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AVHRR Remote Sensing of Aerosol Microphysics in Global Scale
Higurashi, Akiko,Nakajima, Teruyuki 대한원격탐사학회 1996 International Symposium on Remote Sensing Vol.12 No.1
Satellite remote sensing of microphysical parameters of atmospheric aerosols starts drawing attention of climate community after findings of large global climate effects of aerosols (Charlson et al., 1992) and ship track trail clouds (Coakley et al., 1987). In this situation, there has been considerable effort for developing adequate remote sensing techniques of related aerosol parameters (e.g., Kaufman and Nakajima, 1993; Nakajima and Higurashi, 1996). In this paper, we study a design of retrieval scheme of microphysical parameters of aerosols from multichannel satellite imagers, such as NOAA/AVHRR, ADEOS/ OCTS and ADEOSII/GLI. In this scheme, the optical thickness and effective particle radius of aerosol can be inverted accura~ely from multi-channel analyses of radiances by an efficient look-up table algorithm (Higurashi and Nakajima, 1996; Nakajima et al., 1996) and an iterative inversion algorithm. We have applied our scheme to AVHRR radiance data to produce global map of aerosol microphysical parameters.
A Study of Aerosol and Cloud Interaction with AVHRR and ADEOS/OCTS
Nakajima, Teruyuki,Higurashi, Akiko,Kawamoto, Kazuaki 대한원격탐사학회 1997 International Symposium on Remote Sensing Vol.13 No.1
The TIROS Operational Vertical Sounder (TOVS) instrument is carried on the TIROS-N and NOAA series of satellites. This instrument has a 20 channels High Resolution Infrared Sounder (HIRS) and a 4 channels Microwave Sounding Unit (MSU). These observe the upwelling radiation from the earth and atmosphere. The physical algorithm employed in the retrieval of atmospheric temperature and moisture profiles from the observed radiation involves the computation of weighting functions and synthetic radiometric data for the HIRS and MSU channels. The algorithm is essentially a perturbation method in which guess profiles of temperature and moisture are adjusted on the basis of the differences between the calculated and observed radiances. But there are known shortcomings in the radiative transfer models which can lead to differences which adversely affect the quality of the retrievals. The tuning procedure is necessarily an attempt to ameliorate the effects of these shortcomings. In this work, we use Larrabee Strow/Hal Woolf/PauIVanDelst regression model for HIRS and MSU using FASCD3P line-by-line computation of transmittance to obtain the tuning coefficients such as gamma, bias and RMSE(Root Mean Square Error).
Study aerosol-cloud interaction phenomena from satellite remote sensing and climate modeling
Nakajima, Teruyuki,Higurashi, Akiko,Kawamoto, Kazuaki,Okamoto, Hajime,Takemura, Toshihiko,Kuroda, Shunsuke 대한원격탐사학회 1999 International Symposium on Remote Sensing Vol.15 No.1
We have analyzed AVHRR global data set for obtaining aerosol and cloud microphysical parameters, i. e., optical thickness and size index of particle polydispersions. From the results, it is found that the cloud optical thickness increases with increasing aerosol column number, which seems to be caused mainly by decreasing cloud particle radius. The cloud liquid water path was observed to be relatively constant without a significant dependence on the aerosol number. Further comparison of the satellite results with a general circulation model simulation.
Estimation of total mass of Asian dust particle in the atmosphere observed in a Nimbus-7/CZCS scene
Fukushima, Hajime,Nakajima, Teruyuki,Noguchi, Toshimitsu,Ohta, Sachio,Tabata, Hidekazu,Toratani, Mitsuhiro 대한원격탐사학회 1996 International Symposium on Remote Sensing Vol.12 No.1
The paper first calculates optical properties of Asian dust (KOSA) particles, based ou the measured refractive index of the dust particles sampled at Chinese desert area, and on the size distribution derived froth ground-level sky radiance observation under KOSA event. The calculation tapes non-sphericity of the particles into account by introducing semi-empirical correction factor. As a model aerosol, mixture of maritime and Asian dust aerosols with variable mixture ratio is assumed. A scheme for Nimbus-7/CZCS data is developed to calculate pixel-wise mixture ratio assuming constant sub-surface water reflectances at two particular wavelengths. The proposed scheme is then applied to a typical KOSA-contaminated CZCS scene to estimate the total mass of Asian dust particles in the observed air mass. The paper also compares the derived estimate with the existing estimates of daily KOSA flue at various ground observation sites.
Annual variation of observational results by sky radiometer in central Japan
Endoh, Tatsuo,Aoki, Kazuma,Ohta, Sachio,Nakajima, Teruyuki 대한원격탐사학회 1997 International Symposium on Remote Sensing Vol.13 No.1
To verify the optical data from satellite ADEOS, some surface observations have been performed over Japan islands. Series of continuous observations were carried out by means of sky radiometers in central Japan at Nigata and Tukuba from May 1994 to December 1996. Some remarked enhancements of optical thickness were observed in every Spring at both sites. These enhancements are considered to be caused by extended layer aloft of Asian dust aerosol(KOSA or yellow sand) transported over Japan island.