# Global Database of Borehole Temperatures and Climate Reconstructions - AU-AB56 #--------------------------------------------------------------- # 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/1004839 # Online_Resource: http://www.earth.lsa.umich.edu/climate/RECONSTRUCTION/AU-AB56.html # # Archive: Borehole # # Parameter_Keywords: reconstruction #------------------------- # Contribution_Date # Date: 2016-10-16 #------------------------- # Title # Study_Name: Global Database of Borehole Temperatures and Climate Reconstructions - AU-AB56 #------------------------- # 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-AB56 # Location: Australia # Northernmost_Latitude: -24.6436 # Southernmost_Latitude: -24.6436 # Easternmost_Longitude: 118.5841 # Westernmost_Longitude: 118.5841 # Elevation: #------------------------- # Data_Collection # Collection_Name: AU-AB56-borehole # Earliest_Year: 1500 # Most_Recent_Year: 2011 # Time_Unit: AD # Core_Length: # Notes: Data Contact: Gerner EJ (AU) # Pre-1500 Baseline GST (oC): 27.28 # Date (Century) Rate of GST Change(K/100a) # 16th -0.937 # 17th -0.435 # 18th 0.270 # 19th 0.863 # 20th 1.084 # Date of logging (Year): 2010.569 # Thermal Conductivity (W/m/K): 4.50 # Geothermal Gradient (K/km): 18.21 # #------------------------- # 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 65.00 28.275 70.00 28.376 75.00 28.440 80.00 28.511 85.00 28.602 90.00 28.688 95.00 28.753 100.00 28.862 105.00 28.955 110.00 29.035 115.00 29.071 120.00 29.226 125.00 29.278 130.00 29.415 135.00 29.481 140.00 29.550 145.00 29.568 150.00 29.644 155.00 29.723 160.00 29.863 165.00 30.010 170.00 30.112 175.00 30.257 180.00 30.309 185.00 30.343 190.00 30.502 195.00 30.537 200.00 30.661 205.00 30.782 210.00 30.855 215.00 30.996 220.00 31.119 225.00 31.199 230.00 31.261 235.00 31.381 240.00 31.447 245.00 31.516 250.00 31.681 255.00 31.762 260.00 31.856 265.00 31.948 270.00 32.058 275.00 32.181 280.00 32.275 285.00 32.344 290.00 32.448 295.00 32.556 300.00 32.655 305.00 32.727 310.00 32.822 315.00 32.929 320.00 33.057 325.00 33.173 330.00 33.273 335.00 33.382 340.00 33.518 345.00 33.614 350.00 33.674 355.00 33.749 360.00 33.798 365.00 33.880 370.00 33.950 375.00 34.038 380.00 34.157 385.00 34.236 390.00 34.361 395.00 34.465 400.00 34.558 405.00 34.624 410.00 34.721 415.00 34.810 420.00 34.916 425.00 34.988 430.00 35.084 435.00 35.207 440.00 35.309 445.00 35.421 450.00 35.495 455.00 35.589 460.00 35.694 465.00 35.771 470.00 35.847 475.00 35.923 480.00 35.981 485.00 36.047 490.00 36.132 495.00 36.199 500.00 36.285