# Eastern Tropical Indian Ocean d18O, Mg/Ca and SST Reconstruction Data during the last 40,000 years #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/26210 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/setiawan2015/setiawan2015-gb42-1-gb43-3-splice.txt # Description: NOAA location of the template # # Data_Type: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: oxygen isotopes, trace metals in carbonates, reconstruction #--------------------------------------- # Contribution_Date # Date: 2019-02-15 #--------------------------------------- # File_Last_Modified_Date # Date: 2019-02-15 #--------------------------------------- # Title # Study_Name: Eastern Tropical Indian Ocean d18O, Mg/Ca and SST Reconstruction Data during the last 40,000 years #--------------------------------------- # Investigators # Investigators: Setiawan, R.Y.; Mohtadi, M.; Southon, J.; Groeneveld, J.; Steinke, S.; Hebbeln, D. #--------------------------------------- # Description_Notes_and_Keywords # Description: #--------------------------------------- # Publication # Authors: Setiawan, R.Y., M. Mohtadi, J. Southon, J. Groeneveld, S. Steinke, and D. Hebbeln # Published_Date_or_Year: 2015 # Published_Title: The consequences of opening the Sunda Strait on the hydrography of the eastern tropical Indian Ocean # Journal_Name: Paleoceanography # Volume: 30 # Edition: # Issue: 10 # Pages: 1358-1372 # Report_Number: # DOI: 10.1002/2015PA002802 # Online_Resource: # Full_Citation: # Abstract: The advection of relatively fresh Java Sea water through the Sunda Strait is presently responsible for the low-salinity "tongue" in the eastern tropical Indian Ocean with salinities as low as 32‰. The evolution of the hydrologic conditions in the eastern tropical Indian Ocean since the last glacial period, when the Sunda shelf was exposed and any advection via the Sunda Strait was cutoff, and the degree to which these conditions were affected by the Sunda Strait opening are not known. Here we have analyzed two sediment cores (GeoB 10042–1 and GeoB 10043–3) collected from the eastern tropical Indian Ocean off the Sunda Strait that cover the past ~40,000 years. We investigate the magnitude of terrigenous supply, sea surface temperature (SST), and seawater δ18O (δ18Osw) changes related to the sea level‐driven opening of the Sunda Strait. Our new spliced records off the Sunda Strait show that during the last glacial, average SST was cooler and δ18Osw was higher than elsewhere in the eastern tropical Indian Ocean. Seawater δ18O decreased ~0.5‰ after the opening of the Sunda Strait at ~10 kyr B.P. accompanied by an SST increase of 1.7°C. We suggest that fresher sea surface conditions have persisted ever since due to a continuous transport of low‐salinity Java Sea water into the eastern tropical Indian Ocean via the Sunda Strait that additionally increased marine productivity through the concomitant increase in terrigenous supply. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site_Information # Site_Name: GeoB10042-1/10043-3 # Location: Indian Ocean # Country: # Northernmost_Latitude: -7.1135 # Southernmost_Latitude: -7.3095 # Easternmost_Longitude: 105.058833 # Westernmost_Longitude: 104.643 # Elevation: #--------------------------------------- # Data_Collection # Collection_Name: GeoB10042-1/10043-3 splice Setiawan2015 # First_Year: 39500 # Last_Year: 0 # Time_Unit: cal yr BP # Core_Length: # Notes: #--------------------------------------- # Chronology_Information # Chronology: # GeoB 10042-1 # UCIAMS # Depth (cm) 14C_age (years B.P.) Error Calendar Age (years B.P.) 1s Species Reference # 89145 8 3895 20 3751 65 G.ruber, G.sacculifer 1 # 98276 13 4225 40 4201 91 G.sacculifer 1 # 98279 18 4440 50 4491 89 G.sacculifer 1 # 98281 23 4580 15 4670 124 G.sacculifer 1 # 98284 33 4675 45 4798 81 G.sacculifer 1 # 98288 38 4885 20 5078 78 G.sacculifer 1 # 98291 43 5015 25 5259 67 G.sacculifer 1 # 103693 100 6130 45 6460 76 G.ruber, G.sacculifer 2 # 127996 163 7740 60 8108 82 G.ruber, G.sacculifer 2 # 103694 200 8440 50 8917 89 G.ruber, G.sacculifer 2 # 130252 213 8885 45 9460 49 G.ruber, G.sacculifer 2 # 130253 238 11830 60 13223 74 G.ruber, G.sacculifer 2 # 127997 243 13065 30 14909 140 G.ruber, G.sacculifer 2 # 130254 263 13760 60 15949 120 G.ruber, G.sacculifer 2 # 103695 300 16620 90 19454 139 G.ruber, G.sacculifer 2 # 103696 400 24210 130 27797 113 G.ruber, G.sacculifer 2 # 103698 470 30750 750 34286 677 G.ruber, G.sacculifer 2 # 103700 500 32390 660 35834 712 G.ruber, G.sacculifer 2 # GeoB 10043-3 NaN NaN NaN NaN NaN NaN NaN # 89142 13 545 35 84 59 G.ruber, G.sacculifer 1 # 89143 18 640 35 177 70 G.ruber, G.sacculifer 1 # 98502 23 1150 25 627 37 G.sacculifer 1 # 98506 28 1570 35 1029 62 G.ruber 1 # 98508 33 2070 25 1539 65 G.sacculifer 1 # 98510 38 2240 15 1741 59 G.sacculifer 1 # 98518 43 2525 30 2076 71 G.sacculifer 1 # 98520 48 2760 30 2370 65 G.sacculifer 1 # 103701 150 6520 20 6914 64 G.ruber, G.sacculifer 2 # 103702 200 8330 70 8769 129 G.ruber, G.sacculifer 2 # 103703 223 9140 90 9767 158 G.ruber, G.sacculifer 2 # 127998 273 13265 35 15215 78 G.ruber, G.sacculifer 2 # 103705 300 15235 50 17937 95 G.ruber, G.sacculifer 2 # 127999 328 19280 45 22632 106 G.ruber, G.sacculifer 2 # 103706 367 29740 490 33321 106 G.ruber, G.sacculifer 2 # 103707 385 31140 240 34580 233 G.ruber, G.sacculifer 2 # References: (1) Southon et al. [2013]; (2) this study. # #--------------------------------------- # 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) ## age age,,,calendar kiloyear before present,,paleoceanography,,,N, ## d18O-G.rub delta 18O,Globigerinoides ruber,,per mil PDB,,paleoceanography,,,N, ## Mg/Ca-G.rub magnesium/calcium,Globigerinoides ruber,, micromole per mole,,paleoceanography,,,N, ## SST-Mg/Ca sea surface temperature,magnesium/calcium; Globigerinoides ruber,,degree Celsius,,climate reconstructions; paleoceanography,,,N,used equation proposed by Anand et al. [2003] for G.?ruber (250–350?΅m): Mg/Ca=0.38exp^(0.09*T) ## d18Osw delta 18O,sea water,,per mil SMOW,,climate reconstructions; paleoceanography,,,N,used the d18O-temperature equation of Bemis et al. [1998] ## notes notes,,,,,paleoceanography,,,C, #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NaN age d18O-G.rub Mg/Ca-G.rub SST-Mg/Ca d18Osw notes 0 -2.49 NaN NaN NaN NaN 0.5 -2.57 4.42 27.26 0.27 NaN 1 -2.79 4.45 27.35 0.08 NaN 1.5 -2.83 4.30 26.95 -0.05 NaN 2 -2.52 4.18 26.63 0.19 NaN 2.5 -2.69 4.05 26.28 -0.05 NaN 3 -2.56 4.23 26.78 0.18 NaN 3.5 -2.59 4.47 27.38 0.27 NaN 4 -2.53 4.43 27.26 0.30 NaN 4.5 -2.56 4.04 26.25 0.05 NaN 5 -2.60 4.16 26.59 0.09 NaN 5.5 -2.35 4.13 26.48 0.31 NaN 6 -2.23 4.23 26.76 0.48 NaN 6.5 -2.44 4.24 26.81 0.27 NaN 7 -2.37 4.03 26.25 0.25 NaN 7.5 -2.36 4.03 26.21 0.20 NaN 8 -2.37 4.19 26.66 0.25 NaN 8.5 -2.08 4.13 26.49 0.27 NaN 9 -2.35 4.37 26.99 0.30 NaN 9.5 -2.22 4.18 26.60 0.28 NaN 10 -2.37 4.19 26.63 0.02 NaN 10.5 NaN NaN NaN NaN turbidite 11 NaN NaN NaN NaN NaN 11.5 NaN NaN NaN NaN NaN 12 -1.19 4.31 26.99 1.19 NaN 12.5 -1.31 4.30 26.97 1.00 NaN 13 -0.94 4.16 26.58 1.21 NaN 13.5 -1.71 4.06 26.33 0.30 NaN 14 -1.39 4.00 26.15 0.54 NaN 14.5 -1.14 3.69 25.26 0.53 NaN 15 -1.00 4.06 26.33 0.82 NaN 15.5 -0.91 3.98 26.10 0.82 NaN 16 -0.84 4.05 26.30 0.90 NaN 16.5 -0.78 4.27 26.86 1.05 NaN 17 -0.75 3.51 24.72 0.61 NaN 17.5 -0.59 3.69 25.26 0.86 NaN 18 -0.63 3.71 25.32 0.81 NaN 18.5 -0.68 3.71 25.31 0.74 NaN 19 -0.75 3.62 25.06 0.61 NaN 19.5 -0.21 3.60 25.00 1.13 NaN 20 -0.57 3.34 24.15 0.59 NaN 20.5 -0.66 3.43 24.44 0.56 NaN 21 -0.76 3.42 24.37 0.45 NaN 21.5 -1.02 3.46 24.53 0.24 NaN 22 -0.92 3.53 24.78 0.39 NaN 22.5 -0.67 3.44 24.48 0.58 NaN 23 -0.83 3.57 24.90 0.52 NaN 23.5 -0.75 3.35 24.17 0.46 NaN 24 -0.59 3.63 25.04 0.82 NaN 24.5 -0.66 3.57 24.88 0.72 NaN 25 -0.76 3.65 25.13 0.70 NaN 25.5 -0.70 3.53 24.75 0.69 NaN 26 -0.58 3.17 23.59 0.58 NaN 26.5 -0.63 3.36 24.21 0.70 NaN 27 -0.65 3.09 23.27 0.49 NaN 27.5 -0.88 3.22 23.74 0.38 NaN 28 -0.86 3.37 24.26 0.54 NaN 28.5 -0.75 3.35 24.17 0.66 NaN 29 -0.50 3.66 25.17 1.16 NaN 29.5 -0.97 3.51 24.71 0.61 NaN 30 -1.03 3.68 25.23 0.68 NaN 30.5 -0.86 3.47 24.59 0.73 NaN 31 -0.72 3.38 24.26 0.81 NaN 31.5 -0.98 3.26 23.87 0.48 NaN 32 -0.78 3.31 24.06 0.73 NaN 32.5 -1.05 3.88 25.79 0.82 NaN 33 -1.35 3.36 24.23 0.19 NaN 33.5 -1.08 3.58 24.94 0.61 NaN 34 -1.17 3.61 25.00 0.53 NaN 34.5 -0.85 3.47 24.59 0.76 NaN 35 -1.01 3.58 24.93 0.67 NaN 35.5 -1.06 3.78 25.52 0.75 NaN 36 -1.53 3.73 25.37 0.25 NaN 36.5 -1.33 3.84 25.70 0.52 NaN 37 -1.00 3.74 25.40 0.79 NaN 37.5 -1.06 3.69 25.25 0.71 NaN 38 -1.17 3.88 25.82 0.73 NaN 38.5 -1.08 3.37 24.24 0.50 NaN 39 -0.98 3.65 25.12 0.81 NaN 39.5 -1.00 3.68 25.22 0.83 NaN