Skip to Main Content

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

  • JCET Quarterly Report

    Report highlighting our ongoing partnership with NASA GSFC.
    The new JCET cooperative agreement is now approaching the second quarter of its second year. This report describes the research of the JCET faculty, funding proposals that have been submitted this...
    Posted: January 4, 2017 10:01 AM
  • GES Department Seminar Series

    JCET Poster Session
    Please join us on Wednesday, December 7th from 12:00-1:00 p.m. in the Sondheim Building, Ground Floor.
    Posted: November 28, 2016 12:41 PM
  • Huemmrich uses NASA satellite to measure photosynthesis

    Measuring effects of climate change on evergreen forests
    The role of forests in climate change is currently an open question, and it’s one that Fred Huemmrich, research scientist at UMBC’s Joint Center for Earth Systems Technology (JCET) and adjunct...
    Posted: November 23, 2016 7:44 AM
  • Students tour Goddard Space Flight Center

    Photography students "see science"
    Digital arts students from Catonsville High had a special visit of NASA Goddard Space Flight Facility on Friday, November 18th, hosted by JCET’s Valerie Casasanto. As part of UMBC’s Seeing...
    Posted: November 21, 2016 12:37 PM
  • JCET Researchers Win Awards

    2016 Atmospheres Annual Awards
    Best Senior Author Publication - Tianle Yuan Citation:  For new insight on the AMO as documented in Geophysical Research Letters entitled, “Positive low cloud and dust feedbacks amplify tropical...
    Posted: November 16, 2016 12:16 PM
  • JCET Polar Scientist quoted in Science Magazine

    Antarctica is a big wild card in sea-level projections
    While attending the multi-day WAIS meeting on October 5, JCET's Christopher A. Shuman was one of a number of scientists interviewed about a joint NSF/BAS program to investigate the Thwaites...
    Posted: October 17, 2016 11:05 AM
  • NOAA Awards NCAS 15.5 Million Dollars to Continue Program

    Educating and Training Students in Atmospheric Sciences
    The National Oceanic and Atmospheric Administration (NOAA) awarded Howard University a multi-year award to cover a five-year period for a total amount of $15.5 million dollars in Federal funds,...
    Posted: October 5, 2016 9:20 AM
  • Dr. Huemmrich Presentation at ISS R&D Conference

    Ecosystem Productivity Talk Featured in UPWARD Magazine
    Ecologist Karl Fred Huemmrich, of the University of Maryland, Baltimore County, described the results of his team’s research using hyperspectral remote sensing data from the ISS to evaluate...
    Posted: September 30, 2016 11:23 AM
  • JCET Presents Dynamic Planet Exhibit

    Earth Science research displayed at UMBC 50 Celebration
    JCET’s Dr. Ali Tokay and Valerie Casasanto interacted with guests at UMBC’s 50th anniversary event on Saturday, September 17, 2016, on UMBC’s campus. They showed people the “Dynamic Planet” -- an...
    Posted: September 28, 2016 9:44 AM
  • JCET Partnership Wins a Substantial Grant

    NOAA supports UMBC, CUNY and Howard University Research
    NOAA’s Office of Education announced $11.9 million each in grants to four lead minority serving institutions across the country. The funds will be used to educate graduate students who pursue...
    Posted: September 7, 2016 10:00 AM