Taron shekara 8.2-kilo

A cikin ilimin yanayi, taron kiloyear 8.2 ya kasance saurin raguwa a yanayin zafi na duniya wanda ya faru a kusa da shekaru 8,200 da suka gabata, wanda ya kasance tsakanin ƙarni biyu zuwa huɗu. Wannan taron ya nuna farkon zamanin Arewacin Girbiya a cikin zamanin Holocene. Duk da yake wannan lokacin sanyaya ba shi da ƙarfi kamar lokacin Younger Dryas na farko wanda ya faru kafin Holocene ya fara, har yanzu yana da mahimmanci. A lokacin Taron kilo-shekara 8.2, matakan methane na yanayi sun ragu da kashi 80 a kowace biliyan, raguwar 15%, yana ba da shawarar yanayin sanyaya da bushewa a duk faɗin Arewacin Hemisphere.

 Bayyanawa 
Wani mai saurin sanyi a kusa da shekaru 8,200 da suka wuce ya fara gano shi ta hanyar masanin ilimin halittu na Swiss Heinrich Zoller a cikin 1960, wanda ya kira taron Misox oscillation na Val Mesolcina .  Ana kuma san shi da taron Finse a Norway .  an samu shedar taron kilo-shekara 8.2 a cikin kididdigar tatsuniyoyi a fadin Eurasia, Bahar Rum, Kudancin Amirka, da Kudancin Afirka, wanda ke nuni da cewa taron ya yi daidai da duniya .  Shaida mafi ƙarfi ga taron ta fito ne daga yankin Arewacin Atlantic ; Rushewar yanayi yana nunawa a fili a cikin ƙananan ƙanƙara na Greenland, bayanan sedimentary, da sauran bayanan yanayin yanayi da na wurare masu zafi na Arewacin Atlantika.    Akwai ƙarancin shaida a cikin ƙananan kankara daga bayanan Antarctica da Kudancin Amurka.   Sakamakon raguwar zafin jiki ba zato ba tsammani ya kasance na duniya, musamman canjin yanayin teku.

 Abin da ya faru na sanyaya 
Lamarin na iya haifar da babban bugun ruwa mai narkewa,  wanda mai yiwuwa ya samo asali ne daga rugujewar karshe na Laurentide Ice Sheet na arewa maso gabashin Amurka ta Arewa,    mai yiwuwa lokacin da tafkunan glacial Ojibway da Agassiz suka shiga cikin Arewacin Tekun Atlantika.  Irin wannan aikin ya haifar da ambaliya ta Missoula wadda ta kafa Channeled Scablands na Kogin Columbia . Ruwan narkewar ruwa na iya shafar yanayin yanayin zafi na Arewacin Atlantika,    yana rage jigilar zafi na arewa a cikin Tekun Atlantika kuma yana haifar da sanyayawar Arewacin Atlantic.  Tsarin jujjuyawar juzu'i na meridional na Atlantic (AMOC) ya raunana da 55%  ko 62%.  Ƙididdiga na sanyaya sun bambanta kuma sun dogara kaɗan akan fassarar bayanan wakili, amma raguwa na kusan  an ruwaito. A Greenland, taron ya fara a 8175 BP, kuma sanyaya ya kasance 3.3 ° C a ƙasa da matsakaicin matsakaici a cikin ƙasa da shekaru 20. Mafi yawan lokacin sanyi ya kasance kusan shekaru 60, kuma tsawon lokacinsa shine kusan shekaru 150.   Hasashen sanadin narkewar ruwa shine, duk da haka, ana ɗaukarsa hasashe ne.  saboda rashin daidaituwa tare da farawa da kuma yankin da ba a sani ba na tasiri.

 Manazarta