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RISS 인기검색어
- 검색키워드
- 저자 : 김영섭(Young Seup Kim) (검색결과 67 건)
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김영섭,한영호,신수경,홍성근,KIM Young-Seup,HAN Young-Ho,SHIN Soo-Kyeong,HONG Sung-Kun 한국수산과학회 1994 한국수산과학회지 Vol.27 No.3
Characteristics of climate in the eastern coastal regions of Korean Peninsula were studied using the meteorological and coastal sea surface temperature (SST) data which were compiled from 1961 to 1990. In the winter half year (from October to March), air temperature (AT) and precipitation of the eastern coastal regions were considerably higher than those of the western and inland regions, but relative humidity was $8{\sim}15\%$ lower. AT of coastal regions was closely related to the variation of coastal SST. These characteristics were more noticeable in the eastern coastal areas and in lower latitude regions. Quantitatively, the $1.0^{\circ}C$ variation of coastal SST may have resulted in the $1.0^{\circ}C{\sim}1.5^{\circ}C$ variation for AT in coastal regions. In the same way as temperature, vapor pressure in coastal regions was also influenced by coastal SST. Relative humidity change corresponding to the $1.0^{\circ}C$ variation of coastal SST was $3.7\%{\sim}6.5\%$. Net heat exchange amounts were positive (sea surface gaining energy) in all coastal regions. Sea surface gained net heat from March to September, and lost it from October to February. Variation of AT in coastal regions was also related to the sensible and latent heat exchanges. Sensible and latent heat amount corresponding to the $1.0^{\circ}C$ variation of AT were $10Wm^{-2}$ at Kangnung, and $8Wm^{-2}$ at Pohang and $13Wm^{-2}$ at Pusan.
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김영섭,KIM Young-Seup 한국수산과학회 1996 한국수산과학회지 Vol.29 No.1
Heat flux of the East China Sea was estimated with the bulk method, the East China mount based on the marine meteorological data and cloud amount data observed by a satellite. Solar radiation is maximum in May and minimum in December. Its amount decreases gradually southward during the winter half year (from October to March), and increases northward during the summer half year (from April to September) due to the influence of Changma (Baiu) front. The spatial difference of long-wave radiation is relatively small, but its temporal difference is quite large, i.e., the value in February is about two times greater than that in July. The spatial patterns of sensible and latent heat fluxes reflect well the effect of current distribution in this region. The heat loss from the ocean surface is more than $830Wm^{-2}$ in winter, which is five times greater than the net radiation amount during the same period, The annual net heat flux is negative, which means heat loss from the sea surface, in the whole region over the East China Sea. The region with the largest loss of more than $400Wm^{-2}$ in January is observed over the southwestern Kyushu. The annual mean value of solar radiation, long-wave radiation, sensible and latent heat fluxes are estimated $187Wm^{-2},\;-52Wm^{-2},\;-30Wm^{-2}\;and\;-137Wm^{-2}$, respectively, consequently the East China Sea losses the energy of $32Wm^{-2}(2.48\times10^{13}W)$. Through the heat exchange between the air and the sea, the heat energy of $0.4\times10^{13}W$ is supplied from the air to the sea in A region (the Yellow Sea), $2.1\times10^{13}W$ in B region (the East China Sea) and $1.7\times10^{13}W$ in C region (the Kuroshio part), respectively.
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GMS-IR 자료를 이용한 서태평양에서의 운량 일변동에 관한 연구
김영섭 ( Young Seup Kim ),한경수 ( Kyung Soo Han ) 대한원격탐사학회 1997 대한원격탐사학회지 Vol.13 No.1
The western equatorial Pacific Ocean, where sea surface temperature is the warmest on the globe, is characterized by numerous convective systems and large annual precipitation. In this region, the cloudiness data with tops higher than 8 km level obtained from the GMS-IR data are used to investigate the diurnal variation of cloudiness. The amplitude and phase of diurnal and semi-diurnal cycles are mainly investigated to examine details on the temporal and spatial structure of clouds. Cloudiness variation has typical cycles and each cycle is associated with the air-sea interactive phenomena. Spectral analysis on the cloudiness time series data indicates that 30-60 day, 17-20 day, 7-8 day, diurnal and semi diurnal cycle are peaked. During Northern Winter and Southern Summer, the large cloudiness exsists over New Guinea, the adjacent seas of North Australia, and the open oceanic regions east of 160˚E. Cloudiness diurnal variability over the lands and their adjacent seas is about 2.0 times larger than that over the open sea regions. That may be due to the difference of specific heat between the land and sea. The maximum and minimum cloudiness appeared at 18:00 and 09:00 hours over the land, and at noon and 21:00 hours over the sea, respectively. The amplitude of diurnal component over the land is 4.7 times larger than that of semi-diurnal component, and 1.5 times over the sea.
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TRMM-PR/VIRS와 GMS 자료를 이용한 강수량 추정에 관한 연구
김영섭 ( Young Seup Kim ),박경원 ( Kyung Won Park ) 대한원격탐사학회 2002 대한원격탐사학회지 Vol.18 No.6
Rainfall estimation was conducted based on TRMM-PR/VIRS and GMS data. AWS rainfall data were used for various validation. General procedure is as follows; 1) Z-R relationship was made by the comparison of TRMM-PR and AWS data. 2) new algorithm was developed by the estimates from Z-R equation and TBB of VIRS. 3) rainfall was estimated through the substitution of GMS data for TBB of VIRS in the newly developed algorithm. Z-R relationship based on TRMM is Z=303R(0.72) with correlation coefficient 0.57. The newly developed algorithm is shown as correlation coefficient 0.67 and RMSE 17mm/hr. New algorithm shows the underestimating tendency in case of heavy rainfall event.
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김영섭(Kim Young-Seup),이정열(Lee Jeong-Yeol) 군산대학교 수산과학연구소 1988 水産科學硏究 Vol.- No.4
This study was conducted to understand the variation characteristics of suspended solid in the Keum River Estuary. Water sampling was carried out regularly with response to the tidal cycle from September, 1986 to August, 1987. Analyzed or observed items were sea water temperature, salinity, TS, TDS, TSS, VSS, FSS. And also the relationships between wind velocity, precipitation, tidal cycle and TSS were investigated. It is found that the sea water temperature is the lowest in January(2.5℃) and the highest in August(24.4℃), and increases toward upstream in summer and vice versa in winter. Salinity is the lowest in August(13.6‰) and the higheirt in December(20.3‰), and the annual mean value shows 13.6‰. TS and TDS are firmly related with her variation of salinity, thus, high in spring and low in summer. The annual mean values of TSS in 199.8(65.3-454.5)mg/ℓ, highest in March 308,2(61.5-792.3)mg/ℓ and lowest in June 36.8(10.9-200.0)mg/ℓ. The annual mean values of VSS is 22.0mg/ℓ, its variation tendency is similar to that of TSS. The annual mean value of VSS/TSS ratio is 13.9(6.8-20.0)%, which are not high level compared with those of polluted sea areas. This ratio is high in summer(24.1%) and low in autumn(13.3%), and increases toward the downstream direction. It is also revealed that TSS shows a positive corpoation with the wind velocity(r=O.59), and a negative with the precipitation in the. Keum River basin(r= -0.64). TSS concentration is primarily subjected to the tidal range and the freshwater discharge and also related to the resuspension of bottom sediments by the action of wind force or wind waves. The dilution rate is strongly subjected to the seasonal variation of the freshwater discharge, therefore, TSS concentration shows low in summer and high in winter. Under low discharge condition in spring, autumn and winter, TSS, VSS are high level in spring tide compared with those in neap tide: under high discharge condition in summer, these values are reversed that is, TSS is higher in neap tide than in spring tide.
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김영섭(Young Seup Kim),홍기만(Gi Man Hong) 한국지리정보학회 2002 한국지리정보학회지 Vol.5 No.2
Ocean surface wind speed was estimated using TRMM(Tropical Rainfall Measurement Mission) TMI(TRMM Microwave/Imager) data. It is used the TRMM TMI brightness temperature and National Data Buoy Center`s buoy winds speed dataset near North-America to estimate by the algorithm of the ocean surface wind speed retrieval over North America. Comparing with the buoy data by D-matrix equation, the result that RMSE, BIAS, and correlation coefficient are 2.19 ms^-1, 1.10 ms^-1, and 0.81, respectively. Therefore the estimated oceanic surface wind speed by TRMM TMI brightness temperature data show that available to ocean research over upper ocean.
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김영섭(Kim Young-seup),홍성근(Hong Sung-kun) 군산대학교 수산과학연구소 1985 水産科學硏究 Vol.- No.1
In order to provide the basic data required for setting up the proper strategies to minimize future marine environmental pollution on Kwangyang bay, the general water quality parameters, circulation pattern and dye study were investigated on January 19, 1984. Although TSS is somewhat high level, most suspended solid seem to composed of the inorganic materials. NH₃-N is also low level compared with that of other coastal areas so that the pollution by the nutrients is not serious yet. While COD is very high level in comparison with the results of other areas. The diffusive capability of this bay is assessed to be medium level.
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