香港挂牌正版彩图4998cc
联系我们
网站地图
邮箱
旧版回顾



华为了5G手机

   文章来源: 科学传播局    发布时间: 2019-11-20 02:31:37|香港挂牌正版彩图4998cc   【字号:         】

  

  Antarctica's ice sheets are in trouble.

  What can we do to stop Antarctica's ice sheets from disintegrating and causing a huge rise in global sea levels? A trio of scientists have simulated a radical geoengineering project to dump 7.4 trillion tons of snow on Antarctica, suggesting it could stop runaway instability in the glaciers.

  Recent studies have shown warmer ocean water is being pushed toward the colossal West Antarctic ice sheet, destabilizing it and speeding up the decline of its huge glaciers. The threat of these huge ice deposits falling into the ocean is immense and the overall effect of their decline has been calculated to eventually raise sea levels by approximately 10 feet (3 meters) or more, endangering cities like New York.

  "The real concern is that many of these glaciers have a reverse bed slope, meaning that as they retreat it exposes deeper and thicker ice to the ocean," explains Sue Cook, a glaciologist at the University of Tasmania. "That is a very unstable position, and causes a positive feedback effect which accelerates the retreat (and hence contribution to sea level rise)."

  The new study, published in the journal Science Advances on July 17, proposes a drastic, decades-long geoengineering project that would pump huge amounts of ocean water to the ice sheet, adding 7,400 gigatons (7.4 trillion tons) of "artificial snowfall" and reversing the decline. Simulating the current effects on Antarctica's ice sheets and the changes they experience with increasing snowfall, the researchers were able to map out a process that could potentially halt the ice loss.

  The problem? Their suggestion would be an incredibly expensive undertaking and include immense technical challenges. The authors say it would present an "unprecedented effort for humankind."

  Mostly, the problem lies in pumping the water out of the ocean, which requires an enormous amount of energy. The study suggests constructing a series of 12,000 wind turbines to enable this process to take place and then pumping artificial snow into two glaciers on the West Antarctic coast. The team suggest that activity would result in a 2 to 5 centimeter drop in sea level but the added weight of artificial snow falling on the surface would shore up the glaciers, improving their stability.

  And the larger effects of such a scheme are yet to be ironed out. What are the lasting effects on the Antarctic ecosystem and what kind of knock-on effects would we see in ocean currents across the world? We just don't have answers to those questions right now.

  What we do know is the Earth's current default state: Burning fossil fuels and pumping tons of carbon into the atmosphere, warming the planet and causing sweeping changes like threatening a million species with extinction or, you know, the ice sheets melting. Considering the possibility of salvation in artificial Antarctic snow might be jumping a little far ahead.

  "Even if a geoengineering project such as this were possible, it certainly shouldn't detract from the other urgent action which is required to reduce greenhouse gas emissions," Cook notes.

B:

  

  香港挂牌正版彩图4998cc【这】【个】【时】【间】,**【也】【不】【能】【松】【懈】,【他】【开】【始】【吸】【收】【子】【火】,【子】【火】【是】【母】【火】【的】【养】【分】,【可】【以】【让】【母】【火】【通】【过】【吸】【收】【子】【火】【进】【行】【快】【速】【壮】【大】。【比】【自】【己】【慢】【慢】【修】【炼】,【慢】【慢】【成】【长】【要】【快】【的】【多】。 【又】【是】【一】【个】【月】【的】【时】【间】,**【在】【这】【一】【个】【月】【的】【时】【间】【中】【不】【仅】【仅】【是】【在】【吞】【噬】【子】【火】,【而】【且】【还】【另】【外】【吞】【噬】【了】【一】【株】【很】【小】【的】【母】【火】。【在】【将】【这】【一】【株】【母】【火】【吞】【噬】【之】【后】,【感】【觉】【已】【经】【呈】【现】【饱】【和】【状】【态】【了】,

  【第】【二】【年】。 【这】【一】【年】【的】【秋】【天】,【依】【旧】【是】【个】【桂】【花】【飘】【香】【的】【时】【节】。 【君】【玥】【的】【关】【注】【点】【顺】【理】【成】【章】【地】【放】【在】【了】【桂】【花】,【呃】,【不】【对】,【是】【桂】【花】【做】【成】【的】【桂】【花】【糕】【上】。 【秋】【陵】【就】【是】【个】【盛】【产】【桂】【花】【的】【地】【方】,【桂】【花】【糕】、【桂】【花】【茶】【和】【桂】【花】【酒】【都】【是】【秋】【陵】【当】【地】【有】【名】【的】【特】【产】。【秋】【陵】【出】【产】【的】【桂】【花】【蜜】【甚】【至】【被】【当】【做】【贡】【品】,【进】【献】【至】【京】【都】。 【在】【秋】【陵】【城】【的】【桂】【林】【道】【上】,【行】【人】【只】【要】【在】

  【黑】【雾】【越】【来】【越】【浓】,【李】【游】【他】【们】【的】【身】【影】【被】【包】【裹】【其】【中】,【隐】【隐】【约】【约】【能】【看】【到】,【他】【们】【站】【在】【原】【地】,【保】【持】【着】【静】【止】,【一】【动】【不】【动】,【好】【似】【陷】【入】【梦】【魇】【当】【中】。 【两】【只】【七】【彩】【鹿】【正】【在】【仓】【惶】【逃】【窜】,【后】【面】【跟】【着】【一】【群】【鬼】【物】。 “【快】,【跟】【上】【它】【们】,【撕】【碎】【了】【进】【补】【啊】!” “【不】【能】【让】【到】【手】【的】【猎】【物】【跑】【掉】,【大】【家】【加】【把】【劲】【儿】,【赶】【紧】【追】。” “【哼】,【跑】【吧】。【等】【到】【被】【我】【们】【追】【上】

  【墨】【白】【有】【幸】【摸】【了】【一】【把】【二】【哈】【柔】【顺】【的】【皮】【毛】,【二】【哈】【真】【的】【好】【好】【看】。 【瞧】【瞧】【这】【湛】【蓝】【的】【眼】【睛】,【看】【着】【都】【觉】【得】【心】【动】…… 【但】【是】【怎】【么】【看】【都】【觉】【得】【它】【挺】【欠】【揍】【的】,emm~【可】【能】【是】【错】【觉】。 【不】【得】【不】【说】,【这】【条】【狗】【的】【主】【人】【把】【这】【条】【狗】【养】【的】【很】【好】【啊】~ 【膘】【肥】【体】【壮】,【皮】【毛】【光】【滑】,【闻】【着】【都】【没】【有】【狗】【的】【腥】【臭】【味】【道】…… 【就】【是】【这】【样】【子】【莫】【名】【的】【欠】【揍】【就】【是】【了】。 【不】

  【在】【这】【一】【刻】,【叶】【辰】【真】【的】【是】【不】【知】【道】【该】【怎】【么】【说】,【两】【人】【就】【这】【么】【看】【着】【彼】【此】【陷】【入】【了】【沉】【默】。【良】【久】【后】,【叶】【辰】【率】【先】【发】【言】,【打】【破】【了】【这】【尴】【尬】【的】【局】【面】。 “【就】【以】【现】【在】【来】【说】,【你】【做】【我】【的】【追】【随】【者】【真】【的】【是】【很】【不】【明】【智】【的】【选】【择】,【我】【无】【法】【提】【供】【给】【你】【足】【够】【的】【修】【炼】【资】【源】,【这】【样】【下】【去】,【你】【的】【修】【炼】【速】【度】【就】【会】【逐】【渐】【下】【降】,【就】【如】【同】【你】【们】【狐】【族】,【会】【被】【后】【来】【者】【一】【个】【又】【一】【个】【的】【赶】【超】。香港挂牌正版彩图4998cc11 【月】 9 【日】,【吉】【林】【省】【白】【城】【市】【通】【榆】【县】【消】【防】【救】【援】【大】【队】【收】【到】【了】【一】【份】【特】【殊】【的】【礼】【物】,【一】【位】【不】【愿】【意】【透】【露】【姓】【名】【的】【女】【士】【为】【消】【防】【员】【订】【制】【了】【一】【款】 " 【火】【焰】【蓝】 " 【主】【题】【蛋】【糕】,【并】【委】【托】【店】【家】【送】【到】【了】【消】【防】【队】。【收】【到】【群】【众】【送】【来】【的】 " 【火】【焰】【蓝】 " 【主】【题】【蛋】【糕】,【消】【防】【员】【们】【可】【谓】【是】 " 【吃】【在】【嘴】【里】【甜】【在】【心】【里】 "。

  【清】【安】【侯】【世】【子】【本】【来】【看】【安】【然】【跟】【着】,【是】【没】【什】【么】【意】【见】【的】,【虽】【然】【他】【不】【喜】【欢】【柳】【氏】,【但】【柳】【氏】【好】【歹】【表】【面】【上】【是】【他】【的】【妻】【子】,【妻】【子】【跟】【着】【他】,【还】【不】【许】【人】【跟】【着】【么】?【他】【连】【不】【愿】【意】【同】【房】【的】【事】,【都】【因】【害】【怕】【得】【罪】【柳】【家】【所】【以】【做】【了】,【更】【不】【可】【能】【在】【这】【种】【无】【关】【紧】【要】【的】【小】【事】【上】【跟】【柳】【氏】【闹】【崩】,【那】【次】【吵】【架】,【要】【不】【是】【安】【然】【对】【他】【不】【好】,【他】【也】【不】【会】【跟】【她】【吵】【起】【来】【的】。 【但】【这】【时】【听】【何】【三】【娘】

  【要】【说】【在】【围】【棋】【中】,“【目】【外】”【和】“【高】【目】”【这】【两】【种】【开】【局】【起】【手】【式】【还】【是】【挺】【有】【意】【思】,【它】【们】【不】【像】“【星】【位】”,“【小】【目】”,“【三】【三】”【那】【样】【普】【通】【和】【寻】【常】,【是】【绝】【对】【的】【主】【流】【开】【局】,【这】【两】【种】【下】【法】【算】【是】【一】【种】“【非】【主】【流】”。 【但】【它】【们】【也】【不】【像】“【超】【高】【目】”,“【五】,【五】”,【以】【及】“【天】【元】”【这】【些】【开】【局】【那】【样】【罕】【见】,【后】【面】【这】【几】【种】,【以】【及】【比】【这】【更】【怪】【异】【的】【开】【局】,【那】【在】【围】【棋】

  【听】【到】【柳】【昊】【阳】【的】【询】【问】,【身】【穿】【黑】【色】【衣】【服】【的】【酒】【店】【经】【理】【连】【忙】【回】【答】【道】:“【上】【官】【公】【子】,【她】【们】【现】【在】【就】【在】【总】【统】【包】【厢】【内】【等】【您】。” “【嗯】!” 【柳】【昊】【阳】【点】【了】【点】【头】,【就】【急】【匆】【匆】【的】【进】【入】【了】【酒】【店】。 【此】【刻】,【他】【的】【心】【中】【隐】【隐】【有】【些】【激】【动】。 【他】【心】【中】【清】【楚】,【自】【己】【是】【否】【能】【够】【在】【最】【后】【关】【头】【翻】【盘】,【估】【计】【就】【要】【看】【今】【天】【晚】【上】【的】【谈】【判】【了】。 【很】【快】,【柳】【昊】【阳】【便】【来】【到】

  【红】【红】【马】【上】【飞】【过】【去】,【想】【把】【慕】【容】【雪】【倾】【抢】【回】【来】,【但】【是】,【他】【不】【能】【动】【用】【法】【术】【将】【她】【移】【走】。 “【啊】~”【抓】【着】【自】【己】【头】【顶】【的】【彼】【岸】【花】,“【老】【天】【呐】,【告】【诉】【我】【该】【怎】【么】【办】?” 【见】【君】【邪】【痕】【把】【慕】【容】【雪】【倾】【抱】【走】,【红】【红】【马】【上】【跟】【上】【去】,【即】【便】【不】【能】【把】【姐】【姐】【带】【走】,【但】【是】【也】【能】【监】【督】【君】【邪】【痕】,【不】【让】【姐】【姐】【受】【到】【欺】【负】。 【将】【慕】【容】【雪】【倾】【抱】【出】【池】【子】,【来】【到】【了】【一】【个】【环】【境】【清】【幽】【安】




(责任编辑:中科院)

附件:

专题推荐

相关新闻


友情链接:东方心经12集图|香港正版马会另版挂牌|神算子今晚六会彩创富资料|竞彩网|穷游网|苹果手机

地址:肇庆高新技术产业开发区大马路31号 邮编:100977

© 2012 - 2019 BC.杀手 版权所有 京ICP备09007985号  京公网安备110103600079号   联系我们