Scientists see four-fold increase in ocean’s annual carbon uptake
The global ocean absorbed 34 billion metric tons of carbon from the burning of fossil fuels from 1994 to 2007 -- a four-fold increase to 2.6 billion metric tons per year when compared to the period starting from the Industrial Revolution in 1800 to 1994.
The new research published by NOAA and international partners in Science finds as carbon dioxide emissions have increased in the atmosphere, the ocean has absorbed a greater volume of emissions. Though the volume of carbon dioxide going into the ocean is increasing, the percentage of emissions -- about 31 percent -- absorbed by it has remained relatively stable when compared to the first survey of carbon in the global ocean published in 2004.
Ocean uptake reduces warming, but comes with a downside
By absorbing increased carbon dioxide from the atmosphere, the ocean reduces the warming impact of these emissions were they to remain in the atmosphere. However, carbon dioxide dissolved into the ocean causes seawater to acidify, threatening the ability of shellfish and corals to build their skeletons, and affecting the health of other fish and marine species -- many that are important to coastal economies and food security.
“The increasing load of carbon dioxide in the ocean interior is already having an impact on the shellfish industry, particularly along the U.S. West Coast,” said Richard Feely of NOAA’s Pacific Marine Environmental Laboratory, leader of NOAA’s West Coast acidification observing network and a co-author of the study. “We have been working with the industry to provide an early warning system against the most severe impacts of rising carbon dioxide levels.”
Rik Wanninkhof, an oceanographer at NOAA’s Atlantic Oceanographic and Meteorological Laboratory and another co-author, added: “A critical question that warrants continued observations of the ocean is if this uptake can be sustained and what might happen to the Earth’s atmosphere if the ocean is unable to absorb continued increased carbon dioxide.”
About the research
The new research was led by Nicolas Gruber of ETH Zurich in Switzerland and builds on a 2004 NOAA-led study that found that 118 billion metric tons of carbon were absorbed by the global ocean from the start of the Industrial Revolution in 1800 to 1994.
The recent findings are based on an analysis of data taken by 50 research cruises that gathered more than 100,000 water samples, including cruises by NOAA Ship Ronald H. Brown, sponsored by NOAA’s Ocean Observing and Monitoring Division. Because these cruises do not occur annually, it takes years for data representing all ocean basins to be collected and thoroughly analyzed.
Building on this extensive effort, NOAA has created an international Ocean Carbon Data System database to help researchers monitor changes in ocean chemistry. The database is managed by Alex Kozyr, a co-author of the study and scientist at NOAA’s National Centers for Environmental Information.
PMEL in the News
A Washington State University scientist is trying to understand how and why the South Asian summer monsoon is changing. For more than 2 billion people, the monsoon rains are a matter of life and death. People in India, Bangladesh, Pakistan and neighboring countries depend on the warm, moisture-...
The Yupik Eskimo village of Kotlik on Alaska’s northwest coast relies on a cold, hard blanket of sea ice to protect homes from vicious winter Bering Sea storms. Frigid north winds blow down from the Arctic Ocean, freeze saltwater and push sea ice south. The ice normally prevents waves from...
Researchers from the University of Granada lead an international project to study two submarine volcanoes in Antarctica with great seismic activity. PMEL's Acoustic Program was part of the research deploying hydrophones in the Bransfield Strait. This article is in Spanish.
Due to naturally cold, low carbonate concentration waters, the Bering Sea is highly vulnerable to ocean acidification (OA), the process in which the absorption of human-released carbon dioxide by the oceans leads to a decrease in ocean water pH and carbonate ion concentration. Emerging evidence suggests that a number of important species in the Bering Sea (such as red king crab and Pacific cod) are vulnerable to OA due to direct (e.g., reduced growth and survival rates) and indirect (e.g.,... more