News / Science & Technology

Study: Warmer World Will Produce Fewer Clouds

The sun sets off Waikiki Beach, in Honolulu, Hawaii on Dec. 31, 2013. Scientists expect to see fewer clouds in a warmer world as carbon emissions rise.
The sun sets off Waikiki Beach, in Honolulu, Hawaii on Dec. 31, 2013. Scientists expect to see fewer clouds in a warmer world as carbon emissions rise.
Rosanne Skirble
With rising global carbon emissions, the planet will heat up and cloud cover will dissipate, according to a new study.

The concentration of heat-trapping carbon dioxide in the atmosphere has climbed 40 percent over the last century. And, the new study reports, in response to the release of CO2 emissions, from the burning of fossil fuels in power plants, cars and buildings, the Earth will continue to warm to dangerous levels. 

Steven Sherwood, a climate scientist at Australia's Centre of Excellence for Climate System Science and lead author of the report, says the prediction of a 4-degree celsius warming is based on the role of water vapor in cloud formation.

“What we see in the observations is that when air picks up water vapor from the ocean surface and rises up, it often only rises a few kilometers before it begins its descent back to the surface," Sherwood said. "Otherwise it might go up 10 or 15 kilometers. And those shorter trajectories turn out to be crucial to giving us a higher climate sensitivity because of what they do to pull water vapor away from the surface and cause clouds to dissipate as the climate warms up.” 

LISTEN Study: Warmer World Will Produce Fewer Clouds
Study: Warmer World Will Produce Fewer Cloudsi
|| 0:00:00
...    
🔇
X

Under this scenario, in which clouds do not form, the Earth would absorb more sunlight. 

“The question for many years has been ,what is going to happen to the amount of low clouds?" Sherwood said. "Does it decrease when the Earth warms up or does it stay the same or maybe even increase?  And what we found is that it should be decreasing because of this mixing process, which pulls water vapor away from the layers where these clouds form and causes there to be fewer of them in the warmer atmosphere.” 

Climate models that show a slight global temperature response to carbon dioxide do not take the lower altitude water vapor process into account, according to Sherwood. Instead their simulations assume that all water vapor rises to 15 kilometers and forms clouds. 

“Estimates of the climate sensitivity that have been lower are founded on models of the atmosphere that are not consistent with observations,” he said.

When the processes in climate models are corrected to match the real world observations, the simulations produce cycles that take water vapor to a wider range of heights in the atmosphere. Sherwood says the study is yet another warning to curb emissions or deal with the impacts of climate change.

You May Like

Captured IS Militants Explain Why They Fought

Fighters from Turkey, Syria tell VOA Kurdish Service what drew them to extremism, jihad More

Security Experts Split on Kenyan Barrier Wall

Experts divided on whether initiative aiming to keep out al-Shabab militants is long-awaited solution or misguided effort More

Video Philippines Wants Tourists Spending Money at New Casinos

Officials say they hope to turn Manila into the next Macau, which has long been Asia’s gambling hub More

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Liberia's Almost Last Ebola Patient Grateful but Still Grievingi
X
Benno Muchler
March 26, 2015 3:41 PM
Beatrice Yardolo was to make history as Liberia’s last Ebola patient. Liberians recently started counting down 42 days, the period that has to go by without a single new infection until the World Health Organization can declare a country Ebola-free. That countdown stopped on March 20 when there was another new case of Ebola, making Yardolo’s story a reminder that Ebola is far from over. Benno Muchler reports from Monrovia.
Video

Video Liberia's Almost Last Ebola Patient Grateful but Still Grieving

Beatrice Yardolo was to make history as Liberia’s last Ebola patient. Liberians recently started counting down 42 days, the period that has to go by without a single new infection until the World Health Organization can declare a country Ebola-free. That countdown stopped on March 20 when there was another new case of Ebola, making Yardolo’s story a reminder that Ebola is far from over. Benno Muchler reports from Monrovia.
Video

Video Cambodian Land Grabs Threaten Traditional Communities

Indigenous communities in Cambodia's Ratanakiri province say the government’s economic land concession policy is taking away their land and traditional way of life, making many fear that their identity will soon be lost. Local authorities, though, have denied this is the case. VOA's Say Mony went to investigate and filed this report, narrated by Colin Lovett.
Video

Video US, South Korea Conduct Joint Military Exercises

The Eighth U.S. Army Division and the Eighth Republic of Korea Mechanized Infantry Division put on a well orchestrated show of force for the media this week during their joint military training exercises in South Korea. VOA’s Seoul correspondent Brian Padden was there and reports the soldiers were well disciplined both in conducting a complex live fire exercise and in staying on message with the press.
Video

Video Space Program Status Disappoints 'Last Man on the Moon'

One of the films that drew big crowds last week at the annual South by Southwest festival in Austin, Texas, tells the story of the last human being to stand on the moon, U.S. astronaut Eugene Cernan. It has been 42 years since Cernan returned from the moon and he laments that no one else has gone there since. VOA’s Greg Flakus reports.
Video

Video Young Filmmakers Shine Spotlight on Giving Back

A group of student filmmakers from across the United States joined President Barack Obama at the White House this month for the second annual White House Student Film Festival. Fifteen short films were officially selected from more than 1,500 entries by students aged 6 through 18. The filmmakers and their families then joined the president and a group of celebrities for a screening of their films. VOA’s Julie Taboh reports.
Video

Video VOA Exclusive: Interview with Afghan President Ashraf Ghani

Afghan President Ashraf Ghani, during his first visit as president to Washington, gave a one-on-one interview with VOA Afghan Service reporter Said Suleiman Ashna, about his request for a change in U.S. troop levels, the threat from the Islamic State, and repairing relations with the United States and Pakistan. The interview was held at Blair House, late Sunday, in Pashto.
Video

Video California Science Center Tells Story of Dead Sea Scrolls

The ancient manuscripts were uncovered in the mid-20th century, and they are still yielding clues about life and religious beliefs in ancient Israel. As VOA's Mike O'Sullivan reports, an exhibit in Los Angeles shows how modern science is bringing the history of these ancient documents to life.
Video

Video Angelina Jolie Takes Another Bold Step

Hollywood actress and filmmaker Angelina Jolie has revealed she had her ovaries and fallopian tubes removed to lower her odds of getting cancer. Doctors say the huge publicity over her decision will help raise awareness about the importance of cancer screening. VOA’s George Putic has more

All About America

Circumventing Censorship

An Internet Primer for Healthy Web Habits

As surveillance and censoring technologies advance, so, too, do new tools for your computer or mobile device that help protect your privacy and break through Internet censorship.
More