MIPAS database: new  HNO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; line parameters at  7.6  µm validated with MIPAS satellite measurements

Perrin, A.; Flaud, J.-M.; Ridolfi, Marco; Auwera, J. Vander; Carlotti, M.

doi:10.5194/amt-9-2067-2016

Cited by 16 publications

(18 citation statements)

References 35 publications

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“…The spectral window used for the MIPAS-B target parameter retrieval of CCl 4 covers the 786.0-806.0 cm −1 interval. Spectroscopic parameters for the calculation of the infrared emission spectra are a combination of the HITRAN 2008 (Rothman et al, 2009) database and the MIPAS dedicated database (Raspollini et al, 2013;Perrin et al, 2016). The CCl 4 cross sections are taken from HITRAN as in MIPAS/ESA retrievals version 7.…”

Section: Comparison With Mipas Balloonmentioning

confidence: 99%

CCl4 distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

Valeri

Barbara²,

Boone

et al. 2017

Preprint

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Abstract. Atmospheric emissions of Carbon tetrachloride CCl4 are regulated by the Montreal Protocol due to its role as a strong ozone-depleting substance. The molecule has been the subject of recent increased interest as a consequence of the so called ``mystery of CCl4,'' the discrepancy between atmospheric observations and reported production and consumption. Surface measurements of CCl4 atmospheric concentrations have declined at a rate almost three times smaller than its lifetime-limited rate, suggesting persistent atmospheric emissions despite the ban. In this paper, we study CCl4 vertical and zonal distributions in the upper troposphere and lower stratosphere (including the photolytic loss region, 70&#8211;20&#8201;hPa), its trend, and its stratospheric lifetime using measurements from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), which operated onboard the ENVISAT satellite from 2002 to 2012. Specifically, we use the MIPAS data product generated with Version 7 of the Level 2 algorithm operated by the European Space Agency. The CCl4 zonal means show features typical of long-lived species of anthropogenic origin that are destroyed primarily in the stratosphere, with larger quantities in the troposphere and a monotonic decrease with increasing altitude in the stratosphere. In the troposphere, the largest concentrations are observed at the latitudes of major industrial countries (20/50&#176;N). The good agreement we find between MIPAS CCl4 and independent measurements from other satellite and balloon-borne remote sounders proves the reliability of the MIPAS dataset. CCl4 trends are calculated as a function of both latitude and altitude. Negative trends are found at all latitudes in the upper-troposphere / lower-stratosphere region, apart from a region in the Southern mid-latitudes between 50 and 10&#8201;hPa where the trend is positive. At the lowest altitudes sounded by MIPAS, we find trends consistent with those determined on the basis of long-term ground-based measurements. For higher altitudes, the trend shows a pronounced asymmetry between Northern and Southern Hemispheres, and the magnitude of the decline rate increases with altitude. At 50&#8201;hPa the decline is about 30&#8211;35&#8201;%/decade, close to the lifetime-limited trend. We use a simplified model assuming tracer-tracer linear correlations to determine CCl4 lifetime in the lower stratosphere. The calculation provides a global average lifetime of 46(38&#8211;60) years considering CFC-11 as the reference tracer. This value is consistent with the most recent literature result of 44(36&#8211;58) years.

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Section: Comparison With Mipas Balloonmentioning

confidence: 99%

CCl4 distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

Valeri

Barbara²,

Boone

et al. 2017

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The spectral window used for the MIPAS-B target parameter retrieval of CCl 4 covers the 786.0-806.0 cm −1 interval. Spectroscopic parameters for the calculation of the infrared emission spectra are a combination of the HITRAN 2008 (Rothman et al, 2009) database and the MIPAS dedicated database Perrin et al, 2016). The CCl 4 cross sections are taken from HITRAN as in MI-PAS/ESA retrievals version 7.…”

Section: Comparison With Mipas Balloonmentioning

confidence: 99%

CCl4 distribution derived from MIPAS ESA v7 data: intercomparisons, trend, and lifetime estimation

et al. 2017

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Abstract. Atmospheric emissions of carbon tetrachloride (CCl 4 ) are regulated by the Montreal Protocol due to its role as a strong ozone-depleting substance. The molecule has been the subject of recent increased interest as a consequence of the so-called "mystery of CCl 4 ", the discrepancy between atmospheric observations and reported production and consumption. Surface measurements of CCl 4 atmospheric concentrations have declined at a rate almost 3 times lower than its lifetime-limited rate, suggesting persistent atmospheric emissions despite the ban. In this paper, we study CCl 4 vertical and zonal distributions in the upper troposphere and lower stratosphere (including the photolytic loss region, 70-20 hPa), its trend, and its stratospheric lifetime using measurements from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), which operated onboard the ENVISAT satellite from 2002 to 2012. Specifically, we use the MIPAS data product generated with Version 7 of the Level 2 algorithm operated by the European Space Agency.The CCl 4 zonal means show features typical of long-lived species of anthropogenic origin that are destroyed primarily in the stratosphere, with larger quantities in the troposphere and a monotonic decrease with increasing altitude in the stratosphere. MIPAS CCl 4 measurements have been compared with independent measurements from other satellite and balloon-borne remote sounders, showing a good agreement between the different datasets.CCl 4 trends are calculated as a function of both latitude and altitude. Negative trends of about −10 to −15 pptv decade −1 (−10 to −30 % decade −1 ) are found at all latitudes in the upper troposphere-lower stratosphere region, apart from a region in the southern midlatitudes between 50 and 10 hPa where the trend is positive with values around 5-10 pptv decade −1 (15-20 % decade −1 ). At the lowest altitudes sounded by MIPAS, we find trends consistent with those determined on the basis of long-term ground-based measurements (−10 to −13 pptv decade −1 ). For higher altitudes, the trend shows a pronounced asymmetry between the Northern and Southern hemispheres, and the magnitude of the decline rate increases with altitude. We use a simplified model assuming tracer-tracer linear correlations to determine CCl 4 lifetime in the lower stratosphere. The calculation provides a global average lifetime of 47 (39-61) years, considering CFC-11 as the reference tracer. This value is consistent with the most recent literature result of 44 (36-58) years.

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“…The retrieval scheme used in this work is based on the optimized retrieval model (ORM) (Ridolfi et al, 2000;Raspollini et al, 2006Raspollini et al, , 2013, which is the scientific prototype of the Level 2 MIPAS retrieval algorithm used by ESA to routinely process MIPAS spectra. In order to make the retrieval of phosgene from its extremely weak spectral features feasible, we have used a version of the ORM upgraded with the multitarget retrieval (MTR) functionality (Dinelli et al, 2004) and with the possibility of using the optimal estimation (OE, or maximum a posteriori likelihood) approach (Rodgers, 2000) to apply external constraints to the state vector.…”

Section: Discussionmentioning

confidence: 99%

“…Previous satellite analysis of phosgene (Toon et al, 2001;Fu et al, 2007) were carried out using the 1995 Atmospheric Trace Molecule Spectroscopy (ATMOS) linelist (Brown et al, 1996). To evaluate the difference of the new spectroscopic data with respect to the older database, we have simulated a MIPAS spectrum at 21.2 km tangent altitude for midlatitude atmospheric conditions in the 800-900 cm −1 spectral region using the mipas_pf4.45 database (Perrin et al, 2016) where the new phosgene lines have been included and repeated the simulation using the same spectroscopic database where the phosgene lines were replaced by those from the ATMOS line list. Fig.…”

Section: Spectroscopic Data Of Coclmentioning

confidence: 99%

Phosgene in the UTLS: seasonal and latitudinal variations from MIPAS observations

Valeri¹,

Carlotti²,

Flaud³

et al. 2016

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Abstract. The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is a Fourier Transform Spectrometer that measured mid-infrared atmospheric limb emission spectra from July 2002 to April 2012 on board the polar-orbiting satellite ENVISAT. We have used MIPAS data to study the latitudinal variations of phosgene (COCl2 or carbonyl chloride) and, for the first time, its seasonal variation in the upper troposphere lower stratosphere region (UTLS). Retrievals of phosgene were made using the 830–860 cm−1 region, corresponding to the ν5 bands of COCl2. Unfortunately in that region the ν4 band of CFC-11, much stronger than COCl2 ν5, hides the phosgene emission. In order to evaluate seasonality and latitudinal distribution of phosgene we have analysed all the measurements made by MIPAS in the days 18 and 20 of each month of 2008 with the Optimized Retrieval Model (ORM) recently upgraded with the Multi-Target Retrieval technique and with the Optimal Estimation functionality to apply external constraints to the state vector. Average seasonal profiles of phosgene show an evident latitudinal variability with the largest values observed in the tropical regions (maximum ≈ 35 parts per trillion by volume (pptv) at about 300 hPa). In the mid-latitude and polar regions, the volume mixing ratios (VMR) values do not exceed 30 pptv and the vertical distributions are less peaked. Our analysis highlights that COCl2 seasonal variability is fairly low, apart from the polar regions.

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MIPAS database: new HNO<sub>3</sub> line parameters at 7.6  µm validated with MIPAS satellite measurements

Cited by 16 publications

References 35 publications

CCl<sub>4</sub> distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

CCl<sub>4</sub> distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

CCl<sub>4</sub> distribution derived from MIPAS ESA v7 data: intercomparisons, trend, and lifetime estimation

Phosgene in the UTLS: seasonal and latitudinal variations from MIPAS observations

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MIPAS database: new HNO&lt;sub&gt;3&lt;/sub&gt; line parameters at 7.6 µm validated with MIPAS satellite measurements

Cited by 16 publications

References 35 publications

CCl&lt;sub&gt;4&lt;/sub&gt; distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

CCl&lt;sub&gt;4&lt;/sub&gt; distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

CCl&lt;sub&gt;4&lt;/sub&gt; distribution derived from MIPAS ESA v7 data: intercomparisons, trend, and lifetime estimation

Phosgene in the UTLS: seasonal and latitudinal variations from MIPAS observations

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Product

Resources

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MIPAS database: new HNO<sub>3</sub> line parameters at 7.6  µm validated with MIPAS satellite measurements

CCl<sub>4</sub> distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

CCl<sub>4</sub> distribution derived from MIPAS ESA V7 data: validation, trend and lifetime estimation

CCl<sub>4</sub> distribution derived from MIPAS ESA v7 data: intercomparisons, trend, and lifetime estimation