Baseline Carbon Measurements in Arctic Ocean22/05/2012
|Scientists from the Woods Hole Oceanographic Institution (WHOI) have conducted a study to measure carbon levels at various depths in the Arctic Ocean. The study, recently published in the journal Biogeosciences, provides data that will help researchers better understand the Arctic Ocean’s carbon cycle, the pathway through which carbon enters and is used by the marine ecosystem. It will also offer an important reference point for determining how those levels of carbon change over time, and how the ecosystem responds to rising global temperatures.|
Griffith’s team sampled suspended particles of organic matter, as well as organic carbon and carbon dioxide (CO2) dissolved into the surrounding water. This is the first time that researchers have focused broadly on measuring multiple types of carbon at the same time and place in the Arctic Ocean, due to its remote location and the challenges of operating in sea ice, few comprehensive carbon surveys had been conducted there before this study.
Griffith and his colleagues conducted their fieldwork in 2008 aboard the Canadian Coast Guard icebreaker Louis S. St. Laurent. At two different spots in the Canada Basin, an area northwest of the Canadian coast, they gathered samples from 24 depths ranging from the surface to the ocean floor 3,800 metres (roughly 12,500 feet) below.
Collecting samples at those intervals was necessary, Griffith says, because the Arctic Ocean is separated into distinct layers, each with its own unique carbon characteristics. At the surface is a freshwater layer from river runoff and sea-ice melt. Below that is a layer of cold water from the Pacific, and below that is a warm, salty Atlantic layer. The deepest layer is slowly replaced by mixing with overlying Atlantic water.
To analyse the contents of his samples, Griffith turned to Ann McNichol, a WHOI senior researcher and staff chemist. At WHOI’s National Ocean Sciences Accelerator Mass Spectrometer Facility (NOSAMS), she tallied the total number of carbon atoms in each specimen, including carbon-13, a stable isotope of the element. McNichol says that it can be used to determine where a particular pool of carbon originated, and how it may have been utilised by the marine ecosystem.
In addition to understanding the basic carbon cycle in the Arctic Ocean, Griffith’s team hopes that the results of this baseline study will help evaluate how Arctic Ocean carbon levels and global climate interact. Griffith says there are several ways this could happen.
As the Arctic gradually warms, it may cause a more intense precipitation cycle over northern Canada, Alaska, and Siberia, generating more rainfall each year. This in turn would cause more runoff from melting permafrost and eroded soil—both rich sources of organic carbon.
One possible outcome of that scenario could be an increase of carbon dioxide in the region. As bacteria in Arctic Ocean use the new influx of carbon as a food source, they may create CO2 as a byproduct. A second possibility, Griffith posits, is that warming temperatures and melting sea ice might boost the production of phytoplankton, tiny plant-like organisms that live near the ocean’s surface and thrive on carbon dioxide in the water. As those phytoplankton die (or are eaten by other organisms and released as waste), they would sink to the sea floor, causing the carbon in their bodies to be sequestered in thick sediments—effectively removing the increased carbon from the environment.
Also collaborating on the study were WHOI geochemist Li Xu, Fiona McLaughlin and Robie Macdonald of the Institute of Ocean Sciences, Fisheries and Oceans Canada, Kristina Brown of the University of British Columbia, and Timothy Eglinton of the Swiss Federal Institute of Technology.
Read more about:
Environment data Ice
Supplier: Woods Hole Oceanographic Institution (WHOI)
More news from this supplier:
Tracking Radionuclides in the Pacific Ocean
Crowd-funding Success for Radioactive Ocean Website
East China Sea’s Physical Oceanography Explored
Robotic Probe Launcher Could Transform Ocean Data Collection
Upgraded Alvin Sub Heads for West Coast
Sediment Analysis Unveils Historic Life in Black Sea
Gliders Detect Endangered Whales
Gulf Stream Shift Identified
Newest Navy Research Vessel to be Named Neil Armstrong
NASA and WHOI Media Briefing on Ocean Salinity Expedition
Manufacturing Agreement BetweenTriton Imaging and Applied Acoustics
Open Style Training Courses Around The World
Eiva Course at Install Academy Completed
Seatronics Invests for ROV Tooling Rental Market
NOAA Begins 180th Hydrographic Survey Season
Two Edgetech 6205 for Survey Equipment Services Katy
Sensor Fusion Applications at EGU 2014
Queen’s Award for Sonardyne 6G
Forward Looking Sonar Upgrade
2014 Global ADCPs in Action User Conferences
comments powered by Disqus
Bob Allwood (SUT) on the UUVS Conference
The UUVS 2014 conference featured speakers from Woods Hole Oceanographic Institution, Fugro, Kongsberg Maritime, Teledyne Gavia, Bluefin Robotics, SeeByte and many more. Bob Allwood, CEO of the Society for Underwater Technology (SUT) gives an overview on the outcomings of the conference and developments in the past time.