Climate of the Past www.clim-past.net 1814-9324 1814-9332 6 2 2010 10.5194/cp-6-179-2010 http://www.clim-past.net/6/179/2010/ http://www.clim-past.net/6/179/2010/cp-6-179-2010.html http://www.clim-past.net/6/179/2010/cp-6-179-2010.pdf 179 193 2010-03-30 Holocene trends in the foraminifer record from the Norwegian Sea and the North Atlantic Ocean C. Andersson carin.andersson@uni.no F. S. R. Pausata E. Jansen B. Risebrobakken R. J. Telford UNI Bjerknes Centre, Bergen, Norway Department of Earth Science, University of Bergen, Bergen, Norway Geophysical Institute, University of Bergen, Bergen, Norway Bjerknes Centre for Climate Research, Bergen, Norway Department of Biology, University of Bergen, Bergen, Norway The early to mid-Holocene thermal optimum is a well-known feature in a wide variety of paleoclimate archives from the Northern Hemisphere. Reconstructed summer temperature anomalies from across northern Europe show a clear maximum around 6000 years before present (6 ka). For the marine realm, Holocene trends in sea-surface temperature reconstructions for the North Atlantic and Norwegian Sea do not exhibit a consistent pattern of early to mid-Holocene warmth. Sea-surface temperature records based on alkenones and diatoms generally show the existence of a warm early to mid-Holocene optimum. In contrast, several foraminifer and radiolarian based temperature records from the North Atlantic and Norwegian Sea show a cool mid-Holocene anomaly and a trend towards warmer temperatures in the late Holocene. In this paper, we revisit the foraminifer record from the Vøring Plateau in the Norwegian Sea. We also compare this record with published foraminifer based temperature reconstructions from the North Atlantic and with modelled (CCSM3) upper ocean temperatures. Model results indicate that while the seasonal summer warming of the sea-surface was stronger during the mid-Holocene, sub-surface depths experienced a cooling. 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