Airborne multi-axis DOAS measurements of tropospheric SO&lt;sub&gt;2&lt;/sub&gt; plumes in the Po-valley, Italy

Contact Info

Product

Resources

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SO₂ absorption cross section measurement in the UV using a Fourier transform spectrometer

DOAS-measurement of the NO<sub>2</sub> formation rate from NO<sub>x</sub> emissions into the atmosphere

Airborne multi-axis DOAS measurements of tropospheric SO<sub>2</sub> plumes in the Po-valley, Italy