What's New Archive
On September 15th, NOAA researchers at Pacific Marine Environmental Laboratory (PMEL) worked with their colleagues at the University of Alaska Fairbanks (UAF) to recover three ocean gliders in the Northern Gulf of Alaska where they have been operating for the past four and half months. This mission, which was the longest ocean acidification glider operation ever conducted, was designed to better understand the impacts that glacial runoff and other biogeochemical processes have on ocean acidification in remote access, high-latitude regions.
Two carbon wave gliders, which ride at the surface of the ocean, provided surface measurements of carbon dioxide (CO2) and dissolved oxygen concentrations as well as temperature and salinity data (Plot 1). Over the course of the deployment, the two surface gliders covered more than 6,700 km and made 4,757 measurements of CO2 in the air and seawater.
Simultaneously, a subsurface Slocum glider made over 5,400 dives through the water column down to 200 m, collecting 404,912 measurements of temperature, salinity and dissolved oxygen (Plot 2) while covering a horizontal distance of over 2,700 km along the continental shelf. All of the gliders were controlled remotely and in real-time from Seattle, WA using new interface software that can be run from any laptop or handheld device, allowing the glider pilots more flexibility during operations.
During the deployment, preliminary data from all three gliders was transmitted back to PMEL where it was analyzed and used for dynamic mission planning. This allowed the two lead scientists, Dr. Jeremy Mathis at PMEL and Dr. Wiley Evans at UAF to modify the tracks of each glider to best capture changing ocean parameters throughout the spring and summer. In the coming months scientists will process and try to understand all of the data, but this mission has proven that autonomous gliders are and will be a critical component of NOAA’s mission to gather environmental intelligence in the future.
A new study led by PMEL's Dr. Jeremy Mathis, published online July 29 in Progress in Oceanography, shows that many of Alaska's economically valuable marine fisheries are located in waters already experiencing ocean acidification. The economy and livelihood of communities in southeast and southwest Alaska are expected to be particularly vulnerable to ocean acidification and have underlying factors making these communities more susceptible. Studies show that red king crab and tanner crab, two important Alaskan fisheries, grow more slowly and don’t survive as well in more acidic waters. Alaska’s coastal waters are particularly vulnerable to ocean acidification because of cold water that can absorb more carbon dioxide, and unique ocean circulation patterns which bring naturally acidic deep ocean waters to the surface.
Led by Dr. Jeremy Mathis, PMEL teamed up with the University of Alaska and the Alaska Ocean Observing System this summer and early fall to use new unmanned tools to study how melting glaciers in Alaska’s Prince William Sound may be intensifying ocean acidification in the sound and on the Gulf of Alaska continental shelf. PMEL engineers outfitted two Carbon Wave Gliders and one underwater Slocum glider with sensors to help better understand the unique processes of glacial melt water and how they change the chemistry of the water column in Prince William Sound.
PMEL is coordinating the NOAA effort on the Russian-American Long-Term Census of the Arctic (RUSALCA) cruise. The 40 day cruise left on September 1 and is being conducted to observe physical and biological environmental changes in the Northern Bering and Chukchi Seas.
The NOAA supported Arctic Report Card for 2009 was released on October 22nd. PMEL scientist Dr. James Overland and University of Washington scientist Dr. Muyin Wang contributed to the report that states that warming of the Arctic continues to be widespread, and in some cases, dramatic.
To read more about the atmosphere, sea ice, biology and other topics in the Arctic please visit the 2009 Arctic Report Card web site.
Drs. James Overland and Richard Feely will help represent the United States and NOAA at the upcoming United Nations Climate Change Conference (COP15) in Copenhagen, Denmark that begins on December 7. Dr. Overland will discuss global warming in the Arctic and Dr. Feely will talk about ocean acidification and its impacts on the marine ecosystem.
On March 16, 2010 PMEL launched a new web site to help those interested in the Arctic learn more about the longer-reaching impacts of the loss of Arctic summer sea ice with a new website, https://www.pmel.noaa.gov/arctic-zone/future/. Changes in the Arctic are not only affecting sea ice but models show that they can impact weather in the mid-latitudes as well, where a large part of the population lives.
For more information on the Arctic please visit NOAA's Arctic theme page.
Released October 21: The 2010 Arctic Report Card highlights record temperatures across Canadian Arctic and Greenland, a reduced summer sea ice cover; record snow cover decreases and links to some Northern Hemisphere weather to support the conclusion that a return to previous Arctic conditions is unlikely.
PMEL scientist Dr. James Overland, co-editor of the Arctic Report Card, describes how the Arctic climate is impacting mid-latitude weather, as seen in Winter 2009-2010, in the Atmosphere section of the report.
Please visit the 2010 Arctic Report Card web site for the full report.
In recent press, notably the New York Times, Arctic atmosphere circulation has been a hot topic. PMEL's Dr. Jim Overland explains that the Polar Vortex, a ring of winds circling the North Pole and providing a fence keeping cold air north, has broken down for the second year in a row. This breakdown allows cold air to spill south, affecting the U.S. East Coast and other regions.
NOAA has updated the Arctic Future website to reflect recent observations and add results in the Arctic Council 2011 Snow, Water, Ice and Permafrost in the Arctic assessment. Other topics include: satellites show the Arctic losing summer sea ice for the past 30 years, an increased linkage between the Arctic and mid-latitudes, and glacier melt contributing to sea level rise.
Read more at NOAA’s Arctic Future website.