What's New Archive
The worldwide Argo float array of over 3,000 devices made its one-millionth profile in the beginning of December. Measuring temperature and salinity in the first 3,000 feet of the ocean, the Argo float array helps scientists better understand changes in ocean heat content and salinity.
PMEL currently has 476 active Argo floats mostly in the Pacific Ocean, making up 13% of the worldwide array. You can find out more about PMEL’s Argo floats and where they are located on their website.
The Arctic region continued to break records in 2012 - among them, the loss of summer sea ice, late spring snow cover, and melting of the Greenland ice sheet - as the region settles into a new state. This was true even though air temperatures in the Arctic were unremarkable relative to the last decade.
Major findings include record lows in snow and Arctic sea ice extent, record setting glacier and Greenland ice sheet melt, and greening of the tundra, with varied impacts on marine and terrestrial ecosystems.
In a study published November 25 online in Nature Geoscience, PMEL's Dr. Nina Bednarsek and co-authors describes the first evidence of anthropogenic carbon dioxide dissolving the shells of marine snails, known as pteropods, in the Southern Ocean. These findings, discovered during a 2008 science cruise, are some of the first documenting the impacts of ocean acidification on marine organisms in their natural environment.
PMEL's Dr. Richard Feely is a co-author. For more information on ocean acidification please visit the PMEL Carbon website.
Scientists at NOAA’s Center for Tsunami Research at PMEL modeled the most recent tsunami event at the end of October. On October 27 a 7.7 magnitude earthquake struck off the coast of British Columbia and sent measurable tsunami waves across the Pacific Ocean. Tsunami wave size and arrival times were accurately predicted for many U.S. coastline communities thanks in part to PMEL’s tsunami forecast model and tsunami detection buoys (DART®). Scientists will use this data to help further refine their models to assist with future tsunami events.
Please visit the tsunami event page to see model comparisons with actual tide gage data.
JISAO scientist, Dr. Kevin Wood, along with NOAA and the U.S. National Archives are teaming with Old Weather and thousands of citizen volunteers to transcribe climate data from historical ship logbooks into modern digital formats that can be used to extend modern global climate data sets to earlier times in order to better understand the climate of today.
Visit the new Arctic Rediscovery website which includes a gallery of photos revealing fascinating details of life on historical ships in the Bering Sea/Arctic, related student projects, and other resources.
A study led by PMEL's Dr James Overland, published in the October 10 issue of Geophysical Research Letters, shows how changes in summer Arctic wind patterns contribute not only to unprecedented loss of Arctic sea ice, but could also bring about shifts in North American and European weather.
Dr. Overland and others shows a change in the summer Arctic wind pattern over the past six years when compared to patterns for the previous 20 years. For more information see the NOAA press release.
PMEL engineers have successfully deployed two moorings in the Atlantic Ocean as part of NASA’s multi-year Salinity Processes in the Upper Ocean Regional Study (SPURS). The moorings are the first to a PMEL invented device, called a prawler that crawls up and down the mooring line measuring temperature and salinity along the way. The prawler, about the size of a paint can, will measure the upper 1,600 feet of the ocean and uses wave energy to crawl back to the top to begin another profile.
PMEL’s Dr. Bob Embley and JISAO’s Dr. Joe Resing will lead an expedition back to the NE Lau Basin near Fiji to map hydrothermal sites and re-visit the explosive West Mata volcano. Discovered in 2008, the West Mata volcano is the deepest active underwater volcano ever caught on film (watch how it was discovered in the YouTube video above).
You can follow along with the expedition on NOAA’s Ocean Explorer website from September 9-26, which includes daily logs and a live feed from the seafloor.
In papers published in the Journal of Geophysical Research – Oceans and Pure and Applied Geophysics, scientists from NOAA’s Center for Tsunami Research at PMEL and the University of Washington estimated, for the first time, the total energy of the 2011 Japan tsunami from measurements made in real time during the tsunami propagation.
When using the new energy estimate in tsunami computer models, the model results matched actual tsunami flood levels along the coast of Japan with much higher accuracy than models run without the energy estimate. These results will help scientists to further improve the tsunami forecast system.
The Carbon Group in partnership with PMEL engineers will be sailing, gliding and diving their way along the West Coast from July to September to continue time series measurements of carbon dioxide and ocean acidification conditions along the coast.
By using data from ships, buoys, surface and subsurface gliders, PMEL and partners hope to demonstrate how all these observation systems can work together to help paint a more accurate picture of ocean acidification off the U.S. West Coast. Explore more at the Carbon Group website.