Sea Technology

AUG 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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60 st / August 2017 www.sea-technology.com Explore, Learn, Share! Join Teledyne Marine for their newly expanded users' workshop in which speakers, influencers, and attendees from around the globe will converge to explore, learn and share their experiences on a broad range of products, applications and technology. This intensive workshop, which is preceded by a day of networking events, will include customer presentations, product/software training, field service meetings, dockside and on-water demonstrations provided by Teledyne Marine's twenty-three industry-leading brands. Products will include: ADCPs, CTDs, DVLs, Imaging and Mapping Sonars and Software, Motion Sensors, Navigation Systems, AUVs, ROVs, Lights and Cameras, Modems, Gliders, Surface Vehicles, Interconnect Solutions—and more! Teledyne Marine Technology Workshop October 15-18, 2017 • Catamaran Resort San Diego, CA, USA For all the information, visit: www.teledynemarine.com/TMTW2017 www.teledynemarine.com news concerning Kepone contamina- tion in the James River. About a third of fish samples from the James contain no detectable trace of this now-banned pesticide, but two-thirds still do—more than 40 years after its discharge into the river was first reported. None of the fish had Kepone levels above the "action limit" established by the U.S. Food and Drug Administration to control levels of contaminants in hu- man food. Kepone in fish tissues has continued to decline exponentially since 1980 and should be near or below the de- tection limit in all samples by 2020 or 2025 if current trends continue, but the fact that 65 percent of fish still have re- portable Kepone concentrations shows just how difficult it is to rid an ecosys- tem of a persistent toxic chemical. Tackling Land Sources of Marine Debris in US Virgin Islands The University of the Virgin Islands is teaming up with the NOAA Marine Debris Program to reduce land-based sources of marine debris in the U.S. Virgin Islands through a targeted ridge- to-reef and watershed educational and outreach program. The project runs from August 2016 to December 2017. Approximately 80 percent of marine debris comes from land-based sources and enters the marine environment in a number of ways, such as through ineffective or improper waste man- agement, lack of recycling options, littering, illegal dumping, or through streams and stormwater runoff. Ma- rine debris can damage habitats, harm wildlife and have negative economic impacts on coastal communities. Observing Antarctica via Highly Precise Positioning At the end of last year, the De- moGRAPE consortium observed for the first time ever ionospheric scintilla- tions on Galileo signals in Antarctica, using Septentrio's PolaRx5S GNSS ref- erence receiver. DemoGRAPE investigates improve- ment of high-precision satellite po- sitioning with a view to developing scientific and technological applica- tions in Antarctica. At higher latitudes, GNSS signal degradation due to iono- spheric activity is more pronounced. The more precise phase-based posi- tioning modes are particularly vulner- able to ionosphere disturbance such as scintillations. Elevated ionospheric activity can cause a loss of precise- positioning mode or, in more extreme cases, a total loss of signal lock. Arctic Winter Warming On the Rise Arctic winter warming events— winter days when temperatures peak above -10° C—are a normal part of the Arctic climate over the ice-covered Arctic Ocean, but new research finds they are becoming more frequent and lasting longer than they did three de- cades ago. A new study analyzing winter air temperatures over the Arctic Ocean from 1893 to 2017 shows that since 1980, an additional six Arctic winter warming events are occurring each winter at the North Pole, and these events are lasting about 12 hours lon- ger, on average, the American Geo- physical Union reported. Warmer winter air temperatures may further impede ice growth and expansion, accelerating the effects of global warming in the Arctic. The study attributes the increase in warming events to an increase in major storms in the Arctic. ST

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