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Using Generative Art to Convey Past and Future Climate Transitions
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Published on: March 31, 2023

The Last Glacial Maximum.

Peter U Clark1, Arthur S Dyke, Jeremy D Shakun

  • 1Department of Geosciences, Oregon State University, Corvallis, OR 97331, USA. clarkp@onid.orst.edu

Science (New York, N.Y.)
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

The Last Glacial Maximum (LGM) occurred between 33,000 and 19,000 years ago, driven by climate changes. Deglaciation began around 19,000 years ago, leading to sea-level rise.

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Published on: October 26, 2019

Area of Science:

  • Paleoclimatology
  • Quaternary Geology
  • Glaciology

Background:

  • The timing and extent of the Last Glacial Maximum (LGM) are crucial for understanding past climate dynamics and ice sheet behavior.
  • Previous studies have provided estimates for LGM timing, but a comprehensive synthesis using a large dataset is needed.

Purpose of the Study:

  • To precisely constrain the timing of the LGM and subsequent deglaciation using a large compilation of geochronological data.
  • To investigate the relationship between climate forcings and ice sheet extent during the LGM.

Main Methods:

  • Analysis of 5704 radiocarbon (14C), Beryllium-10 (10Be), and Helium-3 (3He) ages.
  • Dating interval spans from 10,000 to 50,000 years ago (10-50 ka).

Main Results:

  • Ice sheets reached maximum extent between 33.0 and 26.5 ka in response to decreased northern summer insolation, cooler Pacific sea surface temperatures, and lower atmospheric CO2.
  • Ice sheets remained near their LGM positions from 26.5 to 19-20 ka.
  • Northern Hemisphere deglaciation initiated around 19-20 ka, linked to increased northern summer insolation and subsequent sea-level rise.
  • West Antarctic Ice Sheet deglaciation began between 14 and 15 ka, contributing to a significant sea-level rise around 14.5 ka.

Conclusions:

  • The LGM was a dynamic period with distinct phases of ice sheet growth, stability, and decay.
  • Climate forcings, particularly insolation changes, played a key role in driving LGM and deglaciation timing.
  • The study refines the timeline of LGM and deglaciation, improving our understanding of Earth's climate system response to forcing.