# Ørkendalen, Kangerlussuaq, Greenland Holocene Moraine 10Be Ages #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # # Online_Resource: http://www.hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID: 15814 # # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/levy2012/orkendalen2012ages.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Other Collections #--------------------------------------- # Contribution_Date # Date: 2013-12-24 #--------------------------------------- # Title # Study_Name: Ørkendalen, Kangerlussuaq, Greenland Holocene Moraine 10Be Ages #--------------------------------------- # Investigators # Investigators: Levy, L.B.; Kelly, M.A.; Howley, J.A.; Virginia, R.A. #--------------------------------------- # Description_and_Notes # Description: 10Be ages on boulders on moraines, Ørkendalen, Kangerlussuaq, Greenland #--------------------------------------- # Publication # Authors: Laura B. Levy, Meredith A. Kelly, Jennifer A. Howley, Ross A. Virginia # Published_Date_or_Year: 2012-10-02 # Published_Title: Age of the Ørkendalen moraines, Kangerlussuaq, Greenland: constraints on the extent of the southwestern margin of the Greenland Ice Sheet during the Holocene # Journal_Name: Quaternary Science Reviews # Volume: 52 # Issue: # Pages: 1-5 # Report Number: # DOI: 10.1016/j.quascirev.2012.07.021 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0277379112002880 # Full_Citation: # Abstract: Although Greenland ice core records register relatively stable Holocene climate conditions, the lower elevation margins of the Greenland Ice Sheet (GrIS) experienced significant Holocene fluctuations. These fluctuations include ice sheet recession during the Holocene Thermal Maximum (9-5 ka) and advance during the Little Ice Age (LIA; ~A.D. 1350-1880). Determining the extent and timing of these fluctuations is important for understanding the response of the GrIS to interglacial climate conditions both warmer and colder than at present and for developing accurate ice sheet models. Sets of moraines marking past extents of the southwestern GrIS margin occur in the Kangerlussuaq region. We focus on the Ørkendalen moraines, a prominent moraine set located within 2 km of the modern ice margin and just outboard of the LIA moraines. We present the first 10Be ages of the Ørkendalen moraines indicating they were deposited at 6.8 ± 0.3 ka. The geomorphic relationship between the Ørkendalen and LIA moraines indicates that the ice sheet margin was inboard of its Ørkendalen extent between ~6.8 ka and the culmination of the LIA. The age of the Ørkendalen moraines provides an important constraint on the extent of the southwestern GrIS during the middle Holocene. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 0801490 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Dartmouth College # Grant: #--------------------------------------- # Site Information # Site_Name: Ørkendalen Moraines # Location: North America>Greenland # Country: # Northernmost_Latitude: 67.212 # Southernmost_Latitude: 67.078 # Easternmost_Longitude: -50.318 # Westernmost_Longitude: -49.98 # Elevation: 250 m #--------------------------------------- # Data_Collection # Collection_Name: Ørkendalen10Be # First_Year: 7390 # Last_Year: 6290 # Time_Unit: CalYearBP # Core_Length: # Notes: #--------------------------------------- # Chronology: # 10Be ages calculated with Northeastern North American production rate using CRONUS Earth online calculator (Balco et al., 2008; 2009) #--------------------------------------- # Variables # # Data variables follow (have no #) # 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) # Sample name Latitude Longitude Elevation Elv/pressure Thickness Density Shielding Erosion rate [Be-10] +/- Be AMS # 10Be ages calculated with different scaling schemes. De = Desilets et al. (2003, 2006), Du = Dunai (2001), Li = Lifton et al. (2005), Lm = Time dependent Lal (1991)/Stone (2000), St = Constant production rate model Lal (1991)/Stone (2000). ## notes1 Notes-Sample Name, , , , , , , ,C ## notes2 Notes-Sample Latitude, , , , , , , ,N ## notes3 Notes-Sample Longitude, , , , , , , ,N ## notes4 Notes-Sample Elevation, , , m, , , , ,N ## notes5 Notes-Sample Elevation pressure flag, , , , , , , ,C ## notes6 Notes-Sample Thickness, , , cm, , , , ,N ## notes7 Notes-Sample Density, , , g/cm, , , , ,N ## notes8 Notes-Shielding Correction, , , , , , , ,N ## notes9 Notes-Erosion Rate, , , cm/year, , , , ,N ## 10Be-a/g 10Be concentration, , , atoms/g, , , , ,N ## 10Be-err 10Be concentration error, , , atoms/g, , , , ,N ## notes10 Notes-Be AMS, , , standard, , , , ,C ## notes11 Notes-Sample ID, , , , , , , ,C ## age_calkaBPDe age, , , calendar kyears before present, , , , Desilets et al. (2003, 2006),N ## age_calkaBPDu age, , , calendar kyears before present, , , , Dunai (2001),N ## age_calkaBPLi age, , , calendar kyears before present, , , , Lifton et al. (2005),N ## age_calkaBPLm age, , , calendar kyears before present, , , , Time dependent Lal (1991)/Stone (2000),N ## age_calkaBPSt age, , , calendar kyears before present, , , , Constant production rate model Lal (1991)/Stone (2000),N #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: notes1 notes2 notes3 notes4 notes5 notes6 notes7 notes8 notes9 10Be-a/g 10Be-err notes10 notes11 age_calkaBPDe age_calkaBPDu age_calkaBPLi age_calkaBPLm age_calkaBPSt LL0901 67.10505 -50.29045 247 std 1.82 2.7 0.998 0.0001 34702.6507 817.3373185 07KNSTD LL0901 6.29 ± 0.15 6.21 ± 0.15 6.14 ± 0.15 6.42 ± 0.15 6.33 ± 0.15 LL0902 67.10257 -50.28185 241 std 2.657894737 2.7 0.998 0.0001 37698.02463 1084.419321 07KNSTD LL0902 6.93 ± 0.20 6.83 ± 0.20 6.76 ± 0.20 7.07 ± 0.20 6.97 ± 0.20 LL0903 67.10144 -50.28262 242 std 1.839130435 2.7 0.998 0.0001 37835.35592 1123.446913 07KNSTD LL0903 6.89 ± 0.21 6.80 ± 0.21 6.73 ± 0.21 7.03 ± 0.21 6.93 ± 0.21 LL0904 67.0917 -50.29377 224 std 2.617391304 2.7 0.997 0.0001 36502.49001 973.7962455 07KNSTD LL0904 6.82 ± 0.18 6.73 ± 0.18 6.66 ± 0.18 6.97 ± 0.18 6.87 ± 0.18 LL0906 67.15927 -50.10227 432 std 2.008333333 2.7 0.999 0.0001 44169.37904 972.8581204 07KNSTD LL0906 6.74 ±0.15 6.64 ±0.15 6.56 ±0.15 6.82 ±0.15 6.72 ± 0.15 LL0907 67.15778 -50.10448 434 std 2.48 2.7 0.996 0.0001 45597.14842 1190.470908 07KNSTD LL0907 6.99 ± 0.18 6.89 ± 0.18 6.80 ± 0.18 7.07 ± 0.18 6.97 ± 0.18 LL0908 67.15768 -50.1054 423 std 1.566666667 2.7 0.977 0.0001 47159.56022 1448.166224 07KNSTD LL0908 7.39 ± 0.23 7.29 ± 0.23 7.19 ± 0.23 7.48 ± 0.23 7.38 ± 0.23 LL0909 67.16109 -50.11912 449 std 1.64137931 2.7 0.998 0.0001 43225.36285 1350.228281 07KNSTD LL0909 6.46 ± 0.20 6.37 ± 0.20 6.29 ± 0.20 6.54 ± 0.20 6.45 ± 0.20 LL0911 67.16158 -50.11628 458 std 2.645 2.7 0.984 0.0001 43558.70814 1126.543245 07KNSTD LL0911 6.61 ± 0.17 6.52 ± 0.17 6.44 ± 0.17 6.69 ± 0.17 6.60 ± 0.17