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    • 2019-04-10 08:00:12
    • Article ID: 710970

    Climate Scientists Partner with San Francisco to be Ready for Future Storms

    Berkeley Lab climate modeling techniques can assess how global warming will affect intensity of storms

    • Credit: Berkeley Lab

      An atmospheric river event on January 17, 2017, depicted by total atmospheric precipitable water (mm) from (top) observations and (bottom) a 27 km resolution regional climate model hindcast simulation. Berkeley Lab climate scientists will use climate modeling methods they used in previously published peer-reviewed research to assess how climate change will affect the severity of future San Francisco Bay Area storms.

    --By Christina Procopiou

    The San Francisco Bay Area has been pummeled this winter by storms packed with moisture from atmospheric rivers. Formed when atmospheric water vapor is pushed across the Pacific Ocean by strong winds, atmospheric rivers deliver much of the Bay Area’s precipitation.

    The City and County of San Francisco (CCSF) is partnering with experts from Lawrence Berkeley National Laboratory (Berkeley Lab) and Silvestrum Climate Associates to assess how climate change may influence the intensity of atmospheric rivers and associated precipitation, and how those changes may impact San Francisco and its infrastructure. 

    Berkeley Lab climate scientists Christina Patricola and Michael Wehner will leverage a computing method they developed, published, and previously used to study how climate change affected Hurricanes Maria, Katrina, and Irma and a 2013 Colorado storm that caused record flooding. In their collaboration with CCSF the researchers will take a similar approach, using climate models to first simulate historical storms that severely impacted the Bay Area, and then predict how increased greenhouse gas concentrations may alter similar storms in the future.

    “We will consider the two main types of Bay Area storms – atmospheric rivers and mid-latitude cyclones – because it is possible that climate change may influence the two storm types differently. By considering both, we can provide a more complete understanding of how climate change may influence precipitation in the future,” Patricola, a research scientist in Berkeley Lab’s Climate and Ecosystem Sciences Division, said.

    Current state-of-the-art long-term climate simulations are approaching resolutions of 25 kilometers, which can broadly represent atmospheric rivers. However, even at 25 kilometers, climate models struggle to represent the magnitude of extreme rainfall events and fail to distinguish between the bay and the peninsula, including its terrain.

    Advanced supercomputers at Berkeley Lab’s National Energy Research Scientific Computing Center (NERSC) allow Patricola and Wehner to produce climate simulations at a resolution of 3 km, which is more suitable for representing intense rainfall rates and provides precipitation data at a resolution more appropriate for local decision makers. They have developed a high-resolution “hindcasting” method that allows them to quantify how climate change may modify the intensity of extreme weather events.

    A 2018 study by the researchers showed climate change intensified the amount of rainfall in recent hurricanes such as Katrina, Irma, and Maria by 5 to 10 percent. A study the previous year found that climate change substantially enhanced rainfall during the 2013 flood event in Boulder, Colorado, which washed away 500 miles of roadway and 30 bridges. Patricola and Wehner will approach their analysis of Bay Area extreme precipitation using similar methods.

    San Francisco is home to the country’s seventh busiest airport and a 100-plus year-old seawall standing between the waterfront and the bay. Anna M. Roche is a Project Manager for San Francisco’s Public Utilities Commission who is involved in CCSF’s efforts to better understand how extreme precipitation due to climate change may affect the Bay Area. CCSF, according to Roche, stands to benefit from climate simulations that are produced at a resolution of 3 km versus 25 km.

    “Given the size of San Francisco (11.5 km x 11.5 km) – and the fact that we are coastal and get atmospheric rivers at the rate that we do – global climate modeling with resolutions of 25-plus km simply won’t tell us enough,” said Roche. “The ability for a climate model to allow us to focus in on the impact a storm had or could have on an area as specific as 3 km allows CCSF to consider more meaningful decisions.”

    Patricola says that it can be difficult to identify how climate change may be influencing storm severity using observations alone because natural variability can drive large variations in storm characteristics and extreme events are relatively rare. “The climate modeling approach allows us to focus on the rare storms that are most impactful and to simulate a large sample size of those storms,” she said. “The challenge is that standard climate models struggle to represent extreme rainfall rates." 

    “Our high-resolution models will allow us to represent the extreme rainfall rates that impact the San Francisco Bay Area. That’s very important to making reliable predictions about what extreme weather could look like under climate change,” she said.

    This work is funded by the City and County of San Francisco. NERSC is a DOE Office of Science user facility at Berkeley Lab.

    # # #

    Founded in 1931 on the belief that the biggest scientific challenges are best addressed by teams, Lawrence Berkeley National Laboratory and its scientists have been recognized with 13 Nobel Prizes. Today, Berkeley Lab researchers develop sustainable energy and environmental solutions, create useful new materials, advance the frontiers of computing, and probe the mysteries of life, matter, and the universe. Scientists from around the world rely on the Lab’s facilities for their own discovery science. Berkeley Lab is a multiprogram national laboratory, managed by the University of California for the U.S. Department of Energy's Office of Science.

    DOE’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov.

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