海洋理工学会誌
Online ISSN : 2188-3262
Print ISSN : 1341-2752
ISSN-L : 1341-2752
2 巻 , 1 号
選択された号の論文の7件中1~7を表示しています
原著
  • 諏訪 純, 野村 聡子, 杉森 康宏, 趙 朝方
    1996 年 2 巻 1 号 p. 1-16
    発行日: 1996年
    公開日: 2019/02/16
    ジャーナル フリー
    水平移流を考慮し,エントレインメント流速を水平流速の鉛直シアのみでパラメータ化する3 次元DIM(DynamicInstabilityModel)により,旧南方定点周辺海域における,台風9019号接近前 後(1990年9月15日~9月21日)の混合層深度と水温変化のシミュレートを試みた。観測データと しては,OMLETの観測の一環として,旧南方定点を中心とした一辺30kmの三角形の頂点に設置 された表面係留系と,中心の気象庁のブイによる水温・流速・気象などの連続観測データを用い た。リチャードソン数Rvについては.Rv=0.65~0.70の場合に,観測結果とシミュレーション結 果が最もよく一致した。この海域における,台風9019号接近前後の水平移流の効果は,混合層深 度の変化に対しては,鉛直一次元過程と同様に重要であるが,混合層水温の変化に対しては,鉛 直一次元過程ほど重要ではないことが示された。
  • 趙 朝方, Masatoshi Akiyama, Mingxia He, 杉森 康宏
    1996 年 2 巻 1 号 p. 17-22
    発行日: 1996年
    公開日: 2019/02/16
    ジャーナル フリー
    In this study, JERS-1 synthetic aperture radar (SAR) images of the ocean surface are processed and compared with data from the Ocean Data Buoy Stations operated by the Japan Meteorological Agency (JMA). In spite of the low signal-to-noise ratio of JERS-1/SAR data due to the low trans mission power, the present results indicate it is possible to detect ocean waves in high sea state (Hs > 2m). The relationship between the wave length derived from JERS-1/SAR data and the signifi cant wave period from the ocean data buoy stations is consistent with the linear dispersion relation in deep water.
  • 坂本 亘, 荒井 修亮, 荒川 純平
    1996 年 2 巻 1 号 p. 23-30
    発行日: 1996年
    公開日: 2019/02/16
    ジャーナル フリー
    The calcareous skeletons of many invertebrates contain micro-growth banding patterns. The clam lays down weak micro-growth bands in the shell. The clams were cultivated under three different immersed conditions and band patterns in the shell were statistically compared. The group A was immersed except at semi-diurnal low tide, group B was out in air at lowest sea level in high tide and group C was kept always below sea surface throughout the experiment. No numerical difference was found in the growth band number between the shell. All clams subjected to a 66 minute period seich in the band as well as semi-diurnal and diurnal tidal periods.
  • 木下 秀樹, 道田 豊, 西田 英男, 寄高 博行
    1996 年 2 巻 1 号 p. 31-38
    発行日: 1996年
    公開日: 2019/02/16
    ジャーナル フリー
    To improve the geoid profile in the region south of Japan as accurate enough to detect geostrophic currents, oceanographic observations along the ground tracks of TOPEX/POSEIDON including CTD casts and an IES (Inverted Echo Sounder) measurement at a point south off the Kuroshio were carried out for the period from November 1992 to May 1994. It is suggested that the warm water off the Kuroshio south of Cape Ashizuri piled up in November 1993, when the travel time observed with IES was shorter than other period. By comparing the time series of IES travel time, dynamic heights calculated from CTD casts at the mooring point of IES, and altimetric sea surface heights (ASSH)obtained by TOPEX/POSEIDON, it is shown that the rela tionship between IES travel time and dynamic heights from CTD is almost linear; the correlation coefficient is about 0.99. It is also pointed out that the altimeter of TOPEX/POSEIDON accu rately observes temporal variation of the dynamic height, because ASSH and IES time series shows rather good correlation. Spatial profiles of ASSH using available geoid models, however, are not reliable enough to detect the Kuroshio paths, because mean sea surface in the MGDR (Merged Geophysical Data Record) data set distributed from the Jet Pulsesion Laboratory or other geoid models still containanacceptable error of 20 cm or more. Corrections for ASSHto determine the Kuroshio paths by satellite altimeterare madeby means of comparingASSH and dynamic heights obtained from in situ CTD. The accuracy of ASSH after correction is estimated to be less than 10cm.
  • 倉賀野 連
    1996 年 2 巻 1 号 p. 39-46
    発行日: 1996年
    公開日: 2019/02/16
    ジャーナル フリー
    We developed a method to obtain annual mean sea surface dynamic height by combining altimeter data and in situ data, and applied the method to the TOPEX / POSEIDON altimeter data for the Pacific Ocean. The result of the method made it possible to get near real-time sea surface dynamic height, which is useful to monitor sea surface currents. The JMA, who has been opera tionally producing sea surface current maps for the western North Pacific, refers the near real time sea surface dynamic height.
  • 斎藤 克弥, 藤田 真, 為石 日出生, 岩崎 寿男
    1996 年 2 巻 1 号 p. 47-57
    発行日: 1996年
    公開日: 2019/02/16
    ジャーナル フリー
    JAFIC has been using NOAA/AVHRR satellite data for fisheries (fishing ground forecast, ocean environment analysis etc.) Information of ocean color is very important for fisheries. But distinction of ocean color has individual variation. If JAFIC supplies ocean color satellite images for fisherman, we take care about data system, supply system and data quality. We developed CZCS data analysis system. And now we are developing the system of ocean color satellite data processing for OCTS data. This system is a operative system. First, we intro duce these systems. And next, we examine ocean color satellite images for fisheries information. We suggest JAFIC ocean color slice table. And we try various technique for ocean color image processing.
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