ILAS data processing for stratospheric gas and aerosol retrievals with aerosol physical modeling: Methodology and validation of gas retrievals

Oshchepkov, Sergey; Sasano, Yasuhiro; Yokota, Tatsuya; Nakajima, H.; Uemura, Nobuyuki; Saitoh, Naoko; Sugita, T.; Matsuda, Hisashi

doi:10.1029/2005jd006543

Cited by 12 publications

(17 citation statements)

References 44 publications

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“…1, along with the contributions of all interfering species. Besides the Institute of Meteorology and Climate Research/Instituto de Astrofísica de Andalucía (IMK/IAA) data product, MIPAS CFC data by ESA (Raspollini et al, 2013, validated by Engel et al, 2016, Oxford University (The University of Oxford Physics Department, 2008), Forschungszentrum Jülich (Hoffmann et al, 2008) and MIPAS Bologna Facility (Dinelli et al, 2010) also exist. Since these retrievals rely on the same measurements as our data, they are not independent and thus have not been used for comparison.…”

Section: Instrumentsmentioning

confidence: 99%

“…The cryogenic Fourier transform infrared limb sounder Michelson Interferometer for Passive Atmospheric Sounding -STRatospheric aircraft (MIPAS-STR;Piesch et al, 1996) aboard the high-altitude research aircraft M55 Geophysica is the airborne sister instrument of MIPAS. Here, we use MIPAS-STR observations during the Arctic RECONCILE campaign (Reconciliation of essential process parameters for an enhanced predictability of Arctic stratospheric ozone loss and its climate interactions; von Hobe et al, 2013) for the validation of MIPAS observations.…”

Section: Mipas-str Datamentioning

confidence: 99%

“…The retrieval is based on an onion peeling method Yokota et al (2002). Multiple parameters for gases and aerosols are derived simultaneously on a 1 km altitude grid using a least-squares fit (Oshchepkov et al, 2006).The CFC results are based on the spectrum obtained by spectrometer 1 that is fitted in its entirety. For the comparisons with MIPAS more than 5600 individual profiles are available, covering the time period from April to October 2003, and thus provide comparison measurements for the MIPAS FR period.…”

Section: Scisat/ace-fts Datamentioning

confidence: 99%

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MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability

et al. 2016

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) and were used to validate MIPAS CFC-11 and CFC-12 products during that time, as well as profiles from the Improved Limb Atmospheric Spectrometer, ILAS-II. In general, we find that MIPAS shows slightly higher values for CFC-11 at the lower end of the profiles (below ∼ 15 km) and in a comparison of HATS ground-based data and MIPAS measurements at 3 km below the tropopause. Differences range from approximately 10 to 50 pptv (∼ 5-20 %) during the RR period. In general, differences are slightly smaller for the FR period. An indication of a slight high bias at the lower end of the profile exists for CFC-12 as well, but this bias is far less pronounced than for CFC-11 and is not as obvious in the relative differences between MIPAS and any of the comparison instruments. Differences at the lower end of the profile (below ∼ 15 km) and in the comparison of HATS and MIPAS measurements taken at 3 km below the tropopause mainly stay within 10-50 pptv (corresponding to ∼ 2-10 % for CFCPublished by Copernicus Publications on behalf of the European Geosciences Union. 3356 E. Eckert et al.: MIPAS IMK/IAA CFC-11 and CFC-12: accuracy, precision and long-term stability 12) for the RR and the FR period. Between ∼ 15 and 30 km, most comparisons agree within 10-20 pptv (10-20 %), apart from ILAS-II, which shows large differences above ∼ 17 km. Overall, relative differences are usually smaller for CFC-12 than for CFC-11. For both species -CFC-11 and CFC-12 -we find that differences at the lower end of the profile tend to be larger at higher latitudes than in tropical and subtropical regions. In addition, MIPAS profiles have a maximum in their mixing ratio around the tropopause, which is most obvious in tropical mean profiles. Comparisons of the standard deviation in a quiescent atmosphere (polar summer) show that only the CFC-12 FR error budget can fully explain the observed variability, while for the other products (CFC-11 FR and RR and CFC-12 RR) only two-thirds to three-quarters can be explained. Investigations regarding the temporal stability show very small negative drifts in MIPAS CFC-11 measurements. These instrument drifts vary between ∼ 1 and 3 % decade −1 . For CFC-12, the drifts are also negative and close to zero up to ∼ 30 km. Above that altitude, larger drifts of up to ∼ 50 % decade −1 appear which are negative up to ∼ 35 km and positive, but of a similar magnitude, above.

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Section: Instrumentsmentioning

confidence: 99%

Section: Mipas-str Datamentioning

confidence: 99%

Section: Scisat/ace-fts Datamentioning

confidence: 99%

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MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability

et al. 2016

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“…The retrieval vertical grid was 1 km, which is identical to the ILAS-II. While the operational ESA data are processed with a code described by Ridolfi et al (2000), we used data from a science-oriented data processor, developed at IMK in cooperation with IAA. The data used for comparison are based on IMK spectra version V3O and are based on calibrated radiance spectra generated by offline level-1 re-processing (ESA version IPF 4.61/4.62).…”

Section: Mipasmentioning

confidence: 99%

Intercomparison of ILAS-II version 1.4 and version 2 target parameters with MIPAS-Envisat measurements

et al. 2008

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Abstract. This paper assesses the mean differences between the two ILAS-II data versions (1.4 and 2) by comparing them with MIPAS measurements made between May and October 2003. For comparison with ILAS-II results, MIPAS data processed at the Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany (IMK) in cooperation with the Instituto de Astrofísica de Andalucía (IAA) in Granada, Spain, were used. The coincidence criteria of ±300 km in space and ±12 h in time for H 2 O, N 2 O, and CH 4 and the coincidence criteria of ±300 km in space and ±6 h in time for ClONO 2 , O 3 , and HNO 3 were used. The ILAS-II data were separated into sunrise (= Northern Hemisphere) and sunset (= Southern Hemisphere). For the sunrise data, a clear improvement from version 1.4 to version 2 was observed for H 2 O, CH 4 , ClONO 2 , and O 3 . In particular, the ILAS-II version 1.4 mixing ratios of H 2 O and CH 4 were unrealistically small, and those of ClONO 2 above altitudes of 30 km unrealistically large. For N 2 O and HNO 3 , there were no large differences between the two versions. Contrary to the Northern Hemisphere, where some exceptional profiles deviated significantly from known climatology, no such outlying profiles were found in the Southern Hemisphere for both versions. Generally, the ILAS-II version 2 data were in better agreement with the MIPAS data than the version 1.4, and are recommended for quantitative analysis in the stratosphere. For H 2

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“…The first detection was by King et al (1976); for a review of early efforts to measure N 2 O 5 from the ground and balloons, see Roscoe (1991). Like ClONO 2 , stratospheric N 2 O 5 has been detected from space by ATMOS , CRISTA (Riese et al, 1997(Riese et al, , 1999, CLAES (Kumer et al, 1996b(Kumer et al, , 1997, ILAS Oshchepkov et al, 2006), and ILAS-II . In addition, ISAMS, which operated on UARS from October 1991 to July 1992, detected N 2 O 5 using pressure modulated radiometry (Taylor et al, 1993;Smith et al, 1996;Kumer et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Validation of HNO3, ClONO2, and N2O5 from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)

et al. 2008

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Published by Copernicus Publications on behalf of the European Geosciences Union. Abstract. The Atmospheric Chemistry Experiment (ACE) satellite was launched on 12 August 2003. Its two instruments measure vertical profiles of over 30 atmospheric trace gases by analyzing solar occultation spectra in the ultraviolet/visible and infrared wavelength regions. The reservoir gases HNO 3 , ClONO 2 , and N 2 O 5 are three of the key species provided by the primary instrument, the ACE Fourier Transform Spectrometer (ACE-FTS). This paper describes the ACE-FTS version 2.2 data products, including the N 2 O 5 update, for the three species and presents validation comparisons with available observations. We have compared volume mixing ratio (VMR) profiles of HNO 3 , ClONO 2 , and N 2 O 5 with measurements by other satellite instruments (SMR, MLS, MIPAS), aircraft measurements (ASUR), and single balloon-flights (SPIRALE, FIRS-2). Partial columns of HNO 3 and ClONO 2 were also compared with measurements by ground-based Fourier Transform Infrared (FTIR) spectrometers. Overall the quality of the ACE-FTS v2.2 HNO 3 VMR profiles is good from 18 to 35 km. For the statistical satellite comparisons, the mean absolute differences are generally within ±1 ppbv (±20%) from 18 to 35 km. For MI-PAS and MLS comparisons only, mean relative differences lie within ±10% between 10 and 36 km. ACE-FTS HNO 3 partial columns (∼15-30 km) show a slight negative bias of −1.3% relative to the ground-based FTIRs at latitudes ranging from 77.8 • S-76.5 • N. Good agreement between ACE-FTS ClONO 2 and MIPAS, using the Institut für Meteorologie und Klimaforschung and Instituto de Astrofísica de Andalucía (IMK-IAA) data processor is seen. Mean absolute differences are typically within ±0.01 ppbv between 16 and 27 km and less than +0.09 ppbv between 27 and 34 km. The ClONO 2 partial column comparisons show varying degrees of agreement, depending on the location and the quality of the FTIR measurements. Good agreement was found for the comparisons with the midlatitude Jungfraujoch partial columns for which the mean relative difference is 4.7%. ACE-FTS N 2 O 5 has a low bias relative to MIPAS IMK-IAA, reaching −0.25 ppbv at the altitude of the N 2 O 5 maximum (around 30 km). Mean absolute differences at lower altitudes (16-27 km) are typically −0.05 ppbv for MIPAS nighttime and ±0.02 ppbv for MIPAS daytime measurements.

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ILAS data processing for stratospheric gas and aerosol retrievals with aerosol physical modeling: Methodology and validation of gas retrievals

Cited by 12 publications

References 44 publications

MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability

MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability

Intercomparison of ILAS-II version 1.4 and version 2 target parameters with MIPAS-Envisat measurements

Validation of HNO<sub>3</sub>, ClONO<sub>2</sub>, and N<sub>2</sub>O<sub>5</sub> from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)

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ILAS data processing for stratospheric gas and aerosol retrievals with aerosol physical modeling: Methodology and validation of gas retrievals

Cited by 12 publications

References 44 publications

MIPAS IMK/IAA CFC-11 (CCl3F) and CFC-12 (CCl2F2) measurements: accuracy, precision and long-term stability

MIPAS IMK/IAA CFC-11 (CCl3F) and CFC-12 (CCl2F2) measurements: accuracy, precision and long-term stability

Intercomparison of ILAS-II version 1.4 and version 2 target parameters with MIPAS-Envisat measurements

Validation of HNO&lt;sub&gt;3&lt;/sub&gt;, ClONO&lt;sub&gt;2&lt;/sub&gt;, and N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)

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MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability

MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability

Validation of HNO<sub>3</sub>, ClONO<sub>2</sub>, and N<sub>2</sub>O<sub>5</sub> from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)