Holocene sea-ice conditions and circulation at the Chukchi-Alaskan margin, Arctic Ocean, inferred from biomarker proxies

Two sediment cores from the Chukchi Sea margin were investigated for the Arctic sea-ice biomarker IP 25 , along with marine and terrestrial sterols and glycerol dialkyl glycerol tetraethers (GDGTs). This is the first paleoclimatic application of IP 25 in the Chukchi-Alaskan region of the Arctic, which is key for understanding Arctic–Pacific interactions and is experiencing rapid sea-ice retreat under present warming. Sea-ice and related...