John Roach for National Geographic News Scientists
have identified a few suspects behind the Earth's sudden weight gain
around the Equator: glacial melt and shifting ocean mass.
"It is
quite striking that we are able to explain the [change] with oceans and
glaciers," said Jean Dickey, a research scientist at NASA's Jet
Propulsion Laboratory in Pasadena, California.
Both El Niño and PDO
involve a periodic warming of ocean currents. El Niño effects are
concentrated primarily in the southern oceans, while PDO is observed in
the northern.
Dickey's team created a computer model
of the pressure exerted by the oceans on the Earth in the years before
and after the El Niño and PDO events and found a pronounced shift in
oceanic mass towards the Equator, said Dickey.
http://news.nationalgeographic.com/news/2002/12/1205_021205_oblateearth.html
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