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서애숙 ( Ae Sook Suh ),김금란 ( Kum Lan Kim ) 大韓遠隔探査學會 1990 大韓遠隔探査學會誌 Vol.6 No.1
This is the study about the meteorological satellite cloud image classification by objective methods. For objective cloud classification, linear discriminant analysis was tried. In the linear discriminant analysis 27 cloud characteristic parameters were retrieved from GMS infrared image data. And, linear cloud classification model was developed from major parameters and cloud type coefficients. The model was applied to GMS IR image for weather forecasting operation and cloud image was classified into 5 types such as Sc, Cu, CiT, CiM and Cb. The classification results were reasonably compared with real image.
서애숙 ( Ae Sook Suh ),김동호 ( Dong Ho Kim ),박경선 ( Kyung Sun Park ) 大韓遠隔探査學會 1995 大韓遠隔探査學會誌 Vol.11 No.2
현재 전세계적으로 널리 사용되고 있는 드보라크 방법에 의한 태풍강도 분석법을 1991년 우리나라에 영향을 준 6개 태풍사례에 대해 실제 적용하여 강도분석을 하였다. 또한 분석된 태풍 강도를 이용하여 태풍의 중심기압과 최대풍속을 산출하는 상관 관계식을 계산하여 제시하였다. ORCHID 태풍에 이 관계식을 실제 적용하여 관측값과 비교하여 그 정확도를 평가하였다. 그 결과 중심기압(MSLP: Minimum Sea Level Pressure)과 최대풍속(MWS: Maximum Wind Speed) 이 관측값보다 약간 낮은 값을 보였지만 전체적인 패턴은 비슷하게 나타났다. 그러나 미국 국립 해양 대기청(NOAA) 및 일본 기상청(JMA)에 의해 작성된 상관 관계표로 산출된 값은 관측값과는 많은 차이를 보여 주었다. One of the world widely used methods in determining the intensity of a typhoon is Dvorak`s technique. By applying the Dvorak`s method to the typhoons which affected our country in various degrees and extents without regard to their individual severity, we estimated their intensity for six different cases of typhoons. We have derived a regression equation of estimating the central pressures and maximum wind speeds for the six selected typhoons. Their intensity was estimated from the Dvorak`s method using GMS satellite image data. The derived equation has tested to typhoon ORCHID and the computed values have been compared with the direct observations in its central pressure and maximum wind speed. The computed values on the Dvorak`s method are smaller in their magnitudes than the observed corresponding values. But their relative magnitudes do not change so much at each different time step. But our results are significantly different from those of NOAA and JMA. The cause of differences are not investigated in depth in this analysis.
GMS 상층운량을 이용한 1993년과 1994년의 동아시아 몬순대류의 특성
서애숙 ( Ae Sook Suh ),하경자 ( Kyung Ja Ha ),문승의 ( Sung Euii Moon ),손승희 ( Seung Hee Sohn ) 大韓遠隔探査學會 1995 大韓遠隔探査學會誌 Vol.11 No.3
여름 몬순 강우가 대조적이었던 1993년과 1994년의 동아시아 여름 몬순의 특성이 조사되었다. 동아시아 지역에서의 몬순 특징을 조사하기 위해, GMS 구름양, 지표 조건인 해면 온도 그리고 여름 강우량이 분석되었으며, 위도/경도 2도 격자의 5일 평균 GMS 상층 운량의 분석을 통해 대류 활동의 자세한 이동과 지속성에 대한 1993년과 1994년의 특성이 비교되어 논의되었다. 몬순 구름의 이동과 발전에 대한 계절안 진동의 공간 및 시간 구조를 묘사하기 위해 20일의 창의 크기로 구성된 확장·경험적 직교 함수 분석이 각 해에 대해 수행되었다. 또한 적도 대류체의 주기성을 찾기 위해 퓨리에 조화 분석이 각 해에 적용되었다. 계절안 진동은 61일과 15일 모드가 적도 및 아열대에서 가장 탁월하였다. 그러나 이 탁윌 모드들은 적도 서 태평양과 인도양에서 각 해마다 다르게 나타났다. 그러므로 대조적인 동아시아 몬순 강우는 저 위도 해역에서의 대류 활동의 계절안 진동 및 계절 변화의 상호 작용과 더 근원적으로 관련되어 있을 것으로 본다. The characteristics of the Asian summer monsoon have been investigated for the periods of 1993/1994, the contrasting years in a view of the summer monsoon precipitation. In order to investigate the monsoon features over the eastern Asian monsoon region, the cloudiness(using the extensive data derived by the geostationary meteorological satellite), the condition of underlying surface including sea-surface temperature, and the summer rainfall are analyzed and some comparisons with 1993 and 1994 are also made and the characteristic differences are discussed. An analysis of the 2-degree latitude-longitude gridded 5-day mean high cloud amount data shows the detailed movement and persistence of the convective activities. In order to describe the spatial and temporal structures of the intraseasonal oscillation for the movement and evolution of the monsoon cloud, the extended empirical orthogonal function analysis with the twenty-day window size is used for the each year. Also, in order to find out the periodicity of the equatorial convective cluster, Fourier harmonic analysis is applied to the each year. The most prevailing intraseasonal oscillations of high cloud amount are 61 day mode and 15 day mode in the equatorial and the subtropical oceans. However it was found that the most prevailing modes over the equatorial western Pacific and Indian Ocean were different for each year, hence raising the possibility that the contrasting monsoon precipitation may be more fundamentally related to the interaction of intraseasonal oscillations and seasonal variation of convective activities over the lower latitude ocean.
서애숙(Ae Sook Suh),하경자(Kyung Ja Ha),정효상(Hyo Sang Chung) 한국지리정보학회 1998 한국지리정보학회지 Vol.1 No.1
In order to represent the surface characteristics in local meteorological model, soil type, vegetation index, surface roughness length, surface albedo and leaf area index should be prescribed on the surface process parameterization. In this study, the 1˚/
서애숙 ( Ae Sook Suh ),이미선 ( Mi Seon Lee ),김금란 ( Kum Lan Kim ),이희훈 ( Hee Hoon Lee ) 大韓遠隔探査學會 1994 大韓遠隔探査學會誌 Vol.10 No.1
The purpose of this study is to find the relationship between GMS image data and hourly observed rainfalls data. Heavy rainfall cases over South Korea on 10th September 1990 and on 29th July 1993 were selected for studying of the relationship between the image data and rainfalls. First, image data were converted to TBB(Temperature of Black Body) and albedo and then these values were extracted for the pixels closest to the surface observation stations to correlate with the rainfall data. Horizontal distribution of TBB and albedo tells roughly rainfall regions. The correlation between rainfall and TBB is found to be very low in quantitative analysis. The weak relationship between the brighter albedo and the higher rainfall probability is observed. This study suggests that the TBB values are useful in classifying rain areas and for heavy rainfalls the albedo values are more useful than the TBB. Low linear correlation between the fields may be attributed to the neglect of cloud types in this study.
특별기고 : 미국 NASA / JPL AIRSAR PACRIM 2 개요
서애숙(Ae Sook Suh),송병현(Byung Hyun Song),김금란(Kum Lan Kim) 한국지리정보학회 2000 한국지리정보학회지 Vol.3 No.2
Recently microwave remote sensing technology is widely used in Global environment study. Expecially Synthetic Aperture Radar sensing technique has many application to geographic information. Proposed AIRSAR Pacific Rim Deployment 2000(PACRIM2) is a NASA-sponsored science mission. AIRSAR is a test-bed instrument for new radar technologies in near future from space shuttle and satellite systems. In this paper the overview of PACRIM2 overview and sensors are introduced. Examples of processed data from new sensors are also shown.