#----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # 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: hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:14129 # Online_Resource: ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/indonesia/lading2013.txt # Online_Resource: ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/indonesia/lading2013.xls # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleolimnology #-------------------- # Contribution_Date # Date: 2013-03-11 #-------------------- # Title # Study_Name: Intensification of southwestern Indonesian rainfall over the past millennium. #-------------------- # Investigators # Investigators: Konecky, B. L.; Russell, J. M.; Rodysill, J. R.; Vuille, M.; Bijaksana, S.; Huang, Y. #-------------------- # Description_and_Notes # Description: # Samples for dDwax analysis were taken at an average resolution of 8.5years (ranging approximately 3 to 25years). One hundred seventy sediment samples were freeze-dried, homogenized, and extracted using a Dionex Accelerated Solvent Extractor 350 to yield the soluble lipid fraction. Fatty acids were then purified according to previously described methods [Konecky et al., 2011]. dD was measured on the C28 n-alkanoic acid, the dominant homologue in all samples, using gas chromatography- pyrolysis-isotope ratio-mass spectrometry. Samples were randomized and run in duplicate, except for a subset of 18 samples that were run in triplicate. The pooled standard deviation of triplicate samples was 1.08%, and the 1-s error on a synthetic fatty acid methyl ester standard run between every six replicates was 2.5%. dDwax values are reported relative to Vienna Standard Mean Ocean Water. # Leaf wax delta-D(C28 n-alkanoic acid) from Lake Lading, East Java, Indonesia. # ADDITIONAL REFERENCE FOR FATTY ACID PURIFICATION: # Konecky, B. L., Russell, J. M., Johnson, T. C., Brown, E. T., Berke, M. A., Werne, J. P., & Huang, Y. (2011). Atmospheric circulation patterns during late Pleistocene climate changes at Lake Malawi, Africa. Earth and Planetary Science Letters, 312(3), 318�326. #-------------------- # Publication # Authors: Konecky, B. L., J. M. Russell, J. R. Rodysill, M. Vuille, S. Bijaksana, and Y. Huang # Published_Date_or_Year: 2013 # Published_Title: Intensification of southwestern Indonesian rainfall over the past millennium # Journal_Name: Geophysical Research Letters # Volume: 40 # Edition: # Issue: # Pages: 386-391 # Report_Number: # DOI: 10.1029/2012GL054331 # Publication_Place: # Publisher: # ISBN: # Online_Resource: # Other_Reference_Details: # Full_Citation: # Abstract: Modern precipitation in Indonesia is strongly correlated to variations in the Asian/Australasian monsoons, the Walker circulation, and migrations of the Intertropical Convergence Zone (ITCZ), but controls on multi-decadal to millennial rainfall variations are less clear. We present a new, high-resolution, precipitation proxy reconstruction from Lake Lading (8S, 113E), Java, from 850 C.E. to present, based on the dD of terrestrial plant waxes. We find that rainfall has steadily increased in Java over the past millennium. This increase persists into the 20th century, despite evidence from other tropical proxy records for a northward ITCZ migration during the last two centuries, which should introduce drier conditions to Java. Aspects of this long-term increase in rainfall resemble records from the northern hemisphere, tropical Indo-Pacific, suggesting that strengthening Walker circulation played an important role in this long-term increase in rainfall and decrease in the dD of precipitation, while ITCZ variations may have been important to climate variations on multi-decadal to centennial timescales. #-------------------- # Publication # Authors: Konecky, Bronwen L.; Russell, James M.; Johnson, Thomas C.; Brown, Erik T.; Berke, Melissa A.; Werne, Josef P.; Huang, Yongsong # Published_Date_or_Year: 2011 # Published_Title: Atmospheric circulation patterns during late Pleistocene climate changes at Lake Malawi, Africa. # Journal_Name: Earth and Planetary Science Letters # Volume: 312 # Edition: # Issue: 3-4 # Pages: 318-326 # Report_Number: # DOI: 10.1016/j.epsl.2011.10.020 # Publication_Place: # Publisher: # ISBN: # Online_Resource: # Other_Reference_Details: # Full_Citation: # Abstract: The climate of tropical Africa transitioned from an interval of pronounced, orbitally-paced megadroughts to more humid and stable conditions approximately 70,000 years ago (Scholz et al., 2007). The regional atmospheric circulation patterns that accompanied these climatic changes, however, are unclear due to a paucity of continental paleoclimate records from tropical Africa extending into the last interglacial. We present a new 140-kyr record of the deuterium/hydrogen isotopic ratio of terrestrial leaf waxes (dDwax) from drill cores from Lake Malawi, southeast Africa, that spans this important climatic transition. dDwax shifts from highly variable and relatively D-depleted to more stable and D-enriched around 56 ka, contemporary with the onset of more humid conditions in the region. Moisture source and transport history dominate the dDwax signal at Lake Malawi, with local rainfall amount playing a secondary role for much of the paleorecord. Analysis of modern moisture sources for Lake Malawi suggests that D-depletion of waxes during the megadroughts may have been caused by an enhanced contribution of the drier, D-depleted air mass currently located in central southern Africa to the Lake Malawi catchment. This D-depleted air mass is associated with the descending limb of the Hadley cell, which implies significant changes in the Hadley circulation during the megadroughts and related changes in the position of the Intertropical Convergence Zone over Africa. These findings demonstrate the ability of dDwax to serve as an atmospheric tracer when used in conjunction with additional proxy records for moisture balance, and elucidate potential mechanisms for pronounced hydrological change in southeast Africa during the late Pleistocene. #------------------ # Funding_Agency # Funding_Agency_Name: National Science Foundation(USA) # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: National Science Foundation(USA) # Grant: #------------------ # Site_Information # Site_Name: Lake Lading # Location: Ocean>Indian Ocean>Indonesia>Jawa Timur # Region: # Country: Indonesia # Northernmost_Latitude: -8.008817 # Southernmost_Latitude: -8.008817 # Easternmost_Longitude: 113.312 # Westernmost_Longitude: 113.312 # Elevation: 324 #------------------ # Data_Collection # Collection_Name: Lading # Earliest_Year: 851.9 # Most_Recent_Year: 2002.2 # Time_Unit: AD # Core_Length: # Notes: #------------------ # Species: #------------------ # Chronology: #---------------- # Variables # Short_name What,Material,Error,Units, Seasonality,Archive,Details,Method,Data_type # ## depth_cm Depth,,,cm,,,,,N ## age_AD Age,,,years AD,,,,,N ## dDleafwax deltaD,dDleafwax-lowpass,,per mil VSMOW,,Paleolimnology,,,N ## dDleafwax-lowpass deltaD,dDleafwax-lowpass,,per mil VSMOW,low-pass filtered,Paleolimnology,,,N #---------------- # Data # Missing_Values: depth_cm age_AD dDleafwax dDleafwax-lowpass 12.0 2000.2 -153.654 -153.6363946 17.0 1995.5 -153.996 -153.834106 22.0 1990.8 -154.1285 -153.6456404 27.0 1986 -155.179 -152.9354884 32.5 1980.8 -149.389 -152.3913825 37.0 1976.4 -151.12 -152.0392864 41.2 1972.4 -152.577 -151.9302914 47.0 1966.7 -151.128 -151.9530026 52.0 1961.8 -152.213 -151.9236311 57.0 1956.7 -153.53 -151.7267406 62.0 1951.6 -152.223 -151.4075143 66.8 1946.6 -151.944 -151.1442473 72.0 1941.1 -148.904 -151.1090746 77.5 1935 -148.757 -151.3057102 83.3 1928.4 -152.811 -151.5000721 87.5 1923.5 -149.823 -151.3096272 93.0 1916.8 -153.891 -150.4169857 98.0 1910.6 -148.974 -148.7858221 102.0 1905.4 -150.233 -146.7418868 104 1902.8 -140.701 -144.853706 106.5 1899.5 -139.647 -143.6648594 112.0 1892.1 -144.563 -143.4197948 114.5 1888.6 -144.674 -143.9322207 117.0 1885.1 -149.703 -144.6668562 121.8 1878.2 -143.548 -144.9920113 124.5 1874.2 -144.027 -144.4784021 126.5 1871.2 -138.1 -143.1075504 131.8 1863.1 -142.489 -141.3041541 137.0 1855 -144.748 -139.784259 139.5 1851 -137.077 -139.2787734 141.8 1847.2 -140.785 -140.2321332 144 1843.6 -141.817 -142.5857285 147.0 1838.6 -144.51 -145.7346319 150 1833.5 -148.891 -148.6934756 152.8 1828.7 -150.702 -150.4308481 156.3 1822.5 -150.356 -150.2560225 161.5 1813.2 -148.798 -148.103316 164 1808.6 -145.58 -144.5859891 166.5 1804 -143.415 -140.7823902 169.5 1798.3 -132.262 -137.8351537 171.5 1794.5 -136.381 -136.5317804 173.5 1790.6 -135.13 -137.0441647 176.4 1784.9 -143.794 -138.9277758 181.6 1774.6 -142.889 -141.3583066 187.4 1762.7 -143.609 -143.4802468 192.4 1752.1 -140.353 -144.7092101 197.4 1741.4 -144.098 -144.8751819 202.4 1730.4 -145.703 -144.1816461 212.4 1707.8 -146.373 -143.0359083 217.4 1696.2 -140.563 -141.8454534 222.4 1684.3 -138.073 -140.8685548 227.4 1672.3 -141.593 -140.16868 232.4 1660.2 -139.657 -139.6711649 237.4 1647.8 -137.487 -139.2757201 241.0 1638.8 -142.022 -138.9561178 246.0 1626.2 -141.743 -138.789711 250.7 1614.2 -133.419 -138.9014643 272.3 1588.8 -139.638 -139.3593016 277.3 1575.6 -140.269 -140.0894283 282.3 1562.3 -141.523 -140.8705018 287.3 1549 -141.392 -141.41806 292.3 1535.5 -143.662 -141.5146117 296.9 1523 -139.517 -141.1118748 302.3 1508.2 -140.697 -140.3479559 306.0 1498 -138.604 -139.4725889 312.3 1480.7 -137.933 -138.7257126 317.3 1466.8 -139.303 -138.237092 322.3 1452.8 -139.191 -137.9961089 325 1445.3 -132.63 -137.8957232 327.3 1438.9 -145.999 -137.8123804 330 1431.3 -134.783 -137.6696261 332.3 1424.8 -136.245 -137.4532024 335.25 1416.6 -134.844 -137.1830247 337.3 1410.8 -139.032 -136.8757216 340 1403.2 -136.057 -136.5317387 342.3 1396.8 -137.647 -136.1560451 343.85 1392.4 -136.875 -135.792225 345.6 1387.5 -134.468 -135.538391 348.1 1380.5 -132.889 -135.5263158 350.9 1372.7 -136.302 -135.8699802 353.6 1365.1 -137.642 -136.6075317 355.9 1358.7 -138.343 -137.6621002 358.6 1351.2 -142.374 -138.8370994 360.9 1344.8 -136.333 -139.8510815 363.6 1337.3 -136.882 -140.4095108 366.1 1330.4 -140.029 -140.3007936 372.4 1313.1 -144.14 -139.4880815 376.1 1303.1 -141.533 -138.1553777 378.6 1296.3 -132.632 -136.6729343 380.9 1290.1 -133.94 -135.4799679 386.1 1276.1 -133.221 -134.9272524 390.9 1263.2 -135.932 -135.1487204 396.1 1249.3 -141.166 -136.0197217 400.9 1236.6 -136.57 -137.2164682 403.6 1229.4 -132.439 -138.3437841 406.1 1222.7 -142.712 -139.0729234 410.9 1210 -138.398 -139.23621 416.1 1196.1 -139.452 -138.4640483 420.9 1183.3 -135.036 -137.1335624 426.1 1169.4 -135.76 -136.216607 430.9 1156.5 -136.515 -135.4460318 435.8 1143.3 -134.404 -134.8564857 440.8 1129.7 -135.811 -134.42154 445.8 1116.1 -133.997 -134.0874146 450.8 1102.3 -133.779 -133.7957697 455.3 1089.9 -131.071 -133.4908087 456.6 1086.3 -133.366 -133.1213566 461.3 1073.3 -135.886 -132.6517285 463.3 1067.7 -130.256 -132.084334 467.3 1056.6 -131.793 -131.4813651 468.6 1053 -129.318 -130.9651587 470.8 1046.8 -131.575 -130.6836734 473.6 1039 -132.687 -130.7461977 475.8 1032.8 -130.836 -131.1552353 478.6 1024.9 -130.6335 -132.0581392 480.8 1018.7 -132.58 -132.6045374 483.6 1010.8 -136.437 -132.3948004 485.8 1004.6 -129.367 -131.7691899 488.6 996.7 -131.637 -131.0055899 490.8 990.5 -128.759 -130.508931 493.6 982.5 -133.545 -130.637917 496.3 974.9 -130.032 -131.5331024 501.6 959.8 -130.29 -133.0312375 503.55 954.2 -137.191 -134.7134823 540.3 930.1 -135.72 -136.070594 542.3 924.4 -138.464 -136.709826 544.6 917.8 -136.171 -136.5074954 547.3 910.1 -134.389 -135.6396531 549.3 904.4 -134.672 -134.4854155 552.3 895.8 -131.754 -133.4590159 554.6 889.2 -136.372 -132.8548697 557.3 881.5 -128.294 -132.7726624 559.3 875.7 -137.354 -133.1404088 562.05 867.9 -133.43 -133.8020981 565.55 857.8 -132.632 -134.6101927 567.6 851.9 -135.454 -135.4724536