• 대한원격탐사학회지
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• 제37권6_1호
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• pp.1507-1515
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• 2021

해색 원격 탐사를 통해 chlorophyll-a를 추정하면 식물성 플랑크톤, 해양일차생산력의 전 지구적 분포를 파악할 수 있다. 하지만 위성으로 관측된 해색 자료는 구름이나 기상 상황 등에 의하여 결측 데이터가 발생한다. 본 연구에서는 DINEOF를 이용하여 GOCI chlorophyll-a 산출물의 결측 자료를 복원하고자 하였다. DINEOF는 시·공간 자료에 기반을 두어 결측 자료를 복원하는 방법으로, 정확도는 GOCI chlorophyll-a 영상의 일부를 제거한 뒤 복원 영상과 비교하여 교차 검증하였다. 연구지역에서 DINEOF를 위한 최적의 EOF 모드는 10-13이었다. 시·공간 복원 자료 결과에서는 오후 시간대 chlorophyll-a 농도가 증가하는 경향이 반영되었고, 노이즈에 해당되는 이상치는 필터링 되는 효과를 보였다. 따라서 DINEOF는 결측이 발생한 영상에 대하여 복원 자료로 활용 가능할 것으로 보이며, 이를 통해 해양 환경 모니터링을 위한 기초 자료로 사용 가능할 것으로 판단된다.

• 한국수산과학회지
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• 제35권3호
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• pp.207-215
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• 2002

Ocean color properties can be quantified by the relationship between the band ratios of the sensor on the ocean color satellites and the measured field ocean color parameters, A tool to determine the abundance of primary organism using the observed ocean color properties from satellite is presented. Coincident to ocean color satellite passes over the Korean waters, the research vessels were deployed to survey the East Sea, the South Sea and the West Sea around the Korean waters, We have been able to have more than 101) data sets containing coincident in situ chlorophyll a and the estimated chlorophyll a derived from SeaWiFS (Sea-viewing Wide Field-of-view Sensor) from february, 1999 to October, 2001. We were able to develop three proper regional algorithms for the East Sea, the South Sea and the West Sea of the Korean peninsula to estimate chlorophyll a, and set up regional algorithms to quantify the suspended solid in the southern sea of the Korean peninsula, Futhermore we were successful in finding out a simple way of estimating chlorophyll a in the turbid water (Case 2 water) using the relationship between in situ chlorophyll a and the estimated chlorophyll a from the processed level 2 data, using the NASA's global algorithm.

• 한국지리정보학회지
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• 제9권3호
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• pp.36-45
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• 2006

1999~2001년 한국근해에서 수온, 클로로필 ${\alpha}$, 동물플랑크톤 등 현장자료와 해수색 위성원격탐사 자료를 분석하였다. 표면수온은 온대해역의 수온계절변동을 나타내었고, 클로로필 ${\alpha}$와 동물플랑크톤현존량은 온대해역의 특징을 보였으며, 춘계와 추계의 대량번식의 크기는 식물플랑크톤의 경우 춘계가, 동물플랑크톤은 추계가 더욱 크게 나타났다. 동서남해 해역에서 전반적으로 식물플랑크톤이 대량번식 후 15일에서 30일 정도의 시간차를 두고 동물플랑크톤의 현존량이 변동하였다. 동서 남해의 평균 클로로필 ${\alpha}$의 연별 변동은 춘계의 경우 해를 거듭 할수록 감소하는 경향을, 추계 연별 변동은 동해를 제외한 남해와 서해에서는 다소 증가하는 경향을 보였다. 한편, 위성자료에서 추정된 클로로필 ${\alpha}$의 농도는 현장에서 관측된 값보다 낮은 값으로 나타났다.

• 한국물환경학회지
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• 제30권3호
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• pp.329-339
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• 2014

This study aims to estimate chlorophyll-a concentration in rivers using multi-spectral RapidEye imagery and Spectral Mixture Analysis (SMA) and assess the applicability of SMA for multi-temporal imagery analysis. Comparison between images (acquired on Oct. and Nov., 2013) predicted and ground reference chlorophyll-a concentration showed significant performance statistically with determination coefficients of 0.49 and 0.51, respectively. Two band (Red-RE) model for the October and November 2013 RapidEye images showed low performance with coefficient of determinations ($R^2$) of 0.26 and 0.16, respectively. Also Three band (Red-RE-NIR) model showed different performance with $R^2$ of 0.016 and 0.304, respectively. SMA derived Chlorophyll-a concentrations showed relatively higher accuracy than band ratio models based values. SMA was the most appropriate method to calculate Chlorophyll-a concentration using images which were acquired on period of low Chlorophyll-a concentrations. The results of SMA for multi-temporal imagery showed low performance because of the spatio-temporal variation of each end members. This approach provides the potential of providing a cost effective method of monitoring river water quality and management using multi-spectral imagery. In addition, the calculated Chlorophyll-a concentrations using multi-spectral RapidEye imagery can be applied to water quality modeling, enhancing the predicting accuracy.

• 한국수산과학회지
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• 제37권3호
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• pp.215-225
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• 2004

Biomass and community composition of microphytobenthos in the Saemankeum tidal flat were studied by HPLC analysis of the photosynthetic pigments from November 2001 to November 2002. The environmental factors of sediment were also investigated to examine the relationship between microphytobenthos biomass and sedimentary environments. The detected photosynthetic pigments of microphytobenthos were chlorophyll a, b, c, fucoxanthin, 19'-hexanoyloxyfucoxanthin, violaxanthin, diadinoxanthin, alloxanthin, diatoxanthin, zeaxanthin+lutein, peridinin and beta-carotene. Pheophytin a, the degradation product of chlorophyll a, was also detected. The results of pigmen analysis suggest the presence of diatom (fucoxanthin), euglenophytes (chlorophyll b), chlorophytes (chlorophyll b + lutein), cyanobacteria (zeaxanthin), cryptophytes (alloxanthin), chrysophytes (fucoxanthin + violaxanthin), prymnesiophytes (19'-hexanoyloxyfucoxanthin) and dinoflagellates (peridinin). Chlorophyll a concentration in the top 0.5 cm of sediment was in the range of $0.24\;mg{\cdot}m\^{-2}\;-32.11\;mg{\cdot}m\^{-2}$ in the study area. The increase of chlorophyll a concentration in the spring indicates the occurrence of a microphytobenthic bloom. In the summer, there was a sharp decrease of the chlorophyll a concentration which was probably due to high grazing activity by macrobenthos. The annual mean chlorophyll a concentration in the study area was low compared to that in most of other tidal flat areas probably due to active resuspension of microphytobenthos and high grazing activity by macrobenthos. There was no clear relationship between microphytobenthos biomass and sedimentary environments because of a large variety of physical, chemical and biological factors, Pigment analysis indicated that while diatoms were dominated in the microphytobenthic community of the Geojon tidal flat, euglenophytes and/or chlorophytes coexisted with diatoms in the Mangyung River tidal flat.

• 환경생물
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• 제18권3호
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• pp.355-365
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• 2000

본 연구는 1998년 5월부터 11월까지 대청호의 2개 정점 표ㆍ중ㆍ저층에서 수질과 일차생산을 나타내는 식물플랑크톤 현존량과의 관계를 규명하기 위하여 물리ㆍ화학적 환경요인(수온, 용존산소량, pH, 투명도, 총질소, 질산염, 아질산염, 암모니아, 총인, 인산염, 용존총인, 총유기탄소, 부유물질), 식물플랑크톤 현존량, chlorophyll-a의 농도를 조사하였다. 영양염류(아질산염, 질산염, 암모니아 및 인산염)가 과거에 비하여 증가되었으며, 총질소, 총인,chlorophyll-a 및 투명도는 부영양화의 기준치를 초과하여 대청호의 수질은 심한 부영양화 수역으로 판명되었다. 식물플랑크톤 현존량은 7월과 8월의 정점 1을 제외하고 년중 대발생을 유지하고 있었으며, 봄철 대발생은 아질산염, 질산염 및 인산염의 영향이 큰 것으로 판명되었다. Chlorophyll-a의 농도는 식물플랑크톤 현존량의 월별 변동과 대부분 같은 경향으로 변화하였다. 여름철에 높은 부유물질은 장마기의 강우에 따른 것으로 판단되며, 특히 8월의 많은 종속영양 세균수는 높은 수온과 장마시 주변 수역으로부터 유입된 각종 유기영양염류의 유입에 따른 대량증식으로 추정된다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.162-165
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• 2007

Chlorophyll concentration is an important factor for physical oceanography as well as biological oceanography. For these necessity many oceanographic researchers have been investigated it for a long time. But investigation using vessel is very inefficient, on the other hands, ocean color remote sensing is a powerful means to get fine-scale (spatial and temporal scale) measurements of chlorophyll concentration. Geostationary Ocean Color Imager (GOCI), for ocean color sensor, loaded on COMS (Communication, Ocean and Meteorological Satellite), will be launched on late 2008 in Korea. According to the necessity of algorithm for GOCI, we developed chlorophyll algorithm for GOCI in this study. There are two types of chlorophyll algorithms. One is an empirical algorithm using band ratio, and the other one is a fluorescence-based algorithms. To develop GOCI chlorophyll algorithm empirically we used bands centered at 412 nm, 443 nm and 555 nm for the DOM absorption, chlorophyll maximum absorption and for absorption of suspended solid material respectively. For the fluorescence-based algorithm we analyzed in-situ remote sensing reflectance $(R_{rs})$ data using baseline method. Fluorescence Line Height $({\Delta}Flu)$ calculated from $R_{rs}$ at bands centered on 681 nm and 688 nm, and ${\Delta}Flu_{(area)}$ are used for development of algorithm. As a result ${\Delta}Flu_{(area)}$ method leads the best fitting for squared correlation coefficient $(R^2)$.

• 한국농림기상학회지
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• 제1권2호
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• pp.103-109
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• 1999

This study was carried out to investigate spectral characterisistics and chlorophyll contents of Pinus koraiensis needles in Gwangju-gun, Kyunggi-do. In spectrum analysis by each age, needle showed difference on 700∼1,100 nm(NIR : near infrared ray). Light reflexibility keeps constant between 1st year needle and 3rd year needle, current year needle's value was higher than others and that was higher for 400∼500 nm and 600∼700 nm at 550 nm. Transmission to needle's age showed the highest result in current year needle. It showed in order of current, 1st, 2nd and 3rd year needle at 550 nm and 750 nm. Especially, current year needles of Pinus koraiensis showed a tendency to change transmission coefficient in NIR. The result of transmission coefficient measurement by each position of slope showed in order of middle slope, upper slope and lower slope. But the gathered needle in middle slope made marked change at NIR. Chlorophyll a content of the upper slope's needles was higher than other 4 positions but a component ratio was lower. In needle of the oppressed tree, Chlorophyll a content was rather low than others. Chlorophyll a content by slope positions, the upper slope's needle showed a highest value(4.48 mg/g) and lower slope was lowest value(1.35 mg/g). Chlorophyll b content also showed a similar tendency to chlorophyll a and chlorophyll(a+b) contents.

• 상하수도학회지
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• 제29권3호
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• pp.325-335
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• 2015

Concerns about water quality in the Nakdong River have been raised because the Nakdong River will change from a lotic environment to a lentic environmental due to the installation of eight weirs to be constructed as part of the Four Major Rivers Restoration Project. The rapid urbanization and industrialization of the middle and the lower reaches of Nakdong River causes the indiscreet discharge of uncleanly living sewage and industrial wastewater. And the water quality of lower reaches of Nakdong River is getting seriously worse. Owing to the water shortage of Nakdong River and the closing of reaches because of the estuary dyke in the dry season, the velocity of a moving fluid is almost accumulated under 0.03m/sec. Then a pollutant is piled up on the bottom of the river. Polluted sediment is formed and nutrition level of water is increased more and more. The eutrophication state propagated to dark brown or green from eutrophication often comes out. Therefore in this study, we measured Chl. a of chlorophyll sensor (YSI6600V2) and aceton extraction through field observation in the Nakdong River and Samrangjin. And we evaluated the reliability of chlorophyll sensor. In correlation analysis between chlorophyll sensor and aceton extraction, it shows high relation in general. And it also shows high relation among the chlorophyll sensor and aceton extraction of the dominant diatom (Skeletonema costatum), Dinophyta (Prorocentrum minimum) in the Nakdong River estuary by laboratory analysis results.

• Journal of Plant Biology
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• 제5권3호
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• pp.11-20
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• 1962

본실험에서는 Gibberellin 이 여섯작물의 생육 및 그들의 성장에 미치는 토양재배를 과하여 조사하였다. 식물 잎에 살포한 Gibberellins의 비교적 적은 농도차는 식물의 생육 및 내부 성분에 현저한 차이를 가져오는 것을 알 수 있다. 농도가 높아짐에 따라 작물의 생육은 촉진되고 그 생육간의 차이는 유의하였다. 여섯 작물의 Chlorophyll 및 Corotene 함량은 Gibberellin의 농도에 비례하여 감소 되었으며 이는 생장율과 크게 상반되었다. 여섯 작물의 Vitamin C의 함량은 Gibberellin의 농도에 비례하여 감소되었다. 이 차는 무, 쑥갓 및 시금치에서 높은 유의성을 나타냈다. Chlorophyll과 Vitamin C의 함량은 발육이 진전 됨에 따라 달라지는데 이 차이는 유의한 것이다. Corotene 함량은 Chlorophyll 량과 함께 변하였는데 Carotene과 Chlorophyll의 비는 Beck 및 Redman이 얻은 결과처럼 높은 것은 아니다.