남극 남쉐틀랜드 북부 대륙주변부 및 남스코시아해 지역의 고해상(3.5 kHz)음향 특성 SCOPUS KCI

Title
남극 남쉐틀랜드 북부 대륙주변부 및 남스코시아해 지역의 고해상(3.5 kHz)음향 특성
Alternative Title
High-Resolution (3.5 kHz) Echo Characters of the Northern South Shetland Continental Margin and the South Scotia Sea, Antarctica
Author(s)
이상훈; 진영근; 김규중; 남상헌; 김예동
Alternative Author(s)
이상훈; 진영근; 김규중; 남상헌; 김예동
Publication Year
2003-12
Abstract
High-resolution (3.5 kHz) subbottom profiles were analyzed in order to reveal sedimentation pattern of late Quaternary in the northern South Shetland continental margin and the South Scotia Sea, Antarctica. On the basis of clarity, continuity and geometry of surface and subbottom echoes together with seafloor topography, high-resolution echo characters are classified into eight echo types which represent rock basements (echo type III-1), coarse-grained subglacial till or moraine (echo type I-1), slides/slumps (echo type IV), debris-flow deposits (echo types II-3 and III-2), and bottom-current deposits (echo types I-2, II-1 and II-2). Subglacial till or moraine (echo type I-1) is mostly present in the lower continental shelf and upper continental slope of the northern South Shetland continental margin, which changes downslope to slides/slumps (echo type IV) and debris-flow deposits (echo types II-3 and III-2) in the middle to lower continental slope. This distribution suggests that the continental slopes of the northern South Shetland continental margin were mostly affected by downslope gravitational processes. Further downslope, bottom-current sediments (echo type I-2) deposited by the southwestward flowing Antarctic Deep Water (ADW) occur at the South Shetland Trench, reflecting an Interaction between mass flows and bottom currents in the area. In contrast to the northern South Shetland continental margin, the South Scotia Sea is dominated by bottom-current deposits (echo types II-1 and II-2), indicating that the sedimentation was mostly controlled by the westward flowing ADW. Flow intensity of the ADW has increased in the relative topographic highs, forming thin covers of coarse-grained contourites (echo type II-1), whereas it has decreased in the relative topographic lows, depositing thick, fine-grained contourites (echo type II-2). The poor development of wave geometry in the fine-grained bottom-current deposits (echo type II-2) is suggestive of the unsteady nature of the ADW flow.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5405
Bibliographic Citation
Ocean and Polar Research, v.25, no.4, pp.557 - 567, 2003
Publisher
한국해양과학기술원
Keywords
northern South Shetland continental margin; South Scotia Sea; mass-flow and bottom-current deposits; 고해상 음향 특성; 제4기 후기 퇴적작용; 질량류 및 저층류 퇴적물; 남쉐틀랜드 북부 대륙주변부; 남스코시아해; high-resolution acoustic characters; late Quaternary sedimentation
Type
Article
Publisher
한국해양과학기술원
Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse