Abstract

The Improved Limb Atmospheric Spectrometer-II (ILAS-II) is a satellite-borne solar occultation sensor onboard the Advanced Earth Observing Satellite-II (ADEOS-II). The ILAS-II succeeded the ILAS. The ILAS-II used four grating spectrometers to observe vertical profiles of gas volume mixing ratios of trace constituents and was also equipped with a Sun-edge sensor to determine tangent heights geometrically with high precision. The accuracy of gas volume mixing ratios depends on the accuracy of the tangent height determination. The combination method is a tangent height registration method that was developed to give appropriate tangent heights for the ILAS-II Version 1.4 data retrieval algorithm. This study describes the method used in the ILAS-II Version 1.4 retrieval algorithm to register tangent heights. The root-sum-square total random error is estimated to be 30 m, and the total systematic error is 180 m at an altitude of 30 km. The influence of the tangent height errors on the vertical profiles of gas volume mixing ratios in ILAS-II Version 1.4 is estimated by using the relative difference. The relative difference for each species is within 7% (20%) for an altitude shift of ±100  m (±300  m).

© 2007 Optical Society of America

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  1. Y. Sasano, M. Suzuki, T. Yokota, and H. Kanzawa, "Improved Limb Atmospheric Spectrometer (ILAS) for stratospheric ozone layer measurements by solar occultation technique," Geophys. Res. Lett. 26, 197-200 (1999).
    [CrossRef]
  2. H. Nakajima, M. Suzuki, A. Matsuzaki, T. Ishigaki, K. Waragai, Y. Mogi, N. Kimura, N. Araki, T. Yokota, H. Kanzawa, T. Sugita, and Y. Sasano, "Characteristics and performance of the Improved Limb Atmospheric Spectrometer (ILAS) in orbit," J. Geophys. Res. 107(D24), 8213, doi:10.1029/2001JD001439 (2002).
    [CrossRef]
  3. T. Yokota, H. Nakajima, T. Sugita, H. Tsubaki, Y. Itou, M. Kaji, M. Suzuki, H. Kanzawa, J. H. Park, and Y. Sasano, "Improved Limb Atmospheric spectrometer (ILAS) data retrieval algorithm for Version 5.20 gas profile products," J. Geophys. Res. 107(D24), 8216, doi:10.1029/2001JD000628 (2002).
    [CrossRef]
  4. H. Nakajima, T. Sugita, H. Irie, N. Saitoh, H. Kanzawa, H. Oelhaf, G. Wetzel, G. C. Toon, B. Sen, J.-F. Blavier, W. A. Traub, K. Jucks, D. G. Johnson, T. Yokota, and Y. Sasano, "Measurements of ClONO2 by the Improved Limb Atmospheric Spectrometer (ILAS) in high-latitude stratosphere: new products using version 6.1 data processing algorithm," J. Geophys. Res. 111, D11S09 (2006).
    [CrossRef]
  5. Y. Sasano, T. Yokota, H. Nakajima, T. Sugita, and H. Kanzawa, "ILAS-II instrument and data processing system for stratospheric ozone layer monitoring," Proc. SPIE 4150, 106-114 (2001).
    [CrossRef]
  6. H. Nakajima, T. Sugita, T. Yokota, T. Ishigaki, Y. Mogi, N. Araki, K. Waragai, N. Kimura, T. Iwazawa, A. Kuze, J. Tanii, H. Kawasaki, M. Horikawa, T. Togami, N. Uemura, H. Kobayashi, and Y. Sasano, "Characteristics and performance of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the ADEOS-II satellite," J. Geophys. Res. 111, D11S01 (2006).
    [CrossRef]
  7. M. K. Ejiri, Y. Terao, T. Sugita, H. Nakajima, T. Yokota, G. Toon, B. Sen, G. Wetzel, H. Oelhaf, J. Urban, D. Murtagh, H. Irie, N. Saitoh, T. Tanaka, H. Kanzawa, M. Shiotani, H. Kobayashi, and Y. Sasano, "Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profile," J. Geophys. Res. 111, D22S90 (2006).
    [CrossRef]
  8. H. Irie, T. Sugita, H. Nakajima, T. Yokota, H. Oelhaf, G. Wetzel, G. C. Toon, B. Sen, M. L. Santee, Y. Terao, N. Saitoh, M. K. Ejiri, T. Tanaka, Y. Kondo, S. Hayashida, H. Kanzawa, H. Kobayashi, and Y. Sasano, "Validation of stratospheric nitric acid profiles observed by Improved Limb Atmospheric Spectrometer (ILAS)-II," J. Geophys. Res. 111, D11S03 (2006).
    [CrossRef]
  9. N. Saitoh, S. Hayashida, T. Sugita, H. Nakajima, T. Yokota, M. Hayashi, K. Shiraishi, H. Kanzawa, M. K. Ejiri, H. Irie, T. Tanaka, Y. Terao, R. M. Bevilacqua, C. E. Randall, L. W. Thomason, G. Taha, H. Kobayashi, and Y. Sasano, "Intercomparison of ILAS-II version 1.4 aerosol extinction coefficient at 780 nm with SAGE II, SAGE III, and POAM III," J. Geophys. Res. 111, D11S05 (2006).
    [CrossRef]
  10. T. Sugita, H. Nakajima, T. Yokota, H. Kanzawa, H. Gernandt, A. Herber, P. von der Gathen, G. Konig-Langlo, K. Sato, V. Dorokhov, V. A. Yushkov, Y. Murayama, M. Yamamori, S. Godin-Beekmann, F. Goutail, H. K. Roscoe, T. Deshler, M. Yela, P. Taalas, E. Kyro, S. J. Oltmans, B. J. Johnson, M. Allaart, Z. Litynska, A. Klekociuk, S. B. Andersen, G. O. Braathen, H. Dc Backer, C. E. Randall, R. M. Bevilacqua, G. Taha, L. W. Thomason, H. Irie, M. K. Ejiri, N. Saitoh, T. Tanaka, Y. Terao, H. Kobayashi, and Y. Sasano, "Ozone profiles in the high-latitude stratosphere and lower mesosphere measured by the Improved Limb Atmospheric Spectrometer (ILAS)-II: comparison with other satellite sensors and ozonesondes," J. Geophys. Res. 111, D11S02 (2006).
    [CrossRef]
  11. T. Yokota, H. Nakajima, T. Sugita, H. Kawasaki, M. Horikawa, M. Usami, N. Uemura, Y. Itou, M. Kaji, H. Kobayashi, and Y. Sasano, "Improved Limb Atmospheric Spectrometer II (ILAS-II) Version 1.4 retrieval algorithm for gas and aerosol profiles in the stratosphere" (National Institute for Environmental Studies, 2006), personal communication.
  12. H. Nakajima, M. Suzuki, T. Yokota, T. Sugita, Y. Itou, M. Kaji, N. Araki, K. Waragai, H. Yamashita, H. Kanzawa, and Y. Sasano, "Tangent height registration for the solar occultation satellite sensor ILAS: a new technique, for Version 5.20 products," J. Geophys. Res. 107(D24), 8215, doi:10.1029/2001JD000607 (2002).
    [CrossRef]

2006 (6)

H. Nakajima, T. Sugita, H. Irie, N. Saitoh, H. Kanzawa, H. Oelhaf, G. Wetzel, G. C. Toon, B. Sen, J.-F. Blavier, W. A. Traub, K. Jucks, D. G. Johnson, T. Yokota, and Y. Sasano, "Measurements of ClONO2 by the Improved Limb Atmospheric Spectrometer (ILAS) in high-latitude stratosphere: new products using version 6.1 data processing algorithm," J. Geophys. Res. 111, D11S09 (2006).
[CrossRef]

H. Nakajima, T. Sugita, T. Yokota, T. Ishigaki, Y. Mogi, N. Araki, K. Waragai, N. Kimura, T. Iwazawa, A. Kuze, J. Tanii, H. Kawasaki, M. Horikawa, T. Togami, N. Uemura, H. Kobayashi, and Y. Sasano, "Characteristics and performance of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the ADEOS-II satellite," J. Geophys. Res. 111, D11S01 (2006).
[CrossRef]

M. K. Ejiri, Y. Terao, T. Sugita, H. Nakajima, T. Yokota, G. Toon, B. Sen, G. Wetzel, H. Oelhaf, J. Urban, D. Murtagh, H. Irie, N. Saitoh, T. Tanaka, H. Kanzawa, M. Shiotani, H. Kobayashi, and Y. Sasano, "Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profile," J. Geophys. Res. 111, D22S90 (2006).
[CrossRef]

H. Irie, T. Sugita, H. Nakajima, T. Yokota, H. Oelhaf, G. Wetzel, G. C. Toon, B. Sen, M. L. Santee, Y. Terao, N. Saitoh, M. K. Ejiri, T. Tanaka, Y. Kondo, S. Hayashida, H. Kanzawa, H. Kobayashi, and Y. Sasano, "Validation of stratospheric nitric acid profiles observed by Improved Limb Atmospheric Spectrometer (ILAS)-II," J. Geophys. Res. 111, D11S03 (2006).
[CrossRef]

N. Saitoh, S. Hayashida, T. Sugita, H. Nakajima, T. Yokota, M. Hayashi, K. Shiraishi, H. Kanzawa, M. K. Ejiri, H. Irie, T. Tanaka, Y. Terao, R. M. Bevilacqua, C. E. Randall, L. W. Thomason, G. Taha, H. Kobayashi, and Y. Sasano, "Intercomparison of ILAS-II version 1.4 aerosol extinction coefficient at 780 nm with SAGE II, SAGE III, and POAM III," J. Geophys. Res. 111, D11S05 (2006).
[CrossRef]

T. Sugita, H. Nakajima, T. Yokota, H. Kanzawa, H. Gernandt, A. Herber, P. von der Gathen, G. Konig-Langlo, K. Sato, V. Dorokhov, V. A. Yushkov, Y. Murayama, M. Yamamori, S. Godin-Beekmann, F. Goutail, H. K. Roscoe, T. Deshler, M. Yela, P. Taalas, E. Kyro, S. J. Oltmans, B. J. Johnson, M. Allaart, Z. Litynska, A. Klekociuk, S. B. Andersen, G. O. Braathen, H. Dc Backer, C. E. Randall, R. M. Bevilacqua, G. Taha, L. W. Thomason, H. Irie, M. K. Ejiri, N. Saitoh, T. Tanaka, Y. Terao, H. Kobayashi, and Y. Sasano, "Ozone profiles in the high-latitude stratosphere and lower mesosphere measured by the Improved Limb Atmospheric Spectrometer (ILAS)-II: comparison with other satellite sensors and ozonesondes," J. Geophys. Res. 111, D11S02 (2006).
[CrossRef]

2002 (3)

H. Nakajima, M. Suzuki, T. Yokota, T. Sugita, Y. Itou, M. Kaji, N. Araki, K. Waragai, H. Yamashita, H. Kanzawa, and Y. Sasano, "Tangent height registration for the solar occultation satellite sensor ILAS: a new technique, for Version 5.20 products," J. Geophys. Res. 107(D24), 8215, doi:10.1029/2001JD000607 (2002).
[CrossRef]

H. Nakajima, M. Suzuki, A. Matsuzaki, T. Ishigaki, K. Waragai, Y. Mogi, N. Kimura, N. Araki, T. Yokota, H. Kanzawa, T. Sugita, and Y. Sasano, "Characteristics and performance of the Improved Limb Atmospheric Spectrometer (ILAS) in orbit," J. Geophys. Res. 107(D24), 8213, doi:10.1029/2001JD001439 (2002).
[CrossRef]

T. Yokota, H. Nakajima, T. Sugita, H. Tsubaki, Y. Itou, M. Kaji, M. Suzuki, H. Kanzawa, J. H. Park, and Y. Sasano, "Improved Limb Atmospheric spectrometer (ILAS) data retrieval algorithm for Version 5.20 gas profile products," J. Geophys. Res. 107(D24), 8216, doi:10.1029/2001JD000628 (2002).
[CrossRef]

2001 (1)

Y. Sasano, T. Yokota, H. Nakajima, T. Sugita, and H. Kanzawa, "ILAS-II instrument and data processing system for stratospheric ozone layer monitoring," Proc. SPIE 4150, 106-114 (2001).
[CrossRef]

1999 (1)

Y. Sasano, M. Suzuki, T. Yokota, and H. Kanzawa, "Improved Limb Atmospheric Spectrometer (ILAS) for stratospheric ozone layer measurements by solar occultation technique," Geophys. Res. Lett. 26, 197-200 (1999).
[CrossRef]

Geophys. Res. Lett. (1)

Y. Sasano, M. Suzuki, T. Yokota, and H. Kanzawa, "Improved Limb Atmospheric Spectrometer (ILAS) for stratospheric ozone layer measurements by solar occultation technique," Geophys. Res. Lett. 26, 197-200 (1999).
[CrossRef]

J. Geophys. Res. (9)

H. Nakajima, M. Suzuki, A. Matsuzaki, T. Ishigaki, K. Waragai, Y. Mogi, N. Kimura, N. Araki, T. Yokota, H. Kanzawa, T. Sugita, and Y. Sasano, "Characteristics and performance of the Improved Limb Atmospheric Spectrometer (ILAS) in orbit," J. Geophys. Res. 107(D24), 8213, doi:10.1029/2001JD001439 (2002).
[CrossRef]

T. Yokota, H. Nakajima, T. Sugita, H. Tsubaki, Y. Itou, M. Kaji, M. Suzuki, H. Kanzawa, J. H. Park, and Y. Sasano, "Improved Limb Atmospheric spectrometer (ILAS) data retrieval algorithm for Version 5.20 gas profile products," J. Geophys. Res. 107(D24), 8216, doi:10.1029/2001JD000628 (2002).
[CrossRef]

H. Nakajima, T. Sugita, H. Irie, N. Saitoh, H. Kanzawa, H. Oelhaf, G. Wetzel, G. C. Toon, B. Sen, J.-F. Blavier, W. A. Traub, K. Jucks, D. G. Johnson, T. Yokota, and Y. Sasano, "Measurements of ClONO2 by the Improved Limb Atmospheric Spectrometer (ILAS) in high-latitude stratosphere: new products using version 6.1 data processing algorithm," J. Geophys. Res. 111, D11S09 (2006).
[CrossRef]

H. Nakajima, T. Sugita, T. Yokota, T. Ishigaki, Y. Mogi, N. Araki, K. Waragai, N. Kimura, T. Iwazawa, A. Kuze, J. Tanii, H. Kawasaki, M. Horikawa, T. Togami, N. Uemura, H. Kobayashi, and Y. Sasano, "Characteristics and performance of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the ADEOS-II satellite," J. Geophys. Res. 111, D11S01 (2006).
[CrossRef]

M. K. Ejiri, Y. Terao, T. Sugita, H. Nakajima, T. Yokota, G. Toon, B. Sen, G. Wetzel, H. Oelhaf, J. Urban, D. Murtagh, H. Irie, N. Saitoh, T. Tanaka, H. Kanzawa, M. Shiotani, H. Kobayashi, and Y. Sasano, "Validation of the Improved Limb Atmospheric Spectrometer-II (ILAS-II) Version 1.4 nitrous oxide and methane profile," J. Geophys. Res. 111, D22S90 (2006).
[CrossRef]

H. Irie, T. Sugita, H. Nakajima, T. Yokota, H. Oelhaf, G. Wetzel, G. C. Toon, B. Sen, M. L. Santee, Y. Terao, N. Saitoh, M. K. Ejiri, T. Tanaka, Y. Kondo, S. Hayashida, H. Kanzawa, H. Kobayashi, and Y. Sasano, "Validation of stratospheric nitric acid profiles observed by Improved Limb Atmospheric Spectrometer (ILAS)-II," J. Geophys. Res. 111, D11S03 (2006).
[CrossRef]

N. Saitoh, S. Hayashida, T. Sugita, H. Nakajima, T. Yokota, M. Hayashi, K. Shiraishi, H. Kanzawa, M. K. Ejiri, H. Irie, T. Tanaka, Y. Terao, R. M. Bevilacqua, C. E. Randall, L. W. Thomason, G. Taha, H. Kobayashi, and Y. Sasano, "Intercomparison of ILAS-II version 1.4 aerosol extinction coefficient at 780 nm with SAGE II, SAGE III, and POAM III," J. Geophys. Res. 111, D11S05 (2006).
[CrossRef]

T. Sugita, H. Nakajima, T. Yokota, H. Kanzawa, H. Gernandt, A. Herber, P. von der Gathen, G. Konig-Langlo, K. Sato, V. Dorokhov, V. A. Yushkov, Y. Murayama, M. Yamamori, S. Godin-Beekmann, F. Goutail, H. K. Roscoe, T. Deshler, M. Yela, P. Taalas, E. Kyro, S. J. Oltmans, B. J. Johnson, M. Allaart, Z. Litynska, A. Klekociuk, S. B. Andersen, G. O. Braathen, H. Dc Backer, C. E. Randall, R. M. Bevilacqua, G. Taha, L. W. Thomason, H. Irie, M. K. Ejiri, N. Saitoh, T. Tanaka, Y. Terao, H. Kobayashi, and Y. Sasano, "Ozone profiles in the high-latitude stratosphere and lower mesosphere measured by the Improved Limb Atmospheric Spectrometer (ILAS)-II: comparison with other satellite sensors and ozonesondes," J. Geophys. Res. 111, D11S02 (2006).
[CrossRef]

H. Nakajima, M. Suzuki, T. Yokota, T. Sugita, Y. Itou, M. Kaji, N. Araki, K. Waragai, H. Yamashita, H. Kanzawa, and Y. Sasano, "Tangent height registration for the solar occultation satellite sensor ILAS: a new technique, for Version 5.20 products," J. Geophys. Res. 107(D24), 8215, doi:10.1029/2001JD000607 (2002).
[CrossRef]

Proc. SPIE (1)

Y. Sasano, T. Yokota, H. Nakajima, T. Sugita, and H. Kanzawa, "ILAS-II instrument and data processing system for stratospheric ozone layer monitoring," Proc. SPIE 4150, 106-114 (2001).
[CrossRef]

Other (1)

T. Yokota, H. Nakajima, T. Sugita, H. Kawasaki, M. Horikawa, M. Usami, N. Uemura, Y. Itou, M. Kaji, H. Kobayashi, and Y. Sasano, "Improved Limb Atmospheric Spectrometer II (ILAS-II) Version 1.4 retrieval algorithm for gas and aerosol profiles in the stratosphere" (National Institute for Environmental Studies, 2006), personal communication.

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Figures (5)

Fig. 1
Fig. 1

Tangent height registration geometry for the SES.

Fig. 2
Fig. 2

Edge detection using the SES method (sunrise event).

Fig. 3
Fig. 3

Position of the lower edge of the Sun as a function of date. Dashed curve indicates the boundary ( ± 3 pixels from position of no PSCs) for distinguishing the PSC scene.

Fig. 4
Fig. 4

Comparison of O 3 between the ILAS-II and the shifted tangent height ILAS-II: (a) O 3 profile of gas volume mixing ratio, (b) D values (see Section 4 for definition) between ILAS-II Version 1.4 and shifted tangent height result, and mean of individual rss error are shown.

Fig. 5
Fig. 5

N 2 O comparison between the ILAS-II and the shifted tangent height ILAS-II: (a) N 2 O profile of gas volume mixing ratio, (b) D values between ILAS-II Version 1.4 and shifted tangent height result, and mean of rss are shown.

Tables (2)

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Table 1 Error Analysis for the Tangent Height Registration

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Table 2 Absolute Values of Relative Difference | D | (%) at Each Tangent Height

Equations (1)

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D ( % ) = 100 × ( V M R ( I L A S - I I ) V M R ( shifted tanget height ) ) V M R ( I L A S - I I ) ,

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