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[科学美国人60秒] SSS 2019-02-11

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[科学美国人60秒] SSS 2019-02-11

SSS 20190211

sss
60秒科学节目(SSS)是科学美国人网站的一套广播栏目,英文名称:Scientific American - 60 Second Science,节目内容以科学报道为主,节目仅一分钟的时间,主要对当今的科学技术新发展作以简明、通俗的介绍,对于科学的发展如何影响人们的生活环境、健康状况及科学技术,提供了大量简明易懂的阐释。

Tune in every weekday for quick reports and commentaries on the world of science-- it will just take a minute.


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Winter storms have walloped California this year, and snow pack is piling up.But a few years back, the state was long dry by a record-breaking drought.And more dry spells will surely come." Everybody agrees that we need more water resources." ? , an oceanographer at the University of California Sante Cruise. She points out that her home country Israel once faced the same problem." Israel has water issues forever and ever, and they don't have water problems anymore because they converted pretty much ninety percent of water use to desalination." Ocean desalination hasn't enjoyed as much attraction in California due to its  cost and because of concerns that the plants would damage the coastal ecosystems both when the sea water sucked in and when left-over super salty ? are released. Now writing in the Journal Water,Paten and her team have assessed the environmental impact of the nation's largest plant, ? desalination plant of Sandiego. Here is the good news. Scuba divers reveal that the community of star fish,snails, sea cucumbers and other creatures that live on the SanDiego ocean bottom offshore have not budged since the plant opened in 2015. But the bad news,the plume of salty runoffs stayed intact much farther out than models predicted, rather than easily blending with closer sea water." When you have the pool of salty water that doesn't mix,it prevents oxygens from penetragting, so it can cause lower oxygen levels close to the bottom, and obviously all the organisms that need oxygen are not going to be happy. Ecosystems offshore from the plant were already disturbed by cooling water discharge from a power plant at the same site, she says, which could explain why the marine life was unfazed.But at more pristine sites, especially those rich in biodiversity like ? , a salty plume might do more harm. The states are already planning more ocean desalination projects up and down the coast. And Paten says her lesson is this." There is tons of water in the ocean and we can use it. We just need to do it responsibly. First step, updating our models of how salty waste water behaves offshore to ensure our thirst for drinking water doesn't cause an ecological sea change.
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