Dr. Yasuko J. Kasai Profile

Dr. Yasuko J. Kasai

Senior Researcher at NICT

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 8 November 2012 Paper

HCl/Cly ratios just before the breakup of the Antarctic vortex as observed by SMILES/MLS/ACE-FTS

T. Sugita, Y. Kasai, Y. Terao, S. Hayashida, G. Manney, W. Daffer, H. Sagawa, M. Suzuki, M. Shiotani

Proceedings Volume 8523, 85231K (2012) https://doi.org/10.1117/12.975667

KEYWORDS: Chlorine, Satellites, Stratosphere, Aerospace engineering, Atmospheric chemistry, Spectroscopy, Ozone, Temperature metrology, NOx, Data modeling

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Proceedings Article | 23 September 2009 Paper

JEM/SMILES observation capability

Yasuko Kasai, Philippe Baron, Satoshi Ochiai, Jana Mendrok, Joachim Urban, Donal Murtagh, Joakim Moller, Takeshi Manabe, Kenichi Kikuchi, Toshiyuki Nishibori

Proceedings Volume 7474, 74740S (2009) https://doi.org/10.1117/12.830825

KEYWORDS: Ozone, Error analysis, Receivers, Signal to noise ratio, Adaptive optics, Aerospace engineering, Spectroscopy, Antennas, Single sideband modulation, Statistical modeling

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Proceedings Article | 23 September 2009 Paper

Sub-millimeter wave radiometer for observation of cloud ice: a proposal for Japanese mission

Jana Mendrok, Dong Wu, Stefan Bühler, Carlos Jimenez, Yasuko Kasai

Proceedings Volume 7474, 74740T (2009) https://doi.org/10.1117/12.830704

KEYWORDS: Clouds, Particles, Sensors, Receivers, Atmospheric particles, Radiometry, Climatology, Absorption, Extremely high frequency, Satellites

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Proceedings Article | 11 December 2008 Paper

Tropospheric water vapor retrieval from a nadir THz/FIR sounder

Philippe Baron, Jana Mendrok, Eric Dupuy, Yasuko Kasai

Proceedings Volume 7149, 714909 (2008) https://doi.org/10.1117/12.806408

KEYWORDS: Temperature metrology, Troposphere, Atmospheric modeling, Error analysis, Contamination, Absorption, Infrared spectroscopy, Terahertz radiation, Mid-IR, Far infrared

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Proceedings Article | 11 December 2008 Paper

Simulations for observation of tropospheric pollutants using infrared spectroscopy from geostationary orbit

K. Sagi, E. Dupuy, K. Suzuki, P. Baron, Y. Kasai, K. Kita, R. Imasu

Proceedings Volume 7149, 714908 (2008) https://doi.org/10.1117/12.806400

KEYWORDS: Signal to noise ratio, Error analysis, Satellites, Absorption, Troposphere, Device simulation, Molecules, Infrared spectroscopy, Carbon monoxide, Pollution

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Proceedings Article | 13 October 2008 Paper

Studying the potential of terahertz radiation for deriving ice cloud microphysical information

Jana Mendrok, Philippe Baron, Yasuko Kasai

Proceedings Volume 7107, 710704 (2008) https://doi.org/10.1117/12.800262

KEYWORDS: Clouds, Terahertz radiation, Particles, Atmospheric particles, Scattering, Atmospheric optics, Absorption, Opacity, Radiative transfer, Atmospheric modeling

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Proceedings Article | 12 December 2006 Paper

Method and results of retrieval of HDO/H2O in atmosphere from IMG/ADEOS and FTIR data

A. Yu. Toptygin, K. Gribanov, V. Zakharov, Y. Kasai, A. Kagawa, Y. Murayama, R. Imasu, G. Schmidt, G. Hoffmann, J. Jouzel

Proceedings Volume 6580, 65800X (2006) https://doi.org/10.1117/12.724949

KEYWORDS: FT-IR spectroscopy, Atmospheric modeling, Transmittance, Solar radiation models, Error analysis, Spectral resolution, Spectroscopy, Atmospheric monitoring, Atmospheric sensing, Knowledge management

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Here we present a Principal Components (PCs) method of retrieval of the HDO/H₂O vertical profile using atmospheric radiances observed from space by sensor like IMG as well as atmospheric transmittance spectra observed by ground based FTIR. The method is based on the expansion of the retrieved profile on eigenvectors of covariance matrix of model profiles extracted from the isotopic Atmospheric General Circulation Model (AGCM). A priori information of covariance matrix compensates partially the lack of information containing in weighting functions for HDO in lower atmospheric layer (0-1 km) and layers above 10 km. Error estimation of the retrieval scheme was made using closed model computations with synthetic spectra ofIMG and known sets of T, H₂0, HDO profiles and its value is within 8% - 70% for vertical profile and not greater than l8% for columnar value of HDO/H20 ratio. The method was applied to IMG/ADEOS spectra measured over the ocean in clear sky conditions. Latitudinal distributions ofHDO/H20 profile and columnar HDO/H₂0 ratio are retrieved over Pacific Ocean for the time interval from winter of 1996 to summer of 1997. The retrieved HDO/H₂0 from IMG/ADEOS data and simulated with isotopic AGCM are in a good agreement. FTIR is Poker Flat high resolution ground based Fourier transform spectrometer for up-looking observation of atmosphere in the spectral range from 750-4300 cm^-1 with resolution 0.0019 cm^-1 and high signal to noise ratio. The spectrometer is located at the Poker Flat Research Range (Altitude 0.61km; latitude 65.11N; longitude 147.42W) of the Geophysical Institute at the University of Alaska Fairbanks. Poker Flat FTS is operating from 1999, observation modes are atmospheric emission and solar radiation absorption. The measured atmospheric traiismittances are supported by sonde observations of T and water vapour profiles. The HDO/H₂0 PCs retrieval method was also adapted for using the high spectral resolution atmospheric transmittances observed by FTIR. Linear regression of PCs of the HDO/H₂0 profiles was obtained in this case. Error estimation of the retrieval scheme was made using closed model computations with synthetic spectra ofthe FTIR and known sets of T, H₂0, HDO profiles and its value is within 6% - 67% for vertical profile but not greater than lO% for columnar value of HDO/H₂0 ratio. As an example, HDO/H₂0 vertical profiles were retrieved using a few samples of FTIR spectra observed at the Poker Flat Research Range from 2000 to 2004 and compared with isotope AGCM outputs for Alaska's atmosphere.

Proceedings Article | 12 December 2001 Paper

Development of superconducting submillimeter-wave limb emission sounder (JEM/SMILES) aboard the International Space Station

Hiroyuki Ozeki, Junji Inatani, Ryouta Satoh, Toshiyuki Nishibori, Naomi Ikeda, Yasunori Fujii, Takashi Nakajima, Yukiei Iida, Teruhito Iida, Ken'ichi Kikuchi, Takeshi Miura, Harunobu Masuko, Takeshi Manabe, Satoshi Ochiai, Masumichi Seta, Yoshihisa Irimajiri, Yasuko Kasai, Makoto Suzuki, Tomoko Shirai, Sho Tsujimaru, Kazuo Shibasaki, Masato Shiotani

Proceedings Volume 4540, (2001) https://doi.org/10.1117/12.450662

KEYWORDS: Antennas, Superconductors, Calibration, Receivers, Acousto-optics, Ozone, Oxides, Spectrometers, Space operations, Data processing

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