The global system of submarine telecommunication cables that support our connected world is deaf, dumb and blind to the external ocean environment and represents a major missed opportunity for tsunami warning and global climate monitoring, according to University of Hawaii scientists and a United Nations task force.
For an additional 5 to 10 percent of the total cost of any new cable system deployment, we could be saving lives from tsunamis and effectively monitoring global change, said UH-Manoas Rhett Butler, director of the Hawaii Institute of Geophysics and Planetology and chairman of an international committee tasked to evaluate the cable opportunity.
Submarine telecommunication cables are the backbone of the Internet. More than half a million miles of the fiber-optic cable already criss-cross the deep ocean, linking more than 2.7 billion users and supporting global business, finance, social media, entertainment and political expression.
Now researchers are making a scientific and societal case for greening any new cables proposed to be built in the future.
The new report, published this month by a joint task force of three U.N. agencies, parallels an engineering feasibility study and analyses of strategy and legal challenges.
By adding a relatively straightforward set of instrumentation, accelerometers, high-resolution pressure gauges and thermometers integrated into the cables optical repeaters, the enhanced telecom cables could answer many basic science needs, as well as help monitor the physical state-of-health of the cable system itself, researchers say.
For example, a cable-based worldwide network of seafloor sensors could enable the monitoring of the pressure of a tsunami as it passes over the sea floor, allowing the measurement in real-time of the actual tsunami generated to assess its potential coastal threat and corroborate the necessity of a warning.
Likewise, global earthquake monitoring is hamstrung by the fact that nearly all of the worlds seismic stations are located on land. A smarter undersea cable system could significantly improve the resolution at which researchers can describe the earthquake process itself including how, where and how much the earthquake moves over its fault surface, details that are fundamental to understanding its tsunami-generating potential.
On the climate side, readily available sensor technology could be deployed to improve our understanding of ocean circulation, sea level rise and the exchange of heat through the ocean depths and with the atmosphere, essential elements for global monitoring.
The undersea communication cable is an untapped platform for oceanographic sensors, one that could outstrip all other systems attempting to observe the deep oceans, said Doug Luther, UH-Manoa professor of oceanography and another contributor to the report.
The rest is here:
UN task force: Ocean telecom cables should be green
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