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The CO_2_ Flux Estimation in the North Pacific Ocean Based on Satellite and Ship Data
Sugimori, Y.,Zhao, C.,Akiyama, M.,Itoh, N. 대한원격탐사학회 1995 International Symposium on Remote Sensing Vol.11 No.1
Two kinds of effort have been proceed in estimating air-sea carbon dioxide (CO₂) flux, one is the relationship between wind stress, roughness and wave parameters using waverider and meteorological buoy, and a new relationship between u* and u_(10) is derived after considering wave developing state i.e. u* = 0.0360u_(10)^(1.l832) or in linear relationship u*=0.0010u_(10)²+0.0454u_(10)-0.013 based on JMA meteorological buoy data analysis. This relationship is used in estimating gas exchange velocity based on whitecap model (Monahan and Spillane 1984). The other one is to estimate the difference of carbon dioxide (CO₂) beteen atmosphere and ocean from SST using Ryofu Maru ship data. Finally the distribution and variation of CO₂ exchange coefficient in the North Pacific Ocean are estimated from satellite data (DMSP SSM/I and NOAA data).
Ha, Kyung Ja,Suh, Ae Sook,Yasuhiro, Sugimori,Moon, Ja Yeon 한국환경과학회 1996 한국환경과학회지 Vol.5 No.5
Intraseasonal variability of the tropical convection over the Indian/western Pacific is studied using the Geostationary Meteorological Satellite high cloud amount. This study is directed to find the tropical-extratropical interaction in the frequency range of intraseasonal and interannual variabilities of the summer monsoon occured over the domain of 90E-171W and 49S-50N. Especially, in order to investigate the intraseasonal interaction of East Asia summer monsoon associated with the tropical convections in the high cloud amounts, the spatial and time structure of the intraseasonal oscillation for the movement and the evolution of the large-scale convections are studied. To describe the spatial and the time evolution, the extended empirical orthogonal function analysis is applied. The first mode may be considered to a normal structure, indicating that the strong convection band over 90E-120E is extended to eastward, but this mode was detected as a variable mode near Korea and Japan. The second, third and fourth modes were amplified with the intraseasonal variability during summer monsoon. It is found that the dominant intraseasonal mode of the tropical convection consists of the spatial changes over a broad period range centered around 40∼50days.
이성애,杉森康宏,김영섭 한국지리정보학회 2004 한국지리정보학회지 Vol.7 No.1
일본 동경만의 흐름양상과 생물플럭스의 분포특성을 역학-생태계모델을 통해 구현하고, 위성자료에서 얻어진 영상과 비교 분석하였다. 모델의 초기치와 경계치는 2001년 3월의 관측값들을 이용하였다. 운용된 모델 결과에서 얻어진 동경만의 흐름양상과 염분분포 등은 선행연구들과 대체로 일치하며 모델의 재현성을 어느 정도 신뢰할 수 있었다. NOAA/AVHRR에서 추정된 SST는 모델 결과에 비해 전체적인 분포양상은 아주 유사하였으나, 만입구에서 2.5℃정도, 내만에서 0.5℃ 정도 높게 추정되었다. 위성에서 얻어진 클로필-a 분포는 모델결과의 식물플랑크톤분포와 그 양상이 비슷하나, 농도는 상당한 차이가 나는 것을 확인할 수 있었다. 이러한 불일치에 관해서는 앞으로도 계속적인 연구가 수행될 예정이다. The hydro-dynamical and ecological coupled model were applied in the Tokyo Bay, to evaluate the flow pattern including water quality parameters and the distribution of biomass flux, and to compare with the results obtained from the satellite data during March 2001. The flow pattern and salinity distribution obtained from the present model were nearly identical with those of the previous studies. SST from NOAA/AVHRR was 2.5℃ higher than model reuslts in the mouth of bay and 0.5℃ lower than model results in inner bay, respectively. It was found that the concentration of chlorophyll-a estimated from SeaWiFS was considerably higher than that of model result, regardless similar distribution pattern. This disagreement will be studied through the more elaborate investigation in the future.
Study on Characteristic of Asian Summer Monsoon by Satellite data and Re-analysis data
Lee, Sung Ae,Sugimori, Yasuhiro,Suwa, Jun,Kim, Young Seop 대한원격탐사학회 1999 International Symposium on Remote Sensing Vol.15 No.1
The characteristic of East Asian summer monsoon is investigated using 8-year (March 1987-February 1995) .. averaged monthly and 5-day mean 1 degree latitude-longitude gridded GMS high-cloud-amount data (HCA). An analysis of these data shows the connective zone (ITCZ) clouds which defined as the percentage of the total grid area covered by clouds with a cloud-top temperature below the 400 hPa-level climatological temperature. The HCA increased clearly over equatorial zone during December and January and 30 - 40。N during May and June. These HCA patterns are coincided with seasonal cycles of summer monsoon which is introduced in historical references. The relationship with the summer monsoon winds as climatological changing of wind direction is analyzed by ECMWF re-analysis 2.5-degree latitude-longitude grid surface data which is calculated with 8-year averaged from January 1987 to January 1995. In addition, the monsoon winds are showed by separated U, V-wind components for manifestation a tendency of onset and retreat data of seasonal monsoon.
Jo, Myung Hee,Sugimori, Yasuhiro,Jo, Hwa Ryong 대한원격탐사학회 1997 International Symposium on Remote Sensing Vol.13 No.1
Using Landsat TM image of the Kimhae Delta plain, Korea, this study clarifies the reason why paddy fields make different tones after harvest. In order to examine the brightness difference, the study collected soil samples from two areas and analyzed a soil grain size and chemical contents. According to the analyses, the brightness difference could not be explain by the soil moisture, grain size composition and the quantity of organic matters. However, two sample areas showed a clear difference in their saline contents, and the distribution pattern of saline soil and non-saline soil corresponded with the landform development of delta. Therefore, the study concludes that the saline difference is the cause of the bright difference.
Osawa, Takahiro,Akiyama, Masatoshi,Sugimori, Yasuhiro 대한원격탐사학회 1999 International Symposium on Remote Sensing Vol.15 No.1
As one of the key parameters to determine CO₂ flux between air - sea interface, it is quite important to know pCO₂, which has involved much uncertainty, mainly due to the complex variations of sea surface pCO₂and the paucity of samples, made in ocean. In order to improve the interrelationship between partial pressure (pCO₂) and different physical and biochemical parameters in global sea surface water, a new empirical relation is established to correlate and parameterize pCO₂ in the mixed layer using the data from recent WOCE cruises. Meanwhile, by new empirical relation, abundant historical hydrographic and nutrients ship data, Levitus data set and NOAA/AVHRR(SST), pCO₂have been accumulated and applied. Then effort has to be made for promotion of this study to correlate and parameterize pCO₂in the mixed Layer with different physical and biochemical parameters, and further attribute this huge historical data sets and NOAA/AVHRR(SST) data to estimate pCO₂. In this paper we analyzed more interrelationship between the model and ship/satellite data set. Finally, the inter-annual variations of pCO₂ in sea are presented and discussed.