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Climate change record in subsurface temperatures: A global perspective

Pollack1, Huang, Shen

  • 1H. N. Pollack and S. Huang, Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA. P.-Y. Shen, Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada.

Science (New York, N.Y.)
|October 9, 1998
PubMed
Summary

Earth

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Area of Science:

  • Geophysics
  • Climate Science
  • Earth Sciences

Background:

  • Global climate change is a significant area of scientific research.
  • Understanding historical climate trends is crucial for current climate modeling.

Purpose of the Study:

  • To analyze underground temperature measurements to reconstruct past surface temperatures.
  • To independently verify recent findings on 20th-century warming.

Main Methods:

  • Analysis of temperature data from 358 boreholes across four continents.
  • Geothermal data interpretation to infer historical surface temperature changes.

Main Results:

  • Earth's average surface temperature increased by approximately 0.5°C in the 20th century.
  • The 20th century was the warmest in the last 500 years.
  • Subsurface temperatures indicate a 1.0°C warming over the past five centuries.

Conclusions:

  • Geothermal data provide independent evidence of significant 20th-century climate warming.
  • The findings corroborate multiproxy studies on unusual 20th-century climate conditions.

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