Next month, researchers in the U.K. will start to pump water nearly a kilometer up into the atmosphere, by way of a suspended hose. The experiment is the first major test of a piping system that could one day spew sulfate particles into the stratosphere at an altitude of 20 kilometers, supported by a stadium-size hydrogen balloon. The goal is geoengineering, or the "deliberate, large-scale manipulation of the planetary environment" in the words of the Royal Society of London, which provides scientific advice to policymakers. In this case, researchers are attempting to re-create the effects of volcanic eruptions to artificially cool Earth.
The $30,000 test, part of a project called Stratospheric Particle Injection for Climate Engineering (SPICE), is inspired by the 1991 eruption of Mount Pinatubo in the Philippines. That volcano spewed 20 million tons of sulfate particles into the atmosphere, cooling Earth by 0.5 degree Celsius for 18 months. If the British feasibility tests are successful, the balloon-and-hose contraption could be used to inject additional particles into the stratosphere, thereby reflecting more of the sun's energy back into space, and hopefully curbing some of the effects of global warming.
October's tests will mainly focus on whether the balloon-and-hose design could be an effective method to deliver the sunlight-reflecting particles. At an airfield in Norfolk, England, that is no longer in use, a helium blimp will hoist a regular pressure-washer hose one kilometer off the ground. An off-the-shelf pressure washer will pump up 1.8 liters of tap water per minute, to a maximum of 190 liters, which will evaporate or fall down to the ground locally. The researchers will monitor the performance of the system, and use the data to design the larger 20-kilometer-high setup.
This is a Suspicious News Brief. Read more at Scientific American
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