The effect of global climate change on the release of terrestrial organic carbon in the Arctic Region
作者： Ayca Dogrul Selver
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摘要: The Arctic Region is currently experiencing an amplified warming if compared to the rest of world. soils in this region store approximately half global soil organic carbon (OC), mainly locked permanently-frozen ground (permafrost). This sink sensitive meaning that predicted will likely increase thaw-release ?old? carbon. However, what happens remobilized OC once it transported Ocean, including potential conversion greenhouse gasses causing a positive feedback climate warming, remains unclear. In work, we further investigate fate terrestrial derived (terrOC) Eurasian Region. key findings work are: ? Glycerol dialkyl glycerol tetraethers (GDGTs) and bacteriohopanepolyols (BHPs) are present marine sediments associated Branched Isoprenoidal tetraether (BIT) Rsoil indices can be used trace terrOC realm. slight modification index suggested (R?soil). Analyses indicate behaviour BIT largely controlled by GDGT contribution while R?soil removal marker BHPs. Although both suggest non-conservative behavior for terrOC, leads differences estimations percentage present. A multi-proxy approach essential since use single-proxy lead over/under estimation.? Comparison ?13Csoc across East Siberian Shelf indicates possibly reflecting predominantly fluvial input represents mixed coastal erosion input.? macromolecular composition varies along west-east climosequence river runoff surface wetland coverage (sphagnum vs. higher plants) but not affected presence/absence continuous permafrost. phenols/(phenols+pyridines) ratio was as proxy at level Kolyma River-East Sea transect. results comparable bulk terrOC.All molecular analyses/based proxies showed behaves non-conservatively potentially change.
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