서해 중부 해상 대기의 연직구조 분척

윤용훈,임주연,김백조,김태희,서장원,조하만,Youn, Yong-Hoon,Lim, Joo-Yun,Kim, Baek-Jo,Kim, Tae-Hee,Seo, Jang-Won,Cho, Ha-Man 한국지구과학회 2000 韓國地球科學會誌 Vol.21 No.1

To search out the characteristics of the lower and the upper atmospheric vertical structure, we selected the island(Oeyoundori Ochun-myen Poryeng city Chung-Nam) as an observation site, which is thought to represent the characteristics of ocean well, and observed the vertical structure of the atmosphere by Radiosonde. By using the results of the observation, we analyzed the changes of relative humidity(RH), temperature and wind when the cyclone and the anticyclone passed and compared the results in case of each event. To compare the vertical structure of the ocean atmosphere with those of the continent we analyzed the values observed with using Radiosonde at Osan site. Through this study, we found that relative humidity changed as the cyclone and the anticyclone passed. That is, when the cyclone came, RH increased first in the upper atmosphere than in the lower and when the high came, RH in the upper decreased sharply to 10%. And the variations of relative humidity in ocean are bigger than those in continent. In the future, we plan to f d out the relation between the vapor water in ocean and continent seasonally and daily through the observation in ocean and continent at same time. 상층과 하층의 대기구조 특성을 알아내기 위하여, 해양의 특성을 잘 표현한다고 사료되는 섬(충남 보령시 오천면 외연도리)을 관측지점으로 선택하여 라디오존데를 이용하여 대기의 연직구조를 관측하였다. 관측결과를 이용하여, 저 고기압이 통과할 때의 상대습도, 기온과 바람의 변화를 분석하였으며 각각의 경우에 대해 결과치들을 비교하였다. 해양과 육상에서의 대기구조를 비교하기 위하여 오산의 관측 결과를 분석하였다. 그 결과, 상대습도가 고 저기압의 통과에 따라 변화함을 알 수 있었다. 즉, 저기압이 다가올 때는 상대습도는 하층보다 상층에서 먼저 증가하였으나 고기압이 다가올 때는 상층에서 10%까지 급격하게 감소하였다. 또, 상대습도 변화폭이 육상에서보다 큰 것으로 분석되었다. 앞으로 해양과 육상에서의 수증기간의 관계를 계절별, 그리고 일별로 동시간 관측을 통해 찾고자 한다.

Validation of Salinity Data from ARGO Floats: Comparison between the Older ARGO Floats and that of Later Deployments

윤용훈,이호만,장유순,Pankajakshan Thadathil 한국지구과학회 2005 韓國地球科學會誌 Vol.26 No.2

Continued observation of ARGO floats for years (about 4 years) makes the conductivity sensor more vulnerableto fouling by marine life and associated drift in salinity measurements. In this paper, we address this isue by making useof floats deployed in diferent years. Floats deployed in the East Sea and the Indian Ocean are examined to find outspace-time diference). A time diference of less than five days and space diference of less than 10 km are consideredfor the match-up data sets. For analysis of the salinity drift under the stable water mass, observations of the floats fromdepest water masses have been used. From the cros-check of ARGO floats in the East Sea and the Indian Ocean, it isfound that there is a systematic drift in the older float compared to later deployments. All drift results, consistently shownegative bias indicating the typical nature of drift from fouled sensors. However, the drift is much less than 0.01, thespecified accuracy of ARGO program

이상 해수면 변동 예측을 위한 영상 표출 시스템 구축

윤용훈,서장원,한주영 한국기상학회 1999 한국기상학회 학술대회 논문집 Vol.1999 No.-

태풍의 이동경로에 따른 해일 발생 양상

윤용훈,김충기,김우규 한국해양환경·에너지학회 1998 한국해양환경·에너지학회 학술대회논문집 Vol.1998 No.-

칠발도 Buoy자료를 이용한 해양-대기 열교환량 산출 및 파랑 특성에 관한 연구

윤용훈,홍성길,홍윤,이지연,Youn, Yong-Hoon,Hong, Sung-Gil,Hong, Yoon,Lee, Ji-Yeon 한국해양학회 1998 바다 Vol.3 No.1

기상청에서는 1996년 7월부터 1997년 2월까지 목포앞바다의 칠발도 인접 해역에 1시간 간격으로 해양기상을 관측할 수 있는 부이를 설치하고 자료를 얻었다. 이 자료로부터 이 해역의 1일 평균 해양-대기 열교환량을 산출하고, 해양기상 상태의 특성을 조사하였다. 현열속의 경우, 7월에 최소(평균 -5.5 $Wm^{-2}$)이고, 1월에 최대(평균 12.6 $Wm^{-2}$)를 나타내고 있는데 이는 여름철에 대기가 해양으로 열을 공급하고 겨울철에는 반대로 해양에서 대기로 열을 공급하지만 그 크기는 여름철이 겨울철에 비해 작다는 것을 의미한다. 잠열속의 경우 7월에 최소(평균 -4.6 $Wm^{-2}$)를 보이고, 최대값은 11월에 월 평균 86.5 $Wm^{-2}$이고 10월에 일평균 최대값이 250$Wm^{-2}$까지 나타났다. 잠열 속은 대기가 건조해지고 바람이 강해지는 가을철에 최대가 나타나서 겨울철까지 지속된다. 파랑분석에 의하면 바람이 강한 겨울철이 여름철에 비해 높은 파의 출현율이 많았다 파주기는 4~6초의 출현율이 가장 많았고, 파향은 계절풍의 영향으로 겨울에는 북 또는 북동방향에서 유입되는 파가 우세하고, 여름에는 남, 남서 또는 서쪽에서 유입되는 파가 비교적 자주 출현하였다. Hourly meteorological data from a marine buoy ($34^{\circ}49'00"N$, $125^{\circ}46'00"E$) operated by the Korean Meteorological Agency were obtained from July, 1996 to February, 1997. From the data air-sea heat fluxes and marine meteorological characteristics around the area are estimated. The maximum outflux of sensible heat from the sea surface occurred in January (monthly mean value, 12.6 $Wm^{-2}$ and the maximum influx to the sea occurred in July (monthly mean value, 5.5 $Wm^{-2}$). This means that the sea is heated in summer while it loses its heat in winter, and that there is inequality between the absolute values of the two seasons. The outflux of the maximum latent heat occurred in November (monthly mean value, 86.5 $Wm^{-2}$) and reach a value of 300 $Wm^{-2}$, and the maximum influx occurred in July (monthly mean value, 4.6 $Wm^{-2}$). Big difference is shown in their absolute values when the wind becomes strong. The outgoing latent heat flux reaches its maximum in autumn, and it maintains the high value through the whole winter. According to the wave data analysis, the significant wave heights are larger in winter than in summer. The periods of the significant waves are 4~6 sec. In winter, waves propagated from north and northeast are dominant because of the winter monsoon, while in summer waves from south, southwest, and west are relatively frequent.

종격동 내 발생한 활막 육종 1예

윤용훈,강동욱,공은정,엄상용,이진서,류지원,김우성 영남대학교 의과대학 2013 Yeungnam University Journal of Medicine Vol.30 No.1

Synovial sarcoma is a rare malignancy in the thoracic cavity, especially in the mediastinum. In this paper, a case of primary mediastinal synovial sarcoma is reported. A 34-year-old woman was hospitalized with dyspnea. Her chest X-ray and computed tomography (CT) showed a 16×13×11 cm mass in her anterior mediastinal space. Surgical resection was performed but was incomplete. The pathological and immunohistochemical analysis confirmed the diagnosis of monophasic spindle cell synovial sarcoma. The patient underwent adjuvant radiotherapy for two months, but local recurrence and metastasis occurred in her pleural cavity. She eventually underwent chemotherapy for one year and died 18 months after her operation.

황해 저층냉수의 특성과 남하에 대한 재조명

윤용훈,박용향,봉종헌 한국지구과학회 1991 한국지구과학회지 Vol.12 No.1

Based on a precise analysis of the long-term(1971-1984) hydrographic and wintertime air temperature data gathered in the middle and southern yellow Sea, and together with other supplimentary data from Gteratures, water characteristics of the Yellow Sea Bottom Cold Water(YSBCW) and its southward extension are reexamined ; the influence of the wintertime air temperature on the YSBCW temperature and on its spatial distribution also discussed. It was found that the hitherto defined water characteristics (T, S) of the YSBCW restrict especially the upper limit of salinity to too lower values compared to the real situation, so they are not adequate to describe the spatial distribution of the water and its southward extension phenomenon. From the present study, the southward extention of the YSBCW through the cold water through west off Chejudo from spring to summer is found highly possible ; it is strongest is April and it can be detected until August. In consequence of such a southward advection of the bottom cold water, the water temperature at 50m depth in the cold water through west off Chejudo shows its lowest values in April, with a mean temperature increase by 0.4℃ only from April to August(compared to 4℃ increase near the axis of the Yellow Sea embayment). The frequently observed cold water mass from the west to the southwest(near 32°N, 126°E)off the island during spring and summer is connected with and influenced profoundly by the bottom cold water from the southern Yellow Sea, showing almost same water. characteristics as those of the latter ; it preserves quite well its wintertime water characteristics until summer. Therefore it seems to be quite reasonable to include this cold water mass(found west to southwest off Chejudo) in the definition of the YSBCW. Here, we have suggested a new definition of the YSBCW : T$lt;12℃, 32.2$lt;S$lt;33.5‰ With this new definition, the spatial distribution of the YSBCW from the offshore of the Shandong peninsula to the southwestern area off Chejudo as well as its southward extension from spring to summer can be adequately described. The wintertime air temperature is one of the most important meteorological factors, controlling the summertime water temperature of the YSBCW and its spatial distribution. In other words, the bottom cold water formed during a severe cold winter exhibits in summer lower temperatures and also wider spatial distribution toward the coasts and to the south than that formed during a mild winter.

한반도 동새상에서의 Topex/Poseidon 고도자료와 현장 조위계 관측 자료의 비교연구

윤용훈,김나영,김기현,황종선,김정우 한국지구과학회 2002 한국지구과학회지 Vol.23 No.4

97 백중사리시의 조석 및 해일 특성분석

윤용훈,김충기,김우규,김태희,서장원 한국기상학회 1998 한국기상학회 학술대회 논문집 Vol.1998 No.-

동아시아 주변해역에서의 TOPEX/POSEIDON 고도 자료와 현장 해수면 자료의 비교

윤용훈,김기현,박용향,오임상,Youn, Yong-Hoon,Kim, Ki-Hyun,Park, Young-Hyang,Oh, Im-Sang 한국해양학회 2000 바다 Vol.5 No.4

동아시아 해역에서 TOPEX/POSEIDON(T/P) 위성 고도계로부터 관측된 해수면 자료의 객관성을 검증하기 위하여 위성궤적에 시 ${\cdot}$ 공간적으로 가장 상응하는 10개소 조위관측소 자료(tide gauge data: TG)를 택하여 비교분석을 시행하였다. 이를 위해, 1992년 10월부터 1998년 12월까지 관측된 T/P의 고도자료(2${\sim}$230번 사이클)를 비교분석에 활용하였다. 연구대상지역인 동아시아 주변 해상의 강한 조석현상으로 인해, T/P자료를 이용한 역학 고도의 산출에서 조석오차의 처리가 대단히 중요하다. 이러한 문제점을 감안하여, T/P자료의 처리는 Park and Gamberoni(1995)가 제시한 방법을 이용하였다. T/P자료를 처리한 결과, M$_2$, S$_2$, K$_1$ 분조에 의한 주기가 각각 62.1, 58.7, 173일 주기의 조석변형 오차로 나타났다. 이러한 오차의 영향들을 감소시키기 위해, Gaussian 방식을 이용하여 다양한 주기별로 저주파 필터를 적용하였다. 필터주기별로 처리된 결과를 비교하면, 최소 200일 이상의 저주파 필터를 적용할 때 T/P자료의 거짓 신호를 이상적으로 제거할 수 있음이 확인되었다. 따라서 200일을 기준으로 모든 조위관측점들에 대해 RMS값을 구한 결과 2.8${\sim}$6.7 cm의 범위로 나타났고, 두 측정방식간에서 통계적으로 유의한(P <0.0001)상관성이 일관성있게 확인되었다. 이러한 연구결과에 따르면, 조석오차가 큰 동아시아 주변 해역에서 해수면 변화를 연구하기 위해서는 조석 오차의 영향을 최대한 억제할 수 있는 장주기 (최소한 200일)를 기준으로 해수면자료를 비교하는 것이 바람직하다. In an effort to assess the reliability of satellite altimeter system, we conducted a comparative analysis of sea level data that were collected using the TOPEX/POSEIDON (T/P) altimeter and the 10 tide gauge (TG) stations in the satellite passing track. The analysis was made using data sets collected from marginal sea regions surrounding the Korean Peninsula at T/P cycles of 2 to 230, which correspond to October 1992 to December 1998. Because of strong tidal activity in the study area, treatment of tidal errors is a very critical step in data processing. Hence in the computation of dynamic heights from the Tn data, we adapted the procedures of Park and Gamberoni (1995) to reduce errors associated with it. When these T/P data were treated, the alias periods of M$_2$, S$_2$, and K$_1$ constitutions were found at 62.1, 58.7, and 173 days. The compatibility of the T/P and TG data sets were examined at various filtering periods. The results indicate that the low-frequency signal of Tn data can be interpreted more safely with longer filtering periods (such as up to the maximum selected values of 200 days). When RMS errors for 200-day low-pass filter period was compared among the whole 10 tidal stations, the values spanned in the range of 2.8 to 6.7 cm. The results of correlation analysis at this filtering period also showed a strong agreement between the Tn and TG data sets over the whole stations investigated (e.g., P values consistently less than 0.0001). According to our analysis, we conclude that the analysis of surface sea level using satellite altimeter data can be made safely and reasonably long filtering periods such as 200 days.