# Global Database of Borehole Temperatures and Climate Reconstructions - IN-B16 #--------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #--------------------------------------------------------------- # # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/1000558 # Online_Resource: http://www.earth.lsa.umich.edu/climate/RECONSTRUCTION/IN-B16.html # # Archive: Borehole # # Parameter_Keywords: reconstruction #------------------------- # Contribution_Date # Date: 2016-10-16 #------------------------- # Title # Study_Name: Global Database of Borehole Temperatures and Climate Reconstructions - IN-B16 #------------------------- # Investigators # Investigators: Huang, S.; Pollack, H.N.; Shen, P.Y. #------------------------- # Description_Notes_and_Keywords # Description: This project has as its goal the design, assembly, analysis and interpretation of geothermal observations on # continents relevant to understanding the nature and causes of climate change over the past five centuries. The project was # inititated by the Geothermal Laboratory of the University of Michigan, USA. Important collaborations have been developed # with the Geophysical Institute of the Czech Academy of Sciences, and with a working group of the International Heat Flow # Commission of IASPEI. Funding for this project has come from the U.S. National Science Foundation, the U.S. National # Oceanic and Atmospheric Administration, the International Geological Correlation Program, and the Czech - U.S. Science and # Technology Program. The principal components of the database are: # (1) Basic geothermal observations from field surveys and laboratory measurements, principally comprising borehole # temperature logs and thermophysical properties. This section includes data only from boreholes at least 200 m deep. The # data listed are restricted to the range 20-600 meters. Data above 20 m have been omitted because they include annual # variability, and data below 600 m have not been included because they contain no information about the past 500 # years.Quality control measures have occasionally required the deletion of other data within the 20-600 m range. # (2) A five-century ground surface temperature history derived for each site by a standardized inversion procedure # operating on the basic observations. The derived history is presented as century-long temperature trends for each of the # past five centuries. This representation emphasizes longer term variations of the climate history, and thus is # complementary to high resolution proxies such as tree rings, ice cores, corals and lake sediments. # (3) The name of the person who can be contacted to learn more about the data and the site. This is either the name of the # original investigator who made the observations, or the name of a regional or national data compiler. Some data remain # proprietary, and therefore are not accessible directly from this database. Database users desiring access to these data # should request the data directly from the person listed as the data contact. A list of investigators engaged in climate # studies involving geothermal data can be found at the original web site of this database at the University of Michigan. # # Updated version of dataset submitted by Huang in October 2016. #-------------------- # Publication # Authors: Huang, S., Pollack, H. N., and Shen, P.Y. # Published_Date_or_Year: 2000-02-17 # Published_Title: Temperature trends over the past five centuries reconstructed from borehole temperatures # Journal_Name: Nature # Volume: 403 # Edition: # Issue: # Pages: 756-758 # DOI: 10.1038/35001556 # Abstract: For an accurate assessment of the relative roles of natural variability and anthropogenic influence in the Earth's climate, reconstructions of past temperatures from the pre-industrial as well as the industrial period are essential. But instrumental records are typically available for no more than the past 150 years. Therefore reconstructions of pre-industrial climate rely principally on traditional climate proxy records, each with particular strengths and limitations in representing climatic variability. Subsurface temperatures comprise an independent archive of past surface temperature changes that is complementary to both the instrumental record and the climate proxies. Here we use present-day temperatures in 616 boreholes from all continents except Antarctica to reconstruct century-long trends in temperatures over the past 500 years at global, hemispheric and continental scales. The results confirm the unusual warming of the twentieth century revealed by the instrumental record6, but suggest that the cumulative change over the past five centuries amounts to about 1 K, exceeding recent estimates from conventional climate proxies. The strength of temperature reconstructions from boreholes lies in the detection of long-term trends, complementary to conventional climate proxies, but to obtain a complete picture of past warming, the differences between the approaches need to be investigated in detail. #---------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 1202673 #---------------------- # Site_Information # Site_Name: IN-B16 # Location: India # Northernmost_Latitude: 13.12 # Southernmost_Latitude: 13.12 # Easternmost_Longitude: 77.19 # Westernmost_Longitude: 77.19 # Elevation: #------------------------- # Data_Collection # Collection_Name: IN-B16-borehole # Earliest_Year: 1500 # Most_Recent_Year: 200 # Time_Unit: AD # Core_Length: # Notes: Data Contact: S. Roy (IN) # Pre-1500 Baseline GST (oC): 26.397 # Date (Century) Rate of GST Change(K/100a) # 16th 0.287 # 17th 0.318 # 18th 0.315 # 19th 0.176 # 20th -0.099 # Date of logging (Year): 1994 # Thermal Conductivity (W/m/K): 3.10 # Geothermal Gradient (K/km): 8.15 # #------------------------- # Chronology_Information # Chronology: #------------------------- # Variables # # Data variables follow (marked with '##') # Variables list: shortname-tab- 9 components: what, material, error, units, seasonality, archive, detail, method, Temperature for Character or Numeric data ## depth_m depth,,, m,,,below surface,,N ## temp_meas temperature,,,degrees Celsius,,borehole,measured,,N #------------------------- # Data: # Missing Values: NA depth_m temp_meas 30.00 27.524 33.00 27.532 36.00 27.532 39.00 27.541 42.00 27.547 45.00 27.552 48.00 27.558 51.00 27.561 54.00 27.572 57.00 27.575 60.00 27.581 63.00 27.589 66.00 27.598 69.00 27.606 72.00 27.615 75.00 27.623 78.00 27.637 81.00 27.646 84.00 27.654 87.00 27.663 90.00 27.671 93.00 27.683 96.00 27.691 99.00 27.703 102.00 27.708 105.00 27.725 108.00 27.734 111.00 27.745 114.00 27.757 117.00 27.765 120.00 27.785 123.00 27.794 126.00 27.808 129.00 27.820 132.00 27.834 135.00 27.848 138.00 27.863 141.00 27.877 144.00 27.889 147.00 27.903 150.00 27.920 153.00 27.935 156.00 27.949 159.00 27.963 162.00 27.981 165.00 27.992 168.00 28.010 171.00 28.027 174.00 28.041 177.00 28.059 180.00 28.073 183.00 28.088 186.00 28.105 189.00 28.120 192.00 28.137 195.00 28.154 198.00 28.169 201.00 28.189 204.00 28.210 207.00 28.227 210.00 28.245 213.00 28.265 216.00 28.283 219.00 28.297 222.00 28.318 225.00 28.335 228.00 28.356 231.00 28.379 234.00 28.400 237.00 28.421 240.00 28.444 243.00 28.465 246.00 28.488 249.00 28.512 252.00 28.530 255.00 28.556 258.00 28.577 261.00 28.598 264.00 28.619 267.00 28.639 270.00 28.663 273.00 28.684 276.00 28.711 279.00 28.732 282.00 28.758 285.00 28.782 288.00 28.797 291.00 28.824