A new spin on global warming.
Richard S. Gross and his colleagues at the Jet Propulsion Laboratory in Pasadena, Calif., analyzed the seasonal changes in day length over the last 30 years. Whereas scientists think that rearrangements of matter inside the Earth cause longer-term shifts in rotational speed, the seasonal changes are thought to occur because of variations in the strength of winds.
Gross and his colleagues found that the seasonal fluctuations in day length over the last three decades correlate with the Southern Oscillation Index- an atmospheric pressure pattern in the Pacific associated with El Nino warming. This suggests that scientists can use the alterations in day length to monitor long-term changes in the atmosphere, particularly the strength of winds that blow around the globe, Gross says.
|Printer friendly Cite/link Email Feedback|
|Title Annotation:||fluctuations in the earth's rotation rate may provide a method for monitoring global warming|
|Article Type:||Brief Article|
|Date:||Dec 18, 1993|
|Previous Article:||Digging up the dirt on Mauna Loa.|
|Next Article:||Joint motion by number.|