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Home » News and Events » SOCRATES meets ZephIR as Lidar project sets sail to inform global warming strategy

SOCRATES meets ZephIR as Lidar project sets sail to inform global warming strategy

16 Jan 2018

Scientists travel to the remote Southern Ocean to study cloud formation

BOULDER, Colorado, U.S. — This month, an international team of scientists will head to the remote Southern Ocean with a ZephIR 300 wind lidar providing the project’s remote wind measurements on-board the R/V Investigator, an Australian deep-ocean research vessel. The U.S. portion of the project is funded by the National Science Foundation (NSF).

The team’s discoveries will be used to improve climate models, which routinely underestimate the amount of solar radiation reflected back into space by clouds in the region. Accurately simulating the amount of radiation that is absorbed or reflected on Earth is key to calculating how much the globe is warming.

The field campaign, called the Southern Ocean Clouds, Radiation, Aerosol Transport Experimental Study, or SOCRATES, could also help scientists understand the very nature of how clouds interact with aerosols — particles suspended in the atmosphere that can be from either natural or human-made sources. Aerosols can spur cloud formation, change cloud structure, and affect precipitation, all of which affect the amount of solar radiation that is reflected.

During the mission, which will run from mid-January through February, the scientists will utilise data from a collection of advanced instruments packed on-board a research aircraft that is owned by the NSF and operated by the National Center for Atmospheric Research (NCAR) and a research vessel that is operated by the Australia’s Commonwealth Scientific and Industrial Research Organisation (CSIRO). The vessel-installed ZephIR 300 wind lidar will provide advanced wind measurements from 10 to 200 metres above the deck of the research vessel.

“SOCRATES will allow for some of the best observations of clouds, aerosols, radiation, and precipitation that have ever been collected over the Southern Ocean”; said Greg McFarquhar, a principal investigator and the director of the University of Oklahoma Cooperative Institute for Mesoscale Meteorological Studies (CIMMS). “These data will provide us with critical insight into the physics of cloud formation in the region, information we can use to improve global climate models.”

“I’m excited about this campaign because I think it will answer some fundamental questions about clouds and their dependence on atmospheric conditions” said Eric DeWeaver, program director for Climate and Large-Scale Dynamics in the National Science Federation’s Geoscience directorate. “We’ll be able to use this information to understand cloud behaviour closer to home and how clouds are likely to adjust to changing climatic conditions.”

“Much of what we currently know about Southern Ocean cloud, aerosol, and precipitation properties comes from satellite-based estimates, which are uncertain and have undergone few comparisons against independent data,” said co-investigator Roger Marchand, a scientist at the University of Washington.

Sailing the stormiest seas

“Observations from the ship will help us understand the background state of the atmosphere — how it’s behaving” said National Center for Atmospheric Research scientist Bill Brown, who travelled to Australia in late November to prepare for the voyage.

The ship will be deployed for the entire six weeks and will face its own challenges, notably the notorious roughness of the Southern Ocean, sometimes called the stormiest place on Earth. “There are no land masses to break up the winds down there” Brown said. So the ocean can be quite rough.” The ZephIR 300 wind lidar is the industry-standard Lidar offshore and is very experienced in handling the conditions expected to be encountered on the project.

“I am excited that we will have such a comprehensive suite of observations” McFarquhar said. “If we just had the cloud observations we wouldn’t have the appropriate context.”

 

For more about the SOCRATES campaign, visit

https://www.eol.ucar.edu/content/socrates-project-overview

 

Collaborating institutions
Australian Antarctic Division, Australian Bureau of Meteorology, Australian Department of Environment and Energy, Colorado State University, Cooperative Institute for Mesoscale Meteorological Studies, CSIRO, Karlsruhe Institute of Technology, Monash University, National Center for Atmospheric Research, National Science Foundation, NorthWest Research Associates, Queensland University of Technology, University of California San Diego, University of Colorado Boulder, University of Illinois at Urbana-Champaign, University of Melbourne, University of Oklahoma, University of Washington

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