# Rwenzori Mountains Cosmogenic Nuclide Beryllium-10 Data of Glacial Features over the Past 30 ka #----------------------------------------------------------------------- # 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 downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/37178 # 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-other-37178.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Other Collections # # Dataset_DOI: 10.25921/5d2y-n304 # # Science_Keywords: Glaciers and Ice Sheets Reconstruction, Last Glacial Maximum, Tropics #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/kelly2019/kelly2019-mubuku_10-be.txt # Data_Download_Description: NOAA Template File; 10-Be Data # #--------------------------------------- # Contribution_Date # Date: 2022-12-30 #--------------------------------------- # File_Last_Modified_Date # Date: 2023-03-10 #--------------------------------------- # Title # Study_Name: Rwenzori Mountains Cosmogenic Nuclide Beryllium-10 Data of Glacial Features over the Past 30 ka #--------------------------------------- # Investigators # Investigators: Kelly, Meredith (https://orcid.org/0000-0001-8163-3907); Jackson, Margaret (https://orcid.org/0000-0001-7613-752X) #--------------------------------------- # Description_Notes_and_Keywords # Description: Metadata for 115 samples for surface exposure dating using the cosmogenic nuclide berylllium-10 (10Be) of glacial features in the Rwenzori Mountains, Uganda. The samples were collected from 2009-2019. #--------------------------------------- # Publication # Authors: Jackson MS, Kelly MA, Russell JM, Doughty AM, Howley JA, Chipman JW, Cavagnaro D, Nakileza B, Zimmerman SH # Published_Date_or_Year: 2019-12-11 # Published_Title: High-latitude warming initiated the onset of the last deglaciation in the tropics # Journal_Name: Science Advances # Volume: 5 # Edition: # Issue: 12 # Pages: eaaw2610 # Report_Number: # DOI: 10.1126/sciadv.aaw2610 # Online_Resource: # Full_Citation: # Abstract: Atmospheric greenhouse gas concentrations are thought to have synchronized global temperatures during Pleistocene glacial–interglacial cycles, yet their impact relative to changes in high-latitude insolation and ice-sheet extent remains poorly constrained. Here, we use tropical glacial fluctuations to assess the timing of low-latitude temperature changes relative to global climate forcings. We report 10Be ages of moraines in tropical East Africa and South America and show that glaciers reached their maxima at ~29 to 20 ka, during the global Last Glacial Maximum. Tropical glacial recession was underway by 20 ka, before the rapid CO2 rise at ~18.2 ka. This “early” tropical warming was influenced by rising high-latitude insolation and coincident ice-sheet recession in both polar regions, which lowered the meridional thermal gradient and reduced tropical heat export to the high latitudes. #--------------------------------------- # Publication # Authors: Jackson MS, Kelly MA, Russell JM, Doughty AM, Howley JA, Chipman JW, Cavagnaro DA, Baber MB, Zimmerman SRH, Nakileza B # Published_Date_or_Year: 2020-09-01 # Published_Title: Glacial fluctuations in tropical Africa during the last glacial termination and implications for tropical climate following the Last Glacial Maximum # Journal_Name: Quaternary Science Reviews # Volume: 243 # Edition: # Issue: # Pages: # Report_Number: 106455 # DOI: 10.1016/j.quascirev.2020.106455 # Online_Resource: # Full_Citation: # Abstract: The tropics are a dynamic component of the global climate system and exert a profound influence on modern climate variability. Yet the role of the tropics in past climate changes, for example during the last glacial termination, is uncertain. This uncertainty is due in part to the relative paucity of terrestrial temperature records from the tropics, which hinders efforts to understand the mechanisms that influenced deglacial warming and abrupt climate events. Tropical glaciers are sensitive to changes in climate, and mapping and dating past tropical glacial fluctuations provides a valuable record of terrestrial climate changes in the low latitudes.We report a chronology of past glacial extents in the Rwenzori Mountains of Uganda (0.3°N, 29.9°E) based on 51 beryllium-10 (10Be) surface-exposure ages from three separate glacial catchments. Results indicate that Rwenzori glaciers retreated considerably during Heinrich Stadial 1. The rate of net glacial recession slowed between ~15 and 11 ka, although glaciers continued to retreat during this period. Rwenzori glaciers then retreated more rapidly during the early Holocene. The Rwenzori glacial chronology is broadly similar to glacial chronologies reconstructed elsewhere in East Africa and in tropical South America. We suggest that this similarity may reflect coherent, tropics-wide temperature fluctuations during the last deglaciation. The Rwenzori glacial chronology provides crucial information on the global footprint of deglacial warming and abrupt climate events and, thus, the potential mechanisms that influenced tropical climate during the last glacial termination. #--------------------------------------- # Publication # Authors: Vickers AC, Shakun JD, Goehring BM, Gorin A, Kelly MA, Jackson MS, Doughty AD, Russell JM # Published_Date_or_Year: 2021-02-01 # Published_Title: Similar Holocene glaciation histories in tropical South America and Africa # Journal_Name: Geology # Volume: 49 # Edition: # Issue: 2 # Pages: 140-144 # Report_Number: # DOI: 10.1130/G48059.1 # Online_Resource: # Full_Citation: # Abstract: Tropical glaciers have retreated alongside warming temperatures over the past century, yet the way in which these trends fit into a long-term geological context is largely unclear. Here, we present reconstructions of Holocene glacier extents relative to today from the Quelccaya ice cap (Peru) and the Rwenzori Mountains (Uganda) based on measurements of in situ 14C and 10Be from recently exposed bedrock. Ice-extent histories are similar at both sites and suggest that ice was generally smaller than today during the first half of the Holocene and larger than today for most, if not all, of the past several millennia. The similar glaciation history in South America and Africa suggests that large-scale warming followed by cooling of the tropics during the late Holocene primarily drove ice extent, rather than regional changes in precipitation. Our results also imply that recent tropical ice retreat is anomalous in a multimillennial context. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: EAR-1222705, GSS-1558358, EAR-1702293 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Comer Family Foundation # Grant: CP103, CCF1 #--------------------------------------- # Site_Information # Site_Name: Mubuku Valley, Rwenzori Mountains # Location: Uganda # Northernmost_Latitude: 0.35828 # Southernmost_Latitude: 0.34059 # Easternmost_Longitude: 29.97910 # Westernmost_Longitude: 29.95181 # Elevation_m: #--------------------------------------- # Data_Collection # Collection_Name: Mubuku_10-Be # First_Year: # Last_Year: # Time_Unit: # Core_Length_m: # Parameter_Keywords: # Notes: #--------------------------------------- # Chronology_Information # Chronology: # # Sample_ID Sample_type Associated_landform Publication Latitude(DD) Longitude(DD) Elev(m) Thickness(cm) Density(g/cm3) Shielding 10-Be(atoms/g) 10-Be_error(atoms/g) Year Cathode_ID Quartz(g) Carrier_wt(mg) Carrier_conc(ppm) Sample(10-Be/9-Be) Sample_error(10-Be/9-Be) Process Blank Blank(10-Be/9-Be) Blank_error(10-Be/9-Be) # RZ-16-41 Moraine Boulder Mubuku 0 Jackson et al. (2020) 0.34533 29.95181 2955 1.4 2.65 0.965 174463 4317 2016 BE43141 3.1667 0.1548 1.349 3.96E-14 9.80E-16 BE43147 5.69E-16 1.27E-16 # RZ-16-43 Moraine Boulder Mubuku 0 Jackson et al. (2020) 0.34547 29.95206 2975 2.8 2.65 0.965 214908 5369 2016 BE43142 3.0083 0.1576 1.349 4.55E-14 1.14E-15 BE43147 5.69E-16 1.27E-16 # RZ-16-44 Moraine Boulder Mubuku 0 Jackson et al. (2020) 0.34543 29.95196 2948 2.1 2.65 0.942 190167 4903 2016 BE43143 3.0327 0.1562 1.349 4.10E-14 1.06E-15 BE43147 5.69E-16 1.27E-16 # RZ-16-46a Moraine Boulder Mahoma 0 moraine Jackson et al. (2019) 0.34734 29.96118 2922 2.69 2.65 0.975 286711 6356 2016 BE43144 2.0504 0.1569 1.349 4.16E-14 9.21E-16 BE43147 5.69E-16 1.27E-16 # RZ-16-47a Moraine Boulder Mahoma 0 moraine Jackson et al. (2019) 0.34734 29.96118 2922 2.16 2.65 0.976 263082 7208 2016 BE43145 2.1000 0.1566 1.349 3.91E-14 1.07E-15 BE43147 5.69E-16 1.27E-16 # RZ-16-48a Moraine Boulder Mahoma 0 moraine Jackson et al. (2019) 0.34735 29.96119 2923 1.72 2.65 0.973 273628 9035 2016 BE43146 2.0285 0.1574 1.349 3.91E-14 1.29E-15 BE43147 5.69E-16 1.27E-16 # RZ-16-46 Moraine Boulder Mahoma 0 moraine Jackson et al. (2019) 0.34734 29.96118 2922 2.69 2.65 0.975 290173 6799 2016 BE42276 5.0422 0.1526 1.346 1.07E-13 2.50E-15 BE42279 1.05E-15 1.91E-16 # RZ-16-47 Moraine Boulder Mahoma 0 moraine Jackson et al. (2019) 0.34734 29.96118 2922 2.16 2.65 0.976 318066 5837 2016 BE42277 5.0181 0.1825 1.346 9.72E-14 1.78E-15 BE42279 1.05E-15 1.91E-16 # RZ-16-48 Moraine Boulder Mahoma 0 moraine Jackson et al. (2019) 0.34735 29.96119 2923 1.72 2.65 0.973 263376 5496 2016 BE42278 5.1793 0.1484 1.346 1.02E-13 2.13E-15 BE42279 1.05E-15 1.91E-16 # RZ-12-01 Moraine Boulder Mahoma 1 moraine Jackson et al. (2019) 0.35828 29.97910 2635 2.14 2.65 0.994 291543 5576 2012 BE34425 6.0131 0.1584 1.32 1.25E-13 2.40E-15 BE34433 2.54E-16 1.10E-16 # RZ-12-07 Moraine Boulder Mahoma 1 moraine Jackson et al. (2019) 0.35033 29.96812 2955 1.00 2.65 0.978 346969 11758 2012 BE34430 5.9925 0.1617 1.32 1.46E-13 4.94E-15 BE34433 2.54E-16 1.10E-16 # RZ-12-08 Moraine Boulder Mahoma 1 moraine Jackson et al. (2019) 0.34985 29.96804 2953 2.13 2.65 0.978 341471 6979 2012 BE34431 5.9983 0.1626 1.32 1.43E-13 2.92E-15 BE34433 2.54E-16 1.10E-16 # RZ-12-08a Moraine Boulder Mahoma 1 moraine Jackson et al. (2019) 0.34985 29.96804 2953 2.13 2.65 0.978 341595 6445 2012 BE41129 7.0494 0.1640 1.341 1.64E-13 3.09E-15 BE41134 8.48E-16 2.32E-16 # RZ-12-09 Moraine Boulder Mahoma 1 moraine Jackson et al. (2019) 0.35210 29.96934 2922 1.00 2.65 1.000 326609 6243 2012 BE34432 6.0115 0.1597 1.32 1.39E-13 2.66E-15 BE34433 2.54E-16 1.10E-16 # RZ-12-02 Moraine Boulder Mahoma 2 moraine Jackson et al. (2019) 0.34597 29.96798 2988 2.26 2.65 1.000 398870 7611 2012 BE34426 6.0026 0.1600 1.32 1.70E-13 3.24E-15 BE34433 2.54E-16 1.10E-16 # RZ-12-02a Moraine Boulder Mahoma 2 moraine Jackson et al. (2019) 0.34597 29.96798 2988 2.26 2.65 1.000 396922 6504 2012 BE41128 7.0782 0.1639 1.341 1.91E-13 3.13E-15 BE41134 8.48E-16 2.32E-16 # RZ-12-03 Moraine Boulder Mahoma 2 moraine Jackson et al. (2019) 0.34597 29.96798 2988 1.79 2.65 1.000 405605 7743 2012 BE34427 6.0282 0.1593 1.32 1.74E-13 3.32E-15 BE34433 2.54E-16 1.10E-16 # RZ-12-04 Moraine Boulder Mahoma 2 moraine Jackson et al. (2019) 0.34449 29.96896 2986 2.32 2.65 1.000 417238 9293 2012 BE34428 6.0002 0.1615 1.32 1.76E-13 3.92E-15 BE34433 2.54E-16 1.10E-16 # RZ-12-05 Moraine Boulder Mahoma 2 moraine Jackson et al. (2019) 0.34410 29.96864 2989 2.89 2.65 1.000 403011 7700 2012 BE34429 5.9939 0.1604 1.32 1.71E-13 3.26E-15 BE34433 2.54E-16 1.10E-16 # RZ-13-63 Moraine Boulder Mahoma 3 moraine Jackson et al. (2019) 0.34327 29.96927 2947 2.20 2.65 0.982 406004 7589 2013 BE40304 4.0866 0.1605 1.34 1.15E-13 2.16E-15 BE40308 7.22E-16 1.41E-16 # RZ-13-64 Moraine Boulder Mahoma 3 moraine Jackson et al. (2019) 0.34398 29.96972 2936 2.16 2.65 0.991 449547 8383 2013 BE40305 4.1512 0.1640 1.34 1.27E-13 2.37E-15 BE40308 7.22E-16 1.41E-16 # RZ-13-66 Moraine Boulder Mahoma 3 moraine Jackson et al. (2019) 0.34471 29.97026 2940 3.25 2.65 0.995 441571 8248 2013 BE40306 4.0284 0.1626 1.34 1.22E-13 2.28E-15 BE40308 7.22E-16 1.41E-16 # RZ-13-67 Moraine Boulder Mahoma 3 moraine Jackson et al. (2019) 0.34528 29.97071 2927 2.47 2.65 0.995 460279 7463 2013 BE40307 4.0547 0.1627 1.34 1.28E-13 2.08E-15 BE40308 7.22E-16 1.41E-16 # RZ-16-49 Moraine Boulder Mahoma 4 moraine Jackson et al. (2019) 0.34090 29.96863 2943 1.08 2.65 0.986 453420 8878 2016 BE41586 3.0692 0.1523 1.342 1.02E-13 2.00E-15 BE41593 2.04E-15 3.36E-16 # RZ-16-50 Moraine Boulder Mahoma 4 moraine Jackson et al. (2019) 0.34098 29.96863 2941 2.34 2.65 0.986 470693 12261 2016 BE41587 3.0391 0.1531 1.342 1.04E-13 2.71E-15 BE41593 2.04E-15 3.36E-16 # RZ-16-52 Moraine Boulder Mahoma 4 moraine Jackson et al. (2019) 0.34102 29.96870 2939 2.87 2.65 0.987 428831 10782 2016 BE41588 3.0893 0.1535 1.342 9.62E-14 2.42E-15 BE41593 2.04E-15 3.36E-16 # RZ-16-54 Moraine Boulder Mahoma 4 moraine Jackson et al. (2019) 0.34059 29.96819 2933 4.01 2.65 0.990 434683 9436 2016 BE41589 3.0421 0.1525 1.342 9.67E-14 2.10E-15 BE41593 2.04E-15 3.36E-16 # RZ-16-55 Moraine Boulder Mahoma 4 moraine Jackson et al. (2019) 0.34059 29.96819 2933 3.52 2.65 0.990 456412 7864 2016 BE41590 3.0099 0.1535 1.342 9.98E-14 1.72E-15 BE41593 2.04E-15 3.36E-16 # RZ-16-56 Moraine Boulder Mahoma 4 moraine Jackson et al. (2019) 0.34121 29.96873 2932 4.64 2.65 0.982 454357 7829 2016 BE41591 3.0099 0.1512 1.342 1.01E-13 1.74E-15 BE41593 2.04E-15 3.36E-16 # # Cronus Earth Formatted # Sample_ID Latitude(DD) Longitude(DD) Elev(m) Pressure Thickness(cm) Density(g/cm3) Shielding Erosion_Rate(cm/yr) Year Process_Blank(Cathode_ID) Nuclide Mineral 10-Be_Conc 10-Be_Uncert(atoms/g) Standard(atoms/g) # RZ-16-41 0.34533 29.95181 2955 std 1.4 2.65 0.965 0 2016; RZ-16-41 Be-10 Quartz 174463 4317 07KNSTD; # RZ-16-43 0.34547 29.95206 2975 std 2.8 2.65 0.965 0 2016; RZ-16-43 Be-10 Quartz 214908 5369 07KNSTD; # RZ-16-44 0.34543 29.95196 2948 std 2.1 2.65 0.942 0 2016; RZ-16-44 Be-10 Quartz 190167 4903 07KNSTD; # RZ-16-46a 0.34734 29.96118 2922 std 2.69 2.65 0.975 0 2016; RZ-16-46a Be-10 Quartz 286711 6356 07KNSTD; # RZ-16-47a 0.34734 29.96118 2922 std 2.16 2.65 0.976 0 2016; RZ-16-47a Be-10 Quartz 263082 7208 07KNSTD; # RZ-16-48a 0.34735 29.96119 2923 std 1.72 2.65 0.973 0 2016; RZ-16-48a Be-10 Quartz 273628 9035 07KNSTD; # RZ-16-46 0.34734 29.96118 2922 std 2.69 2.65 0.975 0 2016; RZ-16-46 Be-10 Quartz 290173 6799 07KNSTD; # RZ-16-47 0.34734 29.96118 2922 std 2.16 2.65 0.976 0 2016; RZ-16-47 Be-10 Quartz 318066 5837 07KNSTD; # RZ-16-48 0.34735 29.96119 2923 std 1.72 2.65 0.973 0 2016; RZ-16-48 Be-10 Quartz 263376 5496 07KNSTD; # RZ-12-01 0.35828 29.97910 2635 std 2.14 2.65 0.994 0 2012; RZ-12-01 Be-10 Quartz 291543 5576 07KNSTD; # RZ-12-07 0.35033 29.96812 2955 std 1.00 2.65 0.978 0 2012; RZ-12-07 Be-10 Quartz 346969 11758 07KNSTD; # RZ-12-08 0.34985 29.96804 2953 std 2.13 2.65 0.978 0 2012; RZ-12-08 Be-10 Quartz 341471 6979 07KNSTD; # RZ-12-08a 0.34985 29.96804 2953 std 2.13 2.65 0.978 0 2012; RZ-12-08a Be-10 Quartz 341595 6445 07KNSTD; # RZ-12-09 0.35210 29.96934 2922 std 1.00 2.65 1.000 0 2012; RZ-12-09 Be-10 Quartz 326609 6243 07KNSTD; # RZ-12-02 0.34597 29.96798 2988 std 2.26 2.65 1.000 0 2012; RZ-12-02 Be-10 Quartz 398870 7611 07KNSTD; # RZ-12-02a 0.34597 29.96798 2988 std 2.26 2.65 1.000 0 2012; RZ-12-02a Be-10 Quartz 396922 6504 07KNSTD; # RZ-12-03 0.34597 29.96798 2988 std 1.79 2.65 1.000 0 2012; RZ-12-03 Be-10 Quartz 405605 7743 07KNSTD; # RZ-12-04 0.34449 29.96896 2986 std 2.32 2.65 1.000 0 2012; RZ-12-04 Be-10 Quartz 417238 9293 07KNSTD; # RZ-12-05 0.34410 29.96864 2989 std 2.89 2.65 1.000 0 2012; RZ-12-05 Be-10 Quartz 403011 7700 07KNSTD; # RZ-13-63 0.34327 29.96927 2947 std 2.20 2.65 0.982 0 2013; RZ-13-63 Be-10 Quartz 406004 7589 07KNSTD; # RZ-13-64 0.34398 29.96972 2936 std 2.16 2.65 0.991 0 2013; RZ-13-64 Be-10 Quartz 449547 8383 07KNSTD; # RZ-13-66 0.34471 29.97026 2940 std 3.25 2.65 0.995 0 2013; RZ-13-66 Be-10 Quartz 441571 8248 07KNSTD; # RZ-13-67 0.34528 29.97071 2927 std 2.47 2.65 0.995 0 2013; RZ-13-67 Be-10 Quartz 460279 7463 07KNSTD; # RZ-16-49 0.34090 29.96863 2943 std 1.08 2.65 0.986 0 2016; RZ-16-49 Be-10 Quartz 453420 8878 07KNSTD; # RZ-16-50 0.34098 29.96863 2941 std 2.34 2.65 0.986 0 2016; RZ-16-50 Be-10 Quartz 470693 12261 07KNSTD; # RZ-16-52 0.34102 29.96870 2939 std 2.87 2.65 0.987 0 2016; RZ-16-52 Be-10 Quartz 428831 10782 07KNSTD; # RZ-16-54 0.34059 29.96819 2933 std 4.01 2.65 0.990 0 2016; RZ-16-54 Be-10 Quartz 434683 9436 07KNSTD; # RZ-16-55 0.34059 29.96819 2933 std 3.52 2.65 0.990 0 2016; RZ-16-55 Be-10 Quartz 456412 7864 07KNSTD; # RZ-16-56 0.34121 29.96873 2932 std 4.64 2.65 0.982 0 2016; RZ-16-56 Be-10 Quartz 454357 7829 07KNSTD; # #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: