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Related Experiment Videos

Abrupt decrease in tropical Pacific sea surface salinity at end of Little Ice Age.

Erica J Hendy1, Michael K Gagan, Chantal A Alibert

  • 1Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia. erica.hendy@anu.edu.au

Science (New York, N.Y.)
|February 23, 2002
PubMed
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Coral isotope analysis reveals higher 18th-century sea surface temperatures and salinity in the Great Barrier Reef. Abrupt freshening after 1870 coincided with tropical cooling, potentially impacting the Little Ice Age.

Area of Science:

  • Paleoclimatology
  • Marine geochemistry

Background:

  • Coral skeletons record past ocean conditions through isotope ratios.
  • Understanding long-term climate variability is crucial for predicting future changes.

Purpose of the Study:

  • To reconstruct sea surface temperature and salinity over the past 420 years in the Great Barrier Reef.
  • To investigate the drivers of past climate shifts, including the Little Ice Age.

Main Methods:

  • Analysis of strontium/calcium, uranium/calcium, and oxygen isotope ratios in eight coral cores.
  • Dating of coral cores to establish a precise chronological framework.

Main Results:

  • Sea surface temperature and salinity were higher in the 18th century compared to the 20th century.

Related Experiment Videos

  • An abrupt freshening event occurred across the southwestern Pacific after 1870, linked to tropical cooling.
  • Higher salinities from 1565 to 1870 suggest advection and wind-induced evaporation due to temperature gradients and intensified circulation.

    • Conclusions:

    • Past climate variations in the Great Barrier Reef provide insights into broader Pacific and global climate dynamics.
    • Intensified poleward water vapor transport from the tropical Pacific may have contributed to the Little Ice Age glacial expansion.