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358 results on '"Iguchi, Toshio"'

102. The Basic Performance of a Precipitation Retrieval Algorithm for the Global Precipitation Measurement Mission's Single/Dual-Frequency Radar Measurements

Author

Seto, Shinta, Iguchi, Toshio, Oki, Taikan, Seto, Shinta, Iguchi, Toshio, and Oki, Taikan

Abstract

A precipitation retrieval algorithm is proposed for the dual-frequency precipitation radar (DPR) on the core satellite of the Global Precipitation Measurement mission. The proposed algorithm is called the HB-DFR algorithm, in reference to the combination of Histchfeld-Bordan's attenuation correction method (HB method) and the dual-frequency ratio (DFR) method. The HB-DFR algorithm is tested with a synthetic DPR dataset produced from the standard product of the PR on the Tropical Rainfall Measuring Mission. Precipitation rates estimated by the HB-DFR algorithm at the lowest (near-surface) range bin are evaluated by comparing them with the corresponding values calculated from the drop size distribution of the synthetic dataset. For 'light precipitation' (below 1 mm h-1), precipitation rates are slightly underestimated because of the multiple-solution problem in the DFR method. For 'heavy precipitation' (above 10 mm h-1), the precipitation rates are severely underestimated, and the biases become large when thick liquid phase precipitation occurs. For 'medium precipitation' (between 1 and 10 mm h -1), the estimates are satisfactory. As almost 50% of precipitation falls as medium precipitation in the synthetic dataset, this result validates the usefulness of DPR measurements and the HB-DFR algorithm. Because the HB-DFR algorithm is a forward retrieval algorithm, it has multiple solutions and produces larger errors when applied to lower (farther) range bins. Unlike other dual-frequency algorithms, the HB-DFR algorithm can be easily switched to a single-frequency algorithm at a range bin where a measurement at one of the two frequencies is not available., IEEE Transactions on Geoscience and Remote Sensing, 51(12), pp.5239-5251; 2013

Published
2013

110. 400MHz帯ウィンドプロファイラおよびCOBRAを用いた融解層上層の粒径分布推定手法の開発

Author

情報通信研究機構, 宇宙航空研究開発機構, Kitamura, Yasushi, Nakagawa, Katsuhiro, Sekizawa, Shinya, Hanado, Hiroshi, Takahashi, Nobuhiro, Iguchi, Toshio, 北村, 康司, 中川, 勝広, 関澤, 信也, 花土, 弘, 高橋, 暢宏, 井口, 俊夫, 情報通信研究機構, 宇宙航空研究開発機構, Kitamura, Yasushi, Nakagawa, Katsuhiro, Sekizawa, Shinya, Hanado, Hiroshi, Takahashi, Nobuhiro, Iguchi, Toshio, 北村, 康司, 中川, 勝広, 関澤, 信也, 花土, 弘, 高橋, 暢宏, and 井口, 俊夫

Abstract

The vertical profile of raindrop size distribution (DSD) is important for understanding rain processes. To improve the accuracy of rainfall intensity observed by precipitation radar and microwave radiometers carried on satellites, the information on the vertical profile of DSD is also important. The purpose of this study is to develop a database of DSD for the satellites precipitation retrieval by using a 400MHz-band wind profiler and COBRA (CRL Okinawa Bistatic polarimetric Radar) for various kinds of hydrometer (rain, snow, and mix phase). A new algorithm is proposed above the melting layer. As a result, in the case that the spectrum peak of air motion is difficult to be found from the observed Doppler spectrum above the melting layer, it is possible that DSD can be estimated by the proposed algorithm.

Published
2007

112. An overview of the precipitation retrieval algorithm for the dual-frequency precipitation radar (DPR) on the global precipitation measurement (GPM) mission's core satellite

Author

Iguchi, Toshio, primary, Seto, Shinta, additional, Meneghini, Robert, additional, Yoshida, Naofumi, additional, Awaka, Jun, additional, Kubota, Takuji, additional, Kozu, Toshiaki, additional, Chandra, V., additional, Le, Minda, additional, Liao, Liang, additional, Tanelli, Simone, additional, and Durden, Steve, additional

Published
2012
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128. Status of development of the GPM Dual-frequency Precipitation Radar (DPR), algorithm development, and ground validation activities

Author

Kachi, Misako, primary, Miura, Takeshi, additional, Oki, Riko, additional, Shimizu, Shuji, additional, Kubota, Takuji, additional, Yoshida, Naofumi, additional, Hyakusoku, Yasutoshi, additional, Furukawa, Kinji, additional, Kojima, Masahiro, additional, Iguchi, Toshio, additional, and Nakamura, Kenji, additional

Published
2010
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133. A Kalman Filter Approach to the Global Satellite Mapping of Precipitation (GSMaP) from Combined Passive Microwave and Infrared Radiometric Data

Author

USHIO, Tomoo, primary, SASASHIGE, Kazushi, additional, KUBOTA, Takuji, additional, SHIGE, Shoichi, additional, OKAMOTO, Ken'ichi, additional, AONASHI, Kazumasa, additional, INOUE, Toshiro, additional, TAKAHASHI, Nobuhiro, additional, IGUCHI, Toshio, additional, KACHI, Misako, additional, OKI, Riko, additional, MORIMOTO, Takeshi, additional, and KAWASAKI, Zen-Ichiro, additional

Published
2009
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