# Global Database of Borehole Temperatures and Climate Reconstructions - IN-B6 #--------------------------------------------------------------- # 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/1000561 # Online_Resource: http://www.earth.lsa.umich.edu/climate/RECONSTRUCTION/IN-B6.html # # Archive: Borehole # # Parameter_Keywords: reconstruction #------------------------- # Contribution_Date # Date: 2016-10-16 #------------------------- # Title # Study_Name: Global Database of Borehole Temperatures and Climate Reconstructions - IN-B6 #------------------------- # 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-B6 # Location: India # Northernmost_Latitude: 13.19 # Southernmost_Latitude: 13.19 # Easternmost_Longitude: 77.82 # Westernmost_Longitude: 77.82 # Elevation: #------------------------- # Data_Collection # Collection_Name: IN-B6-borehole # Earliest_Year: 1500 # Most_Recent_Year: 199 # Time_Unit: AD # Core_Length: # Notes: Data Contact: S. Roy (IN) # Pre-1500 Baseline GST (oC): 26.638 # Date (Century) Rate of GST Change(K/100a) # 16th 0.243 # 17th 0.297 # 18th 0.361 # 19th 0.362 # 20th 0.193 # Date of logging (Year): 1988 # Thermal Conductivity (W/m/K): 4.00 # Geothermal Gradient (K/km): 9.12 # #------------------------- # 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 21.00 27.886 24.00 27.915 27.00 27.932 30.00 27.940 33.00 27.946 36.00 27.952 39.00 27.952 42.00 27.955 45.00 27.958 48.00 27.961 51.00 27.969 54.00 27.975 57.00 27.978 60.00 27.984 63.00 27.989 66.00 27.995 69.00 28.004 72.00 28.015 75.00 28.024 78.00 28.033 81.00 28.039 84.00 28.044 87.00 28.053 90.00 28.065 93.00 28.073 96.00 28.082 99.00 28.091 102.00 28.099 105.00 28.108 108.00 28.123 111.00 28.128 114.00 28.140 117.00 28.149 120.00 28.163 123.00 28.175 126.00 28.189 129.00 28.201 132.00 28.213 135.00 28.227 138.00 28.242 141.00 28.259 144.00 28.271 147.00 28.286 150.00 28.297 153.00 28.314 156.00 28.332 159.00 28.359 162.00 28.371 165.00 28.385 168.00 28.400 171.00 28.421 174.00 28.438 177.00 28.459 180.00 28.479 183.00 28.497 186.00 28.518 189.00 28.541 192.00 28.556 195.00 28.577 198.00 28.601 201.00 28.621 204.00 28.645 207.00 28.669 210.00 28.690 213.00 28.738 216.00 28.732 219.00 28.755 222.00 28.776 225.00 28.800 228.00 28.821 231.00 28.845 234.00 28.869 237.00 28.896 240.00 28.923 243.00 28.941 246.00 28.971