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Drilling Industry News

Satellite Tracks Earth's Water

February 15, 2007
For the first time, scientists have used a satellite to track the origin and movements of water vapor throughout Earth's atmosphere, providing a new perspective on the dominant role Earth's water cycle plays in weather and climate.

A team of scientists from the University of Colorado at Boulder and NASA's Jet Propulsion Laboratory in Pasadena, Calif., used the Tropospheric Emission Spectrometer on NASA's Aura satellite to gather data on "heavy" and "light" water vapor in order to retrace the history of water over oceans and continents, from ice and liquid to vapor and back again.

The researchers were able to distinguish between the two because heavy water vapor molecules have more neutrons than lighter ones do. By analyzing the distribution of the heavy and light molecules, the team was able to deduce the sources and processes that cycle water, the most abundant greenhouse gas in Earth's atmosphere, says David Noone of CU-Boulder's Cooperative Institute for Research in Environmental Sciences, an assistant professor in CU-Boulder's atmospheric and oceanic sciences department, and a corresponding author of a paper on the subject that appears in a recent issue of Nature.

The team found that tropical rainfall evaporation and water "exhaled" by forests are key sources of moisture to the tropical atmosphere. The researchers noted that much more water than expected is transported into the lower troposphere over land than over oceans, especially over the Amazon River basin and in tropical Africa.

"One might expect most of the water to come directly from the wet ocean," reveals Noone. "Instead, it appears that thunderstorm activity over the tropical continents plays a key role in keeping the troposphere hydrated."

The team found that in the tropics and regions of tropical rain clouds, rainfall evaporation significantly adds moisture to the lower troposphere, with typically 20 percent and up to 50 percent of rain there evaporating before it reaches the ground. "This mechanism allows the atmosphere to retain some of the water, which can be used later, for instance, to make clouds," Noone explains.

The strength and location of such evaporation gives scientists new insights into how water in Earth's atmosphere helps move energy from Earth's surface upward, important since the main role of the atmosphere in Earth's climate system is to take energy deposited by the sun and return it to space, says Noone.

The team also found evidence that water transported upward by thunderstorm activity over land originates from both plant "exhalation" in large forests and evaporation over nearby oceans. The balance between the two sources indicates how vegetation interacts with climate and helps maintain regional rainfall levels.

"This link between vegetation, hydrology and climate has implications for how societies choose to manage their ecological resources," says Noone. "Our measurements provide a baseline against which future changes in vegetation and climate interactions can be measured."

The team says there has been a general lack of information on the way water moves around in Earth's atmosphere - where it comes from and where it ends up.

"We know the details of this journey are critical for understanding clouds and climate, as well as changes in precipitation patterns and water resources," says Noone.

"Our study measures the conditions under which precipitation and evaporation occur, providing insights into the processes responsible. Better knowledge of these processes ultimately leads to a clearer understanding of the factors that drive the global water cycle and its importance in climate and global climate change.”

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