• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.292-297
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• 1998

• Journal of Biosystems Engineering
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• 제25권6호
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• pp.497-502
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• 2000

For the analysis of geothermal energy utilization in agriculture the relations between soil temperature and geographical variables such as latitude longitude and sea level in Korea were analyzed and the regression equations were suggested among them. The measured soil temperature data for four years in eighteen cities were used to get the soil temperature fitting equation depending on the soil depth and the time of year in each city. The mean correlation coefficient for those data fitting was 0.980. the correlation coefficient of regression analysis for the mean soil temperature($T_{m}$) on the geographical variables such as latitude longitude and height above sea level was 0.958 and those for soil surface temperature amplitude(Tss) and phase constant(tp) were 0.889, 0.835, respectively. The relation between the apparent thermal diffusivity of the soil and the three geographical variables was not significant. The regression equations for the mean soil temperature($T_{m}$) soil surface temperature amplitude(Tss) and phase constant(tp) adopting latitude($X_{1}$) longitude($X_2$) height above sea level($X_3$) were as follows : $T_{m}$=50.049 - $0.849X_1$-$0.03131X_2$-$0.00622X_3$Tss=-6.970 +$0.584X_1$+$0.00530X_2$-$0.00214X_3$tp=70.353 - $1.404X_1$+ $0.02098X_2$+ $0.00312X_3$

• Ocean Science Journal
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• 제40권2호
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• pp.67-78
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• 2005

Complex physical, chemical and biological interactions off the Korean coast created several striking patterns in the phytoplankton blooms, which became conspicuous during the measurements of ocean color from space. This study concentrated on analyzing the spatial and temporal aspects of phytoplankton chlorophyll variability in these areas using an integrated dataset from a Sea-viewing Wide Field-of-view Sensor (SeaWiFS), Advanced Very High Resolution (AVHRR) sensor, and Conductivity Temperature Depth (CTD) sensor. The results showed that chlorophyll concentrations were elevated in coastal and open ocean regions, with strong summer and fall blooms, which appeared to spread out in most of the enclosed bays and neighboring waters due to certain oceanographic processes. The chlorophyll concentration was observed to range between 3 and $54\;mg\;m^{-3}$ inside Jin-hae Bay and adjacent coastal bays and 0.5 and $8\;mg\;m^{-3}$ in the southeast sea offshore waters, this gradual decrease towards oceanic waters suggested physical transports of phytoplankton blooms from the shallow shelves to slope waters through the influence of the Tsushima Warm Current (TWC) along the Tsushima Strait. Horizontal distribution of potential temperature $(\theta)$ and salinity (S) of water off the southeastern coast exhibited cold and low saline surface water $(\theta and warm and high saline subsurface water $({\theta}>12^{\circ}C; S>34.4)$ at 75dBar, corroborating TWC intrusion along the Tsushima Strait. An eastward branch of this current was called the East Korean Warm Current (EKWC), tracked with the help of CTD data and satellite-derived sea surface temperature, which often influenced the dynamics of mesoscale anticyclonic eddy fields off the Korean east coast during the summer season. The process of such mesoscale anticyclonic eddy features might have produced interior upwelling that could have shoaled and steepened the nutricline, enhancing phytoplankton population by advection or diffusion of nutrients in the vicinity of Ulleungdo in the East Sea.

• Ocean and Polar Research
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• 제34권2호
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• pp.201-218
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• 2012

The purpose of this study is to investigate climatological variations from the sea surface temperature (SST), chlorophyll-a concentration (Chl-a), and phytoplankton size class (PSC), using NOAA AVHRR, SeaWiFS, and MODIS data in the South Sea of Korea (SSK) and East China Sea (ECS). 26-year monthly SST and 13-year monthly Chl-a and PSC data, separated by whole and nine-different areas, were used to understand seasonal and inter-annual variations. SST and Chl-a clearly showed seasonal variations: higher SST and Chl-a were observed during the summer and spring, and lower values occurred during the winter and summer. The annual and monthly SST over 26 years increased by $0.2{\sim}1.0^{\circ}C$. The annual and monthly Chl-a concentration over 13 years decreased by $0.2{\sim}1.1mg/m^3$. To determine more detailed spatial and temporal variations, we used the combined data with monthly SST, Chl-a, and PSC. Between 1998 and 2010, the inter-annual trend of Chl-a decreased, with decreasing micro- and nano-size plankton, and increasing pico-size plankton. In regional analysis, the west region of the study area was spatially and temporally correlated with the area dominated by decreasing micro-size plankton; while the east region was less sensitive to coastal and land effects, and was dominated by increasing pico-size plankton. This phenomenon is better related to one or more forcing factors: the increased stratification of ocean driven by changes occurring in spatial variations of the SST caused limited contributions of nutrients and changed marine ecosystems in the study area.

• Ocean and Polar Research
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• 제33권3호
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• pp.281-290
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• 2011

This study examined the change in sea surface temperature (SST) around the Korean peninsula since industrialization at year 1880, and its possible causes using observation based data from the Hadley Center, the Goddard Institute of Space Studies, and National Climate Data Center. Since year 1880, There have been multi-decadal fluctuations with a gradual reduction from 1880 to around 1940, and from 1950-1980. There has then been a marked increase from 1940-1950, and from 1980 to the present. The ocean surface warming is larger during the boreal winter than summer, and greater in the south. The multi-decadal SST fluctuations around the Korean Peninsula are largely consistent with the negative phase of the Pacific Decadal Oscillation (PDO), which fluctuates with periods of about 20-50 years. Secondly, the El Ni$\tilde{n}$o-Southern Oscillation (ENSO), whose long period component moves along with the PDO, appears to influence the SST near the Korean Peninsula, especially in recent decades. Overall, the SST around the Korean Peninsula has warmed since year 1880 by about $1^{\circ}C$, which is about twice the global-mean ocean surface warming. This long-term warming is aligned with an increase in greenhouse gas concentration, as well as local factors such as the PDO.

• 대한원격탐사학회지
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• 제39권6_1호
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• pp.1477-1482
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• 2023

본 연구는 2012년부터 2021년까지 동북아시아 해역에서 발생한 해수고온현상을 Communication, Ocean, and Meteorological Satellite (COMS)/Meteorological Imager sensor (MI)와 GEO-KOMPSAT-2A (GK-2A)/Advanced Meteorological Imager sensor (AMI) 정지궤도 위성 해수면온도 자료를 통해 탐지하였다. 특히 2018년 이후 및 2020년에 해수고온현상의 빈도와 강도가 눈에 띄게 증가하였음을 발견하였다. Optimal Interpolation Sea Surface Temperature (OISST) 자료와 천리안위성 자료를 활용한 T-test 통계적 검증은 해수면 온도가 통계학적으로 유의미하게 상승했다는 것을 확인시켜 주었으며, 이는 기후 변화의 직접적 영향이라는 결론을 뒷받침한다. 이 연구 결과는 해수고온현상의 지속적인 모니터링과 정밀한 분석의 중요성을 강조한다. 복잡한 지형과 다양한 기후 조건을 가진 동북아시아에서 이루어진 연구는 글로벌 기후 변화가 지역 환경에 미치는 영향을 이해하는 데 있어 중요한 통찰을 제공한다.

• 대한원격탐사학회지
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• 제32권6호
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• pp.589-601
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• 2016

Himawari-8/Advanced Himawari Imager (AHI) 열적외 채널 자료에 Maximum Cross Correlation (MCC), Zero-mean Sum of Absolute Distances (ZSAD), Zero-mean Sum of Squared Distances (ZSSD) 알고리즘을 적용하여 표층 해류를 산출하고, 그 결과를 비교 분석하였다. 각 알고리즘으로 쿠로시오해류 해역의 표층 해류장을 산출한 결과 서로 유사한 양상을 보였다. 오차 발생 비율은 알고리즘에 따른 차이가 거의 나타나지 않았으며, 표층 해류 산출 연산에 소요되는 시간은 ZSAD와 ZSSD 알고리즘이 MCC 알고리즘에 비해 각각 24%, 18% 감소하였다. 산출된 표층 해류는 인공위성 추적 표층 뜰개 자료와 인공위성 고도계 자료로 계산한 표층 해류를 통해 검증하였고, 세 가지 알고리즘의 정확도는 모두 유사한 범위의 값으로 나타났다. 또한 산출된 표층 해류의 정확도는 휘도 온도 수평 구배의 크기와 두 영상 사이의 시간 간격에 의해 영향을 받았다.

• 해양환경안전학회지
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• 제25권6호
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• pp.678-686
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• 2019

본 연구에서는 인공위성 해수면온도 편차(Sea Surface Temperature Anomaly, SSTA)를 이용하여 한반도 연안해역의 고수온 해역을 추출하고, 국립수산과학원의 고수온속보 발령 문서와 비교하였다. 일일 SSTA 이미지를 이용하여 임계값을 적용하는 고수온 탐지 알고리즘을 제안하였으며, 고수온 주의보는 2℃ 이상, 경보는 3℃ 이상인 것으로 가정하였다. 2017~2018년 7~9월의 일평균 SST를 기반으로 한 편차자료를 사용하였으며, 고수온속보에 사용되는 지역을 대상으로 위성기반 탐지 결과를 9개 영역으로 구분하고 비교하였다. 해역별 고수온 발생 횟수 비교 결과, 수온 관측 부이가 고르게 분포한 남해 연안은 고수온속보와 위성 탐지 횟수가 유사하게 나타났다. 반면에 다른 해역은 위성 탐지 횟수가 약 2배 이상 많았으며, 이는 고수온속보 발령이 해역의 일부 위치 수온만을 고려하기 때문인 것으로 판단된다. 본 연구 결과는 향후 위성기반 연안해역 고·저수온 모니터링 체계 개발에 활용하고자 한다.

• 한국패류학회지
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• 제28권3호
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• pp.277-291
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• 2012

Aquaculture is challenged by a number of constraints with future efforts towards sustainable production. Global climate change has a potential damage to the sustainability by changing environmental surroundings unfavorably. The damaging parameters identified are water temperature, sea level, surface physical energy, precipitation, solar radiation, ocean acidification, and so on. Of them, temperature, mostly temperature elevation, occupies significant concern among marine ecologists and aquaculturists. Ocean acidification particularly draws shellfish aquaculturists' attention as it alters the marine chemistry, shifting the equilibrium towards more dissolved CO2 and hydrogen ions ($H^+$) and thus influencing signaling pathways on shell formation, immune system, and other biological processes. Temperature elevation by climate change is of double-sidedness: it can be an opportunistic parameter besides being a generally known damaging parameter in aquaculture. It can provide better environments for faster and longer growth for aquaculture species. It is also somehow advantageous for alleviation of aquaculture expansion pressure in a given location by opening a gate for new species and aquaculture zone expansion northward in the northern hemisphere, otherwise unavailable due to temperature limit. But in the science of climate change, the ways of influence on aquaculture are complex and ambiguous, and hence are still hard to identify and quantify. At the same time considerable parts of our knowledge on climate change effects on aquaculture are from the estimates from data of fisheries and agriculture. The consequences may be different from what they really are, particularly in the temperature region. In reality, bivalves and tunicates hung or caged in the longline system are often exposed to temperatures higher than those they encounter in nature, locally driving the farmed shellfish into an upper tolerable temperature extreme. We review recent climate change and following environment changes which can be factors or potential factors affecting shellfish aquaculture production in the temperate region.

• 한국어병학회지
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• 제21권1호
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• pp.35-43
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• 2008

남해안 일원의 양식 대상종인 참돔의 월동기간중의 폐사발생 원인구명을 위해 병리학적, 혈액생화학적 성상 및 장단기간 양식장의 수온조사를 종합비교하였다. 1. 월동 기간중에 폐사한 참돔의 병리학적조사결과, 육안적으로 녹간증, 장내 복수 증상을 나타내었으며, 경증의 아가미흡충 감염을 제외한 세균, 바이러스 질병은 확인하지 못하였다.2. 혈액생화학적 분석결과, 폐사시기에 혈중의 AST, ALT는 폐사시기에 급격히 높아졌으며, 단백질, 지방 성분값은 저하된 것으로 나타났다. 3. 실시간 양식어장 환경정보제공시스템의 수온 분석에 의하면, 참돔의 폐사가 가장 먼저 시작된 해역인 사량도 해역은 참돔의 저온 한계수온인 8℃ 이하의 수온이 42일간 지속된 것으로 나타나 저수온에 장기간 노출된 것으로 판단되었다. 4. 폐사가 많았던 사량도 양지와 미륵도 명지해역의 2003년에서 2006년까지 3년간 장기수온변화를 보면, 월동기간인 2005년 12월에서 2006년 2월까지의 수온이 2003, 2004년에 비해 낮은 수온 분포를 보였다.5. 참돔의 폐사발생해역은 비폐사해역에 비해 수심이 얕으며, 수층별 수온변화가 큰 것이 특징이었다.