Transformations of landscape and peat‐forming ecosystems in response to late Holocene climate change in the western Antarctic Peninsula. Issue 13 (14th July 2016)

• Record Type: Journal Article
• Authors: Yu, Zicheng; Beilman, David W.; Loisel, Julie
• Is Part Of: Geophysical research letters. Volume 43:Issue 13(2016)
• Page Start: 7186
• Page End: 7195
• Publication Date: 2016-07-14
• Subjects: climate -- Deschampsia -- paleoclimate -- paleoecology -- peat; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2016GL069380
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: We used subfossil mosses and peats to document changes in regional climate, cryosphere, and terrestrial ecosystems in the western Antarctic Peninsula at ~65°S latitude. We find that most peat forming ecosystems have initiated since 2800 cal B.P., in response to warmer summers and increasing summer insolation. The period at 900–600 cal B.P. was coldest as indicated by ice advance, abundance of kill ages from ice‐entombed mosses exposed recently from retreating glacial ice, and apparent gap in peatbank initiation. Furthermore, the discovery of a novel Antarctic hairgrass ( Deschampsia antarctica ) peatland at 2300–1200 cal B.P. from the mainland Antarctic Peninsula suggests a much warmer climate than the present. A warming and wetting climate in the 1980s caused very high carbon accumulation in a Polytrichum strictum moss peatbank. Our results document dramatic transformations of landscape and ecosystems in response to past warmer climate, providing a telltale sign for what may come in the future. Key Points: The discovery of a novel Antarctic hairgrass ( Deschampsia ) peatland at 2300‐1200 cal yr B.P. suggests a warmer climate than today Ages of reexposed ice‐entombed mosses show ice advance at 900‐600 cal yr B.P. in the western Antarctic Peninsula Rapid carbon accumulation in a moss peatbank responded to warming and wetting climate in the 1980s