A 350-year multiproxy record of climate-driven environmental shifts in the Amundsen Sea Polynya, Antarctica SCIE SCOPUS

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A 350-year multiproxy record of climate-driven environmental shifts in the Amundsen Sea Polynya, Antarctica
Kim, So-Young; Lim, Dhongil; Rebolledo, Lorena; Park, Taewook; Esper, Oliver; Muñoz, Práxedes; La, Hyoung Sul; Kim, Tae Wan; Lee, SangHoon
KIOST Author(s)
Lim, Dhong Il(임동일)
Alternative Author(s)
Publication Year
With a growing concern over rapid Antarctic ice loss in recent years, the Amundsen Sea, one of the fastest-melting areas in Antarctica, currently becomes a hotspot for the Earth sciences in the context of its linkage to global climate. As a center of strong physical and biological coupling processes, polynyas of the Amundsen Sea could act as sentinels of changes in atmosphere–ice–ocean interactions, offering a unique perspective into its sensitivity to climate variability. Here, we present a new, multiproxy-based high-resolution sedimentary record from the Amundsen Sea polynya, which provides new insights into environmental conditions of the region over the last 350 years and their linkages to climatic factors. Our results show that the polynya witnessed step-wise environmental shifts in parallel with the phases and strength of large-scale climate patterns, i.e., the Southern Annular Mode (SAM) and El Niño–Southern Oscillation (ENSO). Notably, intersite correlation of on-shelf Circumpolar Deep Water (CDW) intrusion signals at different locals suggests that the CDW may have gained increased access to the shelves at the time of a strong coupling of positive SAM and El Niño states. We tentatively speculate that anomalous large-scale atmospheric and oceanic circulation patterns over the Southern Hemisphere, forced by increasing greenhouse gas levels, were strongly involved in the mid-20th century CDW invigoration, which may be greater in scale that goes well beyond the Amundsen Sea region. This result is relevant to the current debate on spatial heterogeneity in the timing and phasing of major climatic events in Antarctica, underscoring an unambiguous connection of the Antarctic climate state to the large-scale ocean–atmosphere reorganizations. Our study also extends a growing evidence that today's global warming trend is expected to have a severe effect on future configuration of Antarctic continental ice-shelf environment.
Bibliographic Citation
Global and Planetary Change, v.205, 2021
Elsevier BV
Atmospheric pressure; Charge density waves; Global warming; Greenhouse gases; Sea ice; Biological couplings; Environmental conditions; Greenhouse gas levels; Intersite correlation; Oceanic circulation patterns; Southern Annular Mode; Southern oscillation; Spatial heterogeneity; Earth (planet)
Amundsen Sea Polynya; Sediment; Circumpolar Deep Water; Atmospheric circulation
Elsevier BV
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Research Interests

Marine Geochemistry,Paleoceanography,Marine Pollution,해양지화학,고해양학,해양오염학

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