Archive for July, 2016

Marc Frischer on morning radio program Thursday & Friday

July 28, 2016

Marc at WTKS w

Dr. Marc Frischer was a guest on the WTKS Radio morning show this morning to talk about black gill in shrimp. Thanks to Bill Edwards and Laura Picone for the invitation. They also taped a second interview which will be aired tomorrow morning. In Savannah, it’s 1290 on the AM dial.

UGA Skidaway Institute scientists study role of sunlight on marine carbon dioxide production

July 21, 2016

Scientists at the University of Georgia Skidaway Institute of Oceanography have received a $527,000 grant from the National Science Foundation Chemical Oceanography Program to answer one of the long-standing questions about carbon in the ocean—the rate sunlight produces carbon dioxide from organic carbon molecules in the sea.

Jay Brandes, Leanne Powers and Aron Stubbins will use a new technique they developed to measure this process, which is known as photo-degradation.

Researchers Aron Stubbins (l) and Jay Brandes

Researchers Aron Stubbins (l) and Jay Brandes

The ocean is full of millions of different types of organic compounds. Some are consumed by bacteria, but many are not easily consumed and remain in the ocean for hundreds or thousands of years. However, near the surface, sunlight causes the breakdown of organic compounds and converts them into carbon dioxide through photo-degradation. Until recently, this process has been nearly impossible to measure directly in most of the ocean because the additional carbon dioxide produced per day is tiny compared to the existing high concentration of CO2 present in the sea.

Researcher Leanne Powers

Researcher Leanne Powers

Brandes described the problem as looking for a needle in a haystack.

“You might think this is not important because it is hard to measure, but that’s not true,” he said. “We’re talking about a process that takes place across the whole ocean. When you integrate that over such a vast area, it becomes a potentially very important process.”

The project became possible when the team developed a new technique to measure the change in CO2 concentration in a seawater sample. The concept was the brainchild of Powers, a Skidaway Institute post-doctoral research associate. The technique uses carbon 13, a rare, stable isotope of carbon that contains an extra neutron in its nucleus. Researchers will add a carbon 13 compound to a sample of seawater and then bombard the sample with light. The scientists will then use an instrument known as an isotope ratio mass spectrometer to measure the changes in CO2 concentration.

According to Brandes, this project will be breaking new ground in the field of chemical oceanography.

“We don’t know what the photo-degradation rates are in most of the ocean,” he said. “We are going to establish the first numbers for that.”

The team plans to take samples off the Georgia coast, as well as from Bermuda and Hawaii.

While they will continue to refine the carbon 13 technique, Brandes said it is now time to put that tool to work.

“It is now a matter of establishing what the numbers are in these different locations and trying to develop a global budget,” he said. “Just how much dissolved organic carbon is removed and converted to CO2 every year?”

The project is funded for three years. The team will also create an aquarium exhibit at the UGA Aquarium on the Skidaway Island campus to help student groups and the public understand river and ocean color.

VIDEO – The climate change issue you probably haven’t heard about

July 6, 2016

The soil in the Arctic holds a massive store of carbon. These remnants of plants and animals that lived tens of thousands of years ago have been locked in permafost, soil that is always frozen…until now.

UGA Skidaway Institute of Oceanography scientist Aron Stubbins is part of a team that travelled to Siberia to discover what happens to that carbon when the permafrost thaws.

 

Savannah newspaper article features UGA Skidaway Institute and R/V Savannah

July 5, 2016

The Savannah Morning News published a nice article over the weekend on the Rivers to Reefs teacher development program produced by Gray’s Reef National Marine Sanctuary. Although the Rivers to Reefs is not a Skidaway Institute program, the last day of the experience was on board the Research Vessel Savannah. The ship and Skidaway scientist Marc Frischer are prominently featured. Here is a link to the article and also to a slide show on the SMN Web site. Kudos to Dash Coleman for an excellent article and beautiful pictures.

http://savannahnow.com/education-news-news/2016-07-02/georgia-teachers-get-muddy-drenched-and-familiar-fish-trip-savannah

Photo Slide Show:

http://savannahnow.com/slideshow/2016-06-30/rivers-reefs-2016-expedition-grays-reef-national-marine-sanctuary#slide-1

UGA Skidaway Institute receives funding for regional glider network

July 1, 2016

University of Georgia Skidaway Institute of Oceanography researcher Catherine Edwards is leading a team that has received a five-year, $750,000 grant from the Southeast Coastal Ocean Observing Regional Association, or SECOORA, to establish a regional glider network.

Also known as autonomous underwater vehicles, the gliders are torpedo-shaped crafts that can be packed with sensors and sent on underwater missions to collect oceanographic data. Equipped with satellite phones, the gliders surface periodically to transmit their recorded data and to receive new instructions during missions that can last from weeks to months.

UGA Skidaway Institute of Oceanography researcher Catherine Edwards assembles the tail cone assembly of a glider.

UGA Skidaway Institute of Oceanography researcher Catherine Edwards assembles the tail cone assembly of a glider.

The team will work collaboratively to operate regular glider missions on the continental shelf in an area from North Carolina to Florida known as the South Atlantic Bight. Regular coordinated experiments will involve simultaneous deployment of gliders at multiple locations off Florida, Georgia and North Carolina. Sensors on the gliders will allow the team to map temperature, salinity, density, dissolved oxygen and other scientific data over the entire South Atlantic Bight. The data will help scientists understand ocean processes and how the ocean physics may affect fisheries—for example, the location of fronts or areas of increased productivity where fish often congregate.

“This glider observatory is the first time regular glider efforts have been funded in the South Atlantic Bight and is complementary to larger SECOORA efforts in observing and modeling,” Edwards said. “The work is highly leveraged by contributions from each of the team members and partnerships with fisheries and observing groups at the National Oceanic and Atmospheric Administration and NASA.”

Edwards and her team have designed the deployments with input from fisheries management partners and interests of commercial and recreational fisheries. Gliders will also be outfitted with passive and active acoustics receivers that will record sound and measure signals from tagged fish.   Fisheries managers at Gray’s Reef National Marine Sanctuary, state Department of Natural Resources offices, the South Atlantic Fisheries Management Council and others will be able use this information to better understand the ocean “soundscape,” fish migrations and key species use of their habitat.

“The glider missions will contribute important information related to research underway at Gray’s Reef,” said Sarah Fangman, superintendent of Gray’s Reef National Marine Sanctuary. “We have been studying fish movement patterns inside the sanctuary, and the gliders’ acoustic receivers will provide a valuable new tool to expand where we can observe fish movements.”

In addition to regular coordinated experiments with multiple gliders and maximum regional coverage, the project will leverage opportunities to develop regular transects in areas where glider data may be of interest, for example near marine protected areas like Gray’s Reef National Marine Sanctuary and other critical habitat zones designated by the South Atlantic Fisheries Management Council.

The glider data will provide valuable information for validation of ocean models—regional models of ocean circulation funded by SECOORA as well as the larger modeling community. Further, the data will be packaged and used to improve ocean model forecasts.

“We’re sending all of the glider data to the National Glider Data Assembly Center as it comes in so that it can be assimilated into the U.S. Navy’s operational models,” Edwards said. “The gliders will improve Navy forecasts on the fly with real time data.”

The remainder of the research team includes Chad Lembke from the University of South Florida, Ruoying He from North Carolina State University, Harvey Seim from the University of North Carolina and Fumin Zhang from the Georgia Institute of Technology.

Data and maps from the project will be shared freely and made available to the research community, fisheries managers and other stakeholders and the general public in near-real time through SECOORA at http://secoora.org/ and the National Data Buoy Center.