(PhysOrg.com) -- Climatologists have long known that human-produced greenhouse gases have been the dominant drivers of Earth's observed warming since the start of the Industrial Revolution. But other factors also affect our planet's temperature. Of these, the ocean plays a dominant role. Its effects helped nudge global temperatures slightly higher in 2009, and, according to NASA scientists, could well contribute to making 2010 the warmest year on record.


Covering 71 percent of our planet's surface, the ocean acts as a global thermostat, storing energy from the sun, keeping Earth's temperature changes moderate and keeping climate change gradual. In fact, the ocean can store as much heat in its top three meters (10 feet) as the entire atmosphere does.

"The vast amount of heat stored in the ocean regulates Earth's temperature, much as a flywheel regulates the speed of an engine," said Bill Patzert, an oceanographer and climatologist at NASA's Jet Propulsion Laboratory in Pasadena, Calif. "The ocean has a long history of capturing and giving up heat generated by both human activities and natural cycles; it is the thermal memory of the climate system."

Heat and moisture from the ocean are constantly exchanged with Earth's atmosphere in a process that drives our weather and climate. Scientists at NASA and elsewhere use a variety of direct and satellite-based measurements to study the interactions between the ocean and atmosphere.

"These interactions result in large-scale global climate effects, the largest of which is the El Niño-Southern Oscillation," explained Josh Willis, a JPL oceanographer and climate scientist. This climate pattern appears in the tropical Pacific Ocean roughly every four to 12 years and has a powerful impact on the ocean and the atmosphere. It can disrupt global weather and influence hurricanes, droughts and floods. It can also raise or lower global temperatures by up to 0.2 degrees Celsius (0.4 degrees Fahrenheit).

The oscillation pattern is made up of linked atmospheric and oceanic components. The atmospheric component is called the Southern Oscillation, a pattern of reversing surface air pressure that see-saws between the eastern and western tropical Pacific. The ocean's response to this atmospheric shift is known as either "El Niño" or "La Niña" (Spanish for "the little boy" and "the little girl," respectively). ... (Phys Org)