What's New Archive
PMEL Senior Scientist, Dr. Richard Feely, served on a panel with other expert scientists to help west coast decision-makers manage and adapt to changing environmental conditions. Ocean acidification and hypoxia, low dissolved oxygen, are two coastal ocean phenomena that threaten the health of marine ecosystems and marine organisms. Each can also have profound impacts on coastal economies and culturally important resources, such as fish and shellfish. The US West Coast and British Columbia will face some of the earliest, most severe impacts and expansion of hypoxic zones, due to climate change, and the acidification of ocean waters resulting due to the absorption of human-derived carbon dioxide emissions.
The connection between these two phenomena is addressed in the Science Panel’s report released April 4th. The report summarizes the latest scientific literature and presents management options to reduce stresses on marine ecosystems and enhance the ability of organisms to cope with changing conditions. Leaders in coastal regions can use this as a model on how to develop science-based strategies for reducing the threat of changing ocean conditions.
Members of the PMEL Ocean Climate Stations Project (OCS) and Carbon Program recently published two companion papers describing ocean processes in the North Pacific that play a role in the Earth’s climate system. Dr. Meghan Cronin and her co-authors examined the exchanges of heat and salt affecting the mixed water layer of the upper ocean, which can have an effect on weather and climate. Using data from the OCS KEO and Station Papa moorings, plus satellites, Argo floats, and a glider, the authors closed the heat budgets at KEO and Papa, and also closed the salt budget at Papa. Their results suggested a diffusivity coefficient could help close the mixed layer budgets of other ocean properties. Building on these results, Dr. Andrea Fassbender and her co-authors used this coefficient to close the carbon budget at Station Papa, providing new insights about the carbon cycle and climate responses in this region.
Registration for 2016 NOAA Science Camp is now open! NOAA Science Camp is held at the NOAA Campus in Seattle, WA and introduces both middle and high school students to the diverse range of careers and research conducted by our scientists. Three programs are offered: Middle School Science Camp, High School Junior Leadership Program and new this year, a Remotely Operated Vehicle Mini Session. PMEL scientists (NOAA and JISAO) lead activities relating to engineering and oceanography including what scientists do when they go to sea, how scientists work with engineers to solve complex marine questions, how currents and trace chemicals move throughout the ocean, and even how buoys help predict large-scale climate events such as Tsunamis. The camps will run at various times from July 11-26.
Right from the beginning of 2016 new records have been set in the Arctic: warmest air temperature on record in both January and February, and the lowest sea ice cover in February. The average temperature anomaly has reached a record of 5.8°C (10.4°F) for January and 4.56°C (8.2°F) for February. This is the warmest period in the Arctic for these two consecutive months since 1948. The Arctic sea ice extent for February 2016 averaged 14.2 million square kilometers (5.5 million square miles), the lowest February extent in the satellite record. Once Arctic scientists at PMEL put this past January and February into historical perspective, they saw that this unusual warmth is unprecedented in both months. This unprecedented warmth is mainly due to the large positive temperature anomalies in the Arctic Ocean and over the North American continents. This year’s record high temperature and low sea ice cover increases concerns about what will happen next in the Arctic and globally.
Read the full story on NOAA Arctic theme page.
PMEL scientists have analyzed the recordings collected from a successful deployment of a deep-ocean hydrophone mooring in Challenger Deep in the Mariana Trench. The Challenger Deep is the deepest known location in Earth's oceans, about 36,000 feet (10,971 meters) beneath the ocean surface. It is located in the Pacific Ocean near Guam. The recordings captured a baleen whale’s call, a magnitude 5.0 earthquake, an overhead typhoon and ship traffic noise. PMEL, in collaboration with the crew of the Coast Guard Cutter Sequoia and with funding from NOAA’s Office of Ocean Exploration and Research, deployed the hydrophone on January 17, 2015 for 22 days. The purpose of the project was to establish a baseline for noise in the deepest part of the Pacific Ocean.
This map shows the timeframe (year) in which the anthropogenic trend becomes distinguishable from internal climate variability. The darker red indicates earlier emergence of the trend while the orange/white areas show emergence later on. The blue stars indicate current ocean carbon sampling locations.
The ocean absorbs a significant fraction, about 40%, of carbon released by fossil fuel burning, thereby reducing climate warming. However, natural climate variability makes it difficult to directly observe trends in the amount of anthropogenic carbon the ocean is taking up with time. PMEL scientist and collaborators utilized a modeling approach to separate out the ocean carbon trend due to man-made carbon emissions from this variability. This separation illustrates the timeframe over which we may expect to observe human driven change in carbon uptake in different ocean regions. The results show that these trends are largely not detectable at present, but may begin to emerge in certain regions between 2020-2050. The Southern Ocean and Atlantic region are projected to show this uptake first, while the latest emergence occurs in the Pacific and Indian subtropical regions.
NOAA scientists and collaborators have just published a review article in Annual Review of Marine Science that summarizes our GO-SHIP repeat hydrography efforts conducted since the early 1990’s across the global oceans. The article found that the ocean is taking up a large fraction of the carbon dioxide and most of the excess heat caused by fossil-fuel burning and land use changes. Roughly 27% of the carbon dioxide released into the atmosphere by human activities is stored in the ocean, which in turn lowers the pH in the upper ocean. The ocean is taking up most of Earth's excess anthropogenic heat, with about 19% of this excess in the deep ocean beneath 2,000 m, dominated by Southern Ocean deep-ocean warming. The global hydrography has mapped dissolved organic carbon, a large, bioactive reservoir, for the first time and quantified its contribution to export production (∼20%) and deep-ocean oxygen utilization.
PMEL’s Argo float group relies upon and is very grateful for assistance from scientists and crew in deploying PMEL Argo floats on a variety of ships in oceans around the globe. PMEL Argo recently sent six floats to the R/V Falkor of the Schimdt Ocean Institute for deployment on a science cruise studying oxygen minimum zones across in the tropical Pacific. Float deployments during this cruise helped to fill a coverage gap in the Argo array that had opened up in this crucial region during a significant El Niño. As an unexpected bonus, artist-at-sea Michelle Schwengel-Regala was yarn-bombing on the Falkor during this cruise. Here are pictures of two PMEL Argo floats on the Falkor nestled in her dazzling knitted float-cozies! The yarn was removed and repurposed prior to deployment of the floats, all of which are now reporting vital ocean temperature and salinity data back from the tropical Pacific, monitoring the evolving El Niño.
NOAA scientists and collaborators from Lawrence Livermore National Laboratory have just published a paper in Nature Climate Change that shows that approximately half of the global ocean heat content increase since 1865 has occurred over the past two decades. This study included ocean temperature measurements that went as far back as the 19th century and compared them with a suite of climate models to analyze changes over time. While the majority of measurements are from the upper ocean, study results show the deep ocean is storing an increasing fraction of the Earth's net heat uptake as a result of global warming with time. To get more temperature measurements of the deep ocean, PMEL is working with university partners to develop and deploy regional pilot arrays of Deep Argo floats, which can measure to depth of 6,000 meters.
PMEL Scientists have identified four new hydrothermal vent sites along the Mariana Back-Arc. The region was systematically surveyed over the course of a 28 day cruise aboard the R/V Falkor that was just completed. In addition to the new sites, the scientists identified that one site had evidence of a recently erupted lava flow. The lava flow is the deepest historical eruption yet discovered (at 4100-4450 meters deep) and the first to be found along a slow-spreading ridge.
Read the press release and the cruise blog, both from the Schmidt Ocean Institute which supported the cruise by providing ship time and equipment. The mission was also supported by NOAA Ocean and Research Program and NOAA’s Pacific Island Regional Office.