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하계 마리안 소만 빙하후퇴에 따른 식물플랑크톤 변동성 분석
심초롬,민준오,이보연,홍서연,하선용 해양환경안전학회 2023 해양환경안전학회지 Vol.29 No.5
Rapid climate change has resulted in glacial retreat and increased meltwater inputs in the Antarctic Peninsula, including King George Island where Marian Cove is located. Consequently, these phenomena are expected to induce changes in the water column light properties, which in turn will affect phytoplankton communities. To comprehend the effects of glacial retreat on the marine ecosystem in Marian Cove, we investigated on phytoplankton biomass (chlorophyll-a, chl-a) and various environment parameters in this area in December 2021 and January 2022. The average temperature at the euphotic depth in January 2022 (1.41 ± 0.13 ℃) was higher than that in December 2021 (0.87 ± 0.17 ℃). Contrastingly, the average salinity was lower in January 2022 (33.9 ± 0.10 psu) than in December 2021 (34.1 ± 0.12 psu). Major nutrients, including dissolved inorganic nitrogen, phosphate, and silicate, were sufficiently high, and thus, did not act as limiting factors for phytoplankton biomass. In December 2021 and January 2022, the mean chl-a concentrations were 1.03 ± 0.64 and 0.66 ± 0.15μg L-1, respectively. The mean concentration of suspended particulate matter (SPM) was 24.9 ± 3.54 mg L-1 during the study period, with elevated values observed in the vicinity of the inner glacier. However, relative lower chl-a concentrations were observed near the inner glacier, possibly due to high SPM load from the glacier, resulting in reduced light attenuation by SPM shading. Furthermore, the proportion of nanophytoplankton exceeded 70% in the inner cove, contributing to elevated mean fractions of nanophytoplankton in the glacier retreat marine ecosystem. Overall, our study indicated that freshwater and SPM inputs from glacial meltwater may possibly act as main factors controlling the dynamics of phytoplankton communities in glacier retreat areas. The findings may also serve as fundamental data for better understanding the carbon cycle in Marian Cove.
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하계 남극 킹조지섬 마리안소만에서의 유색용존유기물(CDOM) 분포
이보연,민준오,김보경,심초롬,하선용 한국해양환경·에너지학회 2023 한국해양환경·에너지학회지 Vol.26 No.3
Rapid climate change is progressing in the Antarctic coastal area and has various influences on the envi-ronmental conditions. The spatiotemporal distribution and the source of colored dissolved organic matter (CDOM) were investigated in Marian Cove, King George Island, Antarctica, during the summer season in 2019 and 2020. The temperature in 2019 and 2020 were 0.42~1.44, -0.02~2.48 ℃, respectively, while sa-linity was 34.1±0.16 psu in 2019 and 33.9±0.41 psu in 2020. Phytoplankton biomass (chlorophyll-a, Chl-a) in 2020 was 1.49±1.22 μg L-1 which was two times higher than in 2019 (0.65±0.61 μg L-1). The ab-sorption coefficient at 355 nm (aCDOM(355)) showed a wide range of 0.17~10.59 m-1 in 2019, and a sig-nificantly lower value of 0.04~0.50 m-1 in 2020. CDOM was positively correlated with salinity (rs=0.55, p<0.05) and the whole water column was vertically and horizontally well-mixed, suggesting that CDOM in Marian Cove mostly originated from the organic matter in the influent from Maxwell Bay. There may be a resuspension of sediments accompanied by tidal current or wind in the cove, which probably contribut-ed to the increase in CDOM at the bottom. These results imply that organic matter changes in Marian Cove, which exhibits narrow and shallow topography, are mainly driven by physical factors. Long-term monitoring of CDOM may provide fundamental data for understanding climate-related organic matter cycles.
ScienceON
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