Letter: Vast losses of sea ice

Last modified: 1/3/2014 11:03:01 AM
The letter titled “About that warming” (Monitor, Jan. 1) pokes fun at climate researchers being stuck in ice in Antarctica. As NASA can confirm, there is less sea ice globally than 30 years ago; the small increase in overall ice in Antarctica does not compare to the vast losses in the Arctic.

Researchers at NASA, UCLA, and the University of Colorado have uncovered an increase in the westerly winds surrounding Antarctica, which has the effect of expanding the outer edge of sea ice. Scientific studies have also determined why the winds have accelerated.

First, global warming has changed temperature differences between the poles and equator, creating stronger winds. Second, ozone absorbs sunlight, and with the human-induced hole in the ozone layer, there’s a colder stratosphere over the southern pole, affecting wind patterns, according to University of New Zealand experts.

As the atmosphere contains 4 percent more water vapor than 30 years ago, increased precipitation is another factor. Science is amazing when we seek to understand it.

SUSAN SHAMEL

Hillsboro




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