Hydrogen isotope ratios (2H/1H or δ2H) were measured in lipid biomarkers from algal, plant and microbial sources sediment cores a lake peat bog on the small, sparsely-inhabited Washington Island (4°43′N, 160°25′W) to assess central equatorial Pacific hydroclimate conditions during last millennium. High δ2H values lipids variety of biological indicate that driest period millennium occurred ∼1450...