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This photo, taken from space, shows the Southeast Pacific Ocean on the left, with patches of stratocumulus clouds along the coast of South American. Moving to the right (east) one can see the low lying coastal Atacama Desert and the Andes Mountain Range.
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Image Courtesy of NASA

What are VOCALS' scientific questions?

Scientists in the VOCALS program seek to better understand the climate in the Southeast Pacific (SEP) Ocean region and the global climate system. The scientists wonder how changes in the oceans impact the characteristics of the lower atmosphere and the clouds that are found there. They also seek to understand how the oceans affect the clouds and atmosphere.

Scientific questions can be answered by doing experiments in the field as well as in the laboratory. The VOCALS scientists are focused on two general goals: (1) testing how precipitation known as know as drizzle affects the structure and coverage of stratus clouds. (This question includes understanding how aerosols, sometimes in air pollution, affect how the precipitation forms), and (2) testing how the ocean, atmosphere, and land interact with each other in the SEP region.

In addition to exploring these questions, the VOCALS observations will be used to find out how accurate satellite observations are of the region. This is done by comparing satellite data collected miles above Earth with measurements made by instruments on ships, on airplanes, and at stations on land. Scientists will then be able to explore how well their models of interactions in the atmosphere and oceans represent the weather and climate in the region. This is very important to understanding what role the SEP plays in the larger global climate system.

Last modified October 7, 2008 by Susan Foster.

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