Validation of the Improved Limb Atmospheric Spectrometer‐II (ILAS‐II) Version 1.4 nitrous oxide and methane profiles

Ejiri, Mitsumu K.; Terao, Yukio; Sugita, T.; Nakajima, H.; Yokota, Tatsuya; Toon, G. C.; Sen, B.; Wetzel, G.; Oelhaf, H.; Urban, Joachim; Murtagh, Donal; Irie, Hitoshi; Saitoh, Naoko; Tanaka, Tomoaki; Kanzawa, Hiroshi; Shiotani, Masato; Aoki, Shuji; Hashida, Gen; Machida, Toshinobu; Nakazawa, Takakiyo; Kobayashi, H.; Sasano, Yasuhiro

doi:10.1029/2005jd006449

Cited by 19 publications

(26 citation statements)

References 19 publications

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“…of output signals caused by a deformation of entrance slits of the instrument (Nakajima et al, 2006a). Such results were reported by Ejiri et al (2006) and Wetzel et al (2006), in which the data were compared to the Halogen Occultation Experiment (HALOE) measurements or some balloon measurements (MIPAS-B2 and MkIV). Similarly, a negative bias for O 3 (Fig.…”

Section: Tracer Correlation and Time Seriesmentioning

confidence: 65%

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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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Section: Tracer Correlation and Time Seriesmentioning

confidence: 65%

“…21). In the ILAS-II V1.4 validation study, Ejiri et al (2006) reported that the V1.4 data are somewhat (0.1-0.2 ppmv) larger than HALOE. Thus, V2 had a better agreement with HALOE.…”

Section: Southern Hemispherementioning

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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“…Validation studies of ILAS Version 5.2 and ILAS-II Version 1.4 ozone data Sugita et al, 2006) show a good agreement with correlative measurements between 11 and 64 km and between 11 and 40 km, respectively. The validation of ILAS Version 6.1 nitrous oxide data by shows a good agreement between 10 and 40 km while ILAS-II Version 1.4 nitrous oxide data tend to be 10% lower in comparison to the Odin/SMR data and balloon-borne measurements (Ejiri et al, 2006). The latest Version 2 of ILAS-II has been improved compared to the former Version 1.4 by an improved transmittance correction in the Northern Hemisphere, by using HITRAN 2004 (Rothman et al, 2005) parameters instead of HITRAN 2000 (Rothman et al, 2003) parameters and by an improved tangent height registration (Tanaka et al, 2007).…”

Section: Ilas/ilas-iimentioning

confidence: 99%

Evaluation of CLaMS, KASIMA and ECHAM5/MESSy1 simulations in the lower stratosphere using observations of Odin/SMR and ILAS/ILAS-II

Khosrawi¹,

Müller²,

Proffitt³

et al. 2009

Atmos. Chem. Phys.

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Abstract. 1-year data sets of monthly averaged nitrous oxide (N 2 O) and ozone (O 3 ) derived from satellite measurements were used as a tool for the evaluation of atmospheric photochemical models. Two 1-year data sets, one solar occultation data set derived from the Improved Limb Atmospheric Spectrometer (ILAS and ILAS-II) and one limb sounding data set derived from the Odin Sub-Millimetre Radiometer (Odin/SMR) were employed. Here, these data sets are used for the evaluation of two Chemical Transport Models (CTMs), the Karlsruhe Simulation Model of the Middle Atmosphere (KASIMA) and the Chemical Lagrangian Model of the Stratosphere (CLaMS) as well as for one ChemistryClimate Model (CCM), the atmospheric chemistry general circulation model ECHAM5/MESSy1 (E5M1) in the lower stratosphere with focus on the Northern Hemisphere. Since the Odin/SMR measurements cover the entire hemisphere, the evaluation is performed for the entire hemisphere as well as for the low latitudes, midlatitudes and high latitudes using the Odin/SMR 1-year data set as reference. To assess the impact of using different data sets for such an evaluation study we repeat the evaluation for the polar lower stratosphere using the ILAS/ILAS-II data set. Only small differences were found using ILAS/ILAS-II instead of Odin/SMR as a reference, thus, showing that the results are not influenced by the particular satellite data set used for the evaluation. The evaluCorrespondence to: F. Khosrawi (farah@misu.su.se) ation of CLaMS, KASIMA and E5M1 shows that all models are in agreement with Odin/SMR and ILAS/ILAS-II. Differences are generally in the range of ±20%. Larger differences (up to −40%) are found in all models at 500±25 K for N 2 O mixing ratios greater than 200 ppbv, thus in air masses of tropical character. Generally, the largest differences were found for the tropics and the lowest for the polar regions. However, an underestimation of polar winter ozone loss was found both in KASIMA and E5M1 both in the Northern and Southern Hemisphere.

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“…The Improved Limb Atmospheric Spectrometer (ILAS) and ILAS-II instruments on the Advanced Earth Observing Satellite (ADEOS) and ADEOS-II, respectively, both measured N 2 O using infrared solar occultation. ILAS made measurements from September 1996 to June 1997 (Kanzawa et al, 2003;Khosrawi et al, 2004), while ILAS-II operated for eight months in 2003 (Ejiri et al, 2006;Khosrawi et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Validation of ACE-FTS N<sub>2</sub>O measurements

et al. 2008

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Abstract. The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, was launched on 12 August 2003, carrying two instruments that measure vertical profiles of atmospheric constituents using the solar occultation technique. One of these instruments, the ACE Fourier Transform Spectrometer (ACE-FTS), is measuring volume mixing ratio (VMR) profiles of nitrous oxide (N 2 O) from the upper troposphere to the lower mesosphere at a vertical resolution of about 3-4 km. In this study, the quality of the ACE-FTS version 2.2 N 2 O data is assessed through comparisons with Correspondence to: K. Strong (strong@atmosp.physics.utoronto.ca) coincident measurements made by other satellite, balloonborne, aircraft, and ground-based instruments. These consist of vertical profile comparisons with the SMR, MLS, and MIPAS satellite instruments, multiple aircraft flights of ASUR, and single balloon flights of SPIRALE and FIRS-2, and partial column comparisons with a network of groundbased Fourier Transform InfraRed spectrometers (FTIRs). Between 6 and 30 km, the mean absolute differences for the satellite comparisons lie between −42 ppbv and +17 ppbv, with most within ±20 ppbv. This corresponds to relative deviations from the mean that are within ±15%, except for comparisons with MIPAS near 30 km, for which they are as large as 22.5%. Between 18 and 30 km, the mean absolute differences for the satellite comparisons are generally Published by Copernicus Publications on behalf of the European Geosciences Union. within ±10 ppbv. From 30 to 60 km, the mean absolute differences are within ±4 ppbv, and are mostly between −2 and +1 ppbv. Given the small N 2 O VMR in this region, the relative deviations from the mean are therefore large at these altitudes, with most suggesting a negative bias in the ACE-FTS data between 30 and 50 km. In the comparisons with the FTIRs, the mean relative differences between the ACE-FTS and FTIR partial columns (which cover a mean altitude range of 14 to 27 km) are within ±5.6% for eleven of the twelve contributing stations. This mean relative difference is negative at ten stations, suggesting a small negative bias in the ACE-FTS partial columns over the altitude regions compared. Excellent correlation (R=0.964) is observed between the ACE-FTS and FTIR partial columns, with a slope of 1.01 and an intercept of −0.20 on the line fitted to the data.

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Validation of the Improved Limb Atmospheric Spectrometer‐II (ILAS‐II) Version 1.4 nitrous oxide and methane profiles

Cited by 19 publications

References 19 publications

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

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

Evaluation of CLaMS, KASIMA and ECHAM5/MESSy1 simulations in the lower stratosphere using observations of Odin/SMR and ILAS/ILAS-II

Validation of ACE-FTS N<sub>2</sub>O measurements

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Validation of the Improved Limb Atmospheric Spectrometer‐II (ILAS‐II) Version 1.4 nitrous oxide and methane profiles

Cited by 19 publications

References 19 publications

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

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

Evaluation of CLaMS, KASIMA and ECHAM5/MESSy1 simulations in the lower stratosphere using observations of Odin/SMR and ILAS/ILAS-II

Validation of ACE-FTS N&lt;sub&gt;2&lt;/sub&gt;O measurements

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Validation of ACE-FTS N<sub>2</sub>O measurements