Cold air rises—what that means for Earth's climate

Cold air rises -- what that means for Earth's climate
This graphic illustrates the vapor buoyancy effect, in which cold, humid air rises because it is lighter than dry air. Credit: Da Yang/UC Davis

Conventional knowledge has it that warm air rises while cold air sinks. But a study from the University of California, Davis, found that in the tropical atmosphere, cold air rises due to an overlooked effect—the lightness of water vapor. This effect helps to stabilize tropical climates and buffer some of the impacts of a warming climate.

The study, published today in the journal Science Advances, is among the first to show the profound implications buoyancy has on Earth's climate and .

"It's well-known that water vapor is an important greenhouse gas that warms the planet," said senior author Da Yang, an assistant professor of atmospheric sciences at UC Davis and a joint faculty scientist with Lawrence Berkeley National Laboratory. "But on the other hand, water vapor has a buoyancy effect which helps release the heat of the atmosphere to space and reduce the degree of warming. Without this lightness of water vapor, the climate warming would be even worse."

Humid air is lighter than dry air under the same temperature and pressure conditions. This is called the vapor buoyancy effect. This study discovered this effect allows cold, humid air to rise, forming clouds and thunderstorms in Earth's tropics. Meanwhile, warm, dry air sinks in clear skies. Earth's atmosphere then emits more energy to space than it otherwise would without vapor buoyancy.

The study found that the lightness of water vapor increases Earth's thermal emission by about 1-3 watts per square meter over the tropics. That value compares with the amount of energy captured by doubling carbon dioxide in the atmosphere. The authors' calculations further suggest that the radiative effects of vapor buoyancy increase exponentially with climate warming.

A better understanding of the buoyancy effect and its stabilizing role in the tropics can also improve cloud and thunderstorm simulations, as well as , the study said.

"Now that we understand how the lightness of water regulates , we plan to study whether global models accurately represent this effect," said the study's lead author, Seth Seidel, a graduate student researcher at UC Davis.


Explore further

Measuring the effect of water vapor on climate warming

More information: "The lightness of water vapor helps to stabilize tropical climate" Science Advances (2020).
Journal information: Science Advances

Provided by UC Davis
Citation: Cold air rises—what that means for Earth's climate (2020, May 6) retrieved 1 December 2020 from https://phys.org/news/2020-05-cold-air-riseswhat-earth-climate.html
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