# Global Database of Borehole Temperatures and Climate Reconstructions - AU-SED246 #--------------------------------------------------------------- # 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/1004854 # Online_Resource: http://www.earth.lsa.umich.edu/climate/RECONSTRUCTION/AU-SED246.html # # Archive: Borehole # # Parameter_Keywords: reconstruction #------------------------- # Contribution_Date # Date: 2016-10-16 #------------------------- # Title # Study_Name: Global Database of Borehole Temperatures and Climate Reconstructions - AU-SED246 #------------------------- # 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: AU-SED246 # Location: Australia # Northernmost_Latitude: -32.7215 # Southernmost_Latitude: -32.7215 # Easternmost_Longitude: 119.8138 # Westernmost_Longitude: 119.8138 # Elevation: #------------------------- # Data_Collection # Collection_Name: AU-SED246-borehole # Earliest_Year: 1500 # Most_Recent_Year: 2011 # Time_Unit: AD # Core_Length: # Notes: Data Contact: Kirkby AL (AU) # Pre-1500 Baseline GST (oC): 18.86 # Date (Century) Rate of GST Change(K/100a) # 16th 0.006 # 17th 0.042 # 18th 0.063 # 19th 0.016 # 20th 0.140 # Date of logging (Year): 2010.339 # Thermal Conductivity (W/m/K): 3.03 # Geothermal Gradient (K/km): 11.30 # #------------------------- # 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 19.759 35.00 19.739 40.00 19.677 45.00 19.684 50.00 19.689 55.00 19.735 60.00 19.778 65.00 19.815 70.00 19.807 75.00 19.844 80.00 19.908 85.00 19.954 90.00 20.002 95.00 20.044 100.00 20.088 105.00 20.131 110.00 20.172 115.00 20.220 120.00 20.272 125.00 20.326 130.00 20.387 135.00 20.448 140.00 20.499 145.00 20.556 150.00 20.613 155.00 20.662 160.00 20.709 165.00 20.751 170.00 20.831 175.00 20.873 180.00 20.917 185.00 20.969 190.00 21.017 195.00 21.068 200.00 21.121 205.00 21.177 210.00 21.233 215.00 21.288 220.00 21.345 225.00 21.399 230.00 21.454 235.00 21.511 240.00 21.571 245.00 21.626 250.00 21.683 255.00 21.744 260.00 21.798 265.00 21.853 270.00 21.906 275.00 21.965 280.00 22.019 285.00 22.073 290.00 22.123 295.00 22.192 300.00 22.252 305.00 22.308 310.00 22.367 315.00 22.432 320.00 22.483 325.00 22.526 330.00 22.594 335.00 22.658 340.00 22.728 345.00 22.772 350.00 22.821 355.00 22.872 360.00 22.931 365.00 22.983 370.00 23.058 375.00 23.099 380.00 23.136 385.00 23.201 390.00 23.256 395.00 23.316 400.00 23.375 405.00 23.431 410.00 23.489 415.00 23.554 420.00 23.610 425.00 23.665 430.00 23.718 435.00 23.773 440.00 23.828 445.00 23.880 450.00 23.928 455.00 23.984 460.00 24.060 465.00 24.108 470.00 24.167 475.00 24.223 480.00 24.272 485.00 24.323 490.00 24.400 495.00 24.451 500.00 24.503