# Hon Tre Island, Vietnam 33 Year Paired Monthly Sr/Ca and d18O Data #---------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #---------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/17035 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-coral-17035.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Corals and Sclerosponges # # Dataset_DOI: 10.25921/y3w2-et87 # # Science_Keywords: #-------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/coral/west_pacific/hon-tre2014-tn-noaa.txt # Data_Download_Description: NOAA Template File; Hòn Tre Island Sample TN Monthly Sr/Ca and d18O Data # #-------------------- # Contribution_Date # Date: 2014-08-14 #-------------------- # File_Last_Modified_Date # Date: 2025-08-14 #-------------------- # Title # Study_Name: Hon Tre Island, Vietnam 33 Year Paired Monthly Sr/Ca and d18O Data #-------------------- # Investigators # Investigators: Bolton, A.(https://orcid.org/0000-0002-7252-2049); Goodkin, N.F.(https://orcid.org/0000-0001-9697-5520); Hughen, K.A.(https://orcid.org/0000-0003-3201-934X); Ostermann, D.R.; Vo, S.T.; Phan, H.K. #-------------------- # Description_Notes_and_Keywords # Description: Paired strontium-to-calcium (Sr/Ca) and d18O measurements at monthly resolution for two Porites lutea corals (BB and TN) recovered from Hon Tre Island, Vietnam. The coral Sr/Ca data were determined by inductively coupled plasma optical emission spectroscopy and oxygen isotopes were determined using isotope ratio mass spectrometry ionisation mass spectrometry. Blank sections in the beginning of TN represent no samples present (i.e. this was where the BB coral was younger than the TN coral). Other blanks in both BB and TN represent areas of growth that were not drillable (i.e. sections between coral slabs or areas where coralite growth was not optimal, see manuscript). #-------------------- # Publication # Authors: A. Bolton, N.F. Goodkin, K. Hughen, D.R. Ostermann, S.T. Vo, H.K. Phan # Journal_Name: Palaeogeography, Palaeoclimatology, Palaeoecology # Published_Title: Paired Porites coral Sr/Ca and d18O from the western South China Sea: Proxy calibration of sea surface temperature and precipitation # Published_Date_or_Year: 2014 # Volume: 410 # Issue: # Pages: 233-243 # Report_Number: # DOI: 10.1016/j.palaeo.2014.05.047 # Full_Citation: # Abstract: Paired strontium-to-calcium (Sr/Ca) and d18O measurements for two Porites lutea corals recovered from Hon Tre Island, Vietnam, are strongly correlated to sea surface temperature (SST) and precipitation at monthly to interannual time-scales. Least squares linear regression of monthly Sr/Ca to SST shows a strong, significant correlation (r2 = 0.77, p < .0001), with root mean square residuals of 0.9 °C. 3-year averaged (binned) Sr/Ca for wet (Sep-Nov) and dry (Jan-Mar) seasons separately captures SST variability at interannual time scales (Sr/Ca RMSR = 0.42 °C and 0.70 °C for wet and dry seasons, respectively). Coral d18O correlates weakly to SST at seasonal and interannual time scales for wet and dry seasons, with significant anomalies (d18O RMSR = 2.4 °C and 1.65 °C, respectively). Correcting the SST influence on coral d18O using paired Sr/Ca values provides estimates of d18O of seawater (d18Osw). 3-year averaged d18Osw during the wet season shows a significant correlation to local precipitation (r2 = 0.54, p = 0.01). These results show that coral Sr/Ca in this location accurately reflects SST at a number of timescales, and that seawater d18O composition in the wet season is controlled by local precipitation, largely unmodified by ocean circulation during the winter monsoon. This study highlights the sensitivity and utility of coral geochemistry in this region for reliably reconstructing SST and monsoonal precipitation. #-------------------- # Funding_Agency # Funding_Agency_Name: Woods Hole Oceanographic Institution # Grant: 27500040 #-------------------- # Funding_Agency # Funding_Agency_Name: National Research Foundation Singapore # Grant: NRFF-2012-03 #-------------------- # Funding_Agency # Funding_Agency_Name: Research Grants Council of Hong Kong # Grant: GRF-HKU702509P #-------------------- # Site_Information # Site_Name: Hòn Tre Island # Location: Vietnam # Northernmost_Latitude: 12.213861 # Southernmost_Latitude: 12.213861 # Easternmost_Longitude: 109.304864 # Westernmost_Longitude: 109.304864 # Elevation_m: -8 #-------------------- # Data_Collection # Collection_Name: HonTre2014 TN # First_Year: 1977 # Last_Year: 2005 # Time_Unit: CE # Core_Length_m: # Parameter_Keywords: chemistry, oxygen isotopes # Notes: Water depth 3.6 m #-------------------- # Chronology_Information # Chronology: # #-------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by '##' in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## year_mon notes,,,,,corals and sclerosponges,,,C,year and month ## age_CE age,,,year Common Era,,corals and sclerosponges,,,N, ## depth_mm depth,,,millimeter,,corals and sclerosponges,,,N, ## Sr/Ca-por strontium/calcium,Porites lutea,,millimole per mole,,corals and sclerosponges,interpolated,inductively-coupled plasma atomic emission spectroscopy,N, ## d18Opor delta 18O,Porites lutea,,per mil VPDB,,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N, #-------------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: year_mon age_CE depth_mm Sr/Ca-por d18Opor 2005-Jan 2005.042 0.0 9.1606 -5.4283 2004-Dec 2004.958 0.9 9.1135 -5.3221 2004-Nov 2004.875 1.6 9.0375 -5.9089 2004-Oct 2004.792 1.9 8.983 -5.7453 2004-Sep 2004.708 2.1 8.9489 -5.5691 2004-Aug 2004.625 2.3 8.9462 -5.3737 2004-Jul 2004.542 2.6 8.9381 -5.2313 2004-Jun 2004.458 2.8 8.9101 -5.2867 2004-May 2004.375 3.1 8.8895 -5.2983 2004-Apr 2004.292 5.2 9.0608 -4.5281 2004-Mar 2004.208 7.3 9.1393 -4.6678 2004-Feb 2004.125 9.4 9.1804 -5.0485 2004-Jan 2004.042 10.3 9.1568 -5.1865 2003-Dec 2003.958 11.2 9.1469 -5.4761 2003-Nov 2003.875 11.7 9.041 -5.4669 2003-Oct 2003.792 12.0 8.9345 -5.4404 2003-Sep 2003.708 12.2 8.9191 -5.5362 2003-Aug 2003.625 12.4 8.9086 -5.6385 2003-Jul 2003.542 12.7 8.8924 -5.6483 2003-Jun 2003.458 12.9 8.8732 -5.6094 2003-May 2003.375 13.3 8.8648 -5.4305 2003-Apr 2003.292 14.2 8.9499 -5.0635 2003-Mar 2003.208 15.1 9.0273 -4.7026 2003-Feb 2003.125 16.0 9.1277 -4.307 2003-Jan 2003.042 16.5 9.1057 -4.2218 2002-Dec 2002.958 17.0 9.0686 -4.2339 2002-Nov 2002.875 17.4 9.0009 -5.4922 2002-Oct 2002.792 17.8 8.9826 -5.07 2002-Sep 2002.708 18.1 8.9738 -4.386 2002-Aug 2002.625 18.4 8.9462 -4.6348 2002-Jul 2002.542 18.7 8.9249 -4.8905 2002-Jun 2002.458 19.0 8.9081 -5.15 2002-May 2002.375 19.3 8.9453 -5.0122 2002-Apr 2002.292 19.7 9.0157 -5.0022 2002-Mar 2002.208 20.4 9.0599 -4.9751 2002-Feb 2002.125 21.3 9.1097 -4.8845 2002-Jan 2002.042 21.8 9.1138 -4.868 2001-Dec 2001.958 22.2 9.097 -4.9043 2001-Nov 2001.875 22.6 9.0757 -4.8935 2001-Oct 2001.792 22.7 9.0479 -5.0223 2001-Sep 2001.708 22.9 9.0202 -5.1511 2001-Aug 2001.625 23.1 9.0026 -5.1941 2001-Jul 2001.542 23.2 8.9993 -5.1174 2001-Jun 2001.458 23.4 8.996 -5.0407 2001-May 2001.375 23.6 8.9956 -4.9936 2001-Apr 2001.292 24.5 9.1131 -5.5415 2001-Mar 2001.208 25.3 9.0815 -5.6178 2001-Feb 2001.125 25.8 9.1151 -5.8226 2001-Jan 2001.042 26.2 9.1066 -5.8789 2000-Dec 2000.958 26.5 9.0825 -5.8641 2000-Nov 2000.875 26.7 9.0594 -5.8469 2000-Oct 2000.792 27.0 9.0364 -5.8292 2000-Sep 2000.708 27.2 9.0334 -5.9287 2000-Aug 2000.625 27.4 9.035 -6.0558 2000-Jul 2000.542 27.6 9.0244 -6.1013 2000-Jun 2000.458 27.8 8.9962 -6.0314 2000-May 2000.375 28.0 8.9729 -5.9614 2000-Apr 2000.292 29.1 8.9981 -5.5793 2000-Mar 2000.208 29.8 9.1471 -5.408 2000-Feb 2000.125 30.2 9.2322 -5.2368 2000-Jan 2000.042 30.6 9.2515 -5.0882 1999-Dec 1999.958 31.2 9.1773 -5.4221 1999-Nov 1999.875 32.4 9.0934 -5.2007 1999-Oct 1999.792 35.0 9.0721 -5.522 1999-Sep 1999.708 37.5 8.9992 -5.8117 1999-Aug 1999.625 38.2 9.0722 -5.5904 1999-Jul 1999.542 38.9 9.1602 -5.2734 1999-Jun 1999.458 39.6 9.0951 -4.9127 1999-May 1999.375 40.3 9.1544 -4.8918 1999-Apr 1999.292 41.0 9.1235 -4.9223 1999-Mar 1999.208 41.6 9.1545 -4.9527 1999-Feb 1999.125 41.9 9.2237 -4.9832 1999-Jan 1999.042 42.3 9.2532 -5.0137 1998-Dec 1998.958 43.1 9.212 -5.1105 1998-Nov 1998.875 44.1 9.0977 -5.5944 1998-Oct 1998.792 44.6 9.0381 -5.7208 1998-Sep 1998.708 45.1 9.0715 -5.8005 1998-Aug 1998.625 45.6 9.0142 -5.8522 1998-Jul 1998.542 46.1 9.0171 -5.9126 1998-Jun 1998.458 46.5 8.9504 -6.0466 1998-May 1998.375 47.0 8.943 -5.8087 1998-Apr 1998.292 49.0 9.0704 -5.1191 1998-Mar 1998.208 50.9 9.1586 -5.272 1998-Feb 1998.125 52.8 9.1537 -5.4073 1998-Jan 1998.042 54.6 9.2069 -5.0528 1997-Dec 1997.958 55.8 9.165 -5.3601 1997-Nov 1997.875 56.8 9.1303 -5.8043 1997-Oct 1997.792 57.2 9.1034 -5.7737 1997-Sep 1997.708 57.3 9.0802 -5.7317 1997-Aug 1997.625 57.5 9.057 -5.6897 1997-Jul 1997.542 57.7 9.0392 -5.8799 1997-Jun 1997.458 57.8 9.0219 -6.0923 1997-May 1997.375 58.1 9.0151 -6.2717 1997-Apr 1997.292 60.1 9.0311 -5.3363 1997-Mar 1997.208 62.2 9.2778 -4.9296 1997-Feb 1997.125 64.3 9.2798 -4.8017 1997-Jan 1997.042 66.3 9.2915 -4.876 1996-Dec 1996.958 67.9 9.2105 -4.8825 1996-Nov 1996.875 69.4 9.104 -5.0568 1996-Oct 1996.792 70.7 9.0534 -5.0677 1996-Sep 1996.708 72.0 9.0076 -5.7523 1996-Aug 1996.625 73.3 8.9422 -5.7118 1996-Jul 1996.542 74.6 8.8846 -5.732 1996-Jun 1996.458 75.7 8.8992 -5.4686 1996-May 1996.375 76.9 8.9843 -5.1749 1996-Apr 1996.292 78.1 9.0557 -4.7659 1996-Mar 1996.208 79.4 9.1163 -4.6783 1996-Feb 1996.125 80.8 9.1711 -4.4943 1996-Jan 1996.042 82.3 9.2156 -4.6576 1995-Dec 1995.958 84.1 9.0479 -4.861 1995-Nov 1995.875 85.9 9.0862 -5.48 1995-Oct 1995.792 87.7 8.9925 -6.0251 1995-Sep 1995.708 89.4 8.9101 -5.9762 1995-Aug 1995.625 91.1 8.8408 -6.067 1995-Jul 1995.542 92.0 8.9155 -6.0949 1995-Jun 1995.458 92.8 8.9833 -5.9971 1995-May 1995.375 93.6 8.9789 -5.6533 1995-Apr 1995.292 94.4 9.0258 -5.1322 1995-Mar 1995.208 95.1 9.0532 -4.9237 1995-Feb 1995.125 95.7 9.1153 -4.9613 1995-Jan 1995.042 96.1 9.1511 -4.9384 1994-Dec 1994.958 96.2 9.1111 -4.909 1994-Nov 1994.875 96.3 9.0711 -4.8797 1994-Oct 1994.792 96.4 9.0311 -4.8503 1994-Sep 1994.708 96.5 8.9997 -4.8177 1994-Aug 1994.625 96.7 8.991 -4.7761 1994-Jul 1994.542 96.8 8.9824 -4.7346 1994-Jun 1994.458 96.9 8.9737 -4.6931 1994-May 1994.375 97.1 8.9785 -4.8178 1994-Apr 1994.292 97.8 9.0427 -5.3046 1994-Mar 1994.208 98.6 9.1392 -5.1899 1994-Feb 1994.125 99.3 9.156 -5.2826 1994-Jan 1994.042 100.1 9.2174 -5.1734 1993-Dec 1993.958 100.8 9.1401 -5.2128 1993-Nov 1993.875 101.4 9.0825 -5.5341 1993-Oct 1993.792 103.0 9.0671 -5.7657 1993-Sep 1993.708 104.7 9.0334 -6.0563 1993-Aug 1993.625 106.4 8.9289 -6.0433 1993-Jul 1993.542 108.1 9.0158 -5.9819 1993-Jun 1993.458 109.8 9.0873 -5.6079 1993-May 1993.375 111.5 8.9503 -5.5229 1993-Apr 1993.292 114.8 8.967 -4.9816 1993-Mar 1993.208 116.8 9.1243 -5.3977 1993-Feb 1993.125 117.6 9.1981 -5.235 1993-Jan 1993.042 118.6 9.1441 -5.1004 1992-Dec 1992.958 1992-Nov 1992.875 1992-Oct 1992.792 1992-Sep 1992.708 1992-Aug 1992.625 1992-Jul 1992.542 1992-Jun 1992.458 1992-May 1992.375 1992-Apr 1992.292 1992-Mar 1992.208 1992-Feb 1992.125 1992-Jan 1992.042 1991-Dec 1991.958 1991-Nov 1991.875 1991-Oct 1991.792 1991-Sep 1991.708 1991-Aug 1991.625 1991-Jul 1991.542 1991-Jun 1991.458 1991-May 1991.375 1991-Apr 1991.292 1991-Mar 1991.208 1991-Feb 1991.125 1991-Jan 1991.042 1990-Dec 1990.958 1990-Nov 1990.875 1990-Oct 1990.792 1990-Sep 1990.708 1990-Aug 1990.625 1990-Jul 1990.542 1990-Jun 1990.458 1990-May 1990.375 1990-Apr 1990.292 1990-Mar 1990.208 1990-Feb 1990.125 1990-Jan 1990.042 1989-Dec 1989.958 1989-Nov 1989.875 1989-Oct 1989.792 1989-Sep 1989.708 1989-Aug 1989.625 1989-Jul 1989.542 1989-Jun 1989.458 1989-May 1989.375 1989-Apr 1989.292 1989-Mar 1989.208 1989-Feb 1989.125 1989-Jan 1989.042 1988-Dec 1988.958 1988-Nov 1988.875 1988-Oct 1988.792 1988-Sep 1988.708 1988-Aug 1988.625 1988-Jul 1988.542 1988-Jun 1988.458 1988-May 1988.375 1988-Apr 1988.292 1988-Mar 1988.208 1988-Feb 1988.125 1988-Jan 1988.042 1987-Dec 1987.958 1987-Nov 1987.875 1987-Oct 1987.792 1987-Sep 1987.708 1987-Aug 1987.625 1987-Jul 1987.542 1987-Jun 1987.458 1987-May 1987.375 1987-Apr 1987.292 1987-Mar 1987.208 1987-Feb 1987.125 1987-Jan 1987.042 1986-Dec 1986.958 190.7 9.1766 -4.7801 1986-Nov 1986.875 191.1 9.114 -4.9417 1986-Oct 1986.792 191.4 9.0714 -5.0501 1986-Sep 1986.708 191.6 9.0299 -5.1868 1986-Aug 1986.625 191.9 8.9899 -5.3617 1986-Jul 1986.542 192.1 8.9562 -5.5021 1986-Jun 1986.458 192.3 8.9373 -5.5638 1986-May 1986.375 192.8 8.9413 -5.6885 1986-Apr 1986.292 194.0 9.0845 -5.2213 1986-Mar 1986.208 195.1 9.1491 -4.8855 1986-Feb 1986.125 196.1 9.2208 -4.7571 1986-Jan 1986.042 196.7 9.2045 -4.7496 1985-Dec 1985.958 197.0 9.1435 -4.9009 1985-Nov 1985.875 197.3 9.1032 -5.0979 1985-Oct 1985.792 197.6 9.066 -5.2921 1985-Sep 1985.708 197.9 9.032 -5.4467 1985-Aug 1985.625 198.1 9.0009 -5.5178 1985-Jul 1985.542 198.4 8.9738 -5.484 1985-Jun 1985.458 198.7 8.9575 -5.4696 1985-May 1985.375 199.1 8.9614 -5.4225 1985-Apr 1985.292 200.8 9.0057 -5.108 1985-Mar 1985.208 202.1 9.0917 -5.0464 1985-Feb 1985.125 203.1 9.1324 -4.8226 1985-Jan 1985.042 204.0 9.1804 -4.9609 1984-Dec 1984.958 204.2 9.1171 -5.2547 1984-Nov 1984.875 204.4 9.0538 -5.5485 1984-Oct 1984.792 204.6 9.0199 -5.6496 1984-Sep 1984.708 204.8 9.0004 -5.6561 1984-Aug 1984.625 205.0 8.9808 -5.6625 1984-Jul 1984.542 205.2 8.9634 -5.7302 1984-Jun 1984.458 205.3 8.9464 -5.8081 1984-May 1984.375 205.6 8.9346 -5.884 1984-Apr 1984.292 207.7 9.0411 -5.0268 1984-Mar 1984.208 209.2 9.1347 -5.2748 1984-Feb 1984.125 209.9 9.2094 -5.2112 1984-Jan 1984.042 210.5 9.2457 -4.7244 1983-Dec 1983.958 211.2 9.1952 -4.7723 1983-Nov 1983.875 211.8 9.0646 -5.078 1983-Oct 1983.792 212.4 8.9473 -5.7166 1983-Sep 1983.708 212.9 8.8489 -5.7698 1983-Aug 1983.625 213.3 8.858 -5.6855 1983-Jul 1983.542 213.7 8.8784 -5.5412 1983-Jun 1983.458 214.1 8.8939 -5.3854 1983-May 1983.375 214.5 8.9219 -5.3272 1983-Apr 1983.292 214.9 8.9991 -5.2689 1983-Mar 1983.208 215.4 9.1634 -5.0484 1983-Feb 1983.125 216.0 9.2775 -4.9638 1983-Jan 1983.042 216.6 9.3018 -4.9383 1982-Dec 1982.958 217.1 9.1914 -4.7895 1982-Nov 1982.875 217.6 9.0968 -4.8707 1982-Oct 1982.792 217.9 9.0771 -4.9994 1982-Sep 1982.708 218.2 9.0488 -5.2485 1982-Aug 1982.625 218.5 9.0156 -5.6695 1982-Jul 1982.542 218.9 8.98 -5.6503 1982-Jun 1982.458 219.2 8.9477 -5.631 1982-May 1982.375 219.5 8.9189 -5.6501 1982-Apr 1982.292 220.0 8.9896 -5.7997 1982-Mar 1982.208 220.5 9.0672 -5.6389 1982-Feb 1982.125 220.9 9.1237 -5.609 1982-Jan 1982.042 221.4 9.1393 -5.6106 1981-Dec 1981.958 1981-Nov 1981.875 1981-Oct 1981.792 1981-Sep 1981.708 1981-Aug 1981.625 1981-Jul 1981.542 1981-Jun 1981.458 1981-May 1981.375 1981-Apr 1981.292 1981-Mar 1981.208 1981-Feb 1981.125 1981-Jan 1981.042 1980-Dec 1980.958 227.7 9.1525 -4.8784 1980-Nov 1980.875 228.2 9.1074 -5.1107 1980-Oct 1980.792 228.6 9.0732 -5.2641 1980-Sep 1980.708 228.9 8.9817 -5.5749 1980-Aug 1980.625 229.3 8.9236 -5.7565 1980-Jul 1980.542 229.6 8.885 -5.8852 1980-Jun 1980.458 230.0 8.8596 -5.7452 1980-May 1980.375 230.7 8.9296 -5.6252 1980-Apr 1980.292 231.4 8.9789 -5.4476 1980-Mar 1980.208 231.8 9.1262 -5.1554 1980-Feb 1980.125 232.2 9.2254 -5.0123 1980-Jan 1980.042 232.5 9.2638 -4.9287 1979-Dec 1979.958 233.2 9.2153 -4.5505 1979-Nov 1979.875 233.8 9.134 -4.9533 1979-Oct 1979.792 234.3 9.0814 -5.1809 1979-Sep 1979.708 234.8 9.0415 -5.4134 1979-Aug 1979.625 235.2 8.9852 -5.5706 1979-Jul 1979.542 235.7 8.9734 -5.557 1979-Jun 1979.458 236.1 9.009 -5.4693 1979-May 1979.375 236.6 8.9463 -5.6236 1979-Apr 1979.292 237.3 8.9699 -5.3522 1979-Mar 1979.208 238.0 9.1073 -5.1815 1979-Feb 1979.125 238.4 9.1816 -5.0108 1979-Jan 1979.042 238.8 9.2281 -4.9098 1978-Dec 1978.958 239.7 9.2006 -5.0881 1978-Nov 1978.875 240.9 9.1298 -5.6335 1978-Oct 1978.792 242.1 9.0634 -4.9709 1978-Sep 1978.708 243.0 9.1331 -5.887 1978-Aug 1978.625 243.9 9.0128 -5.3911 1978-Jul 1978.542 244.8 9.0304 -5.6826 1978-Jun 1978.458 245.6 8.9945 -5.3038 1978-May 1978.375 246.5 8.9172 -5.3202 1978-Apr 1978.292 246.9 9.0114 -5.47 1978-Mar 1978.208 247.4 9.1406 -5.3517 1978-Feb 1978.125 248.0 9.2342 -5.2423 1978-Jan 1978.042 248.5 9.1617 -5.0069 1977-Dec 1977.958 248.9 9.152 -5.0319 1977-Nov 1977.875 249.4 9.0861 -5.3117 1977-Oct 1977.792 250.3 9.0168 -6.0039 1977-Sep 1977.708 251.2 9.0137 -5.9058 1977-Aug 1977.625 252.2 9.0389 -5.7119 1977-Jul 1977.542 253.1 9.0173 -5.1354 1977-Jun 1977.458 254.0 8.9111 -5.3477 1977-May 1977.375 254.6 8.935 -5.4206 1977-Apr 1977.292 255.3 9.0485 -5.3618 1977-Mar 1977.208 256.1 9.2029 -5.1435 1977-Feb 1977.125 256.8 9.2148 -4.923 1977-Jan 1977.042 257.2 9.1948 -4.9881