Sea Technology

AUG 2012

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

Issue link: http://sea-technology.epubxp.com/i/77248

Contents of this Issue

Navigation

Page 69 of 79

oceanresearch Observatory Network Deployed Off West Coast of France The pilot project undersea Marine e- Data Observatory Network (MeDON) was successfully installed in June in the Iroise Natural Marine Park, off the west coast of France. The observatory com- prises 2.5 kilometers of cable, linking high-definition cameras, acoustic arrays and instrument nodes. The cable has a supply of 440 volts, which is stepped down to 12 volts to power the instru- ments. Scientists from the French Research Institute for Exploration of the Sea (IFRE MER) and the École Nationale Supériere de Techniques Avancées, Bretgagne (ENSTA, Brittany) will monitor the cam- eras and acoustic arrays to obtain im- ages and sounds of dolphins and other marine life against a background of fish- ing and boating activities in the marine park. Software is being developed to iden- tify sound-producing creatures, includ- ing clams and whales. Having baseline acoustic data will inform future deci- sions regarding acceptable noise levels in coastal waters, ensuring minimal dis- turbance to marine mammals and com- plying with European Union standards of marine environmental quality. MeDON will gather data on temper- ature, salinity, fluorescence, turbidity and oxygen levels to aid the under- standing of local conditions and how they vary annually and with the sea- sons, as well as the effect of climate change and water- and land-based human activities. MeDON is presently a three-year project, but the cable and instruments will stay in place so scientists can con- tinue to collect data for an additional 12 months. A second observatory on the U.K. side of the Channel and a cross-channel observatory to link the two are future possibilities. OOI's Regional Scale Node Network Set for Installation The installation of the primary nodes for the Ocean Observatories Initiative's (OOI) Regional Scale Nodes (RSN) ca- bled network is scheduled for comple- tion this summer.The nodes will be the seven main connection points for power 70 st / AUGUST 2012 and communications. Instal lation of the first node was scheduled for July, and the last node is scheduled for August. The RSN will be the first U.S. regional cabled observatory, establishing an in- teractive network of sensors, instru- ments and moorings connected by 900 kilometers of electro-optical cable. L3-MariPro (Goleta, California), TE SubCom (Morristown, New Jersey), the University of Washington and the Con- sortium for Ocean Leadership are col- laborating on node installation. The infrastructure is designed to op- erate continuously for 25 years and is scheduled to become operational in 2014. The RSN cables extend to two main study sites: Hydrate Ridge, located at the base of the Oregon continental mar- gin approximately 120 kilometers southwest of Pacific City, Oregon, and Axial Seamount, located 500 kilometers west on the Juan de Fuca Ridge. The cables also will serve the OOI's Coastal Scale Nodes Oregon Line at the Endurance Array site. Two primary nodes will be installed at Hydrate Ridge, two at Axial Seamount, two on the Endurance Line and one in the mid- dle of the Juan de Fuca plate. Once connected to the cable, each primary node will provide land-to-sea communication and supply instrument arrays up to 10 gigabits per second of communication bandwidth and 8 kilo- watts of power. Data will be collected from the sur- face to the seafloor, transmitted by cable and made publicly available in near real time via the Internet. Forereef Coral Found to be Most Vulnerable to Global Warming Marine scientists at the University of North Carolina at Chapel Hill (UNC) have linked the decline in growth of Caribbean forereef corals to long-term trends in seawater temperature. The re- search was conducted on the Meso - american Barrier Reef System in Belize, and the results were published in July in Nature Climate Change. In February 2009, researchers ex- tracted 13 core samples from massive starlet corals on the reef and measured the thickness of their annual growth bands to estimate growth rate trends www.sea-technology.com over the last 100 years. They found a de- cline in skeletal growth in corals closest to the open ocean, with growth in corals from the nearshore and the back- reef relatively unchanged. The scientists gathered sea surface temperatures for the study site from 1982 to 2008 from NOAA's database. They compared them with seawater temperatures from temperature loggers installed at the study site in 2002. Historically, corals in the area closest to the open ocean have seen cooler and more stable seawater temperatures, while those located closest to the shore and behind the reef crest have experi- enced warmer and more variable sea- water temperatures. Since 1982, the average summer sea surface tempera- ture has been increasing in all three reef zones. Skeletal growth declined from 1982 to 2008 in the zone closest to the open ocean, while coral growth rates re- mained relatively stable over that same period in the other two reef zones. This suggests fore reef corals may be most vulnerable to global warming. The researchers collected additional coral core samples this summer across the entire reef system for further study. CSIRO, NOAA Sign Agreements for Collaboration Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO) and NOAA signed in July a se- ries of agreements designed to facilitate ongoing collaboration between the two organizations and to provide a forum for discussions about broadening coopera- tion and emerging issues and opportu- nities. The agreements build on a memoran- dum of understanding signed in Febru- ary 2010. They cover research on the El Niño Southern Oscillation phenome- non, ocean observations and climate variability across the Pacific, the South- ern Hemisphere regional carbon cycle and ocean acidification, ecosystem- based management of marine re- sources, and initiatives to promote scientific exchanges and collaborative workshops. CSIRO has collaborated previously with NOAA through CSIRO Marine and Atmospheric Research and the CSIRO Wealth from Oceans Flagship, includ- ing research voyages, ocean monitoring programs and global atmospheric sam- pling of greenhouse gases.

Articles in this issue

Links on this page

Archives of this issue

view archives of Sea Technology - AUG 2012
loading...
Sea Technology
Welcome!
If you're not a subscriber, please click here.