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Antarctic climate cooling and terrestrial ecosystem response.

Peter T Doran1, John C Priscu, W Berry Lyons

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Summary

Antarctic surface temperatures show a surprising net cooling trend, contradicting global warming predictions. This cooling significantly impacts terrestrial ecosystems, decreasing lake productivity and soil invertebrate populations.

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Area of Science:

  • Environmental Science
  • Climate Science
  • Ecology

Background:

  • Global average surface temperatures have risen, with polar regions predicted to warm significantly.
  • Observed warming in the Antarctic Peninsula contrasts with potential continental cooling trends.
  • Previous reports indicated slight recent continental warming, necessitating further investigation.

Purpose of the Study:

  • To analyze spatial meteorological data across Antarctica to determine continental temperature trends.
  • To investigate the impact of observed cooling on Antarctic terrestrial ecosystems, particularly in the McMurdo Dry Valleys.
  • To assess the implications of Antarctic cooling for climate and ecosystem change models.

Main Methods:

  • Spatial analysis of Antarctic meteorological data from 1966 to 2000.
  • Examination of temperature trends in the McMurdo Dry Valleys from 1986 to 2000.
  • Assessment of primary lake productivity and soil invertebrate populations in response to cooling.

Main Results:

  • A net cooling trend was observed across the Antarctic continent between 1966 and 2000, especially during summer and autumn.
  • The McMurdo Dry Valleys experienced a cooling rate of 0.7 degrees C per decade from 1986 to 2000.
  • Terrestrial ecosystems showed rapid responses, including decreased lake primary productivity (6-9% annually) and declining soil invertebrates (>10% annually).

Conclusions:

  • Continental Antarctic cooling, particularly its seasonal patterns, challenges existing climate models.
  • Observed ecosystem responses highlight the sensitivity of Antarctic life to temperature shifts.
  • The findings underscore the need to refine climate and ecosystem change models to account for regional cooling trends in Antarctica.