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Second Annual Earth Day Symposium

UMBC Atmospheric Physics Program

Friday, April 20, 2018 · 9 AM – 5 PM

Physics : 401

2018 Agenda

Presentation List

 

UMBC Physicists Discover Unexpected Effect of African

Wildfires on Climate

African Fires Effect Climate

Clouds play a prominent role in moderating Earth’s climate, but their role is still poorly understood. Generally, clouds cool the Earth by reflecting incoming sunlight back out into space. Reducing the clouds’ reflectivity—with a layer of pollution, for example—reduces the cooling effect. However, new research in Proceedings of the National Academy of Sciences by Zhibo Zhang, associate professor of atmospheric physics at UMBC, two of his students, and collaborators from University of Wyoming, University of Science and Technology of China, Universities Space Research Association, and University of Michigan adds another level of complexity to this model.

Every fall, fires race across central and southern Africa. Many are wildfires; others are intentionally set by humans to clear farmland. They create so much smoke that it’s clearly visible from space. Wind sweeps the smoke westward over the Atlantic Ocean, where it rises above the largest semi-permanent gathering of clouds in the world. For years, scientists believed that overall, the smoke diminishes the clouds’ cooling effect by absorbing light that the clouds beneath otherwise would reflect. The new study by Zhang and colleagues doesn’t dispute the existence of this effect, but introduces a new mechanism that counteracts it by making the clouds more reflective.

“The purpose of this paper is to look at these competing processes. Which one is more important?” asks Zhang. A previous paper by Chamara Rajapakshe, a Ph.D. candidate in Zhang’s group (the UMBC ACROS group) and co-author on the new paper, was crucial to answering that question. Using data from a LiDAR system on the International Space Station, Rajapakshe found that the smoke and cloud layers are much closer to each other than previously observed. That means the smoke, which is in the form of tiny particles known as aerosols, can physically interact with the clouds, affecting how they form at the microscopic level. Previous studies usually overlooked these microphysical changes caused by aerosols’ interactions with the clouds.

Clouds need “seeds” to grow. A seed can be any tiny particle around which cloud droplets condense. Aerosols are perfect for seeding clouds, and with more seeds, many small cloud droplets replace fewer large droplets, which then collectively reflect more light and increase the cooling effect.

The team found that in smoky conditions, there are almost twice as many “seeds” per cubic centimeter. By running computer simulations under different conditions, they determined that overall, “The seeding effect is winning,” Zhang says. So, contrary to long-held understanding, the overall effect of the hovering smoke on the clouds near Africa appears to be a cooling one.

Zhang is quick to point out that this result is not an argument in favor of fires. “Aerosols are a very local phenomenon, and they are also short-lived,” he says, so their cooling effects are short-lived, too. “The lifetime of carbon dioxide and other greenhouse gases,” which are released in abundance when plant material burns, “is hundreds of years.”

The team’s ultimate goal is to refine global climate models by improving how they account for clouds. Zhang’s other Ph.D. student and another co-author, Zhifeng Yang, has contributed to that effort by analyzing data collected by a satellite that stays put in the sky (rather than orbiting Earth) to get a more accurate sense of how cloud cover changes in daily cycles.

The next step is to evaluate existing climate models against the team’s new finding. “Now that we know there are two competing mechanisms, and the seeding effect is winning, we can see whether climate models consider these processes properly when they predict the weather and climate in this area,” explains Zhang.

Zhang, Rajapakshe, and Yang are excited to present their findings to the atmospheric physics community in their new paper, and to continue working in this area to further improve climate models—but the more they learn about the complexity of the processes involved, the harder it gets.

“First we had to simulate the clouds correctly. Then we had to simulate the aerosols correctly, and now we have to also simulate the interactions between them correctly,” says Zhang. “It’s becoming a much harder question to address.”

Still, they are up for the challenge. A new NASA mission called PACE is expected to launch in 2020. It will be able to detect polarized light, in addition to everything LiDAR can do.

“With the new satellite you can look at things from different perspectives,” says Zhang, and develop three-dimensional models of the interactions between aerosols and clouds. “Hopefully we can look at this phenomenon even better.”

Beyond the upcoming NASA mission, what really excites Zhang and his team is the opportunity to play a role in making sure communities around the world have the best information available as they prepare for the effects of climate change.

Image: View from a data-collecting aircraft over the Atlantic Ocean, where a layer of smoke is visible above the clouds. (NASA/Kirk Knobelspiesse)

National Science Foundation Link: UMBC Physicists Discovery

University of Wyoming Related Link:  UW Researchers Lead Study that Discovers South African Wildfires Create Climate Cooling

  • Dr. Huemmerich Discusses March for Science Goals

    March for Science raises public trust, support for discovery
    Almost five decades ago, Fred Huemmrich marched on the first Earth Day as a Pittsburgh high school student. Back then, standing up against air pollution was a controversial act, he remembers....
    Posted: April 24, 2017 8:49 AM
  • Grant Awarded from the Center of Environmental Science

    Something to CHEW On (Climate, Health, Ecosystems, Weather)
    Susan Hoban (JCET faculty) and Alexandra St. Pé (JCET graduate student) have been awarded a grant from the University of Maryland Center of Environmental Science for a project entitled "Something...
    Posted: April 21, 2017 10:54 AM
  • MANIAC TALK: From the Atom to the Atmosphere and Beyond

    J. Vanderlei Martins, Physics Professor
    Dr. Martins will discuss the saga of a young physicist who, like many others, wanted to follow Feynman’s and Einstein’s steps in making fundamental discoveries that would change the world, but...
    Posted: March 29, 2017 9:11 AM
  • On Antarctica's Larsen Ice Shelf

    Dr. Christopher Shuman, a JCET researcher who has studied ice sheets at NASA’s Goddard Space Flight Center, told the Earth Observatory, “Once you pop that cork, the wine inside — all that glacial...
    Posted: February 17, 2017 12:04 PM
  • JCET Paper Wins Award

    Congratulations to JCET Faculty Jasper Lewis and Simone Lolli, who are co-authors on a paper that has received the 2017 Alan Berman Research Publication Award, which is conferred by the Naval...
    Posted: February 6, 2017 11:22 AM
  • SmallSat Revolution

    Tiny satellites make big contributions to essential science
    J. Vanderlei Martins Professor of Physics, University of Maryland, Baltimore County Tiny satellites, some smaller than a shoe box, are currently orbiting...
    Posted: February 3, 2017 9:00 AM
  • CALL FOR PROPOSALS

    JCET GRADUATE STUDENT FELLOWSHIP 2017-18
    Due Date: 5 PM EDT, April 21, 2017 JCET is seeking proposals from the JCET faculty or fellows at UMBC or NASA Goddard who wish to engage a new student on a research projects. Non-JCET faculty...
    Posted: February 1, 2017 3:44 PM
  • Climate & Radiation Laboratory Seminar Series

    Wednesday, February 1, 2017 at Goddard Space Flight Center
    Weak secular variations in the solar irradiance are hotly debated, as they may have large implications on our understanding of the role of the Sun in climate.  If the total energy that reaches...
    Posted: January 27, 2017 2:15 PM
  • GES Seminar Series

    Faculty present poster session
    On December 7, 2016, JCET faculty presented a poster session featuring faculty research. Topics included Satellite Aerosol Remote Sensing, Ice Loss Processes in The Seal Nunataks Ice Shelf,...
    Posted: January 17, 2017 2:24 PM
  • JCET at the American Geophysical Union Fall Meeting

    Scientists meet to collaborate over sustainability issues
    JCET staff and faculty were present at the annual American Geophysical Union (AGU) meeting in San Francisco, CA (December 12-16, 2016). Valerie Casasanto presented a poster ‘Height Matters:...
    Posted: January 17, 2017 8:59 AM