https://repository.kopri.re.kr/handle/201206/5506 Tue, 28 Apr 2026 16:30:24 GMT 2026-04-28T16:30:24Z https://repository.kopri.re.kr/handle/201206/6063 Title: Distribution of net community production and surface pCO2 in the Scotia Sea, Antarctica, during austral spring 2001 Authors: KANG, YOUNG CHUL; Kim, Dongseon; Shim, J.; Choi, Sang-Haeng Abstract: Surface and water column measurements of pCO2, alkalinity, and nutrients were made in the Scotia Sea in December 2001. From 54°S to 60°S along 52°W, pCO2, TCO2, and nutrients in surface seawater increased southward. The pCO2 concentration ranged from 370 ？atm in the north to 420 ？atm in the south and increased abruptly across the Polar and Scotia fronts by about 10？20 ？atm. Net community production values from the preceding winter to the observation time were calculated at stations south of the Polar Front;values ranged from 1.0？1.2 mol m-2 and were comparable to other Southern Ocean measurements in summer, in or during an algal bloom. Processes affecting the surface pCO2 distribution (e.g., thermodynamical change, air？sea exchange, biological production, and physical mixing) were evaluated from the preceding winter to the observation time at the stations. Seasonal warming increased surface pCO2 at rates of 0.08 to 0.27 ？atm d-1;the highest values were observed at the station closest to the Polar Front. The air？sea exchange decreased surface pCO2 at rates of -0.08 to -0.23 ？atm d-1, suggesting that the area around the study stations acted as a weak CO2 source during the study period. The surface pCO2 variation caused by biological production was -0.24 to -0.30 ？atm d-1 and was high south of the Scotia Front, where concentrations of chlorophyll a, biomass, and particulate Fe were relatively high. Physical mixing promoted an increase of 0.16 to 0.47 ？atm d-1 in surface pCO2, a substantial contribution to total variation in pCO2. This result contrasts with patterns in other Southern Ocean regions, where physical mixing was considered to be minimal or was ignored in previous studies. At station WS 8 in the Weddell-Scotia Confluence region, mixing was the dominant process of surface pCO2 change during the study period, suggesting lateral and vertical transport of CO2-rich water masses from the Weddell Sun, 01 Jan 2006 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6063 2006-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6018 Title: Biogeochemical cycle of organic matter in a subtidal benthic environment in Marian Cove, King George Island, Antarctica Authors: Han, Myung Woo; KANG, YOUNG CHUL; Shim, J.; Kim, Dongseon Abstract: The flux and composition of settling particles were measured in a subtidal benthic environment of Marian Cove, King George Island, from February 1998 to January 2000. The total mass flux ranged between 24.7 g/m2/d (August and September 1998) and 21.97 g/m2/d (February 1999), and showed distint seasonal variation: high in summer and low in winter. Lithogenic particles constituted 70-95% of the total particles, while biogenic particles represented only 10%, except in spring when biogenic particles made up more than 30%. The fluxes of organic carbon biogenic silica, nitrogen, and organic phophorus all peaked in spring rather than in summer, with ranges of 4.4-34.0, 1.2-23.5, 0.48-5.56, and 0.01-0.15 mmol/m2/d, respectively. Fluxes of metals (Al, Ti, Cu, CD, and Pb) showed temporal variability, similar to that of the total mass flux, but each metal had different enrichment factor (EF) values. The EF value of Cu correlated positively with fluxes in lithogenic components, while the EF value of CD crrelated with biogenic particle fluxes. The Cu flux is mainly related to substantial inflows of meltwater laden with Cu-enriched lithogenic particles. The Cd flux is probably associated with organic matter deposition following phytoplankton blooms in the water column. Sat, 01 Jan 2005 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6018 2005-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6679 Title: Stable Carbon and Nitrogen Isotopes of Sinking Particles in the Eastern Bransfield Strait (Antarctica) Authors: Shin, Hyoung Chul; Kim, Dongseon; Keun, Khim Boo; Kim, Dong Yup Abstract: A time-series sediment trap was deployed at 1,034m water depth in the eastern Bransfield Strait for a complete year from December 25, 1998 to December 24, 1999. About 99% of total mass flux was trapped during an austral summer, showing distinct seasonal variation. Biogenic particles (biogenicopal, particulate organic carbon, and calcium carbonate) account for about two thirds of annual total mass flux (49.2 g m？2), among which biogenic opal flux is the most dominant (42% of the total flux). A positive relationship (except January) between biogenic opal and total organic carbon fluxes suggests that these two variables were coupled, due to the surface-water production (mainly diatoms). The relatively low δ13C values of settling particles result from effects on C-fixation processes at low temperature and the high CO2 availability to phytoplankton. The correspondingly low δ15N values are due to intense and steady input of nitrates into surface waters, reflecting an unlikely nitrate isotope fractionation by degree of surface-water production. The δ15N and δ13C values of sinking particles increased from the beginning to the end of a presumed phytoplankton bloom, except for anomalous δ15N values. Krill and the zooplankton fecal pellets, the most important carriers of sinking particles, may have contributed gradually to the increasing δ13C values towards the unproductive period through the biomodification of the δ13C values in the food web, respiring preferentially and selectively 12C atoms. Correspondingly, the increasing δ15N values in the intermediate-water trap are likely associated with a switch in source from diatom aggregates to some remains of zooplankton, because organic matter dominated by diatom may be more liable and prone to remineralization, leading to greater isotopic alteration. In particular, the tendency for abnormally high δ15N values in February seems to be enigmatic. A specific species dominancy during the production may be suggested Sat, 01 Jan 2005 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6679 2005-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/7565 Title: Diversity of Arctic & Antarctic Marine Bacteria Authors: Sung, Ki Cheol; Yim, Joung Han; Cho, Kyeung Hee; Lee, Yoo Kyung; Lee, Hong Kum; Cho, Hyun Hee Abstract: The Arctic & Antarctic are representative cold habitats that offer good sources of useful enzymes with activity at low temperature. Various marine bacterial strains were isolated from marine environment around the Korean Arctic Research Station Dasan located at Ny-Alesund, Svalbard, Norway (79°N, 12°E), and the King Sejong Station in Antarctica (62°S, 58°W). The collected samples were diluted in distilled seawater, and spread on marine agar plates. They cultured at 10℃, and bacterial isolates were preserved in glycerol media (15%, v/v) at – 80℃. Phylogenetic analysis of 16S rDNA sequences indicated that the marine bacteria belonged to alpha-, beta-, and gamma-Proteobacteria, the CFB group, and High GC Gram-positive bacteria. They were Aequorivita, Ahrensia, Algoriphagus, Carnobacterium, Cellulophaga, Cobetia, Colwellia, Exiguobacterium, Flavobacterium, Glaciecola, Hydrogenophaga, Hyphomicrobium, Leifsonia, Loktanella, Marinobacter, Marinomonas, Paracoccus, Pibocella, Plantibacter, Planococcus, Polaribacter, Pseudoaltermonas, Pseudomonas, Psychrobacter, Psychroserpens, Roseobacter, Shewanella, Sulfitobacter, Vibrio and Zobellia species. Among the bacteria, we found several candidates for new species or genus. We also screened chitinase-, lipase-, or protease-producing bacteria. Most of them belonged to genus Pseudoalteromonas. We expect that these Arctic & Antarctic bacteria can be used to develop new industrial enzymes. Sat, 01 Jan 2005 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/7565 2005-01-01T00:00:00Z