SAN FRANCISCO, CA--Future increases in wind strength along the California coast may have far-reaching effects, including more intense upwelling of cold water along the coast early in the season and increased fire danger in Southern California, according to researchers at the Climate Change and Impacts Laboratory at the University of California, Santa Cruz.
Earth scientist Mark Snyder will present the findings in a poster titled "Future Changes in Surface Winds in the Western U.S. due to Climate Change" at the Fall Meeting of the American Geophysical Union (AGU) in San Francisco on Friday, December 19.
Snyder's group used a regional climate model to study how the climate along the U.S. West Coast might change in the future as a result of global warming driven by increasing atmospheric concentrations of greenhouse gases. The results suggest that a general increase in wind speeds along the coast is likely to accompany regional changes in climate.
"What we think is going on is that land temperatures are increasing at a faster rate than the ocean temperatures, and this thermal gradient between the land and the ocean is driving increased winds," Snyder said.
The researchers conducted multiple runs of their regional model to compare simulations of the coastal climate for two time periods: 1968 to 2000 ("modern climate") and 2038 to 2070 ("future climate"). The regional model was driven by input from the global climate models used in the most recent report of the Intergovernmental Panel on Climate Change (IPCC AR4). The future climate projections were based on a "high-growth" emissions scenario (A2) thought to provide an upper range of possible future climates, although Snyder noted that recent global carbon dioxide emissions have exceeded even the highest projections of earlier IPCC reports.
The results showed increases in wind speeds of up to 2 meters per second, which is a large change in relation to current average wind
|Contact: Tim Stephens|
University of California - Santa Cruz