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RISS 인기검색어
- 검색키워드
- 저자 : Kimio Hanawa (검색결과 4 건)
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EBUCHI, NAOTO,HANAWA, KIMIO 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
Mesoscale eddies in the Kuroshio recirculation region south of Japan have been investigated by using surface current data measured by an Acoustic Doppler Current Profiler (ADCP) installed on a regular ferry shuttling between Tokyo and Chichijima, Bonin Islands, and sea surface height (SSH) anomaly derived from the TOPEX/POSEIDON altimeter. Many cyclonic and anticyclonic eddies were observed in the region. Spatial and temporal scales of the eddies were determined by lag-correlation analyses in space and time. The frequency of occurrence, temporal and spatial scales, and intensity are all nearly the same for the cyclonic and anticyclonic eddies. Phase speed of westward propagation of the eddies is estimated as 6.8 cm/s, which is faster than a theoretical estimate based on the baroclinic first-mode Rossby wave with or without a mean current. Trajectories of the eddies were also traced using SSH maps observed by the TOPER/ POSEIDON and ERS altimeters. Both the cyclozic and anticyclonic eddies propagate westward in the Kuroshio recirculation region from a region south of the Kuroshio Extension. In the region south of Shikoku and east of Kyushu, some of the eddies coalesce with the Kuroshio. It is suggested that this coalescence may trigger the path variations of the Kuroshio in the sea south of Japan.
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Surface Heat Flux and Oceanic Heat Advection in Sendai Bay
Chan Su Yang,Kimio Hanawa 大韓遠隔探査學會 2006 大韓遠隔探査學會誌 Vol.22 No.1
Coastal sea surface temperature (CSST) and meteorological data from January through December 1995 are used to estimate the net surface heat flux and heat content for Sendai Bay. The average annual surface heat flux in the area north of the bay is estimated to be +35 W m-2, whereas the southwestern area is estimated to be +56 W m-2. Therefore, the net surface heat flux shows a net gain of heat over the whole bay. The largest heat gain occurs near Matsukawaura, where the strong Kuroshio/Oyashio interaction produces anomalously cold SST and wind is more moderate than in other regions of Sendai Bay over most of the year. The lowest heat gain occurs around Tashiro Island, where the temperature difference between air and sea surface is lower and wind is stronger. The heat budget shows that both surface forcing and horizontal advection are potentially important contributors to the seasonal evolution of CSST in the bay. From the AVHRR and SeaWiFS data, it is found that offshore conditions between the bay and Eno Island are different due to the presence of the Ojika Peninsula. It is also shown that the temporal behaviors of SSTs in the bay are closely connected with the air-sea heat flux and offshore conditions.
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Surface Heat Flux and Oceanic Heat Advection in Sendai Bay
Yang Chan-Su,Hanawa Kimio The Korean Society of Remote Sensing 2006 大韓遠隔探査學會誌 Vol.22 No.1
Coastal sea surface temperature (CSST) and meteorological data from January through December 1995 are used to estimate the net surface heat flux and heat content for Sendai Bay. The average annual surface heat flux in the area north of the bay is estimated to be $+35Wm^{-2}$, whereas the southwestern area is estimated to be $+56Wm^{-2}$. Therefore, the net surface heat flux shows a net gain of heat over the whole bay. The largest heat gain occurs near Matsukawaura, where the strong Kuroshio/Oyashio interaction produces anomalously cold SST and wind is more moderate than in other regions of Sendai Bay over most of the year. The lowest heat gain occurs around Tashiro Island, where the temperature difference between air and sea surface is lower and wind is stronger. The heat budget shows that both surface forcing and horizontal advection are potentially important contributors to the seasonal evolution of CSST in the bay. From the A VHRR and SeaWiFS data, it is found that offshore conditions between the bay and Eno Island are different due to the presence of the Ojika Peninsula. It is also shown that the temporal behaviors of SSTs in the bay are closely connected with the air-sea heat flux and offshore conditions.
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ANALYSIS OF SEA SURFACE TEMPERATURE VARIABILITY IN THE COASTAL AREA OF THE NORTHEAST JAPAN
Chan Su Yang,Hitoshi Tanaka,Masaki Sawamoto,Kimio Hanawa 한국해안해양공학회 1999 학술강연회 발표논문초록집 Vol.1 No.1
Thirty-seven AVHRR images taken in the month of May from 1990 to 1994 are used to examine the sea surface temperature (SST) variability in the coastal area of the Northeast Japan. Empirical orthogonal function (EOF) analysis is adopted to study a time-series of IR images from the Sendai Bay region, to determine the dominant patterns of sea surface temperature (SST) variance in May. EOF analysis decomposed the time series into its component parts. Monthly-mean 5 images in each year are also used to make a comparison with the results of daily-image analysis. EOFs of the temporal and spatial SST variance for two kinds of image show that the dominant SST pattern is generated by spatially varying offshore water mass in the presence of the Kuroshio/Oyashio current, accounting for 95.7% (from monthly-averaged images) of the total variance. Higher modes in this area are interpreted as the result of heating and cooling of bay waters due to the interaction of offshore waters.
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