Publication Date:
2018-05-17
Description:
Publication date: Available online 2 May 2018 Source: Polar Science Author(s): Pawan Govil, Abhijit Mazumder, Raghu Ram, Dhruv Sen Singh, Syed Azharuddin The present study deals with the role of sedimentary processes in the lake of Schirmacher Oasis (SO), East Antarctica and their periodicities to understand the forcing mechanism responsible for the regional climate variations. We analyzed various sedimentary parameters viz. sand, silt, clay, roundness andbiogenic silica (BSI) from lake L-51. The proxy record reports the occurrence of increased freshwater runoff around 14.7–12.2 ka,.in the lake followed by Holocene climate optimum around 11.2–10 ka and 9.4–8.4 ka. The SO records the ice sheet retreat during mentioned periods. . The spectral analysis of the sedimentological parameters reveals the significant periodicities (>95% significance) centering at ∼1067, ∼907, and ∼824 years. The long-term trends in the data suggest the possible fluctuation of Antarctic ice-sheet superimposed on global climatic fluctuations due to solar activity.
Print ISSN:
1873-9652
Topics:
Geosciences
