Equatorial Indian Ocean 130kyr Mg/Ca Data and SST Reconstruction ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Equatorial Indian Ocean 130kyr Mg/Ca Data and SST Reconstruction LAST UPDATE: 7/2008 (Original receipt by WDC Paleo) CONTRIBUTOR: Rajeev Saraswat, University of Delhi IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2008-063 WDC PALEO CONTRIBUTION SERIES CITATION: Saraswat, R., et al.. 2008. Equatorial Indian Ocean 130kyr Mg/Ca Data and SST Reconstruction. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2008-063. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Saraswat, R., R. Nigam, S. Weldeab, A. Mackensen, and P.D. Naidu. 2005. A first look at past sea surface temperatures in the equatorial Indian Ocean from Mg/Ca in foraminifera. Geophys. Res. Lett., 32, L24605, doi:10.1029/2005GL024093. ABSTRACT: Sea surface temperature (SST) for the central equatorial Indian Ocean, has been reconstructed over the last ~137 kyr, from Mg/Ca of the planktonic foraminiferal species Globigerinoides ruber. According to our record the equatorial Indian Ocean SST was ~2.1°C colder during the last glacial maximum as compared to present times. The data further shows that the surface equatorial Indian Ocean was comparatively warmer during isotopic stage 5e than at present (~29.9 vs ~28.5°C). Comparison of the equatorial Indian Ocean SST with the Antarctic dD and Greenland d18O records, shows that the major high-latitude cooling/warming events are also present in the equatorial Indian Ocean SST variation record. Similarity between the equatorial Indian Ocean SST and the equatorial Pacific SST suggests the possibility of a common mechanism controlling the SSTs in both the equatorial Indian Ocean and the Pacific Ocean. ADDITIONAL REFERENCE: Dekens, P.S., D.W. Lea, D.K. Pak, and H.J. Spero. 2002. Core top calibration of Mg/Ca in tropical foraminifera: Refining paleotemperature estimation. Geochem. Geophys. Geosyst., 3(4), 1022, doi:10.1029/2001GC000200. GEOGRAPHIC REGION: Equatorial Indian Ocean PERIOD OF RECORD: 123KYrBP - present FUNDING SOURCES: Department of Ocean Development (Project No. DOD/18/PMN/EFC(BENFAN)/96), New Delhi. R.S. thankfully acknowledges financial support from Council of Scientific and Industrial Research, New Delhi and UGC-DAAD, in the form of Senior Research Fellowship and Short-term DAAD Fellowship, respectively. DESCRIPTION: Globigerinoides ruber (white) Mg/Ca data and sea surface temperature reconstruction from the equatorial Indian Ocean covering the last 130kyr. The Mg/Ca ratio was converted to SST using the depth corrected G. ruber Mg/Ca-SST calibration of Dekens et al. [2002]: (Mg/Ca = 0.38 exp 0.09 [SST - 0.61 (core depth km)]). Core SK 157/4, E. flank, Comorin ridge: 02°40'N, 78°00'E, 3500 m depth. DATA: Column 1: Depth (cm) Column 2: Age (Ka) Column 3: Mg/Ca (mmol/mol) Column 4: Est. Temp (°C) Depth Age Mg/Ca Temp 5.0 5.43 3.93 28.10 6.0 5.77 3.92 28.08 7.0 6.11 4.07 28.49 9.0 6.79 3.77 27.63 10.0 7.13 4.05 28.43 12.0 7.81 4.22 28.89 14.0 8.48 3.95 28.15 16.0 9.16 4.05 28.41 18.0 9.84 4.10 28.56 20.0 10.32 4.11 28.59 22.0 10.80 4.19 28.80 24.0 11.55 4.07 28.48 26.0 12.29 4.08 28.50 28.0 13.04 4.04 28.40 30.0 13.78 4.02 28.33 32.0 14.53 3.88 27.95 34.0 16.33 3.94 28.13 36.0 18.12 4.03 28.38 37.0 19.02 3.90 28.02 38.0 19.92 3.77 27.62 40.0 20.86 3.56 26.98 42.0 21.81 3.61 27.14 43.0 22.28 3.42 26.55 44.0 22.75 3.43 26.58 46.0 23.69 3.72 27.49 48.0 24.63 3.48 26.75 50.0 25.58 3.54 26.93 52.0 26.52 3.64 27.25 54.0 27.46 3.59 27.09 56.0 27.91 3.52 26.85 58.0 28.36 3.58 27.04 60.0 28.80 3.68 27.37 62.0 29.25 3.65 27.26 64.0 29.70 3.63 27.21 66.0 30.15 3.60 27.11 68.0 30.59 3.56 27.00 70.0 31.04 3.60 27.12 72.0 31.49 3.53 26.89 74.0 31.94 3.43 26.58 76.0 32.39 3.50 26.80 78.0 32.83 3.40 26.49 80.0 33.28 3.58 27.04 82.0 33.73 3.67 27.33 84.0 34.18 3.73 27.51 86.0 34.62 3.74 27.55 88.0 35.07 3.58 27.06 92.0 35.97 3.61 27.16 94.0 36.41 3.66 27.29 96.0 36.86 3.62 27.17 98.0 37.31 3.87 27.93 100.0 38.44 3.61 27.14 102.0 39.57 3.67 27.33 104.0 40.70 3.41 26.51 106.0 41.83 3.52 26.87 108.0 42.96 3.56 27.00 110.0 44.09 3.66 27.30 112.0 45.22 3.55 26.96 114.0 46.35 3.62 27.17 116.0 47.48 3.51 26.84 118.0 48.61 3.57 27.03 120.0 49.74 3.63 27.21 122.0 50.87 3.73 27.51 124.0 52.00 3.48 26.74 126.0 53.00 3.56 27.01 128.0 54.00 3.53 26.90 130.0 55.00 3.87 27.94 132.0 56.00 3.79 27.69 134.0 57.00 3.82 27.79 136.0 59.67 3.52 26.88 138.0 62.33 3.53 26.89 140.0 65.00 3.40 26.49 142.0 66.50 3.66 27.30 144.0 68.00 3.48 26.74 146.0 69.50 3.74 27.55 148.0 71.00 3.50 26.79 156.0 75.00 3.50 26.82 158.0 76.00 3.65 27.26 160.0 77.00 3.76 27.62 162.0 77.78 3.80 27.73 164.0 78.56 3.61 27.14 166.0 79.33 3.95 28.14 168.0 80.11 3.79 27.69 170.0 80.89 3.68 27.37 172.0 81.67 3.68 27.37 174.0 82.44 3.58 27.05 176.0 83.22 3.77 27.63 178.0 84.00 3.60 27.13 180.0 85.00 3.89 27.97 182.0 86.00 3.79 27.70 184.0 87.00 3.68 27.37 186.0 88.00 3.73 27.53 188.0 89.00 3.82 27.79 190.0 90.00 3.92 28.06 192.0 91.00 3.91 28.03 194.0 92.00 3.95 28.16 196.0 93.00 3.79 27.70 198.0 94.00 3.87 27.92 200.0 95.00 3.93 28.09 202.0 96.00 3.77 27.63 204.0 97.00 3.97 28.20 206.0 98.00 3.86 27.90 208.0 99.00 3.82 27.78 210.0 100.00 3.81 27.75 212.0 101.47 3.84 27.82 214.0 102.93 3.81 27.76 216.0 104.40 3.86 27.91 218.0 105.87 3.67 27.32 220.0 107.33 3.71 27.44 222.0 108.80 3.84 27.84 224.0 110.27 3.83 27.82 226.0 111.73 4.04 28.39 228.0 113.20 4.06 28.44 230.0 114.67 4.31 29.11 232.0 116.13 3.86 27.89 234.0 117.60 4.10 28.56 236.0 119.07 4.46 29.50 238.0 120.53 4.01 28.31 240.0 122.00 4.64 29.93 244.0 124.00 4.34 29.21 246.0 125.00 4.08 28.50 248.0 126.00 4.21 28.86 250.0 127.00 4.07 28.48 252.0 128.33 3.82 27.78 254.0 129.67 3.87 27.91 256.0 131.00 3.69 27.40 258.0 131.80 3.65 27.26 260.0 132.60 3.66 27.30 262.0 133.40 3.88 27.94 264.0 134.20 3.69 27.40 266.0 135.00 3.67 27.33 268.0 136.17 3.75 27.58 270.0 137.33 3.63 27.20