欢迎来到天天文库
浏览记录
ID:40572814
大小:47.50 KB
页数:6页
时间:2019-08-04
《Tons Of Methane Gas Could Be Trapped Under Antarctica》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、BOBDOUGHTY:ThisisSCIENCEINTHENEWS,inVOASpecialEnglish.I’mBobDoughty.SHIRLEYGRIFFITH:AndI’mShirleyGriffith.Today,wetellaboutmethanegasthoughttobetrappedunderice-coveredareasofAntarctica.WealsotellaboutthegrowinguseofgenericdrugsinfightingHIV,thevirusresponsi
2、bleforAIDS.AndwehaveareportonthesearchforaneffectivevaccineagainstHIV.(MUSIC)BOBDOUGHTY:Aninternationalteamofscientistshasfoundthatuptofourbilliontonsofmethanegascouldbetrappedunderice-coveredareasofAntarctica.Thescientistssayextremelysmallorganismsmayhavec
3、hangedancientorganicmatterintomethane.Andtheysayifenoughicemelts,itispossiblethatenoughofthegascouldescapeandaddtothewarmingofEarth’satmosphere.JemimaWadhamofBristolUniversityinBritaindirectedthestudy.Shesaystheamountoforganiccarbonrecordedismorethantentime
4、sthesizeofallcarbonsuppliesinEarth’snorthernpermafrostareas.ThejournalNaturepublishedherreportaboutthefindings.SandraArndtalsoworkedonthestudy.Atthetime,shewaswithUtrechtUniversityinTheNetherlands.Shesaysthehighpressureandcoldtemperaturesundertheicemakegood
5、conditionsforformingmethanehydrate.Andshesaysitwasnotsurprisingthatthestudyconfirmedthepresenceofmethanehydrate.Thesubstanceisasolidsimilartoice.Itisformedwhenmethanegetstrappedwithinastructureofwatermolecules.SHIRLEYGRIFFITH:ThecontinentofAntarcticaismainl
6、yovertheSouthPole,almosttotallysouthoftheArcticCircle.Thescientistssaytheorganicmaterialcamefromaperiodthirtyfivemillionyearsago.Atthattime,Antarcticawasmuchwarmerthantodayandcontainedlifeforms.ResearcherSlawekTulaczykoftheUniversityofCaliforniaatSantaBarba
7、radescribedhowmethaneformed.Shesaidsomeoftheorganicmaterialbecametrappedinmaterialthathadfallentothebottom.Shesaidthesesediments,inherwords,werethen“cutofffromtherestoftheworldwhentheicesheetgrew.”ThescientistssayfiftypercentoftheWestAntarcticicesheetandtwe
8、nty-fivepercentoftheEastAntarcticsheetareonsedimentarybasins.Theysaidtheseareasholdabouttwentyonebilliontonsofcarbon.BOBDOUGHTY:TheAntarcticIceSheetcoversland,butnotthesurroundingsea.Methanehydratesare
此文档下载收益归作者所有