# Global Database of Borehole Temperatures and Climate Reconstructions - AU-VB12_010 #--------------------------------------------------------------- # 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/1004866 # Online_Resource: http://www.earth.lsa.umich.edu/climate/RECONSTRUCTION/AU-VB12_010.html # # Archive: Borehole # # Parameter_Keywords: reconstruction #------------------------- # Contribution_Date # Date: 2016-10-16 #------------------------- # Title # Study_Name: Global Database of Borehole Temperatures and Climate Reconstructions - AU-VB12_010 #------------------------- # 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-VB12_010 # Location: Australia # Northernmost_Latitude: -14.1332 # Southernmost_Latitude: -14.1332 # Easternmost_Longitude: 132.1051 # Westernmost_Longitude: 132.1051 # Elevation: #------------------------- # Data_Collection # Collection_Name: AU-VB12_010-borehole # Earliest_Year: 1500 # Most_Recent_Year: 2013 # Time_Unit: AD # Core_Length: # Notes: Data Contact: Kirkby AL (AU) # Pre-1500 Baseline GST (oC): 31.38 # Date (Century) Rate of GST Change(K/100a) # 16th 0.196 # 17th 0.126 # 18th -0.030 # 19th -0.343 # 20th -1.185 # Date of logging (Year): 2012.428 # Thermal Conductivity (W/m/K): 3.79 # Geothermal Gradient (K/km): 17.82 # #------------------------- # 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 32.311 70.00 32.421 75.00 32.543 80.00 32.661 85.00 32.775 90.00 32.886 95.00 32.993 100.00 33.096 105.00 33.204 110.00 33.310 115.00 33.408 120.00 33.507 125.00 33.610 130.00 33.708 135.00 33.803 140.00 33.901 145.00 34.006 150.00 34.104 155.00 34.205 160.00 34.308 165.00 34.402 170.00 34.493 175.00 34.574 180.00 34.657 185.00 34.730 190.00 34.813 195.00 34.894 200.00 34.978 205.00 35.058 210.00 35.145 215.00 35.233 220.00 35.316 225.00 35.404 230.00 35.502 235.00 35.596 240.00 35.690 245.00 35.786 250.00 35.871 255.00 35.962 260.00 36.055 265.00 36.145 270.00 36.234 275.00 36.321 280.00 36.405 285.00 36.486 290.00 36.573 295.00 36.659 300.00 36.747 305.00 36.829 310.00 36.918 315.00 37.005 320.00 37.097 325.00 37.190 330.00 37.279 335.00 37.370 340.00 37.458 345.00 37.548 350.00 37.629 355.00 37.716 360.00 37.818 365.00 37.902 370.00 37.977 375.00 38.066 380.00 38.163 385.00 38.248 390.00 38.339 395.00 38.432 400.00 38.520 405.00 38.606 410.00 38.698 415.00 38.786 420.00 38.871 425.00 38.962 430.00 39.048 435.00 39.139 440.00 39.230 445.00 39.315 450.00 39.401 455.00 39.493 460.00 39.576 465.00 39.666 470.00 39.753 475.00 39.844 480.00 39.938 485.00 40.028 490.00 40.119 495.00 40.217 500.00 40.312