Ocean Probes Offer Insight Into Climate Change
USC Dornsife researcher has opened a new window to understanding how the ocean impacts climate change.
Lisa Collins, environmental studies lecturer at the USC Dana and David Dornsife College of Letters, Arts and Sciences, spent four years collecting samples from floating sediment traps in the San Pedro Basin off the Los Angeles coast, giving scientists a peek at how much carbon is locked up in the ocean and where it comes from.
Collins’ research suggests that the majority of particulate organic carbon (POC) falling to the basin floor is marine-derived, not the result of runoff from rainfall. This means that the ocean off the coast of Southern California is acting as a carbon “sink” – taking carbon out of the atmosphere via phytoplankton and locking it up in sediment.
Though estimates regarding the effect of carbon in the ocean already exist, her hard data can help climatologists create more accurate predictions of how carbon will impact global warming.
What is unique about Collins’ study is that it is not just a snapshot of POC falling, but rather a finely detailed record of four years of POC production, showing how much fell and when.
“It’s all tied to climate change,” said Collins, who started the research as a graduate student working for Professor Will Berelson of earth sciences. “This lets us see patterns.
“Our data can help climate modelers better predict the interactions between the oceans and atmosphere with respect to carbon, which can help them better predict how much carbon dioxide will end up sequestered over the long term as sediments in the ocean,” she said.
Collins’ study is among the longest of its kind in the region. A similar study was conducted in the Santa Monica Basin from 1985 to 1991, and another currently is under way in Hawaii. Her findings appear in the August issue of Deep-Sea Research I.
Between January 2004 and December 2007, Collins took 32 trips to the San Pedro Basin, which is located about halfway between San Pedro and Catalina Island. She deployed giant yellow funnels about the size of a person hundreds of meters under water to collect sediment as it floated by.
Results were anything but guaranteed, which is the nature of the job.
“Oceanography is risky; you lose things,” Collins said. “Any time you throw something over the boat, you say ‘God, I hope that’s not the last time I see it.’” In fact, Collins lost what would have been six months worth of additional data due to malfunctioning sediment traps.
The next step for Collins will be to check out the waters off of Palos Verdes, testing to see if her findings can be seen on a larger scale throughout the region.
The National Science Foundation funded the research.
Related News Items
- Good Stress October 1, 2015
- Octopus Video Aids Linguists October 1, 2015
- Population, Health and Place September 29, 2015
- A Plan for Tomorrow September 29, 2015
- Welcome New Faculty September 23, 2015
- Disruptive Science September 15, 2015
- Pope Francis — Environmental Activist? September 10, 2015
- Bacteria in Overdrive September 8, 2015
- Strange Earthquakes August 31, 2015
- Exploring Arctic Issues August 27, 2015
- Toward a Better World August 24, 2015
- Trusting His Animal Instincts August 14, 2015
- Phantastic Physics? August 14, 2015
- Stamp of Approval August 6, 2015
- Zombie Cells August 6, 2015
- Quakes, Landslides, Now Floods? July 28, 2015
- Science of Sleep July 24, 2015
- Mexican Postdocs Welcomed July 17, 2015
- Fossil Upsets Evolutionary Model July 7, 2015
- Shark Week Indebted to More Than Sharks July 6, 2015