• 제목/요약/키워드: Asian waters

검색결과 58건 처리시간 0.024초

A Strategic Approach for Regional Fisheries Organization Establishment in Northeast Asia

  • Shin, Yong-Min
    • 수산경영론집
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    • 제44권3호
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    • pp.1-14
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    • 2013
  • This study considers an approach for subregional fisheries organization in Northeast Asia. The fishery resources in the Northeast Asian waters surrounding Korea are among the most productive in the world because of their extremely high biological productivity and the natural features of the sea. However, the fishery resources of the region have long been subject to heavy fishing pressures, and many stocks are now believed to be seriously depleted or even in danger of extinction because of overfishing. To move to a run sustainable fishery in Northeast Asia waters area, cooperative fisheries management between Korea, China and Japan for common resource is probably necessary. Cooperative fisheries management is likely to be more effective in fishery resources management than individual fisheries management by countries. The effects of fisheries management by regional cooperation can be divided into resource management and economical performance. Cooperative fisheries management as RFO will bring satisfactory results. Currently these jurisdictional extensions and resulting disputes over maritime space and resources were thrust upon an already transitional and unstable political environment. However, They have to have a strategic approach for RFO establishment step by step. Cooperative fisheries management using the RFO can mitigate these disputes, and cooperative bilateral fisheries arrangements have been proliferating over the past 10 years and may provide the basis for possible trust-building multilateral agreements.

Molecular Classification of the Genus Grateloupia (Halymeniaceae, Rhodophyta) in Korea

  • Lee, Ju-Il;Kim, Hyung-Geun;Geraldino, Paul John L.;Hwang, Il-Ki;Boo, Sung-Min
    • ALGAE
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    • 제24권4호
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    • pp.231-238
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    • 2009
  • The genus Grateloupia is the largest with more than 96 currently recognized species in the family Halymeniaceae, but morphological features of the genus are highly homoplasious making species identification difficult. In this study, we analyzed rbcL gene from 34 samples collected in Korea and compared the haplotypes of Korean species with those already published. The rbcL tree confirmed the occurrence of eight species in Korea: G. asiatica, G. catenata, G. divaricata, G. elliptica, G. imbricata, G. lanceolata, G. subpectina, and G. turuturu. All, except G. asiatica and G.catenata, been introduced from their native northeastern Asian waters to Australasian, European, and North American waters. The introduced haplotypes of G. lanceolata in Europe and North America were absent in Korea, while haplotype sharing of G. turuturu in Korea and Europe was common. Further sampling will show a source population of each introduced species and also provide a correct list of Grateloupia from Korea, including the other remaining 11 species of the genus.

NOAA AVHRR 자료를 이용한 해수면온도 산출에 황사가 미치는 영향 (Examining Influences of Asian dust on SST Retrievals over the East Asian Sea Waters Using NOAA AVHRR Data)

  • 전형욱;손병주
    • 대한원격탐사학회지
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    • 제25권1호
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    • pp.45-59
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    • 2009
  • 본 연구에서는 NOAA AVHRR 밝기온도 자료로부터 해수면 온도(SST) 산출에 황사 에어로솔은 미치는 영향을 복사전달 모델을 사용하여 분석하고, SST 복원 알고리즘을 개선하였다. 봄철의 황사에 의한 AVHRR 밝기온도 변화를 모의하기 위한 복사전달 모델의 입력 자료로서 지상 태양광 관측 자료로부터 분석한 황사 에어로솔 광학적 특성 (에어로솔 광학적 두께 및 크기분포)과 라디오 존데 연직분포 자료(기압, 기온, 및 습도)를 이용하였다. 황사 에어로솔은 적외선 복사대에서 흡수에 비해 산란이 매우 큼을 보였으며, 이러한 특징은 지표면에서 방출되는 상향복사량을 산란시켜 대기상부에서 관측되는 밝기 온도를 감소시키는 경향과 관련이 있다. 광학적 두께가 1인 황사의 경우 직하점에서 약 2 K, 위성 천정각이 $50^{\circ}$인 경우에는 약 4 K의 감쇄를 유발하였다. 황사 존재시 AVHRR 적의채널 11, $12{\mu}m$의 밝기온도 차 역시 감소하는 경향을 보이고 있지만 그 값은 미미하였다. 기존 SST 복원 알고리즘은 황사발생시 SST를 실제 값보다도 낮게 산출함을 보였으며, 이를 보정하기 위해 에어로솔 광학적 두께, $11{\mu}m$에서의 밝기온도, 그리고 위성 천정각을 추가하여 알고리즘을 개선하였다. 개선된 SST 복원 알고리즘은 황사의 두께가 1인 경우 2.7 K정도의 오차를 개선하였다.

A NEW TREATMENT SYSTEM FOR ANIMAL WASTE WATER USING MICROORGANISM, SOIL AND VEGETATION

  • Oshida, T.;Fukuyasu, T.;Kohzaki, K.;Izumikawa, Y.;Kawanabe, S.;Konishi, S.;Oikawa, N.;Matsumoto, S.
    • Asian-Australasian Journal of Animal Sciences
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    • 제6권2호
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    • pp.205-209
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    • 1993
  • A new treatment system for animal waste water has been developed as an alternative to the activated sludge process. It consists of two treatments; one is operated with 7 tanks, and the other is soil and plant cultivation bed. Aerobic microorganisms are added to the influent water in the tanks where the water is aerated so that the microbes utilize the pollutants, while sedimentation removes the indigestible solids. In the secondary treatment the water, which has already received a primary treatment, is filtered through soil where it also receives treatment by soil organisms. In addition there is transpiration of water and absorption of minerals by plants. In the primary treatment BOD, SS, coliforms (E. coli), TP and total bacteria were removed 79-99%, but COD and TN were removed only 58% and 36%, respectively. In the secondary treatment removal of nutrients proceeded further, and 93-99% of pollutants were removed. The treated waters met the quality standard of discharge water in Japan except for TN, which was in too great a concentration to meet discharge standards. This problem requires further study.

Atmospheric correction algorithms for satellite ocean color data: performance comparison of "OCTS-type" and "CZCS-type" algorithms

  • Fukushima, Hajime;Mitomi, Yasushi;Otake, Takashi;Toratani, Mitshiro
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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    • pp.307-312
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    • 1998
  • The paper first describes the atmospheric correction algorithm for the Ocean Color and Temperature Scanner (OCTS) visible band data used at Earth Observation Center (EOC) of National Space Development Agency of Japan (NASDA). It uses 10 candidate aerosol models including "Asian dust model" introduced in consideration of the unique feature of aerosols over the east Asian waters. Based on the observations at 670 and 865 nm bands where the reflectance of the water body can be discarded, the algorithm selects a pair of aerosol models that accounts best for the observed spectral reflectances to synthesize the aerosol reflectance in other bands. The paper also evaluates the performance of the algorithm by comparing the satellite estimates of water-leaving radiance and chlorophyll-a concentration with selected buoy-and ship-measured data. In comparison with the old CZCS-type atmospheric correction algorithm where the aerosol reflectance is as-sumed to be spectrally independent, the OCTS algorithm records factor 2-3 less error in estimating the normalized water-leaving radiances. In terms of chlorophyll-a concentration estimation, however, the accuracy stays vey similar compared to that of the CZCS-type algorithm. This is considered to be due to the nature of in-water algorithm which relies on spectral ratio of water-leaving radiances.

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위성해색자료의 대기보정 알고리즘 : OCTS-type과 CZCS-type 알고리즘의 성능비교 (Atmospheric correction algorithms for satellite ocean color data: performance comparison of "CTS-type" and "CZCS-type" algorithms)

  • Hajime Fukushima;Yasushi Mitomi;Takashi Otake;Mitsuhiro Toratani
    • 대한원격탐사학회지
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    • 제14권3호
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    • pp.262-276
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    • 1998
  • The paper first describes the atmospheric correction algorithm for the Ocean Color and Temperature Scanner (OCTS) visible band data used at Earth Observation Center (EOC) of National Space Development Agenrr of japan (NASDA). It uses 10 candidate aerosol models including "Asian dust model" introduced in consideration of the unique feature of aerosols over the east Asian waters. Based on the observations at 670 and 865 nm bands where the reflectance of the water body can be discarded, the algorithm selects a pair of aerosol models that accounts best for the observed spectral reflectances to synthesize the aerosol reflectance in other bands. The paper also evaluates the performance of the algorithm by comparing the satellite estimates of water-leaving radiance and chlorophyll-a concentration with selected buoy- and ship-measured data. In comparison with the old CZCS-type atmospheric correction algorithm where the aerosol reflectance is assumed to be spectrally independent, the OCTS algorithm records factor 2-3 less error in estimating the normalized water-leaving radiances. In terms of chlorophyll-a concentration estimation, however, the accuracy stays very similar compared to that of the CZCS-type algorithm. This is considered to be due to the nature of in-water algorithm which relies on spectral ratio of water-leaving radiances.

동아시아 몬순 지역에서 IODM과 ENSO의 영향 : NCAR Community Atmospheric Model을 이용한 모의 실험 (Impact of IODM and ENSO on the East Asian Monsoon: Simulations through NCAR Community Atmospheric Model)

  • 오재호
    • 한국농림기상학회지
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    • 제7권4호
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    • pp.240-249
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    • 2005
  • 일반적으로 인도양 동쪽 해수면 온도는 따뜻하고, 서쪽 해수면 온도는 차갑다. 이러한 인도양 동/서쪽의 해수면 온도 변화는 인도 해양 다이폴 현상(Indian Ocean Dipole Mode, IODM)이 그 원인이다. 다이폴의 양의 위상은 서쪽 인도양에 양의 SST 아노말 리가 나타나고, 남동 인도양에는 음의 SST 아노말리가 나타나고 음의 위상은 이와 반대의 SST 아노말리가 나타난다. 반면 태평양의 경우, 일반적으로 서쪽 해수면 온도는 따뜻하고, 동쪽 해수면 온도는 차갑다. 중앙/동(서) 태평양 해양의 양(음)의 SST 아노말리가 현상이 나타날 때는 엘니뇨 시기이다. 이와 반대의 SST 아노말리 현상은 라니냐 시기이다 이러한 태평양의 대기-해양간의 상호작용으로 나타나는 현상을 엘니뇨 난방진동(El Nino Southern Oscillation, ENSO)이라 한다. 본 연구에서는 IODM과 ENSO현상에 따른 동아시아 몬순 변동성을 분석하기 위해 관측자료와 NCAR MCA모델 자료를 사용하였다 IODM과 ENSO 현상과 관련된 SST 아노말리 5가지 실험을 수행하였다. IDO모드는 최고의 값이 나타난 이후 약 $3\~4$계절의 시간 지연을 가지고 동아시아의 여름 몬순 활동에 영향을 주는 반면, ENSO는 동아시아 여름 몬순과 같은 계절에 영향을 준다. IODM 음(양의)위상과 태평양에서의 엘니뇨(라니냐) 현상은 한국과 일본지역에서 몬순 활동을 강화(억제)하는 역할을 한다. 반면 중국 지역에서는 IDOM과 몬순 변동성과는 별다른 연관성이 없는 것으로 나타났다. 그러나 엘니뇨(라니냐)일 때, 중국 지역에서 몬순 활동은 억제(강화)되는 경향을 보였다. IODM은 북태평양 아열대 고기압이 강화 할 때 나타나고, ENSO는 북서 태평양 알류산 저기압의 영향으로 나타난다. 따라서 태평양으로부터 동아시아 쪽으로의 수분 공급은 아열대 고기압과 알류산 저기압의 강화/약화에 의해 결정된다.

동아시아 해양안보협력 발전방안 (Developmental Direction for East Asia Maritime Security Cooperation)

  • 박응수
    • 한국정보통신학회논문지
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    • 제20권8호
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    • pp.1596-1606
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    • 2016
  • 오늘날 해양은 세계경제를 견인하는 무역의 통로일 뿐만 아니라, 국가를 부강하게 하는 각종 자원의 보고이기도 하다. 최신과학기술의 발전으로 인류의 활동역시 육지에서 해양으로 점점 확대되고 있다. 근래 동아시아 국가들 역시 이러한 해양의 가치를 인식하고 해양에서의 자국의 권익을 경쟁적으로 추구하고 있다. 이로 인해 아시아 해역에 국가 간 분쟁이 고조되고 있다. 반면에 이러한 해양안보문제를 해결할 국제 안보조직이나 수단은 해결해야할 문제의 크기나 복잡성에 비해 대단히 부족하다. 이를 해결하기 위해서는 아시아 국가들이 냉정하게 현실을 직시하고 지혜를 모아 역내 해양안보문제의 범위와 의제들을 재점검해야 한다. 또한 그동안 시행되었던 제반 안보협력의 과정이나 결과도 재평가하여 현재의 해양안보문제를 효율적으로 관리하고 해결해 나가야 한다. 만약 우리가 이러한 문제들을 성공적으로 해결해 낸다면, 현재와 같이 불안한 아시아의 바다는 '평화와 번영의 바다'로 변화될 것이다.

Molecular diversity and morphology of the genus Actinotrichia (Galaxauraceae, Rhodophyta) from the western Pacific, with a new record of A. robusta in the Andaman Sea

  • Wiriyadamrikul, Jutarat;Lewmanomont, Khanjanapaj;Boo, Sung Min
    • ALGAE
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    • 제28권1호
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    • pp.53-62
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    • 2013
  • Actinotrichia is a calcified galaxauracean red algal genus with temperate and tropical distributions in the Indian and Pacific Oceans. Morphological characteristics, along with rbcL and cox1 sequences, were analyzed from specimens collected in the western Pacific and the Indian Oceans. Both rbcL and cox1 data confirmed the occurrence of A. fragilis, A. robusta, and Actinotrichia sp. in this region. The presence of A. fragilis was verified in tropical Indo-Pacific and temperate northeast Asian waters and was characterized by high genetic diversity. Although A. robusta commonly occurs in the East China Sea, we confirmed its presence on rocks and crustose algae in the subtidal zone of three islands in the Andaman Sea. Actinotrichia sp. was similar to A. calcea in morphology and distribution, but with sufficiently different sequences, thus, additional sampling over the range will enable a more realistic evaluation of its taxonomic status.

Grateloupia jejuensis (Halymeniales, Rhodophyta): a new species previously confused with G. elata and G. cornea in Korea

  • Kim, Su Yeon;Han, Eun Gyu;Kim, Myung Sook;Park, Jung Kwang;Boo, Sung Min
    • ALGAE
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    • 제28권3호
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    • pp.233-240
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    • 2013
  • Despite specimens' large size and ease of collection in northeast Asian waters, the species diversity of the genus Grateloupia still needs more research in Korea. We investigated plastid rbcL sequences and carried out detailed morphological observation on flattened halymeniacean red alga collected in twelve locations around Korea and Japan. We describe Grateloupia jejuensis sp. nov. based on the distinct clade with high support in our rbcL tree. Grateloupia jejuensis is characterized by solitary or caespitose habit and flattened thalli with discoid holdfast, cartilaginous texture, and blunt or bifid axis. Grateloupia jejuensis was distantly related to G. elata and G. cornea, which have been morphologically confused with the former, and it formed a sister relationship with Prionitis filiformis from California, USA in the rbcL tree.