# West Greenland Holocene Lake Sediment Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), # and date accessed when using these downloaded data. If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/13664 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-lake-13664.json # Study_Level_JSON_Description: JSON metadata of this file's parent study, which includes all study metadata. # # Data_Type: Paleolimnology # # Dataset_DOI: 10.25921/86my-zm12 # # Science_Keywords: #-------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/paleolimnology/greenland/north2013loi.txt # Data_Download_Description: NOAA Template File; Loss-on-Ignition Data # # Original_Source_URL: # Original_Source_Description: # #-------------------- # Contribution_Date # Date: 2012-12-13 #-------------------- # File_Last_Modified_Date # Date: 2022-10-07 #-------------------- # Title # Study_Name: West Greenland Holocene Lake Sediment Data #-------------------- # Investigators # Investigators: Axford, Y.(https://orcid.org/0000-0002-8033-358X); Losee, S.; Briner, J.P.; Francis, D.R.; Langdon, P.G.(https://orcid.org/0000-0003-2724-2643); Walker, I.R. #-------------------- # Description_Notes_and_Keywords # Description: Lake sediment proxy data from 5 Holocene lakes in West Greenland, located between Disko Bugt and the Greenland Ice Sheet near the coastal town of Ilulissat. Proxy data include Magnetic Susceptibility (MS), Loss-on-Ignition (LOI), Biogenic Silica, and chironomid assemblages. #-------------------- # Publication # Authors: Yarrow Axford, Shanna Losee, Jason P. Briner, Donna R. Francis, Peter G. Langdon, and Ian R. Walker # Journal_Name: Quaternary Science Reviews # Published_Title: Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments # Published_Date_or_Year: 2013 # Volume: 59 # Pages: 87-100 # Issue: # Report_Number: # DOI: 10.1016/j.quascirev.2012.10.024 # Full_Citation: # Abstract: Predicting the response of the Greenland Ice Sheet to future climate change presents a major challenge to climate science. Paleoclimate data from Greenland can provide empirical constraints on past cryospheric responses to climate change, complementing insights from contemporary observations and from modeling. Here we examine sedimentary records from five lakes near Jakobshavn Isbrae in central West Greenland to investigate the timing and magnitude of major Holocene climate changes, for comparison with glacial geologic reconstructions from the region. A primary objective of this study is to constrain the timing and magnitude of maximum warmth during the early to middle Holocene positive anomaly in summer insolation. Temperature reconstructions from subfossil insect (chironomid) assemblages suggest that summer temperatures were warmer than present by at least 7.1 ka (the beginning of the North Lake record; ka = thousands of years before present), and that the warmest millennia of the Holocene occurred in the study area between 6 and 4 ka. Previous studies in the Jakobshavn region have found that the local Greenland Ice Sheet margin was most retracted behind its present position between 6 and 5 ka, and here we use chironomids to estimate that local summer temperatures were 2-3°C warmer than present during that time of minimum ice sheet extent. As summer insolation declined through the late Holocene, summer temperatures cooled and the local ice sheet margin expanded. Gradual, insolation-driven millennial-scale temperature trends in the study area were punctuated by several abrupt climate changes, including a major transient event recorded in all five lakes between 4.3 and 3.2 ka, which overlaps in timing with abrupt climate changes previously documented around the North Atlantic region and farther afield at ~4.2 ka. #-------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant_Number: ARC-0909347, ARC-0909334, BCS-0752848 #-------------------- # Funding_Agency # Funding_Agency_Name: Northwestern University # Grant_Number: Initiative for Sustainability and Energy (ISEN) #-------------------- # Site_Information # Site_Name: North Lake # Location: Greenland # Northernmost_Latitude: 69.2416 # Southernmost_Latitude: 69.2416 # Easternmost_Longitude: -50.0272 # Westernmost_Longitude: -50.0272 # Elevation: 190 #-------------------- # Data_Collection # Collection_Name: North2013LOI # First_Year: 7271 # Last_Year: -52 # Time_Unit: cal yr BP # Core_Length: .106 # Parameter_Keywords: physical properties # Notes: #-------------------- # Chronology_Information # Chronology: # Chronology # # Table 2 # Radiocarbon ages from lake sediment cores # # Core Depth Lab Number Material Dated Fraction Modern d13C Radiocarbon Age Calibrated Age # (cm) (‰PDB) (14C yr BP) (cal yr BP ± 2S) # # Loon Lake # 08LOO-1 20 CURL-10094 plant macrofossils 0.6180±0.0009 -37.7 3865±15 4320±90 # 08LOO-1 32 CURL-10104 plant macrofossils 0.5604±0.0010 -32.1 4655±15 5390±70 # 08LOO-1 46 CURL-10088 plant macrofossils 0.5265±0.0009 -34.5 5155±15 5920±70 # 08LOO-1 61 CURL-10101 plant macrofossils 0.5206±0.0008 -29.5 5525±15 6340±50 # # North Lake # 08NOR-3 23 CURL-10089 plant macrofossils 0.7265±0.0010 -28.1 2565±15 2680±60 # 08NOR-3 40 CURL-12613 plant macrofossils 0.6746±0.0013 -24.0 3160±20 3400±40 # 08NOR-3 61 CURL-12600 plant macrofossils 0.5928±0.0009 -24.9 4200±15 4740±90 # 08NOR-3 74 CURL-10091 plant macrofossils 0.5562±0.0010 -28.6 4715±20 5450±130 # 08NOR-3 100 CURL-12603 plant macrofossils 0.4631±0.0008 -28.8 6185±15 7090±80 # 08NOR-3 103 CURL-10092 plant macrofossils 0.4006±0.0008 -12.7 7350±20 8160±120 # # Fishtote Lake # 09FTL-SC2 2 CURL-12593 plant macrofossils 0.7864±0.0012 -21.8 1930±15 1860±40 # 09FTL-SC2 36 CURL-12606 plant macrofossils 0.6438±0.0009 -28.0 3540±15 3810±80 # 09FTL-SC2 65 CURL-12601 plant macrofossils 0.4995±0.0008 -24.0 5575±15 6360±50 # 09FTL-SC2 96 CURL-12608 plant macrofossils 0.367±0.0009 -27.6 8050±20 8910±120 # # Iceboom Lake # 08ICE-5 23 CURL-10083 plant macrofossils 0.9591±0.0015 -23.5 335±15 390±80 # 08ICE-5 36 CURL-10439 plant macrofossils 0.7952±0.0019 -27.8 1840±20 1770±60 # 08ICE-5 57 CURL-10434 plant macrofossils 0.6098±0.0015 -30.7 3980±20 4470±50 # 08ICE-5 70 CURL-10441 plant macrofossils 0.4534±0.0013 -30.5 6360±25 7300±120 # # Pluto Lake # 09PLO-1 4 CURL-12609 plant macrofossils 0.7539±0.0010 -29.7 2270±15 2260±80 # 09PLO-1 25 CURL-12599 plant macrofossils 0.6232±0.0012 -28.7 3800±20 4170±70 # 09PLO-1 50 CURL-12604 plant macrofossils 0.4050±0.0011 -14.9 7260±25 8090±70 # 09PLO-1 76 CURL-12594 plant macrofossils 0.3584±0.0009 -13.3 8245±20 9210±80 # #------------------ # Variables # # PaST_Thesaurus_Download_Resource: https://www.ncdc.noaa.gov/paleo/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # variables format: shortname what,material,error,units,seasonality,data_type,detail,method, C(har) or N(umeric) data,additional information # ## age_calBP age,,,calendar year before present,,paleolimnology,,,N, ## loi550C organic matter,sediment,,weight percent,,paleolimnology,,loss on ignition,N,loss on ignition 550 degrees C for 2 hours #-------------------- # Data: # Missing_Values: NA age_calBP loi550C -52 26.4674 -42 27.6596 -34 27.1777 -25 26.4671 -16 28.6116 -6 25.5411 12 25 47 24.6531 111 21.875 208 21.8549 333 22.9686 483 25.4215 653 22.871 840 22.1457 1039 21.2828 1247 23.1313 1460 25.5102 1674 29.021 1885 23.8929 2090 23.3365 2283 22.8106 2461 23.3135 2621 26.4648 2761 25.0923 2883 25.3219 2988 23.9331 3077 22.6804 3152 24.2286 3215 22.7679 3266 23.004 3308 23.4597 3342 24.5125 3369 23.1746 3391 22.9207 3409 21.5645 3425 22.6399 3440 22.4709 3455 20.9276 3473 18.9885 3494 17.4439 3520 16.5714 3552 17.233 3589 16.5432 3631 16.8551 3677 17.6636 3728 20.3429 3782 21.473 3839 22.5434 3899 21.4022 3962 22.2482 4027 23.9882 4094 25.1799 4162 28.5473 4232 31.7557 4302 28.989 4372 34.3519 4442 29.8865 4511 29.3622 4580 33.0306 4648 30.7607 4714 35.3607 4777 32.7759 4840 35.3982 4900 34.4203 4959 34.2942 5017 30.7484 5074 32.3529 5130 36.0577 5186 30.6738 5241 39.2052 5297 31.1758 5352 31.3702 5407 30.1232 5463 31.3167 5520 28.6055 5577 24.6337 5635 19.8161 5693 28.2519 5752 30.8725 5812 29.5803 5872 27.2408 5932 31.9957 5993 29.8263 6055 19.3614 6117 21.39 6179 34.543 6241 31.0252 6304 25.5335 6368 23.0897 6431 17.6026 6495 23.2678 6559 23.5687 6623 21.0478 6688 23.619 6752 19.3548 6817 20.181 6882 21.7699 6946 21.5074 7011 18.4109 7076 19.0184 7141 18.2952 7206 17.7564 7271 13.3997