New research led by the National Center for Atmospheric Research (NCAR) shows that when three atmospheric patterns came together over the Indian and Pacific oceans, they drove so much precipitation over Australia in 2010 and 2011 that the world’s ocean levels dropped measurably. Unlike other continents, the soils and topography of Australia prevent almost all of its precipitation from running off into the ocean.
The 2010-11 event temporarily halted a long-term trend of rising sea levels caused by higher temperatures and melting ice sheets.
Now that the atmospheric patterns have snapped back and more rain is falling over tropical oceans, the seas are rising again. In fact, with Australia in a major drought, they are rising faster than before.
“It’s a beautiful illustration of how complicated our climate system is,” says NCAR scientist John Fasullo, the lead author of the study. “The smallest continent in the world can affect sea level worldwide. Its influence is so strong that it can temporarily overcome the background trend of rising sea levels that we see with climate change.”
The study, with co-authors from NASA’s Jet Propulsion Laboratory and the University of Colorado at Boulder, has been published in Geophysical Research Letters. It was funded by the National Science Foundation (NSF), which is NCAR’s sponsor, and by NASA.
Consistent Rising, Interrupted
As the climate warms, the world’s oceans have been rising in recent decades by just more than 3 millimeters (0.1 inches) annually. This is partly because the heat causes water to expand, and partly because runoff from retreating glaciers and ice sheets is making its way into the oceans.
But for an 18-month period beginning in 2010, the oceans mysteriously dropped by about 7 millimeters (about 0.3 inches), more than offsetting the annual rise.
Fasullo and his co-authors published research last year demonstrating that the reason had to do with the increased rainfall over tropical continents. They also showed that the drop coincided with the atmospheric oscillation known as La Niña, which cooled tropical surface waters in the eastern Pacific and suppressed rainfall there while enhancing it over other portions of the tropical Pacific, Africa, South America, and Australia.
But an analysis of the historical record showed that past La Niña events only rarely accompanied such a pronounced drop in sea level.
Using a combination of satellite instruments and other tools, the new study finds that the picture in 2010-11 was uniquely complex. A rare combination of two other semi-cyclic climate modes came together to drive such large amounts of rain over Australia that the continent, on average, received almost one foot (300 millimeters) of rain more than average.
The initial effects of La Niña were to cool surface waters in the eastern Pacific Ocean and push moisture to the west. A climate pattern known as the Southern Annular Mode then coaxed the moisture into Australia’s interior, causing wide-spread flooding across the continent. Later in the event, high levels of moisture from the Indian Ocean driven by the Indian Ocean Dipole collided with La Niña-borne moisture in the Pacific and pushed even more moisture into the continent’s interior. Together, these influences spurred one of the wettest periods in Australia’s recorded history.
Australia’s vast interior, called the Outback, is ringed by coastal mountains and often quite dry. Because of the low-lying nature of the continent’s eastern interior and the lack of river runoff in its western dry environment, most of the heavy rainfall of 2010–11 remained inland rather than flowing into the oceans. While some of it evaporated in the desert sun, much of it sank into the dry, granular soil of the Western Plateau or filled the Lake Eyre basin in the east.
“No other continent has this combination of atmospheric set-up and topography,” Fasullo says. “Only in Australia could the atmosphere carry such heavy tropical rains to such a large area, only to have those rains fail to make their way to the ocean.”
Measuring the Difference
To conduct the research, the scientists turned to three cutting-edge observing instrument systems:
- NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites, which make detailed measurements of Earth’s gravity field. The satellites enable scientists to monitor changes in the mass of continents.
- The Argo global array of 3,000 free-drifting floats that measure the temperature and salinity of the upper 6,000 feet of the world’s oceans.