Search Results 1-20 of 539

  • Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station

    Kataoka Ryuho , Nishiyama Takanori , Tanaka Yoshimasa , Kadokura Akira , Uchida Herbert Akihito , Ebihara Yusuke , Ejiri Mitsumu K. , Tomikawa Yoshihiro , Tsutsumi Masaki , Sato Kaoru , Miyoshi Yoshizumi , Shiokawa Kazuo , Kurita Satoshi , Kasahara Yoshiya , Ozaki Mitsunori , Hosokawa Keisuke , Matsuda Shoya , Shinohara Iku , Takashima Takeshi , Sato Tatsuhiko , Mitani Takefumi , Hori Tomoaki , Higashio Nana

    … During this event, the footprint of the Arase satellite was located within the field of view of the all-sky imagers at Syowa Station in the Antarctic. … Auroral observations at Syowa Station revealed the dominant precipitation of relatively soft electrons during the auroral breakup. …

    Earth, Planets and Space (71), 2019-01-23


  • Visualization of rapid electron precipitation via chorus element wave–particle interactions

    Ozaki Mitsunori , Miyoshi Yoshizumi , Shiokawa Kazuo , Hosokawa Keisuke , Oyama Shin-ichiro , Kataoka Ryuho , Ebihara Yusuke , Ogawa Yasunobu , Kasahara Yoshiya , Yagitani Satoshi , Kasaba Yasumasa , Kumamoto Atsushi , Tsuchiya Fuminori , Matsuda Shoya , Katoh Yuto , Hikishima Mitsuru , Kurita Satoshi , Otsuka Yuichi , Moore Robert C. , Tanaka Yoshimasa , Nosé Masahito , Nagatsuma Tsutomu , Nishitani Nozomu , Kadokura Akira , Connors Martin , Inoue Takumi , Matsuoka Ayako , Shinohara Iku

    … Through in-situ measurements of chorus waveforms with the Arase satellite and transient auroral flashes from electron precipitation events as detected by 100-Hz video sampling from the ground, Earth's aurora becomes a display for the resonant interactions. …

    Nature Communications (10), 2019-01-16


  • Study of the Beam Control Method of the Ka-band Multi-beam Broadcasting Satellite System Using Meteorological Data : Evaluation of the Effectiveness of Rader AMeDAS Precipitation Data  [in Japanese]

    岩本 拓巳 , 藤崎 清孝

    映像情報メディア学会技術報告 = ITE technical report 43(2), 71-74, 2019-01

  • Seasonal Variabilities of Sea Surface Temperature and Salinity on Ibaraki Coast

    TROSELJ Josko , IMAI Yuki , NINOMIYA Junichi , MORI Nobuhito

    … <p> Downscaling coarse scale global climate models to fine coastal scales is needed to realistically reproduce natural variabilities of coastal current systems and processes subject to expected increases in global mean sea level, surface temperatures and extreme precipitation in the 21<sup>st</sup> …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_1213-I_1218, 2019



    YAMAMOTO Koichi , ASAKUMA Tomoharu , KAGAWA Hiroki , SUTIKNO Sigit , BASIR Noerdin , KANNO Ariyo

    … <p> Analysis of satellite images and field surveys revealed the actual situation of land area expansion phenomena observed on the coastal area of Bengkalis Island in Riau, Indonesia, where a peatland coast is observed. … A comparison of the number of temporary peat fan occurrences with the periodic precipitation shows that the high peat fan increases the number of temporary peat fans. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_1249-I_1254, 2019


  • Characteristics and Effects of Ground-Based GNSS Zenith Total Delay Observation Errors in the Convective-Scale Model

    KIM Eun-Hee , LEE Eunhee , LEE Seung-Woo , LEE Yong Hee

    … <p> In this study, we evaluated the impacts of the revised observation error on ground-based global navigation satellite system (GNSS) zenith total delay (ZTD) data in the data-assimilation system of the Korea Meteorological Administration's 1.5 km convective-scale model. … In addition, the quantitative precipitation forecasts were improved in all experiments using GNSS data, but the effects were minimal.</p> …

    Journal of the Meteorological Society of Japan. Ser. II 97(5), 1009-1021, 2019


  • Satellite remote sensing and hydrological sciences—Remarkably achieved satellites or sensors for hydrological sciences and global water cycle studies—  [in Japanese]

    HIGUCHI Atsushi

    Satellite observations by NOAA AVHRR series enable to monitor vegetation activities over the globe. …

    Journal of Japanese Association of Hydrological Sciences 49(2), 73-89, 2019



    SHIMOZUMA Tatsuya , SETO Shinta

    … XRAIN data that corrected using DPR data on the core satellite of the GPM mission is used in this author's previous study, we generate the extreme rainfall events. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 75(1), 122-129, 2019


  • Impact of AMSU-A Data Assimilation over High Terrains on QPFs Downstream of the Tibetan Plateau

    QIN Zhengkun , ZOU Xiaolei

    … This modification produced larger positive impacts of satellite data assimilation on the 48-h forecasts of the mid-tropospheric trough, water vapor, and quantitative precipitation forecasts downstream of the TP. … This study also suggests the importance of having AMSU-A observations from early-morning satellite orbits for numerical weather prediction downstream of the TP. …

    Journal of the Meteorological Society of Japan. Ser. II, 2019


  • Role of Coastal Convection to Moisture Buildup during the South China Sea Summer Monsoon Onset

    CHEN Wei-Ting , WU Chien-Ming , TSAI Wei-Ming , CHEN Peng-Jen , CHEN Po-Yen

    …  In this study, the climatological characteristics of object-based precipitation systems (OPSs) and moisture development are analyzed over the South China Sea (SCS) during the sharp transition of summer monsoon onset. … The satellite observed statistics of the OPSs showed that over the 20-day pre-onset period, OPSs of small (< … 300 km) OPSs develop over the coastal ocean and contribute to over 60 % of the total precipitation. …

    Journal of the Meteorological Society of Japan. Ser. II, 2019


  • GSMaP RIKEN Nowcast: Global Precipitation Nowcasting with Data Assimilation

    OTSUKA Shigenori , KOTSUKI Shunji , OHHIGASHI Marimo , MIYOSHI Takemasa

    …  Since January 2016, RIKEN has been running an extrapolation-based nowcasting system of global precipitation in real time. … The Japan Aerospace Exploration Agency's Global Satellite Mapping of Precipitation (GSMaP) Near-Real-Time product is the only input to the nowcasting system. … Motion vectors of precipitation areas are computed by a cross-correlation method, and the Local Ensemble Transform Kalman Filter generates a smooth, complete set of motion vectors. …

    Journal of the Meteorological Society of Japan. Ser. II, 2019


  • The Detection of Mesoscale Convective Systems by the GPM Ku-Band Spaceborne Radar

    WANG Jingyu , HOUZE Jr. Robert. A. , FAN Jiwen , BRODZIK Stacy. R. , FENG Zhe , HARDIN Joseph C.

    …  The Global Precipitation Measurement (GPM) core observatory satellite launched in 2014 features more extended latitudinal coverage (65°S-65°N) than its predecessor Tropical Rainfall Measuring Mission (TRMM, 35°S-35°N). … The tracking is based on geostationary satellite and ground-based Next Generation Radar (NEXRAD) network data obtained during the 2014-2016 warm seasons. …

    Journal of the Meteorological Society of Japan. Ser. II, 2019


  • Determination by MODIS satellite-based methods of recent global trends in land surface aridity and degradation

    KIMURA Reiji , MORIYAMA Masao

    … the ratio of precipitation to potential evaporation), is an indirect, essentially climatic index that has been used to identify global distributions of arid regions. … Since the turn of the century, the increasingly widespread availability of satellite data has led many researchers to use it to assess desertification. … In this study we used a satellite-based aridity index (SbAI) to investigate global changes of land surface aridity from 2000 to 2017. …

    Journal of Agricultural Meteorology 75(3), 153-159, 2019


  • High Temporal Rainfall Estimations from Himawari-8 Multiband Observations Using the Random-Forest Machine-Learning Method

    HIROSE Hitoshi , SHIGE Shoichi , YAMAMOTO Munehisa K. , HIGUCHI Atsushi

    … As training data, we use nine-band brightness temperature (BT) observations, obtained from IR radiometers, on the third-generation geostationary meteorological satellite (GEO) Himawari-8 and precipitation radar observations from the Global Precipitation Measurement core observatory. …

    Journal of the Meteorological Society of Japan. Ser. II 97(3), 689-710, 2019


  • Influence of the Temporal Resolution of Sea Surface Temperature on Winter Precipitation over the Coastal Area of the Sea of Japan

    Nosaka Masaya , Kawase Hiroaki , Sasaki Hidetaka , Murata Akihiko

    … <p>High-frequency variations are excluded in the merged satellite and in-situ data global daily sea surface temperature (MGDSST) used in weather forecasting in Japan Meteorological Agency. … We investigated the importance of temporal resolution on sea surface temperature (SST) when predicting winter precipitation using the Non-Hydrostatic Regional Climate Model. … The influence of the temporal resolution of SST on monthly precipitation is smaller than that of spatial resolution. …

    SOLA 15(0), 107-112, 2019


  • Distribution of Precipitation Depending on Synoptic Scale Disturbances with Satellite Estimate Comparisons in the Japanese Alps Area during Warm Seasons  [in Japanese]

    UENO Kenichi , SHIGE Shoichi , MITO Wataru , KANAI Ryuji , UEJI Yusuke , INAMI Akihiro , SUZUKI Keisuke , KOBAYASHI Hajime , TAMAGAWA Ichiro , YAMAMOTO Munehisa K.

    … <p> Gauge-based hourly precipitation data during the 2015-2016 warm seasons in central Japan observed with the Japan Meteorological Agency AMeDAS network and the Japanese Alps Inter-University Cooperation Project (JALPS) mountain observation network are archived. … Gauge data are compared to satellite precipitation data (GSMaP_MVK and GPM/DPR) produced by Japan Aerospace Exploration Agency. …

    Journal of Geography (Chigaku Zasshi) 128(1), 31-47, 2019


  • Multi-Year Analysis Using the NICAM-LETKF Data Assimilation System

    Terasaki Koji , Kotsuki Shunji , Miyoshi Takemasa

    … The NICAM-LETKF system assimilates conventional observations, advanced microwave sounding unit–A (AMSU-A) radiances, and global satellite mapping of precipitation (GSMaP) data. …

    SOLA 15(0), 41-46, 2019


  • Inner Structures of Snow Clouds over the Sea of Japan Observed by Instrumented Aircraft: A Review

    MURAKAMI Masataka

    … Most studies analyzed data acquired by aerological, meteorological satellite, and radar observations, or conducted numerical simulations. … Unsolved problems relating to the inner structures and precipitation mechanisms of snow clouds and the expected contributions of aircraft observations to further progress in these areas of atmospheric science are also briefly discussed.</p> …

    Journal of the Meteorological Society of Japan. Ser. II 97(1), 5-38, 2019


  • Improving a Precipitation Forecast by Assimilating All-Sky Himawari-8 Satellite Radiances: A Case of Typhoon Malakas (2016)

    Honda Takumi , Takino Shohei , Miyoshi Takemasa

    … <p>Tropical cyclones (TCs) and associated heavy precipitation have large impacts in Japan. … This study aims to find how data assimilation (DA) of every-10-minute all-sky Himawari-8 radiances could improve the quantitative precipitation forecast (QPF) for TC cases. …

    SOLA 15(0), 7-11, 2019


  • Improving a precipitation forecast by assimilating all-sky Himawari-8 satellite radiances: A case of Typhoon Malakas (2016)

    Honda Takumi , Takino Shohei , Miyoshi Takemasa

    … <p>Tropical cyclones (TCs) and associated heavy precipitation have large impacts in Japan. … This study aims to find how data assimilation (DA) of every-10-minute all-sky Himawari-8 radiances could improve the quantitative precipitation forecast (QPF) for TC cases. …

    SOLA, 2019


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