# 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-gb10042-1.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 # Location: Indian Ocean # Country: # Northernmost_Latitude: -7.1135 # Southernmost_Latitude: -7.1135 # Easternmost_Longitude: 104.643 # Westernmost_Longitude: 104.643 # Elevation: -2454 #--------------------------------------- # Data_Collection # Collection_Name: GeoB10042-1 Setiawan2015 # First_Year: 39420 # Last_Year: 4200 # 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 # 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) ## Depth depth,,,centimeter,,paleoceanography,,,N, ## 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?µm): 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] #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NaN Depth age d18O-G.rub Mg/Ca-G.rub SST-Mg/Ca d18Osw 13 4.20 -2.46 3.61 25.00 -0.10 18 4.46 -2.61 4.19 26.67 0.10 23 4.64 -2.65 4.14 26.54 0.03 28 4.75 -2.77 4.11 26.46 -0.11 33 4.86 -2.23 4.27 26.88 0.52 38 5.04 -2.18 4.51 27.48 0.69 43 5.20 -2.51 3.92 25.92 0.03 48 5.32 -2.64 3.70 25.30 -0.23 53 5.42 -2.50 4.05 26.30 0.12 58 5.53 -2.43 4.88 28.36 0.61 63 5.65 -2.22 4.30 26.95 0.53 68 5.77 -2.00 3.94 25.99 0.55 73 5.88 -2.46 4.20 26.68 0.23 78 5.99 -2.02 3.91 25.89 0.51 83 6.11 -2.54 4.13 26.51 0.11 88 6.22 -2.55 4.44 27.32 0.27 93 6.33 -2.48 4.44 27.33 0.35 98 6.45 -2.34 4.06 26.32 0.27 103 6.55 -2.24 4.04 26.26 0.36 108 6.67 -2.50 NaN NaN NaN 113 6.80 -2.28 4.10 26.44 0.35 118 6.93 -2.32 3.91 25.89 0.19 123 7.06 -2.14 3.51 24.69 0.12 128 7.19 -2.39 3.86 25.75 0.08 133 7.33 -2.56 4.34 27.06 0.19 138 7.46 -2.35 NaN NaN NaN 143 7.60 -2.40 4.45 27.33 0.27 148 7.73 -2.43 4.28 26.90 0.27 153 7.86 -2.45 4.25 26.84 0.23 158 7.99 -2.41 4.27 26.88 0.28 163 8.11 -2.04 NaN NaN NaN 168 8.23 -2.30 4.32 27.00 0.40 173 8.34 -1.29 NaN NaN NaN 178 8.46 -2.20 NaN NaN NaN 183 8.58 -2.28 4.11 26.45 0.27 188 8.70 -2.31 4.25 26.83 0.31 193 8.82 -2.40 4.45 27.35 0.32 198 8.93 -2.07 4.70 27.94 0.77 203 9.05 -2.17 NaN NaN NaN 208 9.19 -2.58 4.47 27.40 0.10 213 9.36 -2.12 3.65 25.13 0.07 218 9.52 -2.46 4.66 27.84 0.21 223 9.68 -2.59 NaN NaN NaN 228 9.84 -2.09 4.04 26.26 0.08 233 10.00 -2.01 3.73 25.38 -0.12 238 13.24 -1.68 4.01 26.19 0.29 243 14.70 -1.03 4.02 26.22 0.77 248 15.00 -0.67 3.95 26.03 1.06 253 15.35 -0.75 4.18 26.63 1.08 258 15.68 -0.72 3.99 26.14 0.99 263 15.97 -0.73 4.16 26.59 1.06 268 16.37 -0.51 4.48 27.40 1.43 273 16.83 -0.57 3.56 24.85 0.81 278 17.34 -0.46 3.61 25.00 0.93 283 17.83 -0.63 3.77 25.51 0.85 288 18.34 -0.59 3.64 25.10 0.80 293 18.83 -0.71 3.61 25.02 0.64 298 19.28 -0.21 3.60 25.00 1.13 303 19.69 -0.54 3.40 24.33 0.66 308 20.05 -0.78 3.43 24.46 0.45 313 20.47 -0.66 3.43 24.44 0.56 318 20.89 -0.56 3.15 23.51 0.48 323 21.31 -1.02 3.46 24.53 0.24 328 21.74 -1.01 3.55 24.83 0.31 333 22.17 -0.67 3.44 24.48 0.58 338 22.60 -0.70 3.61 25.01 0.68 343 23.04 -0.89 3.35 24.17 0.32 348 23.45 -0.62 3.35 24.17 0.60 353 23.89 -0.72 3.42 24.41 0.56 358 24.32 -0.66 3.57 24.88 0.72 363 24.76 -0.78 3.66 25.18 0.68 368 25.20 -0.70 3.53 24.75 0.69 373 25.63 -0.58 3.17 23.59 0.58 378 26.05 -0.61 3.12 23.38 0.52 383 26.47 -0.61 3.51 24.69 0.82 388 26.90 -0.65 3.09 23.27 0.49 393 27.31 -0.88 3.22 23.74 0.38 398 27.71 -0.75 3.37 24.25 0.63 403 28.06 -0.69 3.43 24.45 0.76 408 28.46 -0.80 3.26 23.89 0.56 413 28.90 -0.50 3.66 25.17 1.16 418 29.35 -1.23 3.54 24.80 0.38 423 29.80 -1.03 3.68 25.23 0.68 428 30.24 -0.86 3.47 24.59 0.73 433 30.70 -0.84 3.14 23.45 0.52 438 31.15 -0.98 3.26 23.87 0.48 443 31.61 -0.78 3.31 24.06 0.73 448 32.07 -1.02 3.66 25.17 0.72 453 32.53 -1.03 3.27 23.92 0.45 458 32.97 -1.67 3.46 24.53 -0.07 463 33.43 -1.08 3.58 24.94 0.61 468 33.87 -1.05 3.54 24.79 0.61 473 34.32 -0.85 3.47 24.59 0.76 478 34.71 -1.01 3.58 24.93 0.67 483 35.10 -0.81 3.69 25.27 0.95 488 35.49 -1.31 3.86 25.77 0.54 493 35.89 -1.53 3.73 25.37 0.25 498 36.27 -1.33 3.84 25.70 0.52 503 36.65 -1.00 3.74 25.40 0.79 508 37.05 -1.06 3.59 24.95 0.64 513 37.44 -1.05 3.79 25.56 0.78 518 37.84 -1.17 3.88 25.82 0.73 523 38.23 -1.08 3.37 24.24 0.50 528 38.63 -0.98 3.65 25.12 0.81 533 39.02 -1.01 3.56 24.85 0.74 538 39.42 NaN NaN NaN NaN