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

M. K. Ejiri; Y. Terao; T. Sugita; H. Nakajima; T. Yokota; G. C. Toon; B. Sen; G. Wetzel; H. Oelhaf; J. Urban; D. Murtagh; H. Irie; N. Saitoh; T. Tanaka; H. Kanzawa; M. Shiotani; S. Aoki; G. Hashida; T. Machida; T. Nakazawa; H. Kobayashi; Y. Sasano

doi:10.1029/2005JD006449

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

M. K. Ejiri, Y. Terao, T. Sugita, H. Nakajima, T. Yokota, G. C. Toon, B. Sen, G. Wetzel, H. Oelhaf, J. Urban, D. Murtagh, H. Irie, N. Saitoh, T. Tanaka, H. Kanzawa, M. Shiotani, S. Aoki, G. Hashida, T. Machida, T. NakazawaH. Kobayashi, Y. Sasano

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Abstract

This study assesses polar stratospheric nitrous oxide (N₂O) and methane (CH₄) data from the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the Advanced Earth Observing Satellite-II (ADEOS-II) retrieved by the Version 1.4 retrieval algorithm. The data were measured between January and October 2003. Vertical profiles of ILAS-II volume mixing ratio (VMR) data are compared with data from two balloon-borne instruments, the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B) and the MkIV instrument, as well as with two satellite sensors, the Odin Sub-Millimetre Radiometer (SMR) for N₂O and the Halogen Occultation Experiment (HALOE) for CH₄. Relative percentage differences between the ILAS-II and balloon/satellite data and their median values are calculated in 10-ppbv-wide bins for N₂O (from 0 to 400 ppbv) and in 0.05-ppmv-wide bins for CH₄ (from 0 to 2 ppmv) in order to assess systematic differences between the ILAS-II and balloon/satellite data. According to this study, the characteristics of the ILAS-II Version 1.4 N₂O and CH₄ data differ between hemispheres. For ILAS-II N₂O VMR larger than 250 ppbv, the ILAS-II N₂O agrees with the balloon/SMR N₂O within ±20% in both hemispheres. The ILAS-II N₂O in the VMR range from 30-50 to 250 ppbv (corresponding to altitudes of ∼17-30 km in the Northern Hemisphere (NH, mainly outside the polar vortex) and ∼13-21 km in the Southern Hemisphere (SH, mainly inside the polar vortex) is smaller by ∼10-30% than the balloon/SMR N₂O. For ILAS-II N₂O VMR smaller than 30 ppbv (>∼21 km) in the SH, the differences between the ILAS-H and SMR N₂O are within ±10 ppbv. For ILAS-II CH₄ VMR larger than 1 ppmv (<∼25 km), the ILAS-II CH₄ agrees with the balloon/HALOE CH₄ within ±5% in the NH. For ILAS-II CH₄ VMR larger than 0.3 ppmv in SH, the ILAS-II CH₄ is ∼9% larger than the HALOE CH₄; note that this positive systematic difference between the ILAS-II and HALOE CH₄ has a seasonal dependence. Also note that the ILAS-II N₂O for its VMR smaller than 50 ppbv (>∼30 km) and the ILAS-II CH₄ for its VMR smaller than 1 ppmv (>∼25 km) only in the NH, are abnormally small compared to the balloon/satellite data.

Original language	English
Article number	D22S90
Journal	Journal of Geophysical Research Atmospheres
Volume	111
Issue number	22
DOIs	https://doi.org/10.1029/2005JD006449
Publication status	Published - 2006 Nov 27
Externally published	Yes

ASJC Scopus subject areas

Geophysics
Oceanography
Forestry
Aquatic Science
Ecology
Water Science and Technology
Soil Science
Geochemistry and Petrology
Earth-Surface Processes
Atmospheric Science
Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)
Palaeontology

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Ejiri, M. K., Terao, Y., Sugita, T., Nakajima, H., Yokota, T., Toon, G. C., Sen, B., Wetzel, G., Oelhaf, H., Urban, J., Murtagh, D., Irie, H., Saitoh, N., Tanaka, T., Kanzawa, H., Shiotani, M., Aoki, S., Hashida, G., Machida, T., ... Sasano, Y. (2006). Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profiles. Journal of Geophysical Research Atmospheres, 111(22), [D22S90]. https://doi.org/10.1029/2005JD006449

Ejiri, MK, Terao, Y, Sugita, T, Nakajima, H, Yokota, T, Toon, GC, Sen, B, Wetzel, G, Oelhaf, H, Urban, J, Murtagh, D, Irie, H, Saitoh, N, Tanaka, T, Kanzawa, H, Shiotani, M, Aoki, S, Hashida, G, Machida, T, Nakazawa, T, Kobayashi, H & Sasano, Y 2006, 'Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profiles', Journal of Geophysical Research Atmospheres, vol. 111, no. 22, D22S90. https://doi.org/10.1029/2005JD006449

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title = "Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profiles",

abstract = "This study assesses polar stratospheric nitrous oxide (N2O) and methane (CH4) data from the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the Advanced Earth Observing Satellite-II (ADEOS-II) retrieved by the Version 1.4 retrieval algorithm. The data were measured between January and October 2003. Vertical profiles of ILAS-II volume mixing ratio (VMR) data are compared with data from two balloon-borne instruments, the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B) and the MkIV instrument, as well as with two satellite sensors, the Odin Sub-Millimetre Radiometer (SMR) for N2O and the Halogen Occultation Experiment (HALOE) for CH4. Relative percentage differences between the ILAS-II and balloon/satellite data and their median values are calculated in 10-ppbv-wide bins for N2O (from 0 to 400 ppbv) and in 0.05-ppmv-wide bins for CH4 (from 0 to 2 ppmv) in order to assess systematic differences between the ILAS-II and balloon/satellite data. According to this study, the characteristics of the ILAS-II Version 1.4 N2O and CH4 data differ between hemispheres. For ILAS-II N2O VMR larger than 250 ppbv, the ILAS-II N2O agrees with the balloon/SMR N2O within ±20% in both hemispheres. The ILAS-II N2O in the VMR range from 30-50 to 250 ppbv (corresponding to altitudes of ∼17-30 km in the Northern Hemisphere (NH, mainly outside the polar vortex) and ∼13-21 km in the Southern Hemisphere (SH, mainly inside the polar vortex) is smaller by ∼10-30% than the balloon/SMR N2O. For ILAS-II N2O VMR smaller than 30 ppbv (>∼21 km) in the SH, the differences between the ILAS-H and SMR N2O are within ±10 ppbv. For ILAS-II CH4 VMR larger than 1 ppmv (<∼25 km), the ILAS-II CH4 agrees with the balloon/HALOE CH4 within ±5% in the NH. For ILAS-II CH4 VMR larger than 0.3 ppmv in SH, the ILAS-II CH4 is ∼9% larger than the HALOE CH4; note that this positive systematic difference between the ILAS-II and HALOE CH4 has a seasonal dependence. Also note that the ILAS-II N2O for its VMR smaller than 50 ppbv (>∼30 km) and the ILAS-II CH4 for its VMR smaller than 1 ppmv (>∼25 km) only in the NH, are abnormally small compared to the balloon/satellite data.",

author = "Ejiri, {M. K.} and Y. Terao and T. Sugita and H. Nakajima and T. Yokota and Toon, {G. C.} and B. Sen and G. Wetzel and H. Oelhaf and J. Urban and D. Murtagh and H. Irie and N. Saitoh and T. Tanaka and H. Kanzawa and M. Shiotani and S. Aoki and G. Hashida and T. Machida and T. Nakazawa and H. Kobayashi and Y. Sasano",

year = "2006",

month = nov,

day = "27",

doi = "10.1029/2005JD006449",

language = "English",

volume = "111",

journal = "Journal of Geophysical Research: Space Physics",

issn = "0148-0227",

number = "22",

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TY - JOUR

T1 - Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profiles

AU - Ejiri, M. K.

AU - Terao, Y.

AU - Sugita, T.

AU - Nakajima, H.

AU - Yokota, T.

AU - Toon, G. C.

AU - Sen, B.

AU - Wetzel, G.

AU - Oelhaf, H.

AU - Urban, J.

AU - Murtagh, D.

AU - Irie, H.

AU - Saitoh, N.

AU - Tanaka, T.

AU - Kanzawa, H.

AU - Shiotani, M.

AU - Aoki, S.

AU - Hashida, G.

AU - Machida, T.

AU - Nakazawa, T.

AU - Kobayashi, H.

AU - Sasano, Y.

PY - 2006/11/27

Y1 - 2006/11/27

N2 - This study assesses polar stratospheric nitrous oxide (N2O) and methane (CH4) data from the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the Advanced Earth Observing Satellite-II (ADEOS-II) retrieved by the Version 1.4 retrieval algorithm. The data were measured between January and October 2003. Vertical profiles of ILAS-II volume mixing ratio (VMR) data are compared with data from two balloon-borne instruments, the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B) and the MkIV instrument, as well as with two satellite sensors, the Odin Sub-Millimetre Radiometer (SMR) for N2O and the Halogen Occultation Experiment (HALOE) for CH4. Relative percentage differences between the ILAS-II and balloon/satellite data and their median values are calculated in 10-ppbv-wide bins for N2O (from 0 to 400 ppbv) and in 0.05-ppmv-wide bins for CH4 (from 0 to 2 ppmv) in order to assess systematic differences between the ILAS-II and balloon/satellite data. According to this study, the characteristics of the ILAS-II Version 1.4 N2O and CH4 data differ between hemispheres. For ILAS-II N2O VMR larger than 250 ppbv, the ILAS-II N2O agrees with the balloon/SMR N2O within ±20% in both hemispheres. The ILAS-II N2O in the VMR range from 30-50 to 250 ppbv (corresponding to altitudes of ∼17-30 km in the Northern Hemisphere (NH, mainly outside the polar vortex) and ∼13-21 km in the Southern Hemisphere (SH, mainly inside the polar vortex) is smaller by ∼10-30% than the balloon/SMR N2O. For ILAS-II N2O VMR smaller than 30 ppbv (>∼21 km) in the SH, the differences between the ILAS-H and SMR N2O are within ±10 ppbv. For ILAS-II CH4 VMR larger than 1 ppmv (<∼25 km), the ILAS-II CH4 agrees with the balloon/HALOE CH4 within ±5% in the NH. For ILAS-II CH4 VMR larger than 0.3 ppmv in SH, the ILAS-II CH4 is ∼9% larger than the HALOE CH4; note that this positive systematic difference between the ILAS-II and HALOE CH4 has a seasonal dependence. Also note that the ILAS-II N2O for its VMR smaller than 50 ppbv (>∼30 km) and the ILAS-II CH4 for its VMR smaller than 1 ppmv (>∼25 km) only in the NH, are abnormally small compared to the balloon/satellite data.

AB - This study assesses polar stratospheric nitrous oxide (N2O) and methane (CH4) data from the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the Advanced Earth Observing Satellite-II (ADEOS-II) retrieved by the Version 1.4 retrieval algorithm. The data were measured between January and October 2003. Vertical profiles of ILAS-II volume mixing ratio (VMR) data are compared with data from two balloon-borne instruments, the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B) and the MkIV instrument, as well as with two satellite sensors, the Odin Sub-Millimetre Radiometer (SMR) for N2O and the Halogen Occultation Experiment (HALOE) for CH4. Relative percentage differences between the ILAS-II and balloon/satellite data and their median values are calculated in 10-ppbv-wide bins for N2O (from 0 to 400 ppbv) and in 0.05-ppmv-wide bins for CH4 (from 0 to 2 ppmv) in order to assess systematic differences between the ILAS-II and balloon/satellite data. According to this study, the characteristics of the ILAS-II Version 1.4 N2O and CH4 data differ between hemispheres. For ILAS-II N2O VMR larger than 250 ppbv, the ILAS-II N2O agrees with the balloon/SMR N2O within ±20% in both hemispheres. The ILAS-II N2O in the VMR range from 30-50 to 250 ppbv (corresponding to altitudes of ∼17-30 km in the Northern Hemisphere (NH, mainly outside the polar vortex) and ∼13-21 km in the Southern Hemisphere (SH, mainly inside the polar vortex) is smaller by ∼10-30% than the balloon/SMR N2O. For ILAS-II N2O VMR smaller than 30 ppbv (>∼21 km) in the SH, the differences between the ILAS-H and SMR N2O are within ±10 ppbv. For ILAS-II CH4 VMR larger than 1 ppmv (<∼25 km), the ILAS-II CH4 agrees with the balloon/HALOE CH4 within ±5% in the NH. For ILAS-II CH4 VMR larger than 0.3 ppmv in SH, the ILAS-II CH4 is ∼9% larger than the HALOE CH4; note that this positive systematic difference between the ILAS-II and HALOE CH4 has a seasonal dependence. Also note that the ILAS-II N2O for its VMR smaller than 50 ppbv (>∼30 km) and the ILAS-II CH4 for its VMR smaller than 1 ppmv (>∼25 km) only in the NH, are abnormally small compared to the balloon/satellite data.

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

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