Specificity of catches has been analyzed to japanese tuna purse seine A principle component analysis was used to improve the efficiency of fishing and increase sustainable production and productivity of Korean tuna purse seine.The result are as follows;From the principal component analysis of the fish catches, the first principal component(Z1) to promote principal component score was skipjack Kastsuwonus Pelamis, LINNAEUS and yellowfin tuna Thunnus Albacares, BONNATERRE (Small : smaller than 10kg) and proportion was 86.8% of total. The second principal component(Z2) to increase principal component score was yellowfin tuna (Large : larger than 10kg) and proportion was 9.5%.On the other hand, fish operating that have caught skipjack and yellowfin tuna (Small and Larger) was not so much. Fish catches for one species raised volume of the catches while catches for multi-species decreased it since principal composition score for one species and both species together has been increased.Fish school could be divided into three groups of schools each of which was associated with drift objects, payaho and ship, school associated with shark, whale and porpoise and school of breezing, feeding and jumping from proportion of principal component analysis for fish catches of school types. However, the biological pattern is different among school associated with ship, payaho and school associated with drift objects for analysis eigen vector. School associated with ship, payaho and school associated with drifting object associated is judged as school which be assembled to vessel and drifted log temporary.

It was investigated that the condition of fishing ground gave what kind of effect school type in relation to the property for the target school after the vertical temperature profile and school type were observed when tuna purse seiner for tuna purse seine was operated in the western pacific Ocean around the equator between December 12, 1993 and January 26, 1994. The results are as follows;1. This study divided fish schools associated with drift objects, a one targeted-operation, and the pelagic migrating fish schools that are another one for the property. The total of 23 operations were complected including 6 that targeted fish schools associated with drift objects and 17 that targeted pelagic migrating fish schools. It was known that the main operation was conducted on pelagic migrating fish school.2. Average and standard deviation of the depth of the surface mixing layer was 86.0m and 13.8m for fish schools associated with drift objects. 61.6m and 13.0m for pelagic migrating fish schools, respectively. The average depth of the surface mixing layer of the pelagic migrating fish schools was lower when compared to the fish schools associated with drift objects however the concentration of standard deviation was higher than those fish schools associated with drifted objects. Accordingly, it was assumed that the effect of vertical temperature profile for pelagic migrating fish school was higher than the fish schools associated with drift objects.

Temperal and spacial analysis for catches have been drawing up a catch distribution chart and analysing catches and CPUE(Catch Per Unit Effort) using catch data with purpose of obtaining basic data to establish a selective method of effective fishing the tuna purse seine fishing ground.The temperature profile section and catch was surveyed to analyse the effect of catch in relation to the fishing ground environment.The results are as follows ;1. As for the catch variation between 1983 and 1984, the catch mainly took place on150˚E, and after that it moved eastward enlarging the range of catch. In the monthly catch variation between January and February, the catches mainly happened on 135˚~ 150˚E, and then moved to the gradually westward. However, from July it moved to the South and from October Southeast.2. As to the eatch ratio for the school associated with the drifted object, the pelagic migrating school and the school associated with the biological objects, the catch ratio for the school associated with the drift objects was the highest. The catch ratio for the school associated with the drifted object was high in June, July and November whiles between January and March for the pelagic migrating school.3. SST(Sea Surface Temperature) was around 28~29〈/TEX〉C〈/TEX〉 on the observing line of 137˚E〈/TEX〉 and the catches took place in the north equatorial counter-current situated on around 5˚~6˚N. SST in the northern summer was 1〈/TEX〉C〈/TEX〉higher than winter and it was about 29~30〈/TEX〉C〈/TEX〉. The catch happened with the center of north equatorial counter-current. The reason why the catch mainly took place on the north equatorial counter-current is that main catch of tuna purse seine was the school associated with drift objects. It is thought that the fishing grounds are made in waters that have many drift objects like drift logs from the coast.

이전의 연구에서 하중증분법을 이용하여 지점 변위를 일으키고 자중. 부력, 그리고 조류력을 받는 해양케이블의 초기평형 상태를 결정하였다 본 연구에서는 이 상태를 기준으로 동적으로 지점운동 또는 지진하중에 대하여 첨가질량 및 케이블운동에 의한 Morison force를 고려한 해양케이블의 동적 비선형해석을 수행한다 지점운동과 지진력을 받는 수중케이블에 대하여 기하학적인 비선형해석을 수행하고 해석결과의 분석을 통하여 해양케이블의 동특성을 파악한다.

본 연구에서는 국립수산진흥원 소속 부산 851호에 의해 1987~1990년 (4개년)과 1992~1993년 (2개년)의 하계 (7~9월)에 북태평양 (34˚~47˚N, 150˚ E~170˚W)에서 오징어채낚기 (오징어손줄낚시)에 의해 시험조업하여 어획된 6종의 오징어를 대상으로 하여 분석한 오징어종류별 어획수충, 해양환경(수온, 염분) 및 어획률을 분석하였으며 그 결과는 다음과 같다. 1. 문어오징어는 아한대영역의 위도 41˚~43˚N 인 71~80m 수층의 수온 6~11℃, 염분 33.2~33.6‰인 해역에서 높은 어획률을 보였다. 2. 갈구리오징어는 아한대영역의 위도 41˚~42˚N인11~20m 수층의 수온 10~12℃, 염분 32.9~33.6‰인 해역에서 높은 어획률을 보였다. 3. 살오징어는 아한대영역 및 이행영역의 위도 40˚ 및 42˚N인 11~20m 수층의 수온 15~18℃,염분 33.6~34.0‰인 해역에서 높은 어획률을 보였다. 4. 빨강오징어는 아한대수렴선 및 이행영역의 위도 39˚~41˚N인 표층~10m 수층의 수온 16~17℃, 염분 33.7~34.4‰인 해역에서 높은 어획률을 보였다. 5. 두줄무늬빨강오징어는 아열대영역의 위도 37˚~39˚N인 11~20m 수층의 수온 18~20℃, 염분 33.8~34.6‰인 해역에서 높은 어획률을 보였다. 6. 노랑점빨강오징어는 아열대영역의 위도 36˚~37˚N인 표층~10m 수층의 수온 24~25℃, 염분 34.2~34.4‰‰ 인 해역에서 높은 어획률을 보였다.

The saury stick - held dip net fishery of Korea in the Northwest Pacific Ocean began in 1985 with 3 vessels. Since then the fishery has grown so rapidly year by year that the number of vessels increased to 34 and the catch to 40 thousands Mff in 1993. In the present study, the monthly situation and the movement of the fishing ground for the pacific saury in the Northwest Pacific were investigated and the monthly optimum fIshing tempertures were estimated, from the relationship between the catch and the sea surface temperature. In the beginning of the fishing season, June to August, the fIshing ground is formed in the very wide range, mainly in the northward area of the front meandering, as the parcific saury migrate northward. In the main season, September to November, the ground is formed in the southward area of the front, off the east coast of Japan. Andd then, the fishing season ends in December with the ground coming near to the east coast of Japan. The monthly optimum fishing tempertures showed 11~13℃. in June to July, 13-17℃. in August to November, and 15~ 17℃. in December in general. The profIles of water temperature were much different in accordance by net casting position in the fishing ground, regardless of season. So, the MLD and CPUE was analyzed to find out the relation between the water temperature and the catch. Then, it is found that the CPUE shows over 0.7Mtr/haul as the MLD 40~70m.40~70m.

This paper described on relation between the catches of tuna and the distribution of water temperature of eastern fishing ground of Tropical region in the Pacific Ocean. The data of catches and water temperature used in this paper were based log book which # 27 CHENG RONG(Gross tonnage : 399 ton) had been worked eastern fishing ground(Lat : 09˚N- 14˚S, Long : 115˚- 149˚W)from January to October, 1991. The obtained result are as follows : 1. On the relation between the catches and the geographical distribution, bigeye tuna was higher catches at Lat 4˚- 9˚N, Long 135˚- 139˚W area in the equatorial counter current region where surface water temperature was range of 27.5℃ to 27.9℃, yellowfin tuna was higher catches at Lat 4˚- 9˚S, Long 145˚- 149˚W in the south equatorial current region where surface water temperature was range of 28.0℃ to 28.4℃ and albacore tuna was higher catches at Lat 10˚- 14˚S, Long 120˚- 124˚W area in the south equatorial current region where surface temperature was range of 26.5℃ to 26.9℃ 2. On the relation between catches and distribution of vertical water temperature, bigeye tuna was higher catches at the water temperature of 10℃ to 12℃ on depth layer between 300m and 360m, yellowfin tuna was higher catches at the water temperature of 15℃ to 19℃ on depth layer between 180m and 280m and albacore tuna was higher catches at the water temperature of 12℃ to 14℃ on depth layer between 280m and 310m. Above the result, it seemed that bigeye tuna distributed deeper layer than yellowfin and albacore tuna.

There are numerous mapping, charting, geodetic systems and electronic digital products defined in various local geodetic datum. It becomes a straight forward requirement to simplify the complexity by referencing all the products to a common reference globally. WGS-84 is well known as a state-of-the-art global reference system based on the use of data, techniques and technology available within American Defence Mapping Agency(DMA). Its parameters can be translated into more accurate maps, charts and geodetic positioning compared to others previously. Since Global Positioning System(GPS/NAVSTAR), which is asssociated with World Geodetic System(WGS-84)in reference frame, has been widely used, the unified geodetic system has been required for GPS users in many fields.

북태평양 오징어 유자망어장의 표면수온과 어획량의 변화에 의한 어장의 수평분포를 최근 4개년간(1986~1989)의 주어기(5~10월)에 한국 어업기술훈련소, 국립수산진흥원, 일본 북해도대학, 대림수산(주), 오양수산(주) 등이 작성한 해양관측자료에서 발췌한 표면수온자료와 한국 어업기술훈련소 실습선과 이 어업에 종사한 어선 5척에서 조사한 어획량의 자료를 위도 1˚, 경도 2˚ 간격으로 구획한 해구에 대하여 전질처리한 평균표면수온과 단위노력당어획량을 월별로 분석하면 다음과 같다. 1. 어장형성범위는 5월에는 35˚~40˚N, 178˚~166˚W , 6월에는 36˚~41˚N, 178˚E~166˚W, 7월에는 38˚~44˚N, 170˚E~170˚W, 8월에는 39˚~44˚N, 144˚~180˚E, 9월에는 39˚~44˚N, 144˚~170˚E, 10월에는 40˚~44˚N, 144˚~154˚E였다. 2. 어장의 분산은 5, 6, 10월에는 경도방향과 위도방향의 해구수가 거의 같았고, 7, 8, 9월에는 경도방향의 해구수가 많았으며, 특히 8월은 1년중 경도방향의 분산이 가장 컸고, 어장중심은 5월에는 3888해구, 6월에는 3884해구, 7월에는 4078해구, 8월에는 4154해구, 9월에는 4146해구, 10월에는 4044해구였다. 3. 어획수온과 어획적수온은 5월에는 14.0~18.5℃, 15.0~16.0℃, 6월에는 13.5~18.5℃, 14.5~16.0℃, 7월에는 14.0~20.0℃, 14.5℃, 19.0℃, 8월에는 16.0~21.5℃, 18.0~20.0℃, 9월에는 14.5~22.0℃, 17.0~18.5℃, 10월 14.0~18.0℃, 16.0~17.0℃였다. 4. 평균CPUE는 5월에는 3.2kg/sheet, 6월에는 4.5kg/sheet, 7월에는 4.3kg/sheet, 8월에는 5.1kg/sheet, 9월에는 6.4kg/sheet, 10월에는 5.8kg/sheet였다. 5. 한국정부의 1990년 북태평양 오징어 어업감시계획과 실제의 어장형성범위를 비교하면 5월에는 어장이 형성된 21개 해구 가운데 12개, 6월에는 24개 가운데 7개, 7월에는 25개 가운데 4개 해구에서 조업이 규제되고, 8월 이후의 어장에서는 어업규제수역에 해당되는 해구가 없는 것으로 나타났다.

해양지각이 생성되는 중앙해령의 지진파의 속도구조와 공극을 가진 암석의 탄성이론을 이용하여 해양지각 상부의 공극률과 공극의 모양을 조사하였다. 해양지각 최상부에서 지진파의 속도는 공극이 전혀없는 현무암의 지진파의 속도(약 6㎞/sec)에 비해 대단히 낮고 (2.6㎞/sec) 이 속도는 상부지각 500m 내에서 급속히 증가하여 4.8㎞/sec에 달한다. Hashin-Strickman의 최고최저 공극률범위이론, Watt의 일관성이론(self-consistency theory), 그리고 Toksoz의 비상호작용이론(non-interactive theory)를 적용하면 상부지각 500m에서 지진파의 급속한 증가는 지각 최상부의 20-40%의 큰 공극률이 지하로 내려감에 따라 압력의 증가로 약 10%로 급속히 감소하는 것으로 설명될 수 있다. 지하 500m에서 2㎞사이에서는 중앙해령과 평행한 방향으로의 지진파의 속도(6㎞/sec)가 중앙해령과 수직한 방향의 지진파의 속도(5.4㎞/sec)보다 빠른데 이는 중앙해령과 평행한 방향으로 발달한 납작한 모양의 공극에기인하는 것으로 사료된다. 공극을 가진 암석의 탄성이론에 의하면 공극의 종횡률(aspect ratio)이 10^(-1)∼10³정도이면 1-3%의 낮은 공극률로도 중앙해령 상부지각에 나타난 지진파의 방향성(anisotropy)을 설명할 수 있다.

The author investigated the relation between the catches of tuna species and the distribution of horizontal mean temperature at the Jepth of 10m and of vertical temperture sections in the different fishing grounds, using the date of catches in 1980, showing a relative good ones during six years from 1975 to 1980, and of oceanographic observations. Yellowfin and bigeye are mainly caught in South Equatorial Current regions including equatorial upwelling region in 5˚N to 5˚S, and albacore is mainly caught in Subtropical region in 20˚5 to 40˚5. The good fishing grounds of yellowfin and bigeye are made in the depth layer of 100 m to 250 m and temperature of 15˚C to 26˚C having a smooth gradient of thermocline in the Central Pacific between 180˚ and 1500W. But albacore is caught well in which the temperature of thermocline ranges from 100e to 25˚C and its gradient very smoothly. Approaching to the American Continent, the catches of yellowfin and big eye decrease because the thermocline becomes shallower and steeper at Eastern Pacific Region between 1500 and 800W.

The fishing conditions of flying squid, ommastrePhes barsram(Lesueur), in the North Pacific Ocean was studied based on the horizontal water temperature data, satellite data from NOAA and statistical data of flying squid fisheries which were collected from 1980 to 1984. The obtained results were as follows; 1. Since 1979, the Korean drift giIlnet fishery for flying squid was launched in North Pacific. Number of operating vessel and catch of flying squid increased gradually every year. The number of vessels were 111 and their annual catches were 42, 977 M/T in 1984. Therefore, Korean drift giIlnet fishery for this species has played an important role in the products of Korean high-sea fisheries. 2. In the beginning of the fisheries, fishing grounds was formed in the west of long. 1800E. In 1982, in consequence of the center which extended eastward, the fishing ground was formed long. 166˚W in the central North Pacific Ocean. Since 1983, the fishing grounds were formed as far as long. 161˚W. The range of general fishing season in the central North Pacific was from June to August. After september, fishing ground was shifted to the west, in the Northwestern Pacific. 3. The Predominant fishing season for the flying squid was August through January of the coming year. Optimum water temperature for flying sguid at surface layer in the Pacific Ocean ranged from 11 ˚e to 17˚e in winter, 13˚e to 17˚e in spring, 12. 8˚C to 19.7˚e in summer and 1O.6˚e -18.7˚e in fall. 4. In summer, the Oceanographic condition in the North Pacific Ocean showed that the water temperature at surface layer was lower in 1980, 1983 and higher in 1981, 1982 and 1984 as compared with mean annual water temperature. 5. The characteristics df oceanographic conditions in the fluation, disformation, mixing and other factors of the Kuroshio and Oyashio currents, which have considerably influenced upon the water masses of the areas. 6. The data and information on surface thermal Structure interpreted from Infrared Satellite Imaginary from NOAA-7 and NOAA-8 are very available in estimating water temperature on the areas and investigating the major fishing grounds. 7. According to the fisheries statics of Japanese drift gilInet, the annual catches of flying squid considerably decreased from 225, 942 M/T in 1983 to 133, 217 M/T in 1984. 8. The fishing grounds in the central North Pacific in several fishing seasons were formed as follows: In June, the initial fishing season, the fishing grounds were formed in the vicinity of lat. 35 - 40oN, the central North Pacific east of 179˚E. In July, the fishing ground were formed in the wide arEa of the central North Pacific north of 400N and long. 174˚E-145˚W In Auguest, concentrative fishing operation carried out in :he central North Pacific north of 43˚N and East of 165˚W. On the other hand, in September, main fishing grounds were disappeared and moved to the west.

There has been established bilateral and multilateral agreements of fisheries in the North Pacific, such as, the Agreements of International North Pacific Fisheries Commission, of Japan-Soviet Fisheries Commission for the Northwest Pacific and of the Furseal and King Crab. The auther reviewed these agreements and discussed about the growth of the International Fisheries Agreements in the future. This paper concerns with the present status of demersal resources which are important in commercial fisheries and caught in the North Pacific.

Oceanography of the Subarctic North Pacific Ocean is reviewed. The submarine topography and the current systems in the region are explained. Recent serial observation data reveals that. though the upper mixed layer of low salinity is relatively thick. the pattern of the property distribution in winter is essencially similar to that in summer. Alaskan Stream Extension Water. which influences the abundance and the location of demersal fishes. extends northward to 58˚ N Lat in the Bering Sea. A southeastward intrusion of the Bering Borcal Cold Water causes the formation of a sharp oceanic front. where the demersal fishes such as Alaska pollacks and cods arc concentrated. The Alaska pollacks seem to avoid the low salinity water of the Alaskan Coastal Water.

자연계에서 산출되는 망가니즈단괴 내 광물종 및 원소의 공간적 분포를 규명하는 것은 단괴의 형성 과정 중 변화하는 생성 환경 및 지화학적 조건에 대한 이해를 가능하게 한다. 최근의 라만 분광분석을 이용한 연구에서 구형으로 성장한 단괴의 성장에 따른 산화망가니즈 광물종의 변화에 대해 연구한 바 있으나, 상대적 으로 천해에서 획득되는 비구형 단괴 내 광물종의 분포는 자세히 연구되지 않았다. 이에 본 연구에서는, 동 시베리아해 천해(수심 약 73 m)에서 산출되는 판상의 비구형 망가니즈단괴 내 서로 다른 성장 방향에서 획득 된 라만 분광분석 결과를 바탕으로 단괴 내 광물종 및 해당 광물의 구조적 특성에 대하여 면밀히 연구하였 다. 또한 에너지분산형 X-선 분광분석(energy dispersive spectroscopy, EDS)을 통하여 단괴 내부 구조 및 부 수광물의 존재에 대하여도 관찰을 수행하였다. 그 결과, 본 연구에서 사용한 비구형 단괴의 내부는 중심으로 부터 외곽 방향으로 크게 핵, 철 기질부, Mn-Fe 층으로 구분되었다. Mn-Fe 층 내 서로 다른 성장 방향에서 획 득된 라만 분광분석 결과는 모든 방향에 대하여, 단괴 중심부로부터 외곽부로 신호 획득위치가 옮겨감에 따 라 산화망가니즈 광물의 경우 터널형 광물의 비율이 감소하는 경향성을 관찰할 수 있었다. 이 때, 단괴 내 성 장 방향에 따라 구성 광물의 상대적 비율 및 구조적 특성이 크게 다르다는 것이 확인되었다. 총 3가지의 실험 방향 중, 한 방향에서 획득된 라만 분광분석 결과는, 철 수산화물의 비율이 낮고, 버네사이트나 토도로카이트 와 같은 산화망가니즈 광물들의 결정도가 상당히 높다는 것을 보여주었다. 반면, 나머지 두 방향에서 획득된 신호를 분석한 결과, 산화망가니즈 광물들의 결정도가 매우 낮으며 비정질 내지는 결정도가 낮은 철 수산화 물들의 비율이 높다는 것이 확인되었다. 이러한 결과는 비구형 단괴가 속성 과정으로 형성되는 동안 단일 단괴 내에서도 지화학적 조건에 차이가 있었다는 것을 지시한다. 더하여, 부수광물로서 암염이 일부 층에서 관찰되는 것을 확인할 수 있었다. 이는 단괴 내 존재하던 해수의 증발로 인해 암염 결정이 형성되었음을 지시한다. 이 처럼 본 연구에서는 라만 분광분석을 통해 비구형 단괴 내 광물종의 분포 및 구조적 특성에 대해 제시하였 고 향후 본 연구 방법은 다양한 단괴 연구에 적용되어 지구물질의 지질학적 형성 과정에 대한 보다 세밀한 이해를 가능하게 할 것으로 기대된다.

The effect of coupled data assimilation (DA) on the meteorological prediction in the west coastal region of Korea was evaluated using a coupled atmosphere-ocean model (e.g., COAWST) in the spring (March 17􎂡26) of 2019. We performed two sets of simulation experiments: (1) with the coupled DA (i.e., COAWST_DA) and (2) without the coupled DA (i.e., COAWST_BASE). Overall, compared with the COAWST_BASE simulation, the COAWST_DA simulation showed good agreement in the spatial and temporal variations of meteorological variables (sea surface temperature, air temperature, wind speed, and relative humidity) with those of the observations. In particular, the effect of the coupled DA on wind speed was greatly improved. This might be primarily due to the prediction improvement of the sea surface temperature resulting from the coupled DA in the study area. In addition, the improvement of meteorological prediction in COAWST_DA simulation was also confirmed by the comparative analysis between SST and other meteorological variables (sea surface wind speed and pressure variation).

이 연구는 한국해양과학기술원 동해연구소 독도전문연구센터가 동해의 바닷속 펼쳐진 거대한 독도의 해양영토를 밝히고 그 가치를 찾아 한국의 영토로서 확고한 주권확립과 이용관리에 기여하고 있으며, 과학연구 활동으로 많은 성과를 이루어내고 있기 때문에 독도 해양과학연구 성과를 중심으로 홍보현황과 활성화 방안에 대하여 조사와 분석을 한 것이다. 이 독도전문연구센터는 2006년도에 설립되어 올해 16년째 독도 해양과학연구를 꾸준 히 하고 있으며, 축적된 연구 성과에 대하여 홍보를 하였다. 이러한 독도 해양과학연구 성과의 홍보 방법으로는 학술논문, 학술활동, 특허, 서적출간, 언론홍보, 전시회 및 학술행 사, 독도관련 화보집, 총서와 독도체험시스템 등이 있다. 독도전문연구센터의 독도 해양과 학연구 성과의 홍보현황을 보면 2006년부터 2020년까지 학술논문은 82편, 학술발표 226편, 특허 11건, 서적 35종, 언론홍보 1158건, 전시회 32건, 학술행사(워크숍, 세미나, 심포지엄 등) 227건, 대중강연 107건, 견학(방문) 791건, 자료제공 226건 등 약 3천건 정도로 집계되었다. 독도 시민단체와 반크 등 일반인의 독도 홍보활동은 많이 이루어지고 있지만, 독도 해양과학 연구자들의 독도 성과와 홍보에 관한 것은 아직 충분치 않은 실정이 라고 할 수 있다. 그래서 본고에서는 다음과 같은 활성화 방안을 제시하였다. 첫째, 새로운 해양, 해저지형 표기에 있어서 동도, 서도 외 89개 부속 섬의 전체 바위명칭 부여 및 지도, 리플릿 제작 배포가 필요하다. 둘째, 독도 이용개발에 있어서 육상의 경우에는 자연환 경에 의한 풍화작용 등의 영향으로 바위가 훼손되는 현상을 지속적으로 모니터링 해야 한다. 셋째, 독도 해양 및 환경자료 활용을 확대하여 독도 통합관측시스템을 구축 및 운영하 여 실시간 서비스 제공도 지속적이어야 한다.

In this study, we quantitatively analyze the effect of ocean emission sources on the simulated O3 concentrations in South Korea using the community multi-scale air quality (CMAQ) model. To analyze changes in O3 concentrations by ocean emissions, two different CMAQ simulations considering ocean emissions (OE case) and without considering ocean emissions (NE case) were conducted during the Korea-United States air quality (KORUS-AQ) campaign period (May–June 2016). The changes in the simulated O3 concentrations due to the effect of ocean emissions (OE case-NE case) appeared mostly in the ocean areas (+1.201 ppbv). The effect of ocean emissions was positive during the daytime (+1.813 ppbv), but negative during the nighttime (–0.612 ppbv). Analysis using the integrated process rate (IPR) confirmed that the increase or decrease in O3 concentration by ocean emissions was mainly due to chemical processes. Further analysis using the integrated reaction rate (IRR) showed that the daytime increase in O3 concentration was mainly attributable to the increased O3 production via O + O2 + M → O3 + M reaction as photolysis of NO2 increased due to the added ocean emissions. The nighttime decrease in O3 concentration was mainly due to the increased O3 titration by NO (NO + O3 → O2 + NO2) due to the increased NO emission. These results indicate that the changes in the concentration O3 in the sea area by the effect of ocean emissions are mainly due to increased NOx emissions. However, there could be a number of uncertainties in ocean emissions data used in this study, thus continuous comparative research using the most updated data will need to be carried out in the future.