Andrew Dessler, a Texas A&M atmospheric sciences professor, and colleagues from the University of Colorado, NOAA (National Oceanic and Atmospheric Administration) and the Science and Technology Corp. have had their findings published in the Proceedings of the National Academy of Sciences.
The researchers found that increased surface temperatures, such as from the addition of carbon dioxide to the atmosphere, leads to increased humidity in the stratosphere. Because stratospheric water vapor is a greenhouse gas, this leads to additional warming, they said. This cycle is frequently called a climate feedback.
“We find that this stratospheric water vapor feedback is probably responsible for 5-10 percent of the total warming you get from adding carbon dioxide to the climate,” Dessler explained. “While it’s not really surprising that this process is going on, we were surprised at how important the process is for our climate system.”
Climate models already include this process, but unevenly. Some models predict large increases in stratospheric humidity, while others don’t, the researchers say.
“It’s clear to us that, if models want to make accurate predictions of climate change, they should get stratospheric water vapor right,” said Sean Davis, a research scientist at the Cooperative Institute for Research in Environmental Sciences at the University of Colorado at Boulder and study coauthor. He added, “A better understanding of the stratospheric water vapor feedback could help explain some of the spread among predictions of future climate change from different models,” referring to the projections made by the recently released 5th Assessment report of the Intergovernmental Panel on Climate Change (IPCC) last week.
Several years ago, Dessler was the first to observationally calculate the strength of the cloud feedback, showing that clouds play a key role in climate change.
The researchers used water vapor measurements from the Microwave Limb Sounder on board NASA’s Aura satellite. It also used simulations from NASA’s Goddard Earth Observing System Chemistry Climate Model. The project was funded by a grant from the National Science Foundation.
A short video explaining the feedback process can be viewed at http://bit.ly/16Ao9Nn.
About Research at Texas A&M University: As one of the world’s leading research institutions, Texas A&M is in the vanguard in making significant contributions to the storehouse of knowledge, including that of science and technology. Research conducted at Texas A&M represents total annual expenditures of more than $776 million. That research creates new knowledge that provides basic, fundamental and applied contributions resulting in many cases in economic benefits to the state, nation and world.
Media contact: Keith Randall, News & Information Services, at (979) 845-4644 or firstname.lastname@example.org or Andrew Dessler at (979) 862-1427 or email@example.com
For more news about Texas A&M University, go to http://tamutimes.tamu.edu/
Follow us on Twitter at https://twitter.com/TAMU
Keith Randall | Newswise
Six-decade-old space mystery solved with shoebox-sized satellite called a CubeSat
15.12.2017 | National Science Foundation
NSF-funded researchers find that ice sheet is dynamic and has repeatedly grown and shrunk
15.12.2017 | National Science Foundation
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences