noaa-ocean-20023 Northwest Iceland Holocene Biomarker Data and Climate Reconstructions Moossen, H.; Bendle, J.A.; Seki, O.; Quillmann, U.; Kawamura, K. Northwest Iceland Holocene Biomarker Data and Climate Reconstructions 2016-04-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20023 Investigator H. Moossen Investigator J.A. Bendle Investigator O. Seki Investigator U. Quillmann Investigator K. Kawamura 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 biomarkers earth science paleoclimate paleocean reconstruction geoscientificInformation Air Temperature Reconstruction Sea Surface Temperature Reconstruction 10744 cal yr BP 310 cal yr BP Complete 66.228 66.228 -23.265 -23.265 -106 -106 Ocean Atlantic Ocean North Atlantic Ocean MD99-2266>LATITUDE 66.228>LONGITUDE -23.265 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Heiko Moossen, James Bendle, Osamu Seki, Ursula Quillmann, Kimitaka Kawamura 2015 Quaternary Science Reviews 129 111-127 10.1016/j.quascirev.2015.10.013 http://www.sciencedirect.com/science/article/pii/S0277379115301372

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

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015ph.txt Data File; Soil pH from CBT GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015sst.txt Data File; Sea Surface Temperature reconstruction from Uk'37 GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015acl.txt Data File; Average Chain Length Leaf Wax-derived n-alkanes (ACL25-35) GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015mat.txt Data File; Temperature Reconstruction (CBT/MBT') GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015dd.txt Data File; delta Deuterium of leaf wax derived C29 n-alkane USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11