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Holocene subsurface temperature variability in the eastern Antarctic continental margin
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Holocene subsurface temperature variability in the eastern Antarctic continental margin
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Journal Article
Holocene subsurface temperature variability in the eastern Antarctic continental margin
2012
Overview
We reconstructed subsurface (∼45–200 m water depth) temperature variability in the eastern Antarctic continental margin during the late Holocene, using an archaeal lipid‐based temperature proxy (TEX86L). Our results reveal that subsurface temperature changes were probably positively coupled to the variability of warmer, nutrient‐rich Modified Circumpolar Deep Water (MCDW, deep water of the Antarctic circumpolar current) intrusion onto the continental shelf. The TEX86Lrecord, in combination with previously published climatic records, indicates that this coupling was probably related to the thermohaline circulation, seasonal variability in sea ice extent, sea temperature, and wind associated with high frequency climate dynamics at low‐latitudes such as internal El Niño Southern Oscillation (ENSO). This in turn suggests a linkage between centennial ENSO‐like variability at low‐latitudes and intrusion variability of MCDW into the eastern Antarctic continental shelf, which might have further impact on ice sheet evolution. Key Points Applying a newly developed archaeal membrane lipid‐based paleothermometer High subsurface temperature variability during the late Holocene Variability of Modified Circumpolar Deep Water intrusion into the continental shelf
