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.
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.
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.
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.
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