Northwest Iceland Holocene Biomarker Data and Climate Reconstructions Moossen, H.; Bendle, J.A.; Seki, O.; Quillmann, U.; Kawamura, K. Moossen, H. Bendle, J.A. Seki, O. Quillmann, U. Kawamura, K. Air Temperature Reconstruction Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (average chain length,n-alkane,null,dimensionless,null,paleoceanography,null,null,N,average chain length of leaf wax-derived n-alkanes (ACL25-35); 0.06 1S SD; ACL25-35 values were calculated after Schefuss et al. (2003)) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 2H,C29 n-alkane,one standard deviation,per mil VSMOW,null,paleoceanography,corrected,null,N,leaf wax-derived C29 n-alkane; 4.7 1S SD; C29-dD values were corrected for changes in global ice volume after Collins et al. (2003)) earth science/paleoclimate/climate reconstructions|paleoceanography (surface air temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,CBT/MBT' values were converted to SSTs using the calibration equation published by Peterse et al. (2012)) earth science/paleoclimate/climate reconstructions|paleoceanography (pH,glycerol dialkyl glycerol tetraether index|soil,null,dimensionless,null,climate reconstructions|paleoceanography,null,null,N,CBT values were converted to soil pH using the calibration equation published by Peterse et al. (2012)) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,UK'37 values were converted to SSTs using the calibration equation published by Conte et al. (2006)) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (MD99-2266>LATITUDE 66.228>LONGITUDE -23.265) Holocene climatic change is driven by a plethora of forcing mechanisms acting on different time scales, including: insolation, internal ocean (e.g. Atlantic Meridional Overturning Circulation; AMOC) and atmospheric (e.g. North Atlantic Oscillation; NAO) variability. However, it is unclear how these driving mechanisms interact with each other. Here we present five, biomarker based, paleoclimate records (air-, sea surface temperature and precipitation), from a fjordic sediment core, revealing North Atlantic terrestrial and marine climate in unprecedented detail. The Early Holocene (10.7-7.8 kyrs BP) is characterised by relatively high air temperatures while SSTs are dampened by melt water events, and relatively low precipitation. The Middle Holocene (7.8-3.2 kyrs BP) is characterised by peak SSTs, declining air temperatures and high precipitation. A pronounced marine thermal maximum occurs between ~7-5.5 kyrs BP, 3000 years after the terrestrial thermal maximum, driven by melt water cessation and an accelerating AMOC. The neoglacial cooling, between 5.8 and 3.2 kyrs BP leads into the late Holocene. We demonstrate that an observed modern link between Icelandic precipitation variability during different NAO phases, may have existed from ~7.5 kyrs BP. A simultaneous decoupling of both air, and sea surface temperature records from declining insolation at ~3.2 kyrs BP may indicate a threshold, after which internal feedback mechanisms, namely the NAO evolved to be the primary drivers of Icelandic climate on centennial time-scales. STUDY NOTES: Northwest Iceland Holocene sea surface temperature and mean air temperature reconstructed using soil-pH, ACL25-35 variability, and the hydrogen isotopic composition of the C29 n-alkane from sediment core MD99-2266, Isafjardardjup Fjord, Denmark Strait NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Moossen, H. Investigator : Bendle, J.A. Investigator : Seki, O. Investigator : Quillmann, U. Investigator : Kawamura, K. 2016-04-15 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20023 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015ph.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015sst.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015acl.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015mat.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015dd.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015ph.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015sst.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015acl.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015mat.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015dd.txt English https://www.ncdc.noaa.gov/paleo/study/20023 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015ph.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015sst.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015acl.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015mat.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015dd.txt Heiko Moossen, James Bendle, Osamu Seki, Ursula Quillmann, Kimitaka Kawamura2015North Atlantic Holocene climate evolution recorded by high-resolution terrestrial and marine biomarker recordsQuaternary Science Reviews129111-12710.1016/j.quascirev.2015.10.013http://www.sciencedirect.com/science/article/pii/S0277379115301372 START YEAR: 10744 cal yr BP * END YEAR: 310 cal yr BP -23.265 66.228 -23.265 66.228