Missing Heat Hides From Climate Scientists
By Doug L. Hoffman
Climate scientists have decided that as much as half of the heat energy, believed to have built up on Earth in recent years, is hiding somewhere it can’t be found.
By measuring the radiative energy input at the top of Earth’s atmosphere, scientists have a pretty good idea of how much energy is entering the planetary environment—the problem is figuring out where it goes. The most likely place is in the deep ocean, whose waters form a huge potential storage place for heat. Because energy is exchanged between the atmosphere and the ocean, this heat can resurface at a later time to affect weather and climate on a global scale. It has been suggested that last year’s rapidly occurring El Niño may be one way the “missing” solar energy has reappeared—the implication being more sudden El Niño events may be on the way.
Oceans contain around 80% of the climate system’s total energy, so ocean heat is a good measure of what is happening with Earth’s climate. According to a Perspectives article in the April 16, 2010, issue of Science, “Tracking Earth’s Energy,” science has been unable to properly track energy within Earth’s environmental system. Kevin E. Trenberth and John T. Fasullo , both scientists at the National Center for Atmospheric Research (NCAR), warn in the new study that satellite sensors, ocean floats, and other instruments are inadequate to track this “missing” heat. They fear that it may be building up in the deep oceans or elsewhere in the climate system. “The heat will come back to haunt us sooner or later,” says Trenberth, the lead author. “The reprieve we’ve had from warming temperatures in the last few years will not continue. It is critical to track the build-up of energy in our climate system so we can understand what is happening and predict our future climate.”
As noted on the NCAR site, a Science Perspectives piece is not formally peer-reviewed, but is reviewed by editors of the journal. Science reportedly invited Trenberth to submit the article after an editor heard him discuss the research at a scientific conference. Trenberth and his co-author, Fasullo, focused on what they call a central mystery of climate change. Why, since 2003, have scientists been unable to determine where much heat energy Earth receives from the Sun is going. According to the NCAR site:
Satellite measurements indicate that the amount of greenhouse-trapped solar energy has risen over recent years while the increase in heat measured in the top 3,000 feet of the ocean has stalled. Although it is difficult to quantify the amount of solar energy with precision, Trenberth and Fasullo estimate that, based on satellite data, the amount of energy build-up appears to be about 1.0 watts per square meter or higher, while ocean instruments indicate a build-up of about 0.5 watts per square meter. That means about half the total amount of heat is unaccounted for.
Either the satellite observations are incorrect, says Trenberth, or large amounts of heat are penetrating to regions on Earth that are not adequately measured. One such place is the deepest parts of the oceans. Compounding the problem, Earth’s surface temperatures have largely leveled off in recent years. This inability to properly track energy has implications for understanding the way climate works and most definitely on predicting future climate. Obviously, if scientists are at a loss to identify the hiding place of the missing heat climate modelers are unable to include its possible future effects in their programs. With as much as half of the suspected heat energy buildup gone missing, it must be asked how well science understands Earth’s climate...
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http://alethonews.wordpress.com/2010/04/19/missing-heat-hides-from-climate-scientists/
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