Mauna Kea Boulder Evidence
Boulders deposited by an ancient glacier that once covered the summit of Mauna Kea on the island of Hawaii
have provided more evidence of the extraordinary power and reach of global change, particularly the slowdown
of a North Atlantic Ocean current system that could happen again and continues to be a concern to climate scientists.
A new study has found geochemical clues near the summit of Mauna Kea that tell a story of ancient glacier formation,
the influence of the most recent ice age, more frequent major storms in Hawaii, and the impact of a distant climatic
event that changed much of the world.
The research was published in Earth and Planetary Science Letters by scientists from Oregon State University, the
Woods Hole Oceanographic Institution, University of British Columbia and U.S. Geological Survey. The work was
supported by the National Science Foundation.
The Mauna Kea Ice Cap
"Mauna Kea had a large glacial ice cap of about 70 square kilometers until 14,500 years ago, which has now all disappeared,"
said Peter Clark, a professor of geosciences at OSU. "We've been able to use new data to determine specifically when, where
and most likely why the glacier existed and then disappeared."
Mauna Kea, at 13,803 feet above sea level, is in a sense the tallest mountain in the world because it rises 30,000 feet
from the sea floor. Dormant for thousands of years, it once featured a large glacier on its massive peak at the height
of the last ice age about 21,000 years ago. As the ice age ended and the global climate warmed, the glacier began to disappear.
Mauna Kea Re-Advance and the AMOC
However, the new research found that the glacier on Mauna Kea began to re-advance to almost its ice age size about
15,400 years ago. That coincides almost exactly with a major slowdown of what scientists call the Atlantic meridional
overturning circulation, or AMOC, in the North Atlantic Ocean.
The AMOC is part of a global ocean circulation system that carries heat from the tropics to the North Atlantic. This
transported heat is the primary reason that much of Europe is warmer in the winter than would be expected, given the
latitude of the continent.
Studies of past climate change indicate that the AMOC has slowed a number of times, in surprisingly short periods, causing
substantial cooling of Europe. Because of that, the potential future decline of the current is of considerable interest.
Global Impact of the AMOC
But scientists have found that the AMOC does more than just keep northern Europe habitable. Its effects can extend far beyond that.
"The new data from Mauna Kea, along with other findings from geological archives preserved in oceans and lakes in many other areas,
show that the decline of the AMOC basically caused climate changes all over the world," Clark said. "These connections are pretty
remarkable, a current pattern in the North Atlantic affecting glacier development thousands of miles away in the Hawaiian Islands.
"The global impact of the AMOC changes," Clark added, "was just massive."
The formation, size and movement of glaciers can provide valuable data, he said, because these characteristics reflect current
and historic changes in temperature, precipitation or both.
Huge Precipitation Increase
The study concludes that the growth of the Mauna Kea glacier caused by the AMOC current changes was a result of both colder
conditions and a huge increase of precipitation on Mauna Kea - triple that of the present - that scientists believe may have
been caused by more frequent cyclonic storm events hitting the Hawaiian Islands from the north.
Helium Isotope Studies
The findings were supported by measurements of an isotope of helium being produced in boulders left by the Mauna Kea glacier
thousands of years ago. The amount of this helium isotope reveals when the boulders were finally uncovered by ice and exposed
to the atmosphere.
The deposits containing the boulders are the only record of glaciation in the northern subtropical Pacific Ocean. Nearby Mauna
Loa probably also was glaciated, but evidence of its glaciation has since been destroyed by volcanic eruptions.
The study by Clark and colleagues provides additional evidence that rapid changes in the AMOC can trigger widespread global change.
Some past abrupt decreases in the AMOC have been linked to an increase of freshwater flowing off the continents into the North Atlantic.
Future Climate Impact of the AMOC
The potential under global warming for increases in freshwater from melting ice and changes in precipitation patterns have
heightened concerns about the AMOC and related climate effects in the future, researchers said.
The OSU College of Science
About the OSU College of Science: As one of the largest academic units at OSU, the College of Science has 14 departments and programs,
13 pre-professional programs, and provides the basic science courses essential to the education of every OSU student. Its faculty are
international leaders in scientific research.
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| Gray rubble on the flanks of Mauna Kea on the island of Hawaii lie in contrast to the red volcanic rock behind them, and were deposited by a glacier that disappeared thousands of years ago. Photo courtesy of Oregon State University. |
| Peter Clark, a professor of geosciences at Oregon State University, stands in a field of glacial debris on the mountain of Mauna Kea in Hawaii, left there by an ancient glacier. Photo courtesy of Oregon State University. |
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