# Klang Cave, Thailand 2700 Year Stalagmite d18O Data and ITCZ Shift Index #----------------------------------------------------------------------- # 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/28350 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/thailand/klang2019itczsi.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: oxygen isotopes #-------------------- # Contribution_Date # Date: 2019-11-10 #-------------------- # File_Last_Modified_Date # Date: 2019-11-10 #-------------------- # Title # Study_Name: Klang Cave, Thailand 2700 Year Stalagmite d18O Data and ITCZ Shift Index #-------------------- # Investigators # Investigators: Tan, L.; Shen, C.-C.; Löwemark, L.; Chawchai, S.; Edwards, R.L.; Cai, Y.; Breitenbach, S.F.M.; Cheng, H.; Chou, Y.-C.; Duerrast, H.; Partin, J.W.; Cai, W.; Chabangborn, A.; Gao, Y.; Kwiecien, O.; Wu, C.-C.; Shi, Z.; Hsu, H.-H.; Wohlfarth, B. #-------------------- # Description_Notes_and_Keywords # Description: Speleothem oxygen isotope records from Klang Cave, Thailand over the past 2700 years, plus ITCZ Shift Index reconstruction. # Provided Keywords: Speleothem, oxygen isotope, Rainfall, Klang Cave, ITCZ, paleoclimate #-------------------- # Publication # Authors: Liangcheng Tan, Chuan-Chou Shen, Ludvig Löwemark, Sakonvan Chawchai, R. Lawrence Edwards, Yanjun Cai, Sebastian F.M. Breitenbach, Hai Cheng, Yu-Chen Chou, Helmut Duerrast, Judson W. Partin, Wenju Cai, Akkaneewut Chabangborn, Yongli Gao, Ola Kwiecien, Chung-Che Wu, Zhengguo Shi, Huang-Hsiung Hsu, Barbara Wohlfarth # Published_Date_or_Year: 2019-08-27 # Published_Title: Rainfall variations in central Indo-Pacific over the past 2,700 y # Journal_Name: Proceedings of the National Academy of Sciences of the United States of America # Volume: 116 # Edition: # Issue: 35 # Pages: 17201-17206 # Report_Number: # DOI: 10.1073/pnas.1903167116 # Online_Resource: https://www.pnas.org/content/116/35/17201 # Full_Citation: # Abstract: Tropical rainfall variability is closely linked to meridional shifts of the Intertropical Convergence Zone (ITCZ) and zonal movements of the Walker circulation. The characteristics and mechanisms of tropical rainfall variations on centennial to decadal scales are, however, still unclear. Here, we reconstruct a replicated stalagmite-based 2,700-y-long, continuous record of rainfall for the deeply convective northern central Indo-Pacific (NCIP) region. Our record reveals decreasing rainfall in the NCIP over the past 2,700 y, similar to other records from the northern tropics. Notable centennial- to decadal-scale dry climate episodes occurred in both the NCIP and the southern central Indo-Pacific (SCIP) during the 20th century [Current Warm Period (CWP)] and the Medieval Warm Period (MWP), resembling enhanced El Nino-like conditions. Further, we developed a 2,000-y-long ITCZ shift index record that supports an overall southward ITCZ shift in the central Indo-Pacific and indicates southward mean ITCZ positions during the early MWP and the CWP. As a result, the drying trend since the 20th century in the northern tropics is similar to that observed during the past warm period, suggesting that a possible anthropogenic forcing of rainfall remains indistinguishable from natural variability. #------------------ # Funding_Agency # Funding_Agency_Name: National Key Research and Development Program of China # Grant: 2017YFA0603401 #------------------ # Funding_Agency # Funding_Agency_Name: Shaanxi Science Fund for Distinguished Young Scholars # Grant: 2018JC-023 #------------------ # Funding_Agency # Funding_Agency_Name: Youth Innovation Promotion Association of Chinese Academy of Sciences # Grant: 2012295 #------------------ # Funding_Agency # Funding_Agency_Name: Belt and Road project of IEECAS # Grant: #------------------ # Site_Information # Site_Name: Klang Cave # Location: Asia>Southeastern Asia>Thailand # Country: Thailand # Northernmost_Latitude: 8.33 # Southernmost_Latitude: 8.33 # Easternmost_Longitude: 98.73 # Westernmost_Longitude: 98.73 # Elevation: #------------------ # Data_Collection # Collection_Name: Klang2019ITCZSI # Earliest_Year: 1 # Most_Recent_Year: 2004 # Time_Unit: CE # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: # Supplementary Table S1. 230Th dating results. # Sample Depth 238U 232Th 230Th / 232Th d234U* 230Th / 238U 230Th Age (yr) 230Th Age (yr) d234UInitial** 230Th Age (yr BP)*** 230Th Age (yr AD) # Number (mm) (ppb) (ppt) (atomic x10-6) (measured) (activity) (uncorrected) (corrected) (corrected) (corrected ) (corrected ) # TK16 # TK16-1# 2.5 18025 ± 21 105.1 ± 3.4 30537 ± 993 153.2 ±1.3 0.010799 ± 0.000021 1025.7 ± 2.3 1025.6 ± 2.3 154 ±1 963.6 ± 2.3 986.4 ± 2.3 # TK16-2# 6 19215 ± 41 192.6 ± 7.4 18135 ± 698 151.9 ±2.2 0.011027 ± 0.000044 1048.7 ± 4.6 1048.4 ± 4.6 152 ±2 986.4 ± 4.6 963.6 ± 4.6 # TK16-3# 24.5 15908 ± 14 37.3 ± 5.2 82533 ± 11426 152.8 ±1.4 0.011721 ± 0.000021 1114.2 ± 2.4 1114.1 ± 2.4 153 ±1 1052.1 ± 2.4 897.9 ± 2.4 # TK16-4# 64.5 15096 ± 14 43.1 ± 7.7 74501 ± 13372 152.0 ±1.2 0.012899 ± 0.000027 1227.6 ± 2.9 1227.5 ± 2.9 152 ±1 1165.5 ± 2.9 784.5 ± 2.9 # TK16-5# 88.5 16791 ± 16 40.4 ± 6.6 91945 ± 15073 152.6 ±1.3 0.013432 ± 0.000024 1277.9 ± 2.7 1277.9 ± 2.7 153 ±1 1215.9 ± 2.7 734.1 ± 2.7 # TK16-6# 91.5 16954 ± 17 12.0 ± 6.9 316294 ± 183145 155.7 ±1.4 0.013535 ± 0.000027 1284.3 ± 3.1 1284.2 ± 3.1 156 ±1 1222.2 ± 3.1 727.8 ± 3.1 # TK16-7# 100.5 16810 ± 16 27.8 ± 6.0 137203 ± 29714 156.4 ±1.2 0.013776 ± 0.000023 1306.6 ± 2.6 1306.5 ± 2.6 157 ±1 1244.5 ± 2.6 705.5 ± 2.6 # TK16-8# 105.5 14952 ± 15 25.4 ± 6.9 136206 ± 37112 152.8 ±1.4 0.014046 ± 0.000026 1336.4 ± 2.9 1336.4 ± 2.9 153 ±1 1274.4 ± 2.9 675.6 ± 2.9 # TK16-9# 130.5 17128 ± 17 11.6 ± 5.7 358278 ± 177129 154.8 ±1.4 0.014702 ± 0.000025 1396.9 ± 3.0 1396.9 ± 3.0 155 ±1 1334.9 ± 3.0 615.1 ± 3.0 # TK16-10# 143.5 18010 ± 19 27.4 ± 5.3 164269 ± 31932 154.2 ±1.4 0.015180 ± 0.000028 1443.3 ± 3.2 1443.3 ± 3.2 155 ±1 1381.3 ± 3.2 568.7 ± 3.2 # TK16-11# 167.5 14928 ± 14 27.7 ± 6.4 140426 ± 32710 154.3 ±1.5 0.015787 ± 0.000026 1501.3 ± 3.1 1501.2 ± 3.1 155 ±1 1439.2 ± 3.1 510.8 ± 3.1 # TK16-12# 196 16992 ± 17 48.6 ± 6.8 96801 ± 13604 154.8 ±1.3 0.016793 ± 0.000073 1596.9 ± 7.2 1596.8 ± 7.2 156 ±1 1534.8 ± 7.2 415.2 ± 7.2 # TK16-13# 229 12171 ± 12 36.0 ± 6.8 98119 ± 18622 152.3 ±1.3 0.017583 ± 0.000034 1676.2 ± 3.8 1676.2 ± 3.8 153 ±1 1614.2 ± 3.8 335.8 ± 3.8 # TK16-14# 233.5 19075 ± 20 956.3 ± 8.3 5977 ± 53 152.0 ±1.2 0.018172 ± 0.000036 1733.3 ± 3.9 1732.2 ± 4.0 153 ±1 1670.2 ± 4.0 279.8 ± 4.0 # TK16-15# 252.5 12370 ± 13 18.4 ± 5.7 214132 ± 65951 150.5 ±1.3 0.019293 ± 0.000035 1843.4 ± 4.0 1843.4 ± 4.0 151 ±1 1781.4 ± 4.0 168.6 ± 4.0 # TK16-16# 259 18363 ± 25 26.4 ± 6.6 228335 ± 57334 152.9 ±2.3 0.019912 ± 0.000037 1899.1 ± 5.3 1899.1 ± 5.3 154 ±2 1837.1 ± 5.3 112.9 ± 5.3 # TK16-17# 275.5 14715 ± 14 49.6 ± 6.5 99791 ± 13149 152.4 ±1.3 0.020404 ± 0.000035 1947.3 ± 4.0 1947.2 ± 4.0 153 ±1 1885.2 ± 4.0 64.8 ± 4.0 # # TK131 # TK131-1 1.5 21800 ± 82 1535.4 ± 31.3 28 ± 1 70.9 ±2.0 0.000121 ± 0.000005 12.3 ± 0.5 10.4 ± 1.4 71 ±2 -53.6 ± 1.4 2003.6 ± 1.4 # TK131-1a# 5 17360 ± 31 905.8 ± 4.4 41 ± 1 70.9 ±1.7 0.000129 ± 0.000002 13.1 ± 0.2 11.8 ± 0.7 71 ±2 -52.2 ± 0.7 2002.2 ± 0.7 # TK131-2 19 24537 ± 107 60.3 ± 1.4 1685 ± 47 75.4 ±2.3 0.000251 ± 0.000004 25.5 ± 0.4 25.4 ± 0.4 75 ±2 -38.6 ± 0.4 1988.6 ± 0.4 # TK131-3 44 29360 ± 117 21.2 ± 0.9 9163 ± 402 71.4 ±2.0 0.000401 ± 0.000004 40.9 ± 0.4 40.8 ± 0.4 71 ±2 -23.2 ± 0.4 1973.2 ± 0.4 # TK131-4 66 22004 ± 86 48.2 ± 1.2 3885 ± 103 66.9 ±2.1 0.000516 ± 0.000005 52.7 ± 0.6 52.7 ± 0.6 67 ±2 -11.3 ± 0.6 1961.3 ± 0.6 # TK131-5 93 30181 ± 129 32.9 ± 1.3 9659 ± 386 68.7 ±2.4 0.000639 ± 0.000007 65.2 ± 0.7 65.1 ± 0.7 69 ±2 1.1 ± 0.7 1948.9 ± 0.7 # TK131-6 117 27064 ± 123 23.0 ± 1.1 14273 ± 666 73.5 ±2.3 0.000735 ± 0.000006 74.7 ± 0.6 74.7 ± 0.6 74 ±2 10.7 ± 0.6 1939.3 ± 0.6 # TK131-7 140 23706 ± 86 21.8 ± 0.9 15896 ± 697 72.0 ±1.9 0.000888 ± 0.000007 90.3 ± 0.7 90.3 ± 0.7 72 ±2 26.3 ± 0.7 1923.7 ± 0.7 # TK131-8 162 26575 ± 104 11.5 ± 0.9 38099 ± 2927 71.8 ±2.1 0.001001 ± 0.000007 101.8 ± 0.7 101.8 ± 0.7 72 ±2 37.8 ± 0.7 1912.2 ± 0.7 # TK131-9 183 30772 ± 251 55.7 ± 1.5 9897 ± 276 70.2 ±3.9 0.001086 ± 0.000010 110.7 ± 1.1 110.6 ±1.1 70 ±4 46.6 ±1.1 1903.4 ±1.1 # TK131-10 206 27646 ± 246 21.0 ± 0.9 25971 ± 1143 70.6 ±4.0 0.001194 ± 0.000012 121.7 ± 1.3 121.7 ±1.3 71 ±4 57.7 ±1.3 1892.3 ±1.3 # TK131-11 234 40440 ± 492 136.6 ± 3.4 6392 ± 162 76.6 ±5.3 0.001309 ± 0.000017 132.7 ± 1.3 132.6 ±1.9 77 ±5 68.6 ±1.9 1881.4 ±1.9 # TK131-1b# 277 21850 ± 47 20.6 ± 3.5 27228 ± 4623 68.8 ±2.2 0.001555 ± 0.000006 158.8 ± 0.7 158.8 ± 0.7 69 ±2 94.8 ± 0.7 1855.2 ± 0.7 # TK131-13 328 23068 ± 176 11.4 ± 1.0 59253 ± 5016 74.5 ±3.5 0.001777 ± 0.000016 180.4 ± 1.7 180.4 ±1.7 75 ±3 116.4 ±1.7 1833.6 ±1.7 # TK131-14 354 24165 ± 213 16.8 ± 1.1 45134 ± 2928 68.0 ±4.1 0.001897 ± 0.000019 193.9 ± 2.1 193.9 ±2.1 68 ±4 129.9 ±2.1 1820.1 ±2.1 # TK131-15 389 31095 ± 301 13.7 ± 1.0 76787 ± 5874 74.0 ±4.3 0.002053 ± 0.000022 208.7 ± 2.4 208.7 ±2.4 74 ±4 144.7 ±2.4 1805.3 ±2.4 # TK131-16 417 23605 ± 137 16.6 ± 1.1 51355 ± 3328 72.8 ±2.8 0.002191 ± 0.000016 222.9 ± 1.8 222.9 ±1.8 73 ±3 158.9 ±1.8 1791.1 ±1.8 # TK131-17 449 28500 ± 320 17.1 ± 0.9 64283 ± 3319 67.0 ±5.1 0.002343 ± 0.000028 239.7 ± 3.1 239.7 ±3.1 67 ±5 175.7 ±3.1 1774.3 ±3.1 # TK131-18 481 27380 ± 257 106.1 ± 2.5 10604 ± 253 72.2 ±4.5 0.002492 ± 0.000026 253.8 ± 2.8 253.6 ±2.8 72 ±5 189.6 ±2.8 1760.4 ±2.8 # TK131-1c# 505 24452 ± 92 35.6 ± 3.6 30284 ± 3050 75.4 ±3.9 0.002671 ± 0.000012 271.2 ± 1.5 271.2 ± 1.5 75 ±4 207.2 ± 1.5 1742.8 ± 1.5 # # TK133 # TK133-1 2 8003 ± 19 4233.2 ± 85.0 58 ± 2 119.3 ±1.9 0.001854 ± 0.000038 180.7 ± 3.7 167.0 ±10.4 119 ±2 103.0 ±10.4 1847.0 ±10.4 # TK133-2 9 8198 ± 20 2991.4 ± 60.5 108 ± 3 118.9 ±1.9 0.002388 ± 0.000028 232.9 ± 2.7 223.4 ± 7.3 119 ±2 159.4 ± 7.3 1790.6 ± 7.3 # TK133-3 15 8476 ± 22 1309.8 ± 26.4 273 ± 6 123.2 ±2.1 0.002562 ± 0.000028 249.0 ± 3.9 245.0 ± 3.9 123 ±2 181.0 ± 3.9 1769.0 ± 3.9 # TK133-4 23 8421 ± 21 2922.7 ± 58.7 182 ± 4 115.9 ±1.9 0.003830 ± 0.000032 374.9 ± 3.2 365.8 ± 7.2 116 ±2 301.8 ± 7.2 1648.2 ± 7.2 # TK133-5 30 15570 ± 46 1235.4 ± 25.0 1136 ± 24 123.5 ±2.1 0.005469 ± 0.000035 532.0 ± 3.6 530.0 ± 3.8 124 ±2 466.0 ± 3.8 1484.0 ± 3.8 # TK133-6 36 10350 ± 30 1202.1 ± 24.4 793 ± 17 122.6 ±2.1 0.005584 ± 0.000037 543.8 ± 3.8 540.8 ± 4.3 123 ±2 476.8 ± 4.3 1473.2 ± 4.3 # TK133-1B 40.5 9956 ± 25 1282.2 ± 26.7 767 ± 17 113.4 ±1.7 0.005987 ± 0.000050 587.9 ± 5.0 584.5 ± 5.5 114 ±2 516.5 ± 5.5 1433.5 ± 5.5 # TK133-2B 42.5 10367 ± 28 349.5 ± 8.8 2983 ± 78 109.7 ±1.8 0.006099 ± 0.000045 600.9 ± 4.5 600.0 ± 4.6 110 ±2 532.0 ± 4.6 1418.0 ± 4.6 # TK133-3B 45 9579 ± 24 1730.9 ± 35.5 599 ± 13 102.4 ±1.7 0.006570 ± 0.000049 651.7 ± 5.0 646.9 ± 6.0 103 ±2 578.9 ± 6.0 1371.1 ± 6.0 # TK133-4B 48.5 8181 ± 17 569.3 ± 12.4 1631 ± 37 98.2 ±1.5 0.006882 ± 0.000052 685.5 ± 5.3 683.6 ± 5.5 98 ±2 615.6 ± 5.5 1334.4 ± 5.5 # TK133-7 52 7659 ± 16 2295.1 ± 46.2 444 ± 9 98.9 ±1.7 0.008073 ± 0.000038 803.9 ± 4.0 796.0 ± 6.9 99 ±2 732.0 ± 6.9 1218.0 ± 6.9 # TK133-8 63 12583 ± 31 101.9 ± 2.9 17005 ± 489 98.0 ±1.6 0.008348 ± 0.000029 832.1 ± 3.2 831.9 ± 3.2 98 ±2 767.9 ± 3.2 1182.1 ± 3.2 # TK133-5B 67.5 6551 ± 15 3962.9 ± 80.0 255 ± 5 95.9 ±1.7 0.009341 ± 0.000063 933.3 ± 6.5 917.2 ± 13.1 96 ±2 849.2 ± 13.1 1100.8 ± 13.1 # TK133-6B 70.5 7608 ± 17 1044.2 ± 21.6 1178 ± 25 96.9 ±1.7 0.009805 ± 0.000061 979.0 ± 6.3 975.4 ± 6.8 97 ±2 907.4 ± 6.8 1042.6 ± 6.8 # TK133-7B 72.5 8521 ± 20 698.5 ± 15.1 2041 ± 46 97.1 ±1.6 0.010148 ± 0.000061 1013.2 ± 6.3 1011.0 ± 6.5 97 ±2 943.0 ± 6.5 1007.0 ± 6.5 # TK133-8B 76 8882 ± 25 1313.1 ± 27.0 1180 ± 25 98.0 ±1.9 0.010581 ± 0.000055 1055.7 ± 5.8 1051.8 ± 6.4 98 ±2 983.8 ± 6.4 966.2 ± 6.4 # TK133-9 79 11931 ± 31 2272.7 ± 45.8 958 ± 19 97.4 ±1.8 0.011063 ± 0.000039 1104.7 ± 4.4 1099.6 ± 5.6 98 ±2 1035.6 ± 5.6 914.4 ± 5.6 # TK133-10 94 11379 ± 32 1374.7 ± 27.8 1645 ± 33 100.8 ±2.0 0.012053 ± 0.000045 1200.3 ± 5.0 1197.1 ± 5.5 101 ±2 1133.1 ± 5.5 816.9 ± 5.5 # TK133-11 106 9878 ± 19 143.0 ± 4.0 14532 ± 405 99.9 ±1.5 0.012763 ± 0.000042 1272.6 ± 4.6 1272.2 ± 4.6 100 ±1 1208.2 ± 4.6 741.8 ± 4.6 # TK133-12 123 11537 ± 27 536.1 ± 10.9 4940 ± 101 100.6 ±1.6 0.013924 ± 0.000041 1388.2 ± 5.0 1386.9 ± 4.7 101 ±2 1322.9 ± 4.7 627.1 ± 4.7 # TK133-13 141 10957 ± 29 196.1 ± 4.6 14041 ± 331 105.3 ±1.9 0.015238 ± 0.000056 1513.5 ± 6.2 1513.0 ± 6.2 106 ±2 1449.0 ± 6.2 501.0 ± 6.2 # TK133-14 165 11299 ± 27 830.1 ± 16.9 3750 ± 77 100.1 ±1.7 0.016709 ± 0.000052 1668.6 ± 5.9 1666.6 ± 6.0 101 ±2 1602.6 ± 6.0 347.4 ± 6.0 # TK133-15 176 10975 ± 25 961.4 ± 19.7 3376 ± 70 96.5 ±1.7 0.017934 ± 0.000062 1797.8 ± 6.8 1795.5 ± 7.0 97 ±2 1731.5 ± 7.0 218.5 ± 7.0 # TK133-16 190 12860 ± 32 747.2 ± 15.3 5359 ± 110 98.9 ±1.7 0.018884 ± 0.000060 1889.7 ± 6.7 1888.1 ± 6.8 99 ±2 1824.1 ± 6.8 125.9 ± 6.8 # TK133-17 207 15076 ± 42 395.6 ± 8.3 12564 ± 263 99.4 ±1.8 0.019998 ± 0.000063 2001.2 ± 7.2 2000.5 ± 7.2 100 ±2 1936.5 ± 7.2 13.5 ± 7.2 # TK133-18 221 12704 ± 31 474.7 ± 9.8 9398 ± 194 102.0 ±1.7 0.021296 ± 0.000061 2127.4 ± 6.9 2126.4 ± 7.0 103 ±2 2062.4 ± 7.0 -112.4 ± 7.0 # TK133-19 258 12132 ± 30 1319.8 ± 26.6 3397 ± 69 104.7 ±1.7 0.022416 ± 0.000066 2234.9 ± 7.5 2232.0 ± 7.7 105 ±2 2168.0 ± 7.7 -218.0 ± 7.7 # TK133-20 272 13709 ± 37 443.3 ± 9.3 11677 ± 247 105.7 ±1.7 0.022899 ± 0.000072 2281.4 ± 8.1 2280.5 ± 8.1 106 ±2 2216.5 ± 8.1 -266.5 ± 8.1 # TK133-21 278 16338 ± 46 89.7 ± 3.3 70397 ± 2566 106.9 ±1.8 0.023445 ± 0.000079 2333.7 ± 9.0 2333.5 ± 8.8 108 ±2 2269.5 ± 8.8 -319.5 ± 8.8 # TK133-22 298 10369 ± 21 1401.8 ± 4.5 3005 ± 13 103.2 ±2.5 0.024642 ± 0.000090 2462.4 ± 10.6 2459.2 ± 10.8 104 ±2 2395.2 ± 10.8 -445.2 ± 10.8 # TK133-23 302 7375 ± 18 932.7 ± 3.9 3279 ± 16 106.2 ±2.9 0.025151 ± 0.000085 2507.0 ± 10.9 2504.0 ± 11.0 107 ±3 2440.0 ± 11.0 -490.0 ± 11.0 # TK133-24 356 14649 ± 36 60.7 ± 3.2 107754 ± 5620 106.5 ±2.8 0.027066 ± 0.000082 2699.6 ± 10.7 2699.5 ± 10.7 107 ±3 2635.5 ± 10.7 -685.5 ± 10.7 # # Analytical errors are 2s of the mean. # U decay constants: l238 = 1.55125x10-10 (ref. S5) and l234 = 2.82206x10-6 (ref. 61). Th decay constant: l230 = 9.1705x10-6 (ref. 61). # *d234U = ([234U/238U]activity – 1)x1000. ** d234Uinitial was calculated based on 230Th age (T), i.e., d234Uinitial = d234Umeasured x el234xT. # Corrected 230Th ages assume the initial 230Th/232Th atomic ratio of 4.4 ±2.2 x10-6. Those are the values for a material at secular # equilibrium, with the bulk earth 232Th/238U value of 3.8. The errors are arbitrarily assumed to be 50%. # ***B.P. stands for "Before Present" where the "Present" is defined as the year 1950 A.D. # Sample numbers with # were measured at the National Taiwan University, and the others were measured at the Xi'an Jiaotong University. # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## age_CE age, , , year Common Era, , speleothems, , ,N, ## ITCZSI Intertropical Convergence Zone Shift Index, , , , ,climate reconstruction,,,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_CE ITCZSI 1 0.194 2 0.127 3 0.059 4 0.020 5 0.000 6 -0.024 7 -0.054 8 -0.080 9 -0.096 10 -0.112 11 -0.129 12 -0.150 13 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