Spectroscopic detection of COClF in the tropical and mid-latitude lower stratosphere

Rinsland, C. P.; Nassar, Ray; Boone, Christopher D.; Bernath, Peter F.; Chiou, Linda; Weisenstein, Debra K.; Mahieu, Emmanuel; Zander, Rodolphe

doi:10.1016/j.jqsrt.2006.11.013

Cited by 12 publications

(10 citation statements)

References 34 publications

(60 reference statements)

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“…COClF results from the breakdown of CCl 3 F, so it has a peak in the lower to middle stratosphere [ Kaye et al , 1991]. Retrievals of COClF involving averaged ACE‐FTS spectra were carried out by Rinsland et al [2006]; however, a routine operational retrieval has not been developed at the time of this writing. The tropical and midlatitude COClF profiles in this work were based on the Rinsland et al [2006] retrieval using ACE‐FTS measurements.…”

Section: Ace‐fts Measurements Of Chlorine‐containing Speciesmentioning

confidence: 99%

“…Retrievals of COClF involving averaged ACE‐FTS spectra were carried out by Rinsland et al [2006]; however, a routine operational retrieval has not been developed at the time of this writing. The tropical and midlatitude COClF profiles in this work were based on the Rinsland et al [2006] retrieval using ACE‐FTS measurements. Their dates and latitude zones were similar but did not exactly match the zones used for other species in this work.…”

Section: Ace‐fts Measurements Of Chlorine‐containing Speciesmentioning

confidence: 99%

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A global inventory of stratospheric chlorine in 2004

Nassar¹,

Bernath²,

Boone³

et al. 2006

J. Geophys. Res.

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Total chlorine (ClTOT) in the stratosphere has been determined using the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) measurements of HCl, ClONO₂, CH₃Cl, Ccl₄, Ccl₃F (CFC-11), Ccl₂F₂ (CFC-12), CHClF₂ (HCFC-22), Ccl₂FCClF₂ (CFC-113), CH₃CClF₂ (HCFC-142b), COClF, and ClO supplemented by data from several other sources, including both measurements and models. Separate chlorine inventories were carried out in five latitude zones (60°–82°N, 30°–60°N, 30°S–30°N, 30°–60°S, and 60°–82°S), averaging the period of February 2004 to January 2005 inclusive, when possible, to deal with seasonal variations. The effect of diurnal variation was avoided by only using measurements taken at local sunset. Mean stratospheric ClTOT values of 3.65 ppbv were determined for both the northern and southern midlatitudes (with an estimated 1σ accuracy of ±0.13 ppbv and a precision of ±0.09 ppbv), accompanied by a slightly lower value in the tropics and slightly higher values at high latitudes. Stratospheric ClTOT profiles in all five latitude zones are nearly linear with a slight positive slope in ppbv/km. Both the observed slopes and pattern of latitudinal variation can be interpreted as evidence of the beginning of a decline in global stratospheric chlorine, which is qualitatively consistent with the mean stratospheric circulation pattern and time lag necessary for transport

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Section: Ace‐fts Measurements Of Chlorine‐containing Speciesmentioning

confidence: 99%

Section: Ace‐fts Measurements Of Chlorine‐containing Speciesmentioning

confidence: 99%

A global inventory of stratospheric chlorine in 2004

Nassar¹,

Bernath²,

Boone³

et al. 2006

J. Geophys. Res.

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“…( Kellmann et al, 2012). Also COClF was measured by ACE-FTS (Rinsland et al, 2007;Fu et al, 2009). The detection of COCl 2 was particularly important since its band is situated at the same spectral position as the v 4 band of CFC-11, and not treating COCl 2 correctly in the retrieval will trigger errors in CFC-11.…”

Section: Halogenated Hydrocarbons In the Stratospherementioning

confidence: 99%

Chlorine in the stratosphere

Clarmann¹

2013

Atmósfera

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Este artículo reseña varios aspectos de los compuestos clorados presentes en la estratosfera, que incluyen tanto su papel como agentes químicos como su función de trazadores de los procesos dinámicos. En la estratosfera, el cloro reactivo se libera a partir de los clorofluorocarbonos y otros gases orgánicos que contienen cloro. La mayor parte del cloro reactivo se convierte en compuestos inertes que almacenan cloro, como ClONO 2 y HCl. La reactivación del cloro estratosférico ocurre principalmente por reacciones heterogéneas en vórtices polares invernales, en combinación con la luz solar. Los ciclos catalíticos de Cl, ClO, BrO, Cl 2 O 2 , ClO 2 y otros compuestos como NO, NO 2 , OH y HO 2 destruyen el oxígeno impar (ozono y oxígeno atómico) de la atmósfera. El ciclo del dímero de ClO es particularmente importante en la formación del agujero de ozono, mientras que en latitudes medias el HOCl tiene alguna relevancia. También los eventos de protones solares pueden alterar la química del cloro estratosférico, aunque su efecto de activación o desactivación depende de las condiciones de iluminación. La vida media atmosférica de los clorofluorocarbonos determina la disponibilidad de las sustancias que destruyen el ozono en la estratosfera y depende de la circulación de Brewer-Dobson, que a su vez establece a qué altitudes y por cuánto tiempo está expuesta una porción de aire a la fotoquímica. Por su parte, los gases orgánicos clorados pueden usarse como trazadores para estimar la edad del aire estratosférico y así examinar la circulación de Brewer-Dobson. El uso de métodos complementarios de medición ha sido esencial para ampliar nuestros conocimientos sobre los compuestos clorados en la estratosfera. El ClO se mide principalmente con métodos de percepción remota en las regiones del infrarrojo y de microondas. Las bandas del infrarrojo lejano son ideales para medir el HOCl, pero también se encuentra información sustancial en las regiones de microondas y del infrarrojo medio. El ClONO 2 se mide sólo en el infrarrojo térmico, en tanto que el HCl se puede observar en las regiones de microondas y del infrarrojo lejano y medio. Sin embargo, las bandas del HCl en el infrarrojo medio se encuentran en longitudes de onda en que la radiación de cuerpo negro a temperaturas terrestres es tan baja que el HCl sólo se puede detectar mediante la técnica de absorción solar. Los clorofluorocarbonos se miden con mayor exactitud utilizando métodos de muestreo in situ, aunque para lograr una cobertura global se requieren mediciones en el infrarrojo térmico realizadas desde satélites. En términos epistemológicos, la investigación de la química de la estratosfera y el papel específico de los compuestos clorados se ha basado en distintos conceptos científicos como el razonamiento deductivo, el falsacionismo, el razonamiento abductivo y la llamada "solución de enigmas dentro de la ciencia normal". Sin embargo, la concepción estructuralista de la visión no enunciativa de las teorías es probablemente la que mejor se aplica a la investigación de ...

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“…7). Satellite data are well suited for this exercise (Rinsland et al, 2007;Fu et al, 2009) as water vapor interferences make the detection of COClF from FTIR ground-based spectra difficult. Only ACE-FTS occultations located in the 40-50 • N latitude band have been compared with KASIMA data, which represents a set of 64 coincident points.…”

Section: Comparisons With Model Datamentioning

confidence: 99%

An approach to retrieve information on the carbonyl fluoride (COF<sub>2</sub>) vertical distributions above Jungfraujoch by FTIR multi-spectrum multi-window fitting

Duchatelet¹,

Mahieu²,

Ruhnke

et al. 2009

Atmos. Chem. Phys.

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Abstract. We present an original multi-spectrum fitting procedure to retrieve volume mixing ratio (VMR) profiles of carbonyl fluoride (COF 2 ) from ground-based high resolution Fourier transform infrared (FTIR) solar spectra. The multi-spectrum approach consists of simultaneously combining, during the retrievals, all spectra recorded consecutively during the same day and with the same resolution. Solar observations analyzed in this study with the SFIT-2 v3.91 fitting algorithm correspond to more than 2900 spectra recorded between January 2000 and December 2007 at high zenith angles, with a Fourier Transform Spectrometer operated at the high-altitude International Scientific Station of the Jungfraujoch (ISSJ, 46.5 • N latitude, 8.0 • E longitude, 3580 m altitude), Switzerland. The goal of the retrieval strategy described here is to provide information about the vertical distribution of carbonyl fluoride. The microwindows used are located in the ν 1 or in the ν 4 COF 2 infrared (IR) absorption bands. Averaging kernel and eigenvector analysis indicates that our FTIR retrieval is sensitive to COF 2 inversion between 17 and 30 km, with the major contribution to the retrieved information always coming from the measurement. Moreover, there was no significant bias between COF 2 partial columns, total columns or VMR profiles retrieved from the two bands. For each wavenumber region, a complete error budget including all identified sources has Correspondence to: P. Duchatelet (p.duchatelet@ulg.ac.be) been carefully established. In addition, comparisons of FTIR COF 2 17-30 km partial columns with KASIMA and SLIM-CAT 3-D CTMs are also presented. If we do not notice any significant bias between FTIR and SLIMCAT time series, KASIMA COF 2 17-30 km partial columns are lower of around 25%, probably due to incorrect lower boundary conditions. For each times series, linear trend estimation for the 2000-2007 time period as well as a seasonal variation study are also performed and critically discussed. For FTIR and KASIMA time series, very low COF 2 growth rates (0.4±0.2%/year and 0.3±0.2%/year, respectively) have been derived. However, the SLIMCAT data set gives a slight negative trend (−0.5±0.2%/year), probably ascribable to discontinuities in the meteorological data used by this model. We further demonstrate that all time series are able to reproduce the COF 2 seasonal cycle, which main seasonal characteristics deduced from each data set agree quite well.

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Spectroscopic detection of COClF in the tropical and mid-latitude lower stratosphere

Cited by 12 publications

References 34 publications

A global inventory of stratospheric chlorine in 2004

A global inventory of stratospheric chlorine in 2004

Chlorine in the stratosphere

An approach to retrieve information on the carbonyl fluoride (COF<sub>2</sub>) vertical distributions above Jungfraujoch by FTIR multi-spectrum multi-window fitting

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Spectroscopic detection of COClF in the tropical and mid-latitude lower stratosphere

Cited by 12 publications

References 34 publications

A global inventory of stratospheric chlorine in 2004

A global inventory of stratospheric chlorine in 2004

Chlorine in the stratosphere

An approach to retrieve information on the carbonyl fluoride (COF&lt;sub&gt;2&lt;/sub&gt;) vertical distributions above Jungfraujoch by FTIR multi-spectrum multi-window fitting

Contact Info

Product

Resources

About

An approach to retrieve information on the carbonyl fluoride (COF<sub>2</sub>) vertical distributions above Jungfraujoch by FTIR multi-spectrum multi-window fitting