# Diva de Maura Cave, Brazil 2700 Year Stalagmite Oxygen Isotope Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original reference when using these data, # plus the Online Resource and date accessed. # # # Online_Resource: http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:13670 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/diva2012.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Speleothems #-------------------- # Contribution_Date # Date: 2012-12-26 #-------------------- # Title # Study_Name: Diva de Maura Cave, Brazil 2700 Year Stalagmite Oxygen Isotope Data #-------------------- # Investigators # Investigators: Novello, V.F.; Cruz, F.W.; Karmann, I.; Burns, S.J.; Stríkis, N.M.; Vuille, M.; Cheng, H.; Edwards, R.L.; Santos, R.V.; Frigo, E.; Barreto, E.A.S. #-------------------- # Description_and_Notes # # Stalagmite oxygen isotope (d18O) collected in the Diva de Maura, Torrinha and Lapa Doce cave systems, located near Iraquara City in Bahia State, in the southern portion of the Nordeste region of Brazil. # The DV2 sample is a 25-cm-long stalagmite collected in Diva Cave which grew continuously during most of the last 2850 years except for the last century. # The missing modern portion of the DV2 isotope record is complemented with the stalagmites TR5 and LD12 (12°20’S, 41°36’W) that cover the last 130 years. # #-------------------- # Publication # Authors: Valdir F. Novello, Francisco W. Cruz, Ivo Karmann, Stephen J. Burns, Nicolás M. Stríkis, Mathias Vuille, Hai Cheng, R. Lawrence Edwards, Roberto V. Santos, Everton Frigo, and Eline A.S. Barreto # Published_Date_or_YEAR: 2012-12-12 # Published_Title: Multidecadal climate variability in Brazil's Nordeste during the last 3000 years based on speleothem isotope records # Journal_Name: Geophysical Research Letters # Volume: 39 # Issue: L23706 # Pages: # DOI: 10.1029/2012GL053936 # Abstract: We present the first high resolution, approximately ~4 years sample spacing, precipitation record from northeastern Brazil (hereafter referred to as 'Nordeste') covering the last ~3000 yrs from 230Th-dated stalagmites oxygen isotope records. Our record shows abrupt fluctuations in rainfall tied to variations in the intensity of the South American summer monsoon (SASM), including the periods corresponding to the Little Ice Age (LIA), the Medieval Climate Anomaly (MCA) and an event around 2800 yr B.P. Unlike other monsoon records in southern tropical South America, dry conditions prevailed during the LIA in the Nordeste. Our record suggests that the region is currently undergoing drought conditions that are unprecedented over the past 3 millennia, rivaled only by the LIA period. Using spectral, wavelet and cross-wavelet analyses we show that changes in SASM activity in the region are mainly associated with variations of the Atlantic Multidecadal Oscillation (AMO) and to a lesser degree caused by fluctuations in tropical Pacific SST. Our record also shows a distinct periodicity around 210 years, which has been linked to solar variability. # #--------------------- # Funding_Agency # Funding_Agency_Name: Fundação de Amparo a Pesquisa do Estado de São Paulo # Grant: 2006/06761-0 and 2011/ 39450394 #--------------------- # Funding_Agency_Name: US National Science Foundation # Grant: 0502535, 3961103404, 1003690 #-------------------- # Site_Information # Site_Name: Diva de Maura Cave # Location: South America>Brazil # Country: Brazil # Northernmost_Latitude: -12.3667 # Southernmost_Latitude: -12.3667 # Easternmost_Longitude: -41.5667 # Westernmost_Longitude: -41.5667 # Elevation: 680 m #------------------ # Data_Collection # Core_Name: DV2 # First_Year: -815 # Last_Year: 1911 # Time_Unit: AD # Core_Length: # Notes: #------------------ # Chronology # # Suplemment Table 1: U/Th ages. # # SampleID Depth(mm) 238U(ppb) ± 232Th(ppt) ± 230Th/232Th(atomic x10-6) ± d234U(measured)* ± 230Th/238U(activity) ± 230ThAge(yr, uncorrected) ± 230ThAge(yr, corrected) ± d234U initial(corrected)** ± # DV2-0 0 11495 ±113 555 ±12 1071 ±26 2407 ±12 0.0031 ±0.0000 101 ±1 100 ±1 2408 ±12 # DV2-5 5.8 9792 ±58 421 ±9 1639 ±36 2139 ±7 0.0043 ±0.0000 149 ±1 148 ±1 2140 ±7 # DV2-1-1 9 11362 ±27.1 171 ±8 7677 ±377 2180 ±3.1 0.00698 ±0.00005 240 ±2 240 ±2 2181 ±3.1 # DV2-11 11.2 19783 ±110 447 ±10 9173 ±202 2459 ±8 0.0126 ±0.0001 396 ±3 396 ±3 2462 ±8 # DV2-2 14 4780 ±12.3 110 ±5 10088 ±501 2351 ±3.4 0.01405 ±0.00011 458 ±4 457 ±4 2354 ±3.4 # DV2-17 17.8 14326 ±78 487 ±10 7575 ±165 2397 ±8 0.0156 ±0.0001 502 ±4 502 ±4 2400 ±8 # DV2-2-1 25.2 43113 ±291 739 ±8 20060 ±216 2390 ±12 0.02084 ±0.00016 673 ±6 673 ±6 2395 ±12 # DV2-3 35.8 10133 ±41.8 42 ±6 108970 ±152 2533 ±5.4 0.02754 ±0.00015 852 ±5 852 ±5 2539 ±5.4 # DV2-3-1 48.6 18426 ±46.4 93 ±5 113635 ±671 2351 ±4.8 0.03472 ±0.00014 1136 ±5 1136 ±5 2359 ±4.9 # DV2-4 62.4 7189 ±24.8 67 ±5 75385 ±601 2445 ±4.5 0.04253 ±0.00021 1352 ±7 1352 ±7 2454 ±4.5 # DV2-4-1 76 16447 ±98.5 148 ±7 93968 ±414 2130 ±10 0.05125 ±0.00034 1800 ±13 1800 ±13 2140 ±10.7 # DV2-5 90.4 8711 ±41.6 100 ±4 96021 ±428 2360 ±6 0.06666 ±0.00037 2179 ±13 2178 ±13 2375 ±6.0 # DV2-5-1 108 10828 ±23.8 135 ±8 117840 ±713 2486 ±5 0.08918 ±0.00032 2822 ±11 2822 ±11 2506 ±5.5 # # TR5-1 2 14941 ±208 128 ±3 671 ±23 2137 ±16 0.0003 ±0.0000 12 ±0 12 ±0.3 2137 ±16 # TR5-3 3.9 22415 ±224 107 ±2 1989 ±50 2169 ±12 0.0006 ±0.0000 20 ±0 20 ±0.29 2169 ±12 # TR5-6 6.2 27709 ±142 174 ±4 1801 ±46 2176 ±7 0.0007 ±0.0000 23 ±0 23 ±0.25 2176 ±7 # TR5-8 8.3 26948 ±233 138 ±4 2510 ±79 2196 ±10.2 0.0008 ±0.0000 27 ±0 27 ±0.4 2196 ±10 # TR5-12 11.1 31407 ±137 115 ±4 4121 ±133 2206 ±6 0.0009 ±0.0000 31 ±0 31 ±0.30 2206 ±6 # TR5-15 16 31885 ±193 79 ±3 7291 ±260 2191 ±8 0.0011 ±0.0000 37 ±0 37 ±0 2191 ±8 # TR5-20 20 35220 ±671 167 ±5 4621 ±154 2172 ±21 0.0013 ±0.0000 46 ±1 46 ±1.3 2173 ±21 # TR5-24 24.7 14738 ±73 279 ±6 2304 ±54 1977 ±6 0.0026 ±0.0000 97 ±1 97 ±1 1977 ±6 # TR5-37 34.3 7850 ±40 341 ±7 1359 ±29 1960 ±7 0.0036 ±0.0000 13 ±1 131 ±1 1961 ±7 # TR5-33 36.2 21981 ±299 102 ±3 12840 ±392 1864 ±14 0.0036 ±0.0001 13 ±3 137 ±2.9 1864 ±15 # TR5-53 52.5 4837 ±17 1316 ±27 284 ±6 2067 ±6 0.0047 ±0.0000 167 ±1 164 ±2 2068 ±6 # # LD12-5 1.6 887 ±1.6 350 ±2 24 ±4 2264 ±5.8 0.0006 ±0.0001 20 ±3 16 ±4 2264 ±6 # LD2-9 5.1 1013 ±2.7 249 ±5 30 ±5 2206 ±5 0.0005 ±0.0001 15 ±3 13 ±003 2206 ±5 # LD12-11 7.8 1214 ±4.2 188 ±4 92 ±5 2239 ±6 0.0009 ±0.0000 29 ±2 28 ±002 2240 ±6 # LD12-34 10.6 1421 ±5.0 210 ±4 164 ±5 1932 ±5 0.0015 ±0.0000 55 ±1 53 ±002 1932 ±5 # LD12-35 35.2 1564 ±5.9 523 ±11 41 ±2 1732 ±5 0.0008 ±0.0000 33 ±1 29 ±003 1732 ±5 # LD12-50 50 1718 ±10.0 162 ±3 443 ±11 2030 ±8.4 0.0025 ±0.0000 91 ±1 90 ±1 2031 ±8 # # *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%. # #------------------ # Variables # # End Description/Documentation (lines begin with #) # Data lines follow (have no #) # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: material, error, units, anomaly, period, archive, detail, method, C or N for Character or Numeric data) # Data line format: tab-delimited text, variable short name as header age_AD Age (AD), , ,AD, , , , ,N d18Ocarb delta O18 Carbonate, , , permil VPDB, , , , , N age_AD d18Ocarb 1911 -2.29 1909 -2.45 1908 -2.74 1906 -2.93 1904 -3.01 1902 -3.09 1901 -2.58 1899 -2.7 1897 -2.89 1896 -3.09 1894 -2.99 1892 -3.09 1890 -3.12 1889 -3.11 1887 -3.14 1885 -3.27 1884 -3.2 1882 -3.18 1880 -3.17 1878 -3.25 1877 -3.05 1875 -3.1 1873 -3.11 1872 -3.15 1870 -3.04 1868 -3.06 1866 -2.67 1865 -2.93 1863 -3.22 1857 -3.17 1851 -3.21 1845 -3.1 1839 -3.26 1833 -3.06 1827 -3.07 1821 -3.57 1815 -3.63 1809 -3.71 1803 -3.79 1797 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