# Northwest Iceland Holocene Biomarker Data and Climate Reconstructions #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/20023 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/moossen2015/moossen2015acl.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography # # Parameter_Keywords: ACL25-35; soil-pH; C29-dD, Iceland, Holocene #--------------------------------------- # Contribution_Date # Date: 2016-04-15 #--------------------------------------- # Title # Study_Name: Northwest Iceland Holocene Biomarker Data and Climate Reconstructions #--------------------------------------- # Investigators # Investigators: Moossen, H; Bendle, J; Seki, O; Quillmann, U; Kawamura, K #--------------------------------------- # Description and Notes # Description: 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. #--------------------------------------- # Publication # Authors: Heiko Moossen, James Bendle, Osamu Seki, Ursula Quillmann, Kimitaka Kawamura # Published_Date_or_Year: 2015-12-01 # Published_Title: North Atlantic Holocene climate evolution recorded by high-resolution terrestrial and marine biomarker records # Journal_Name: Quaternary Science Reviews # Volume: 129 # Edition: # Issue: # Pages: 111-127 # Report Number: # DOI: 10.1016/j.quascirev.2015.10.013 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0277379115301372 # Full_Citation: # Abstract: 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. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Scottish Alliance for Geoscience, Environment and Society # Grant: #--------------------------------------- # Site Information # Site_Name: MD99-2266 # Location: Ocean>Atlantic Ocean>North Atlantic Ocean # Country: # Northernmost_Latitude: 66.2295 # Southernmost_Latitude: 66.2295 # Easternmost_Longitude: -23.2655 # Westernmost_Longitude: -23.2655 # Elevation: -106 m #--------------------------------------- # Data_Collection # Collection_Name: Moossen2015ACL # First_Year: 10744 # Last_Year: 321 # Time_Unit: cal yr BP # Core_Length: 38.90 # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## age_calBP age, , , calendar years before present, , , , ,N ## ACL25-35 Average chain length, leaf wax derived n-alkanes (ACL25-35), 0.06 1S SD,,,Paleoceanography,, ACL25-35 values were calculated after Schefuss et al. (2003) ,N # #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # Age ACL25-35 321 29.42 331 28.72 350 29.18 360 29.15 369 29.26 379 29.26 388 29.16 398 29.25 408 29.32 417 29.27 443 29.68 467 29.27 491 29.25 515 29.2 539 29.21 563 29.17 587 29.23 611 29.28 635 29.18 659 29.16 683 29.04 707 29.19 731 29.19 752 29.18 775 29.16 797 29.1 819 29.26 841 29.14 864 29.27 886 29.15 930 29.34 952 29.31 975 29.35 997 29.45 1015 29.26 1029 29.03 1044 29.15 1059 29.47 1074 29.73 1089 29.21 1105 29.06 1120 29.19 1135 29.36 1150 29.36 1165 29.06 1182 29.56 1208 29.24 1283 29.1 1307 29.01 1332 28.96 1359 28.95 1413 29.04 1439 29.12 1465 29.1 1490 29.1 1516 28.94 1542 29.12 1568 28.88 1594 28.91 1619 28.97 1645 28.98 1671 29.01 1697 28.96 1722 28.95 1746 28.9 1771 29.03 1796 29.06 1821 28.98 1846 29.03 1871 28.99 1921 29 1946 28.93 1970 28.94 1995 28.96 2020 29 2045 28.9 2070 28.92 2095 28.77 2120 29.03 2145 28.87 2168 28.98 2212 28.98 2263 28.86 2313 29.06 2363 29.05 2413 29.45 2463 29.05 2513 29.4 2664 29.3 2714 29.5 2814 29.05 2864 29.68 2915 29.11 2965 29.09 3015 28.99 3065 29.22 3115 29.07 3165 28.99 3215 28.95 3266 29.03 3301 29 3330 29 3364 28.75 3398 29 3432 29.02 3467 29.09 3501 28.96 3535 29 3683 28.98 3717 28.83 3751 29.06 3785 29.01 3820 28.99 3854 28.99 3888 28.78 3922 28.99 3956 28.95 3991 28.61 4025 28.99 4059 28.94 4093 29 4128 28.87 4162 28.98 4196 28.81 4230 28.86 4264 28.88 4299 28.83 4333 28.75 4367 28.87 4401 28.73 4436 28.78 4470 28.85 4504 28.88 4538 28.92 4572 28.93 4607 28.93 4641 28.99 4675 28.98 4709 28.91 4744 28.84 4816 28.93 4898 29.01 4980 28.88 5062 28.85 5144 28.87 5226 28.94 5309 28.87 5391 28.86 5473 28.92 5555 28.9 5637 28.86 5719 28.89 5801 28.89 5883 28.91 5965 28.96 6047 28.75 6129 28.91 6211 28.88 6293 28.92 6375 28.88 6457 28.93 6555 28.89 6605 28.87 6655 28.88 6756 28.9 6806 28.77 6856 28.83 6906 28.77 6956 28.89 7006 28.92 7056 28.9 7107 28.93 7158 28.94 7208 28.91 7258 28.91 7299 28.95 7320 28.95 7336 28.97 7367 28.8 7382 28.64 7397 28.89 7442 29.04 7457 29.03 7473 29.02 7488 29.06 7503 28.93 7518 29.02 7533 28.99 7548 29.04 7563 29.02 7578 28.96 7594 29.43 7609 29.23 7624 29.1 7639 29.37 7654 29.44 7669 28.9 7684 28.97 7700 29.04 7715 29.1 7730 29.05 7745 29.02 7760 29.18 7775 29.33 7790 29.3 7805 29.29 7821 29.29 7836 29.41 7851 29.33 7866 29.19 7881 29.33 7896 29.32 7911 29.3 7927 29.4 7942 29.22 7957 29.32 7972 29.36 7987 29.31 8002 29.35 8017 29.35 8032 29.33 8048 29.3 8063 29.33 8078 29.32 8093 29.26 8108 29.37 8123 29.24 8138 29.25 8153 29.21 8168 29.21 8183 29.19 8198 29.32 8213 29.21 8232 29.22 8248 29.26 8263 29.28 8278 29.24 8295 29.35 8310 29.23 8325 29.17 8340 29.19 8355 29.19 8370 29.27 8386 28.98 8401 28.98 8416 29.16 8431 29.27 8446 29.14 8461 29.27 8476 29.31 8491 29.09 8506 29.3 8522 29.24 8537 29.12 8552 29.16 8568 29.2 8583 29.17 8598 29.28 8614 29.2 8629 29.25 8644 29.23 8659 29.22 8674 29.23 8689 29.23 8704 29.26 8719 29.3 8734 29.22 8749 29.06 8765 29.23 8780 28.76 8795 29.21 8810 29.24 8842 29.22 8893 29.18 8943 29.19 8994 29.29 9045 29.33 9095 29.33 9146 29.34 9196 29.17 9247 29.29 9297 29.33 9348 29.41 9399 29.44 9449 29.42 9508 29.39 9550 29.37 9600 29.44 9653 29.54 9702 29.5 9748 29.46 9797 29.49 9847 29.56 9897 29.45 9947 29.31 9996 29.45 10046 29.46 10143 29.32 10182 29.32 10253 29.18 10302 29.29 10351 29.26 10400 29.39 10449 29.22 10498 29.24 10548 29.16 10597 29.25 10646 29.24 10695 29.28 10744 29.09