# Southwest Madagascar Deglacial Speleothem Stable Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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: https://www.ncdc.noaa.gov/paleo/study/25710 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019ad4.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Speleothems # # Dataset DOI: # # Parameter_Keywords: carbon isotopes, oxygen isotopes #--------------------------------------- # Contribution_Date # Date: 2019-02-20 #--------------------------------------- # File_Last_Modified_Date # Date: 2019-02-20 #--------------------------------------- # Title # Study_Name: Southwest Madagascar Deglacial Speleothem Stable Isotope Data #--------------------------------------- # Investigators # Investigators: Scroxton, N.; Burns, S.J.; McGee, D.; Hardt, B.; Godfrey, L.R.; Ranivoharimanana, L.; Faina, P. #--------------------------------------- # Description_Notes_and_Keywords # Description: Speleothem stable isotope (d13C, d18O) data from 2 stalagmites collected in Tsimanampesotse National Park, southwest Madagascar, for the deglacial interval (~22-11 kyrbp). #--------------------------------------- # Publication # Authors: Nick Scroxton, Stephen J. Burns, David McGee, Ben Hardt, Laurie R. Godfrey, Lovasoa Ranivoharimanana, Peterson Faina # Published_Date_or_Year: 2019-01-29 # Published_Title: Competing temperature and atmospheric circulation effects on southwest Madagascan rainfall during the last deglaciation # Journal_Name: Paleoceanography and Paleoclimatology # Volume: # Edition: # Issue: # Pages: # Report Number: # DOI: 10.1029/2018PA003466 # Online_Resource: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018PA003466 # Full_Citation: # Abstract: The global paleomonsoon concept predicts an antiphase response of monsoon rainfall in the northern and southern hemispheres at timescales where there is asymmetric solar forcing and/or asymmetric hemispheric temperature changes. However, as different monsoon systems have different sensitivities to local, regional and global forcing, rainfall response may vary regionally, particularly during large global climatic changes such as the last deglaciation where warming occurred in both hemispheres. Despite its role as a key southern hemisphere counterpart to the Arabian and Indian summer monsoons, the behavior of the summer monsoon in the southern hemisphere of the Indian Ocean during the last deglaciation is unknown. Therefore, we present a new high-resolution, precisely dated, and replicated speleothem stable isotope record from Tsimanampesotse National Park in southwest Madagascar that covers the last deglaciation. We show that speleothem growth phases respond largely to movements of the southern hemisphere summer Hadley circulation (summer extent of the tropical rainbelt/mean Intertropical Convergence Zone location), with some contribution from sea-surface temperature changes at key times, such as during the Bolling-Allerod. In contrast, speleothem d18O responds primarily to sea-surface temperature, in particular the location of the deep atmospheric convection isotherm, while summer Hadley circulation changes take a secondary role. Separating the varying influences of temperature and atmospheric circulation in controlling southwest Madagascan rainfall is critical to understanding rainfall variability in both the past and the future. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: AGS-1702891/1702691, BCS-1750598, EAR-1439559 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: MIT Ferry Fund # Grant: #--------------------------------------- # Site Information # Site_Name: Tsimanampesotse National Park # Location: Ocean>Indian Ocean>Madagascar # Country: Madagascar # Northernmost_Latitude: -24.048 # Southernmost_Latitude: -24.048 # Easternmost_Longitude: 43.753 # Westernmost_Longitude: 43.753 # Elevation: 20 m #--------------------------------------- # Data_Collection # Collection_Name: TsimanampesotseAD4 # First_Year: 19136 # Last_Year: 15421 # Time_Unit: cal. yr BP # Core_Length: 1.6184 m # Notes: #--------------------------------------- # Chronology_Information # Chronology: # # Decay constants for 230Th and 234U are from Cheng et al. (2013); decay constant for 238U is from Jaffey et al. (1971). # * dates not used in age model construction. At 813.7mm the isochron age of 14,130 yr BP with error of 87 (average of +88 and -86) is used. # a Reported errors for 238U and 232Th concentrations are estimated to be ±1% due to uncertainties in spike concentration; analytical uncertainties are smaller. # b d234U = ([234U/238U]activity - 1) x 1000. # c "Uncorrected" indicates that no correction has been made for initial 230Th. # d Ages are corrected for detrital 230Th assuming an initial 230Th/232Th of (3±1.5) x 10-6 determined from the isochron. # e d234Uinitial corrected was calculated based on 230Th age (T), i.e., d234Uinitial = d234Umeasured × el234*T, where T is corrected age. # # Sample ID # Depth (mm) # 238U (ng/g)a # ±2s 2 sigma confidence # 232Th (pg/g)a # ±2s 2 sigma confidence # d234U (per mil)b # ±2s 2 sigma confidence # 230Th/238U (activity) # ±2s 2 sigma confidence # 230Th/232Th (ppm atomic) # ±2s 2 sigma confidence # Uncorr. Age (yr) # ±2s 2 sigma confidence # d234U initial (per mil)e # ±2s 2 sigma confidence # Corr. Age (yr BP) # ±2s 2 sigma confidence # # Sample ID Depth 238U ±2s 232Th ±2s d234U ±2s 230Th/238U ±2s 230Th/232Th ±2s Uncorr. Age ±2s d234U initial ±2s Corr. Age ±2s # # MT1-15 15 159.4 3.2 1959 39 -141.5 1.6 0.08986 0.00059 116.12 0.69 12092 88 -146.3 1.7 11730 170 # MT1-155 155 145 2.9 602 13 -142.21 0.98 0.09334 0.0005 357 3 12602 74 -147.3 1 12434 89 # MT1-303 303 131.5 2.6 795 17 -141 1.8 0.0976 0.0014 256.2 4.1 13190 210 -146.3 1.9 12980 220 # MT1-565 563.5 258.5 5.2 536 12 -142.6 1.4 0.09812 0.00052 751.9 9.3 13297 79 -148 1.5 13180 83 # MT1-598 597.8 280.6 5.6 1185 24 -136.5 1.3 0.10309 0.00047 387.8 1.8 13910 72 -141.9 1.4 13742 88 # MT1-814A* 813.7 260.5 5.2 1111 23 -141.35 0.98 0.10524 0.00043 391.8 2.3 14309 65 -147.1 1 14139 83 # MT1-814L1* 813.7 282 5.6 592 12 -143 1 0.10445 0.0003 790.6 5.6 14224 47 -148.9 1.1 14106 54 # MT1-814L2* 813.7 292.4 5.8 15730 320 -143.1 1.3 0.11401 0.00091 33.64 0.27 15630 140 -149 1.4 14250 670 # MT1-814R1* 813.7 266.5 5.3 983 20 -140.1 1 0.10546 0.0005 453.9 3.1 14317 75 -145.8 1.1 14161 87 # MT1-951 950 141.9 2.8 789 16 -139 1.7 0.10881 0.00061 310.9 2.2 14785 94 -144.9 1.7 14590 120 # MT1-1061 1061.1 140 2.8 320.1 6.9 -135 1.2 0.11119 0.00062 772.3 7.4 15056 93 -140.8 1.2 14933 97 # MT1-1088 1087.9 131.7 2.6 1082 22 -23.8 1.1 0.133 0.0011 256.9 2.3 15980 150 -24.9 1.2 15740 170 # MT1-1150 1150 134.6 2.7 283.7 5.8 -137.5 2.3 0.11641 0.00048 876.8 4.4 15872 85 -143.8 2.5 15733 93 # MT1-1259 1179.3 180 3.6 1215 25 -131.24 0.94 0.12099 0.00053 284.6 1.7 16414 80 -137.4 0.98 16190 110 # MT1-1192 1196 133.1 2.7 88.7 3 -131.6 1.7 0.11996 0.0006 2858 81 16271 95 -137.7 1.8 16188 95 # MT1-1219 1222.7 128.6 2.6 3196 64 -136.1 1.4 0.12739 0.00072 81.41 0.48 17470 110 -142.7 1.5 16800 320 # MT1-1242 1245.5 231.2 4.6 769 16 -134.85 0.84 0.12477 0.00058 595.5 3.4 17051 88 -141.47 0.88 16903 97 # MT1-1270 1273.1 350.1 7 8470 170 -138.96 0.73 0.1331 0.00059 87.31 0.45 18394 91 -146.13 0.78 17740 310 # MT1-1300 1300 157.3 3.1 701 14 -141.7 2.5 0.12746 0.00053 454.3 1.9 17607 97 -148.8 2.6 17380 130 # MT1-1388 1308.3 428 8.6 19670 390 -142.34 0.78 0.14609 0.00079 50.48 0.27 20470 120 -150.33 0.86 19280 580 # MT1-1385 1385 197.6 4 1498 30 -142.9 2.6 0.1363 0.00051 285.52 0.98 18980 100 -150.7 2.8 18640 170 # MT1-1430 1439.5 163.3 3.3 4852 98 -138.8 1 0.14318 0.00081 76.49 0.44 19930 130 -146.6 1.1 19140 380 # MT1-1473 1473 174.9 3.5 2837 57 -142.6 2.2 0.14135 0.00066 138.34 0.63 19740 120 -150.5 2.3 19100 310 # MT1-1560 1482.5 235.3 4.7 13550 270 -140.1 1.6 0.1626 0.001 44.84 0.27 23000 170 -148.9 1.7 21530 730 # MT1-1667 1589.5 181.7 3.6 6290 130 -137 1.4 0.16133 0.00066 74.05 0.24 22690 110 -145.8 1.5 21790 440 # MT1-1602 1602 171.2 3.4 7310 150 -137.9 2.5 0.1675 0.001 62.27 0.36 23700 180 -146.8 2.7 22110 790 # MT1-1693* 1613.4 179.6 3.6 25600 520 -135.46 0.92 0.2276 0.0019 25.36 0.22 33610 340 -147.5 1.3 30000 1800 # MT1-1617 1617.3 182.8 3.7 14250 290 -136.1 2.2 0.1742 0.002 35.48 0.41 24700 330 -145.1 2.4 22700 1000 # AD4-24 20.5 88.9 1.8 204.3 4.2 -107.5 1.4 0.11931 0.00095 824.3 7 15690 140 -112.4 1.4 15550 140 # AD4-74 74 64.8 1.3 85 2.2 -107.1 2.9 0.12468 0.00084 1508 26 16450 130 -112.1 3 16350 130 # AD4-116 113.5 58.3 1.2 76.7 1.7 -134 2.3 0.12374 0.00087 1494 18 16880 140 -140.5 2.5 16770 140 # AD4-170 168 55.5 1.1 119.5 2.5 -137.4 2.6 0.12848 0.00069 948.1 8.1 17660 120 -144.4 2.8 17520 130 # AD4-207 201.5 49.34 0.99 84.1 2.1 -126.4 2.4 0.1295 0.0011 1205 21 17560 170 -132.8 2.5 17450 170 # AD4-236 234.5 112.9 2.3 285.3 5.8 -142.4 2.9 0.13521 0.0009 849.9 6.1 18800 150 -150.1 3.1 18640 160 # AD4-295 301.5 143.4 2.9 705 14 -144.4 2.3 0.13746 0.00055 443.7 1.7 19190 100 -152.4 2.5 18950 140 # AD4-312 311.5 110.2 2.2 423.9 8.6 -146.9 2.3 0.13832 0.00078 571.1 3.8 19390 130 -155.1 2.4 19230 140 # #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## depth_mm depth, , , mm, , , , ,N,depth measured from top ## age_calBP age, , , calendar years before present, , , , multiple collector inductively-coupled plasma mass spectrometry,N,present defined as 1950 CE ## age_calBPerr age error, , two standard error, years, , , , multiple collector inductively-coupled plasma mass spectrometry,N,present defined as 1950 CE ## d13C delta 13C,calcite,,per mil VPDB,,speleothems,,isotope ratio mass spectrometry,N, ## d18O delta 18O,calcite,,per mil VPDB,,speleothems,,isotope ratio mass spectrometry,N, # #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NaN depth_mm age_calBP age_calBPerr d13C d18O 1.5 15421.9 219.4 -2.72 -3.04 4.5 15454.9 207.1 -5.45 -3.74 7.5 15487.9 194.7 -3.32 -3.29 10 15515.5 184.5 -4.89 -3.7 12.5 15543 173.1 0.58 -1.16 15.5 15576 160.2 -2.78 -1.68 18.5 15609.1 145.3 -0.68 -1.62 21.5 15644 138.1 -5.5 -3.35 24.5 15682.8 143.7 -4.38 -3.05 27.5 15721.8 149.6 -4.91 -2.99 30.5 15760.6 153.9 -5.78 -3.32 33.5 15799.4 158.5 -4.91 -2.39 36.5 15838.3 160 -4.31 -2.57 39.5 15877.1 161.6 -0.04 -1.33 42.5 15915.9 162.4 0.25 -1.64 45.5 15954.8 163.1 0.64 -1.71 48.5 15993.5 162.2 4.24 0.34 51.5 16032.3 158.8 2.59 0.43 54.5 16071.2 155.4 2.43 -0.04 57.5 16110.1 150.8 2.32 -0.34 60.5 16149 146.7 2.87 -0.3 63.5 16187.7 138.6 3.81 0.2 66.5 16226.6 130.3 -0.31 -1.59 69.5 16265.5 120.3 -0.97 -1.35 72.5 16304.3 109.5 -2.87 -2.52 75.5 16340.7 106.7 -2.17 -2.9 78.5 16374.7 111.9 -2.24 -2.02 81.5 16408.6 116.2 -2.97 -2.56 84.5 16442.5 120.4 -4.05 -2.61 87.5 16476.5 122.5 -5.92 -3.57 90.5 16510.4 124.3 -6.42 -3.92 93.5 16544.4 126.3 -6.06 -4.16 96.5 16578.4 124.7 -3.01 -2.68 99.5 16612.2 123.1 -2.27 -2.9 102.5 16646.1 121 -2.94 -2.74 105.5 16679.9 117.5 -1.82 -2.72 108.5 16713.8 113.3 -0.99 -1.78 111.5 16747.7 108.1 -4.08 -2.94 114.5 16781.7 107.1 -2.9 -2.84 117.5 16815.9 114 -2.62 -2.54 120.5 16850 121 -1.4 -1.82 123.5 16884.2 126.1 -2.79 -3.04 126.5 16918.3 131.5 -2.04 -2.76 129.5 16952.4 134.2 -1.53 -2.37 132.5 16986.5 136.7 -1.75 -2.44 135.5 17020.8 138.6 -1.94 -2.62 138.5 17054.8 140.2 -2.53 -2.95 141.5 17089 141.1 -1.51 -2.63 144.5 17123.1 139 -1.07 -2.2 147.5 17157.2 137.4 -1.34 -1.98 150.5 17191.4 134.3 -0.93 -2.22 153.5 17225.5 131.5 -1.92 -2.42 156.5 17259.6 126.4 -1.99 -2.69 159.5 17293.6 120.6 -1.58 -2.52 161.5 17316.4 116.9 -0.37 -1.94 162.75 17330.6 113.5 -3.18 -2.77 165 17356.2 108 -2.56 -3.04 168 17390.3 100.5 -2.31 -2.72 171 17412 101.8 -2.94 -2.82 174 17433.7 103.6 -2.08 -2.51 177 17455.4 105.8 -1.64 -2.81 180 17477.1 108 -1.3 -2.9 183 17498.9 110.5 -2.66 -3.34 186 17520.6 113.2 -3.65 -3.31 189 17542.4 115.7 -3.81 -3.52 192 17564.1 118.4 -4.33 -3.61 195 17585.8 121.3 -4.09 -3.69 198 17607.6 124.4 -4.36 -3.97 201 17629.3 127.8 -2.85 -3.61 204 17660.2 140.9 -2.28 -2.67 207 18462.7 286.5 -1.3 -3.22 210 18483.8 272.4 -1.54 -2.63 213 18505 258.7 -2.46 -2.76 216 18526.3 244.7 -1.82 -3.11 219 18547.4 231.5 -2.36 -3.26 222 18568.5 216.8 -2.98 -3.15 225 18589.7 202.5 -2.77 -3.47 228 18610.7 189.3 -2.75 -3.4 231 18632 174.5 -3.61 -3.29 234 18653.2 160.6 -2.75 -2.96 237 18671.2 154.7 -2.96 -3.27 240 18688.6 150.8 -2.54 -3.14 243 18705.9 147.2 -1.71 -2.98 246 18723.3 143.4 -2.33 -2.86 249 18740.6 139.9 -1.11 -2.41 252 18757.9 136.7 -2.45 -2.74 254.5 18772.4 133.5 -1.02 -1.97 257 18786.8 130.6 -1.39 -2.43 260 18804.2 127.5 -2.14 -3.19 263 18821.5 124.2 -2.03 -2.92 266 18838.8 121.3 -2 -2.8 269 18856.2 118.5 0.63 -2.43 272 18873.6 115.2 -0.84 -1.87 275 18891 112.3 -3.71 -3.11 278 18908.3 109.5 -2.81 -2.56 281 18925.6 107 -3.85 -2.85 284 18943 105 -4.09 -3.63 287 18960.4 102.4 -1.08 -2.74 290 18977.7 100.2 -1.27 -2.62 293 18995.1 98.6 -1.14 -2.47 296 19012.4 96.8 -1.49 -2.26 299 19029.8 95.5 0.77 -2.38 302 19047.9 95.8 -4.23 -3.36 305 19070.4 99.9 -3.12 -3.25 308 19092.8 104.6 -1.22 -2.22 311 19115.2 109.9 -2.05 -2.82 314 19136.9 125.1 -2.11 -2.95