Canjin yanayi yana nufin kwanaki suna samun tsawon, masana kimiyya sami

Climate change means days are getting longer, scientists find

 

Powered by Guardian.co.ukWannan labarin mai taken “Canjin yanayi yana nufin kwanaki suna samun tsawon, masana kimiyya sami” ya rubuta Oliver Milman, don theguardian.com a ranar Jumma'a 11th Disamba 2015 19.00 UTC

Da tasiri na canjin yanayi na iya bayyana a overwhelmingly korau amma akwai mai haske tabo ga waɗanda suka yi jihãdi a samu isasshen lokaci a cikin yini: narkewa glaciers suna haifar da juyawa daga cikin qasa rage shi tsawon kwanakinka da mu kwana, sabon bincike ya gano.

Harvard University bincike azurta da amsa ga wani dogon gudanar conundrum kan yadda ƙunci glaciers ake shafi juyawa da axis na Duniya, Ana kirga cewa duration daga yini ya tsawo da wani daƙiƙa a cikin past 100 shekaru.

Birkunan za a mafi sharply amfani da Duniya ta juyawa kamar yadda glaciers narke a wani taba sauri kudi, ma'ana cewa akalla biyar ƴan daƙiƙa za a kara wa kowace rana a kan hanya na da 21st karni. Da axis na Duniya zai matsawa ma, tare da arewa iyakacin duniya saita zuwa motsa matsayi da game da 1cm (o.4in) a wannan karni.

Da bincike, da aka buga a Science Ci gaban da aka, a fili warware wani kimiyya wuyar warwarewa da aka sani da "Munk ta enigma", wanda ya zo daga wani 2002 bincike takarda ta oceanographer Walter Munk, nazarin yadda narkewa na glaciers ya canza da Duniya ta juyawa da axis.

Kamar yadda ƙasar ice daga sandunan narke saboda tashin yanayi yanayin zafi, da canjawa nauyi na ruwa a fadin duniya ya kamata haifar da canji ga axis kan abin da Duniya spins, da kadan wobble a juyawa. Har ila yau,, da kara nauyin ruwa zuwa ga ekweita zai sa Duniya rage, da yawa a cikin hanyar a kadi adadi skater zai rage idan ya ko ta kai su makamai daga bãya daga jiki.

Munk factored a cikin tasiri na karshen Ice Age 5,000 da suka wuce, a lokacin da-dab a kan baya 15,000 shekaru dã sun taimake su rage da Duniya ta juyawa. Amma, abin mamaki, ya gano cewa, ko da da talakawan teku matakin yakan na 2mm a shekara lokacin 20th karni, babu canji ga Duniya ta juyawa ko axis bayan da ta haifar da Ice Age kawo karshen.

"Akwai ya kamata jima ina da wani whopping mai girma siginar da zai zama nan da nan kamar yadda kawai daukan kwanaki ko makonni sabõda abin da melted da ruwa daga dogayen sanda don matsawa a duniya,"Ya ce Jerry Mitrovica, farfesa geophysics a Harvard University da kuma shugaban na bincike.

Mitrovica ta tawagar koma Munk ta gudanar da bincike da kuma amfani da fasahar kimiyya fahimtar da shi. Suka gano cewa Munk ya dan kadan overestimated da talakawan teku matakin Yunƙurin - shi ne a kusa da 1mm to 1.5mm kowace shekara a kan 20th karni maimakon 2mm.

Sun kuma yi amfani da wani updated model zuwa lissafin. Munk zaci Duniya ya hanzari gyara ga kankara narkewa da ya faru a matsayin Ice Age ƙare. More kwanan nan, fahimtar wannan lokaci, duk da haka, ya nuna cewa Duniya ba kamar yadda mai siffar zobe kamar yadda ake yi yanzu na dogon lokaci, a matsayin babbar kankara zanen gado sa dogayen sanda zuwa shafa da kuma ekweita zuwa kumbura fita.

Da zarar tawagar ya factored a wasu tsoma irin su tides, suka gano cewa, da gleiser narkewa na 20th karni ya haƙĩƙa sa Duniya ya rage da kuma wobble. Gudun duniya ta juyawa za a iya gauged daga ma'aunai na taurari 'matsayi dangane da Duniya da kuma madawwama biyu na tauraron dan adam, wanda dole daidaita dan kadan idan duniya ta juyawa canje-canje.

Wannan slowdown an saita zuwa sama more pronounced. The duniya talakawan teku matakin Yunƙurin yanzu a kan 3mm, bisa ga IPCC, da girma daga cikin duniya glaciers saita zuwa Slump da tsakanin 15% da kuma 85% by 2100, dangane da yadda sharply al'ummai rage greenhouse gas watsi da baya taro deforestation.

A kwanan nan, binciken ya gano cewa, a halin yanzu ritaya daga cikin duniya glaciers shi ne "tarihi unprecedented", da masana harkokin kimiyya gargadi da cewa wata babbar gleiser a Greenland cewa riko isa ruwa tada duniya teku matakan da rabin mita ya fara crumble a cikin North Atlantic Ocean. Tẽku matakin Yunƙurin kuma an ƙara rura wutar ta thermal fadada, inda teku tsiro kamar yadda warms sama.

"A tsawon yini ne yanzu a daƙiƙa fiye da karni da suka wuce amma da za su hanzarta matsayin narkewa ƙaruwa,"Mitrovica ce. "Mutane ba za a guje daga gidãjensu yi kururuwa game da karin wani daƙiƙa amma duk da haka in ji kara gaskatãwa ne ga abin da muke yi mu yanayi. Yana da wani yatsa. "

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