# Bregne Ice Cap East Greenland Holocene Paleolimnology Data #----------------------------------------------------------------------- # 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:16014 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014ms.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleolimnology #--------------------------------------- # Contribution_Date # Date: 2014-01-17 #--------------------------------------- # Title: # Study_Name: Bregne Ice Cap East Greenland Holocene Paleolimnology Data # #--------------------------------------- # Investigators: # Investigators: Levy, L.B.; Kelly, M.A.; Lowell, T.V.; Hall, B.L.; Hempel, L.A.; Honsaker, W.M.; Lusas, A.R.; Howley, J.A.; Axford, Y.L. #--------------------------------------- # Description and Notes # Description: Lake sediment analyses (MS, LOI, grainsize, 14C dating, Biogenic silica) from lakes near Bregne ice cap, Scoresby Sund, eastern Greenland. # Also included are 10Be ages from boulders on the historical moraines and boulders and bedrock just distal to the historical moraines. #--------------------------------------- # Publication # Authors: Laura B. Levy, Meredith A. Kelly, Thomas V. Lowell, Brenda L. Hall, Laura A. Hempel, William M. Honsaker, Amanda R. Lusas, Jennifer A. Howley, Yarrow L. Axford # Published_Date_or_Year: in press # Published_Title: Holocene fluctuations of Bregne ice cap, Scoresby Sund, east Greenland: a proxy for climate along the Greenland Ice Sheet margin # Journal_Name: Quaternary Science Reviews # Volume: # Issue: # Pages: # Report Number: # DOI: 10.1016/j.quascirev.2013.06.024 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0277379113002448 # Abstract: The Greenland Ice Sheet is a major component of the Arctic cryosphere and the magnitude of its response to future climate changes remains uncertain. Longer-term records of climate near the ice sheet margin provide information about natural climate variability and can be used to understand the causes of past changes in the Greenland Ice Sheet. As a proxy for Holocene climate near the ice sheet margin, we reconstruct the fluctuations of Bregne ice cap in the Scoresby Sund region of central east Greenland. Bregne is a small ice cap (2.5 km2 in area) and responds sensitively to summer temperatures. We employ a multi-proxy approach to reconstruct the ice cap fluctuations using geomorphic mapping, 10Be ages of boulders and bedrock and lake sediment records. # Past extents of Bregne ice cap are marked by moraines and registered by sediments in downvalley lakes. 10Be ages of bedrock and boulders outboard of the moraines indicate that Bregne ice cap was within ~250 m of its present-day limit by at least 10.7 ka. Multi-proxy data from sediments in Two Move lake, located downvalley from Bregne ice cap, indicate that the ice cap likely completely disappeared during early and middle Holocene time. Increasing magnetic susceptibility and percent clastic material from ~6.5 to ~1.9 cal ka BP in Two Move lake sediments suggest progressively colder conditions and increased snow accumulation on the highlands west of the lake. Laminated silt deposited at ~2.6 cal ka BP and ~1.9 cal ka BP to present registers the onset and persistence of Bregne ice cap during the late Holocene. 10Be ages of boulders on an unweathered, unvegetated moraine in the Bregne ice cap forefield range from 0.74 to 9.60 ka. The youngest 10Be age (0.74 ka) likely represents the age of the moraine whereas older ages may be due to 10Be inherited from prior periods of exposure. This late Holocene moraine marks the second largest advance of the ice cap since deglaciation of the region at the end of the last ice age. The oldest moraine in the forefield dates to <=2.6 cal ka BP. The fluctuations of Bregne ice cap were likely influenced by Northern Hemisphere summer insolation throughout the Holocene and abrupt late Holocene cold events. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 0909270 #--------------------------------------- # Site Information # Site_Name: Two Move Lake # Location: North America>Greenland # Northernmost_Latitude: 70.907 # Southernmost_Latitude: 70.907 # Easternmost_Longitude: -25.591 # Westernmost_Longitude: -25.591 # Elevation: 790 m #--------------------------------------- # Data_Collection # Collection_Name: TwoMoveLakeMS # First_Year: 10000 # Last_Year: 0 # Time_Unit: cal yr BP # Core_Length: 0.60m # Notes: #--------------------------------------- # Chronology: # Radiocarbon chronology for sediment cores near Bregne ice cap # Core TML= Two Move lake, LCL = Last Chance lake, LAST = Last Move lake # Type Sample material. AP = aquatic plant, Bulk = bulk sediment, IM = insect material # F Modern Fraction modern and error # Age Radiocarbon age in 14C yr BP # Age Err Radiocarbon age error in 14C yr BP # d13C Delta 13C. NM = not measured # d13C Source Delta 13C source NM = not measured # Cal yr BP range Calibrated age range in cal yr BP (2 sigma range) (Calib 6.0, INTCAL09) # Cal yr BP Midpoint of calibrated age range with error in cal yr BP # Core Horizon (cm) Absolute depth (cm) Type Accession # F Modern Age Age Err d13C d13C Source Cal yr BP range Cal yr BP # TML10-1A-2L-1 28 36 AP OS-98646 0.8256±0.0027 1540 25 -35.52 Measured 1370-1519 1445 ± 75 # TML10-1A-2L-1 33.5 39 Bulk OS-86683 0.7008±0.0027 2850 30 -33.52 Measured 2880-3060 2960 ± 100 # TML10-1A-2L-1 34 39.25 AP OS-86684 0.7135±0.0028 2710 30 -33.18 Measured 2760-2860 2810 ± 50 # TML10-1A-2L-1 35 40 AP OS-98647 0.7231±0.0028 2600 30 NM NM 2620-2771 2695 ± 75 # TML10-1C-1N-1 45 35 AP OS-98651 0.8137±0.0035 1660 35 -36.26 Measured 1418-1692 1555 ± 135 # TML10-1C-1N-1 48.5 38.5 Bulk OS-98750 0.7178±0.0033 2660 35 -34.13 Measured 2742-2844 2790 ± 50 # TML10-1C-1N-1 54 54 Bulk OS-86554 0.3685±0.0017 8020 35 -28.77 Measured 8770-9010 8890 ± 120 # TML10-1C-1N-1 54 54 Bulk OS-90188 0.3572±0.0017 8270 35 -29.79 Measured 9130-9400 9270 ± 140 # LCL10-1A-1N-1 16.5 16.5 IM OS-94704 0.7855±0.0061 1940 60 -28.57 Measured 1721-2035 1880 ± 160 # LCL10-1A-1N-1 33 33 AP OS-94705 0.5969±0.0049 4140 65 -25.88 Measured 4450-4838 4640 ± 190 # LCL10-1A-1N-1 38 38 AP OS-94701 0.5756±0.0039 4440 55 -25.45 Measured 4872-5286 5080 ± 210 # LCL10-1A-1N-1 50.5 50.5 IM OS-95134 0.4432±0.0058 6540 100 -26.73 Measured 7265-7590 7750 ± 160 # LCL10-1A-1N-1 65.75 65.75 IM OS-94700 0.3300±0.0036 8900 85 -23.76 Measured 9705-10224 9960 ± 260 # LCL10-1C-1L-1 21 35.5 AP OS-86687 0.5998±0.0025 4100 35 -26.43 Measured 4450-4820 4635 ± 185 # LCL10-1C-1L-1 48.5 49.25 AP OS-86710 0.4778±0.0025 5930 40 -26.19 Measured 6670-6880 6775 ± 105 # LCL10-1D-1L-1 10 47 AP OS-94698 0.5046±0.0029 5490 45 -25.69 Measured 6207-6397 6300 ± 100 # LCL10-1D-1L-1 19.25 56.25 IM OS-94703 0.4951±0.0045 5650 70 -24.98 Measured 6300-6628 6460 ± 160 # LCL10-1D-1L-1 30.5 67.5 IM OS-95133 0.3332±0.0125 8830 300 NM NM 9137-10690 9910 ± 780 # LCL10-1D-1L-1 45 82 AP OS-90460 0.5576±0.0071 4690 100 -26.64 Measured 5050-5610 5330 ± 280 # LCL10-1D-1L-1 47.5 84.5 AP OS-95132 0.7084±0.0104 2770 120 -27.55 Measured 2543-3262 2900 ± 360 # LAST10-1A-1L-1 10 10 AP OS-86680 0.648±0.0025 3480 30 -20.41 Measured 3650-3840 3735 ± 85 # LAST10-1A-1L-1 11 11 Bulk OS-86753 0.6263±0.0032 3760 40 -22.89 Measured 3990-4240 4115 ± 125 # LAST10-1A-1L-1 45 45 AP OS-86715 0.4971±0.0023 5610 35 -24.32 Measured 6300-6460 6380 ± 80 # LAST10-1A-1L-1 45 45 Bulk OS-86555 0.4898±0.0025 5730 40 -20.26 Measured 6410-6640 6525 ± 115 # LAST10-2A-1N-1 8 8 Bulk 348333 0.6131±0.0023 3930 30 -23.1 Measured 4250-4510 4380 ± 130 # LAST10-2A-1N-1 12 12 Bulk 348334 0.5804±0.0022 4370 30 -23.4 Measured 4860-5040 4950 ± 90 # # "Radiocarbon ages are calibrated with Calib 6.0 and IntCal09 (Reimer et al., 2009; Stuiver et al., 2010)" # # Age Models # Lake Depth (cm) Age Model With y=depth and x = cal yr BP # TML 0-33.5 y=0.0225x R^2=1 # TML 33.5-48 y=-3e-07x^2 + 0.0019x +31.237 R^2=99.62 # TML 48-54 y=0.0015x + 40.516 R^2=1 # # LCL 0-16.6 y=0.0088x R^2=1 # 16.6- y=-8e-8x^2 + 0.0071x + 3.6313 R^2 = 0.9893 # #--------------------------------------- # 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) # ## depth_cm_sec depth in section, , , cm, , , , ,N ## depth_cm depth, , , cm, , , , ,N ## susc_si Magnetic susceptibility, , , SIx10^-5, , , , ,N ## notesCoreID notesCore ID, , , , , , , ,C #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: depth_cm_sec depth_cm susc_si notesCoreID 11 1 13.2 TML-1C-1N-1 11.5 1.5 13.5 TML-1C-1N-1 12 2 11.8 TML-1C-1N-1 12.5 2.5 14.8 TML-1C-1N-1 13 3 17.5 TML-1C-1N-1 13.5 3.5 22.7 TML-1C-1N-1 14 4 17.5 TML-1C-1N-1 14.5 4.5 21 TML-1C-1N-1 15 5 20.8 TML-1C-1N-1 15.5 5.5 20.1 TML-1C-1N-1 16 6 19.2 TML-1C-1N-1 16.5 6.5 19.1 TML-1C-1N-1 17 7 17.9 TML-1C-1N-1 17.5 7.5 18.5 TML-1C-1N-1 18 8 19.4 TML-1C-1N-1 18.5 8.5 18 TML-1C-1N-1 19 9 17.6 TML-1C-1N-1 19.5 9.5 18.7 TML-1C-1N-1 20 10 16.9 TML-1C-1N-1 20.5 10.5 17.7 TML-1C-1N-1 21 11 18.5 TML-1C-1N-1 21.5 11.5 18.8 TML-1C-1N-1 22 12 20.3 TML-1C-1N-1 22.5 12.5 17.9 TML-1C-1N-1 23 13 17.5 TML-1C-1N-1 23.5 13.5 20 TML-1C-1N-1 24 14 20.6 TML-1C-1N-1 24.5 14.5 20.6 TML-1C-1N-1 25 15 19.8 TML-1C-1N-1 25.5 15.5 20.2 TML-1C-1N-1 26 16 19.6 TML-1C-1N-1 26.5 16.5 19.6 TML-1C-1N-1 27 17 19.2 TML-1C-1N-1 27.5 17.5 20.2 TML-1C-1N-1 28 18 20.7 TML-1C-1N-1 28.5 18.5 22.1 TML-1C-1N-1 29 19 20.6 TML-1C-1N-1 29.5 19.5 21.8 TML-1C-1N-1 30 20 23.5 TML-1C-1N-1 30.5 20.5 22.1 TML-1C-1N-1 31 21 20.3 TML-1C-1N-1 31.5 21.5 21.8 TML-1C-1N-1 32 22 23.6 TML-1C-1N-1 32.5 22.5 22.4 TML-1C-1N-1 33 23 19.8 TML-1C-1N-1 33.5 23.5 18.9 TML-1C-1N-1 34 24 18.3 TML-1C-1N-1 34.5 24.5 20.1 TML-1C-1N-1 35 25 20.7 TML-1C-1N-1 35.5 25.5 19 TML-1C-1N-1 36 26 20 TML-1C-1N-1 36.5 26.5 21.3 TML-1C-1N-1 37 27 20.9 TML-1C-1N-1 37.5 27.5 20.7 TML-1C-1N-1 38 28 18.4 TML-1C-1N-1 38.5 28.5 18.5 TML-1C-1N-1 39 29 17.5 TML-1C-1N-1 39.5 29.5 20.9 TML-1C-1N-1 40 30 19.9 TML-1C-1N-1 40.5 30.5 17.5 TML-1C-1N-1 41 31 16.3 TML-1C-1N-1 41.5 31.5 16 TML-1C-1N-1 42 32 15.1 TML-1C-1N-1 42.5 32.5 14.8 TML-1C-1N-1 43 33 16.4 TML-1C-1N-1 43.5 33.5 16.4 TML-1C-1N-1 44 34 15.6 TML-1C-1N-1 44.5 34.5 11.7 TML-1C-1N-1 45 35 18.8 TML-1C-1N-1 45.5 35.5 24.2 TML-1C-1N-1 46 36 43.2 TML-1C-1N-1 46.5 36.5 21.7 TML-1C-1N-1 47 37 59.5 TML-1C-1N-1 47.5 37.5 57.6 TML-1C-1N-1 48 38 51.2 TML-1C-1N-1 48.5 38.5 46.5 TML-1C-1N-1 49 39 38.5 TML-1C-1N-1 49.5 39.5 46.6 TML-1C-1N-1 50 40 35.7 TML-1C-1N-1 50.5 40.5 35.5 TML-1C-1N-1 51 41 35.9 TML-1C-1N-1 51.5 41.5 33.5 TML-1C-1N-1 52 42 31.6 TML-1C-1N-1 52.5 42.5 29.7 TML-1C-1N-1 53 43 29.4 TML-1C-1N-1 53.5 43.5 30.8 TML-1C-1N-1 54 44 28 TML-1C-1N-1 54.5 44.5 29.9 TML-1C-1N-1 55 45 25.9 TML-1C-1N-1 55.5 45.5 25.8 TML-1C-1N-1 56 46 26 TML-1C-1N-1 56.5 46.5 22.1 TML-1C-1N-1 57 47 22.3 TML-1C-1N-1 57.5 47.5 18.4 TML-1C-1N-1 58 48 19.5 TML-1C-1N-1 58.5 48.5 13.9 TML-1C-1N-1 59 49 9.4 TML-1C-1N-1 59.5 49.5 6.4 TML-1C-1N-1 60 50 3.7 TML-1C-1N-1 60.5 50.5 2.5 TML-1C-1N-1 61 51 3.2 TML-1C-1N-1 61.5 51.5 3.3 TML-1C-1N-1 62 52 1.9 TML-1C-1N-1 62.5 52.5 1 TML-1C-1N-1 63 53 0.6 TML-1C-1N-1 63.5 53.5 0.4 TML-1C-1N-1 64 54 0.3 TML-1C-1N-1 64.5 54.5 0.3 TML-1C-1N-1 65 55 0.6 TML-1C-1N-1 65.5 55.5 4.9 TML-1C-1N-1 66 56 10.7 TML-1C-1N-1 66.5 56.5 9.8 TML-1C-1N-1 67 57 9.4 TML-1C-1N-1 67.5 57.5 7.2 TML-1C-1N-1 68 58 3.5 TML-1C-1N-1 68.5 58.5 3.1 TML-1C-1N-1 69 59 3.9 TML-1C-1N-1 69.5 59.5 4.3 TML-1C-1N-1 70 60 3.7 TML-1C-1N-1