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Holocene paleoenvironmental history in the western South Orkney Islands was reconstructed through the paleoecological analysis on the diatom taxa from sediment core GC02-SOI03. Three diatom zones are identified on the basis of frequency of the critical taxa throughout the section: diatom assemblage ...

Holocene paleoenvironmental history in the western South Orkney Islands was reconstructed through the paleoecological analysis on the diatom taxa from sediment core GC02-SOI03. Three diatom zones are identified on the basis of frequency of the critical taxa throughout the section: diatom assemblage zone Ⅰ (533 ㎝∼360 ㎝), diatom assemblage zone Ⅱ (352 ㎝∼240 ㎝), and diatom assemblage zone Ⅲ (232 ㎝∼0 ㎝). High concentration of open water species and Eucampia antarctica var. antarctica in the diatom assemblage zone I indicates open water environment with little sea-ice during the early Holocene. Sea-ice species and Eucampia antarctica var. recta increase in abundance in the diatom assemblage zone Ⅱ, suggesting increased sea-ice cover in the study area since 5 ka. Even more extensive sea-ice coverage during the late Holocene is implied by abundant sea-ice species and decreased Corethron criophilum in the diatom assemblage zone Ⅲ.

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