Kaoru Ichikawa

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By tracking the locally strongest part of the sea-surface velocity field, which was obtained by integrating data of satellite altimeters and surface drifting buoys, we extracted the Kuroshio axis south of Japan every 10 days from October 1992 to December 2000. The obtained axes clearly express the effect of the bottom topography; three modes were observed(More)
OBJECTIVES Sleep disorders and psychological stress have become major concerns as health risks in modern Japanese society. Chronic sleep deprivation could lead to physical and mental exhaustion, which could affect the circulatory condition. In this study, we have investigated the effects of long-term sleep problems and mental health conditions on abnormal(More)
This study was conducted to evaluate the occupational health of Japanese physicians in emergency medicine. Subjects participating in this study were eighty-nine physicians working at 12 medical facilities (10 critical care emergency centers) in Japan. Participants were asked to complete a questionnaire of work conditions and to provide blood samples for(More)
A method has been developed to monitor the surface velocity field by combining repeated acoustic Doppler current profiler (ADCP) observations and satellite altimetry data. The geostrophic velocity anomaly is calculated from the sea surface height anomaly field estimated from the altimetry data by an optimal interpolation. It has been confirmed that this(More)
Although the Brown mathematical model is the standard model for waveform retracking over open oceans, due to heterogeneous surface reflections within altimeter footprints, coastal waveforms usually deviate from open ocean waveform shapes and thus cannot be directly interpreted by the Brown model. Generally, the two primary sources of heterogeneous surface(More)
The correlation between the Kuroshio and coastal sea level south of Japan has been examined using the altimetry and tide gauge data during the period 1992–2000. The sea level varies uniformly in a region bounded by the coast and the mean Kuroshio axis, which stretches for several hundred kilometers along the coast. These variations are related with the(More)
SEPLS are areas with “dynamic mosaics of habitats and land and sea uses where the harmonious interaction between people and nature maintains biodiversity while providing humans with the goods and services needed for their livelihoods, survival and well-being in a sustainable manner” (IPSI Secretariat 2015). They can be found in many parts of the world where(More)
Correlation between the Kuroshio and coastal sea level south of Japan is examined during a non-large meander period using the altimetry and tide gauge data after removing the steric height component. The sea level varies uniformly in a region bounded by the coast and the mean Kuroshio axis, which stretches for several hundreds kilometers along the coast.(More)
Wave periods estimated from satellite altimetry data behave differently from those calculated from buoy data, especially in low-wind conditions. In this paper, the geometric mean wave period is calculated from buoy data, rather than the commonly used zero-crossing wave period . The geometric mean wave period uses the fourth moment of the wave frequency(More)