Study: Human Activity Affecting Ocean Temperatures In Hurricane Formation Regions
Rising sea surface temperatures (SSTs) in hurricane "breeding grounds" of the Atlantic and Pacific Oceans are unlikely to be purely natural in origin, the Lawrence Livermore National Laboratory (LLNL) reported on Sept. 11. Researchers said that the findings complement earlier work that uncovered compelling scientific evidence of a link between warming SSTs and increases in hurricane intensity.
Previous studies to understand the causes of SST changes have focused on temperature changes averaged over very large ocean areas -- such as the entire Atlantic or Pacific basins. The new research specifically targets SST changes in much smaller hurricane formation regions.
Using 22 different computer models of the climate system, atmospheric scientists from LLNL and 10 other research centers have shown that the warming of the tropical Atlantic and Pacific oceans over the last century is directly linked to human activities.
For the period 1906-2005, the researchers found an 84 percent chance that external forcing (such as human-caused increases in greenhouse gases, ozone and various aerosol particles) accounts for at least 67 percent of the observed rise in SSTs in the Atlantic and Pacific hurricane formation regions. In both regions, human-caused increases in greenhouse gases were found to be the main driver of the 20th century warming of SSTs.
We've used virtually all the world's climate models to study the causes of SST changes in hurricane formation regions," said Benjamin Santer of Livermore's Program for Climate Model Diagnosis and Intercomparison, lead author of a paper describing the research that appeared online in the Proceedings of the National Academy of Sciences.
Santer, in conjunction with Livermore colleagues Peter Gleckler, Krishna AchutaRao, Jim Boyle, Mike Fiorino, Steve Klein and Karl Taylor, collaborated with researchers from the National Center for Atmospheric Research, the University of California, Merced, Lawrence Berkeley National Laboratory, the Scripps Institution of Oceanography, the University of Hamburg in Germany, the Climatic Research Unit and Manchester University in the United Kingdom, the National Aeronautics and Space Administration (NASA)/Goddard Institute for Space Studies and the National Oceanic and Atmospheric Administration's (NOAA) National Climatic Data Center.
"In the real world, we're performing an uncontrolled experiment by burning fossil fuels and releasing greenhouse gases," Santer said. "We don't have a convenient parallel Earth with no human influence on climate. This is why our study relied on computer models for estimates of how the climate of an 'undisturbed Earth' might have evolved. The bottom line is that natural processes alone simply cannot explain the observed SST increases in these hurricane breeding grounds. The best explanation for these changes has to include a large human influence."
Hurricanes are complex phenomena and are influenced by a variety of physical factors such as SST, wind shear, moisture availability and atmospheric stability. The increasing SSTs in the Atlantic and Pacific hurricane formation regions isn't the sole cause of hurricane intensity, but is likely to be one of the most important influences on hurricane strength.
"The models that we've used to understand the causes of SST increases in these hurricane formation regions predict that the oceans are going to get a lot warmer over the 21st century," Santer said. "That causes some concern. In a post-Katrina world, we need to do the best job we possibly can to understand the complex influences on hurricane intensity, and how our actions are changing those influences."
Contact LLNL at http://www.llnl.gov.
On Sept. 13, scientists at NOAA's Climate Prediction Center reported today that El Niño conditions have developed in the tropical Pacific and are likely to continue into early 2007. Ocean temperatures increased remarkably in the equatorial Pacific during the last two weeks. NOAA officials stated that the development of weak El Niño conditions helps explain why this Atlantic hurricane season has been less active than was previously expected. For additional information, contact NOAA at http://www.noaa.gov.
This article originally appeared in the 09/01/2006 issue of Environmental Protection.