MIAMI – A scientist at the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science is leading an upcoming international research campaign to study a significant contributor to regional climate warming – smoke. The first-of-its-kind research experiment begins on June 1, 2016 from Ascension Island in the southeastern Atlantic Ocean. The experiment, called […]Read more...
MIAMI – A scientist at the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science is leading an upcoming international research campaign to study a significant contributor to regional climate warming – smoke. The first-of-its-kind research experiment begins on June 1, 2016 from Ascension Island in the southeastern Atlantic Ocean. The experiment, called LASIC (Layered Atlantic Smoke Interactions with Clouds), is part of a broader international scientific collaboration led by the Atmospheric Radiation Measurement (ARM) Climate Research Facility deployment. The broad collaboration is detailed in a new article in the July Bulletin of the American Meteorological Society.
Southern Africa is the world’s largest emitter of smoke particles in the atmosphere, known as biomass-burning aerosols, from the burning of grasslands and other biomass. The project will help researchers better understand the effects of widespread biomass burning on Earth’s climate.
The study will investigate how smoke particles flowing far offshore from the African continent affect the remote and cloudy southeast Atlantic climate. Smoke, which absorbs sunlight, is a warming agent in the climate system when located above a bright surface, such as clouds. The smoke overlying the southeast Atlantic provides one of the largest aerosol-based warming of climate on the planet, since the region is also home to one of the largest low-cloud decks on the planet.
“Ascension Island is an ideal location since it is very remote and allows us to sample the smoke after it is well-aged, about which less is known,” said Paquita Zuidema, professor of atmospheric sciences at the UM Rosenstiel School and principal investigator of the research experiment. The long deployment time will allow us to characterize the marine low clouds both with and without the presence of smoke. This is ultimately valuable for understanding the Earth’s energy balance.”
By evaluating how the low clouds respond to the presence of sunlight-absorbing aerosols, scientists can better understand low cloud behavior, which is currently an uncertainty in model predictions of future climate, since no fundamental theory on low cloud processes is yet in place.
Low clouds dominate the atmosphere over the southeast Atlantic Ocean all year. Bright white cloud appears darker when viewed from above when smoke is present. The southeast Atlantic overall is brighter, not darker when smoke is present, suggesting that the clouds become thicker and more extensive when smoke is present.
Zuidema received a $365,050 seed grant from the U.S. Department of Energy to plan the study. And a $440,225 grant from NASA which further supports related aircraft investigations as part of the NASA Earth Venture Suborbital-2 ORACLES project.
NASA will complement the DOE surface-based measurements with airborne experiments during a month of each year in 2016-2018. This will allow researchers to take airborne samples of smoke particles as it ages, information that will improve satellite retrievals of this mixed smoke-cloud regime. The United Kingdom will also participate with its research aircraft, and French, Namibian, and South African scientists will collect and interpret aircraft and ground-based measurements closer to the Namibian coast.
The UM Rosenstiel School-led research team will study how smoke is transported through the atmosphere and across the Atlantic, how the aerosols change when transported, and the response of the low-lying clouds to the smoke. The information from the experiments will ultimately be used to improve global aerosol models and climate change forecasts.
Through the School of Aquatic and Fishery Sciences, Sarah Schooler, ’15, spent six weeks in the Alaskan bush, collecting the same data in the field she’d been studying in the classroom: salmon and the hungry habits of grizzly bears. “Male, brain, body.” “Female, belly.” Seven days a week, Sarah Schooler, ’15, suits up in chest-high […]Read more...
Through the School of Aquatic and Fishery Sciences, Sarah Schooler, ’15, spent six weeks in the Alaskan bush, collecting the same data in the field she’d been studying in the classroom: salmon and the hungry habits of grizzly bears.
“Male, brain, body.”
Seven days a week, Sarah Schooler, ’15, suits up in chest-high waders, grabs her bear spray, hops a boat, and walks the length of Lake Aleknagik’s Hansen Creek, counting and categorizing every dead sockeye salmon she happens upon, calling out the sex followed by the parts of the body that were consumed.
Brain, body, belly, hump.
Some salmon are floating lifelessly downstream, carried away from the hordes pushing the opposite direction — upstream — to spawn. Others have washed ashore the gravel banks, while countless others have been littered across “bear kitchens” — flat spots among the tall grass where the sheer size (and constant presence) of a grizzly has matted down the earth.
Another student quickly scribbles the data, while Schooler hooks what’s left of the salmon with a gaff and chucks it to the side of the stream, essentially wiping the carnage clean so she can collect a new set of data the next day. At random, Sarah tags the jaws of the dead to see if bears return to snack on the parts of the fish they passed on before — maybe they took a bite of the belly then left the rest — noting the GPS coordinates.
On an “easy” day, walking the mile-and-a-half-long stream takes maybe an hour and a half. On a heavy kill day? The process of working through hundreds of fish takes more like seven or eight hours.
And that’s life for a student, like Schooler, spending a summer collecting data in the greater Bristol Bay watershed through the School of Aquatic and Fishery Sciences’ Alaska Salmon Program — the world’s longest-running effort to monitor salmon and their ecosystems.
Learn more about Sarah Schooler’s project and see the results of her research at the University of Washington website.