EESA Researchers Solve Deepwater Horizon Mystery - Earth and Environmental Sciences Area

Deepwater Horizon oil spill. (Photo courtesy of Wikimedia Commons)

The Deepwater Horizon oil spill in the Gulf of Mexico in 2010 is one of the most studied spills in history, yet scientists haven’t agreed on the role of microbes in eating up the oil. Now a research team at the Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) has identified all of the principal oil-degrading bacteria as well as their mechanisms for chewing up the many different components that make up the released crude oil.

Gary Andersen (Photo credit: Berkeley Lab)

The team, led by Gary Andersen—a microbial ecologist and senior scientist at Berkeley Lab’s Earth & Environmental Sciences Area—is the first to simulate the conditions that occurred in the aftermath of the spill. Their study, “Simulation of Deepwater Horizon oil plume reveals substrate specialization within a complex community of hydrocarbon-degraders,” was just published in the Proceedings of the National Academy of Sciences.

“This provides the most complete account yet of what was happening in the hydrocarbon plumes in the deep ocean during the event,” said Andersen. Berkeley Lab’s Ping Hu, the lead author of the study, added: “We simulated the conditions of the Gulf of Mexico oil spill in the lab and were able to understand the mechanisms for oil degradation from all of the principal oil-degrading bacteria that were observed in the original oil spill.”

Read the full press release at the Berkeley Lab News Center here.

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EESA Develops New Approach to Restock California’s Groundwater via Almond Orchards, Vineyards

August 3, 2017

Groundwater—the water stored underneath the Earth’s surface between the cracks and spaces in soil, sand, and bedrock—is essential for the California residents and farmers who rely on it for up to 46 percent of their annual water use. Yet during the 2012-2017 drought, the state’s surface water supply was not sufficient to meet demand, resulting in excess groundwater pumping that caused land subsidence of up to 13 inches in some parts of the San Joaquin Valley.

Now a team of scientists at Berkeley Lab’s Earth & Environmental Sciences Area are working with farmers and partners like the Almond Board of California and UC Davis to test on-farm banking, a new approach that has the potential to manage groundwater more sustainably. It’s an improvement on the age-old method of groundwater recharge, the process of replenishing aquifers by infiltrating water from the surface into shallow aquifers.

“On-farm banking has the promise of making the most productive use of the greatest amount of land possible while increasing the reliability and resiliency of California’s groundwater supply,” says EESA scientist Peter Nico, a soil and environmental biogeochemist.

EESA Scientist Builds Cross-Border Collaborations for Geothermal Research

August 1, 2017

Thirty-five years ago, Berkeley Lab’s Earth & Environmental Sciences Area (EESA) scientist Patrick Dobson began his career as a graduate student by conducting field mapping, collecting fluid samples, and learning the ropes from local scientists at the Los Azufres geothermal field in Michoacán, Mexico. During his summer doing field work in Mexico, he met Berkeley Lab’s Marcelo Lippmann, who was attending a symposium on the Cerro Prieto geothermal field, the subject of a collaborative research project between the Lab (funded by the U.S. Department of Energy) and the Comisión Federal de Electricidad (CFE), Mexico’s state-owned utility.

Now—after decades of leading geothermal exploration projects all over the world, including Indonesia, Central America, and South America— Dobson’s work has come full circle.

Earlier this year, he spent two weeks in Ensenada, Baja California, Mexico as a Fulbright Specialist in geothermal research. Hosted by the Center for Scientific Investigation and Higher Education in Ensenada (CICESE), one of the main hubs for geothermal work in the country, Dobson met with Mexican researchers to share knowledge, identify areas of mutual interest, and explore potential areas of collaboration.