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IEG 환경지질연구정보센터

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- 229 - PS2-289

Turbid plume dynamics at Marian Cove of the South Shetland Islands during austral summer, West Antarctica

Kyu-Cheul Yoo

1

*․Ho Il Yoon

2

․Cheon Yoon Kang

2

․Yong Il Lee

1

1

School of Earth and Environmental Sciences, Seoul National University,

2

Korea Polar Research Institute, Korea Ocean Research and Development Institute

1

School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Republic of Korea

016-270-2998 [email protected]

요 약

During austral summer vertical CTDT (conductivity/temperature/depth/transmissivity) measurements near tidewater glacier of Marian Cove were conducted to describe the short-term variations of water column characteristics from 1996 to 2000 and to elucidate sedimentation of fjord environment in Antarctica by hydrographic forcings.

Four distinct layers were recognized at ice-proximal zone of the cove,: 1) a surface

plume composed of cold and turbid meltwater, 2) warmer Maxwell Bay inflow with

characteristics of outer fjord water, 3) mid-depth turbid/cold plume (40 to 70 m

water depth) originated from subglacial discharge, and 4) a fjord deep water

comprised of remnant winter water. The main factor influencing the behavior of

plumes and the water column structures and deriving the deposition of suspended

particles is tidal forcing coupling with wind. A small amount of meltwater streams

with clean icebergs yield low accumulation rate of non-biogenic sedimentary particles

over the whole cove, although ice-contact processes are active under the influence

of warmer Maxwell Bay inflow and ice terminus rapidly retreat. In particular, westerly

wind-induced turbulence coupling with high tide may promote the downward

transportation of suspended particles in turbid plumes to the sea bottom at the

ice-proximal zone of the cove.

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