Ageananan shekarun kankara

adadin dusar kankara ya karu

Yawancinmu muna da masaniya da zamanin ƙanƙarar da aka saba yi a duniyarmu. Koyaya, a yau zamuyi magana akan karamin shekarun kankara. Ba lamari ne na duniya ba amma lokaci ne na ƙarancin glaciation wanda aka nuna shi da faɗuwar glaciers a cikin zamani. Hakan ya faru tsakanin ƙarni na 13 da 19, musamman a Faransa. Suna daga cikin kasashen da suka wahala matuka daga irin wannan zafin na zafin. Wannan yanayin sanyi ya haifar da wasu mummunan sakamako kuma ya haifar da ɗan adam dacewa da sababbin yanayin muhalli.

Saboda haka, zamu sadaukar da wannan labarin don gaya muku duk abin da kuke buƙatar sani game da ƙaramin shekarun kankara da mahimmancin da yake da shi.

Ageananan shekarun kankara

karamin shekarun kankara

Lokaci ne na yanayin sanyi wanda ya faru a Turai da Arewacin Amurka daga shekara ta 1300 zuwa 1850. Ya yi daidai da lokacin da yanayin zafi ya kasance mafi karancin abubuwa kuma matsakaita sun ƙasa da yadda aka saba. A cikin Turai wannan lamarin ya kasance tare da albarkatun gona, yunwa da bala'o'i. Ba wai kawai ya haifar da ƙarin ruwan sama a cikin yanayin dusar ƙanƙara ba, har ma ya rage yawan amfanin gona. Dole ne a yi la'akari da cewa fasahar da ke cikin wannan yanayin ba irin ta yau ba ce. A yanzu muna da kayan aiki da yawa da za mu iya sauƙaƙa mummunan yanayin da aka gabatar mana a cikin waɗannan yanayi na yanayi.

Ainihin farkon ƙaramin shekarun kankara bashi da ma'ana. Yana da wuya a san lokacin da sauyin yanayi da gaske ya fara canzawa da tasiri. Muna magana ne game da yanayin kasancewar dukkanin bayanan da aka samu cikin lokaci a wani yanki. Misali, idan muka tattara dukkanin masu canji kamar su zafin jiki, yawan hasken rana, tsarin iska, da sauransu. Kuma muna ƙara shi akan lokaci, zamu sami yanayi. Wadannan halaye suna canzawa shekara zuwa shekara kuma ba koyaushe suke da karko ba. Idan mukace yanayi yana da wani nau'i, to saboda mafi yawan lokuta yana dacewa da dabi'un masu canjin yanayin da suka dace da wannan nau'in.

Duk da haka, yanayin zafi ba ya daidaita koyaushe kuma kowace shekara suna bambanta. Saboda haka, yana da wuya a san da kyau lokacin da ya kasance farkon farkon shekarun kankara. Dangane da wahalar kimanta waɗannan abubuwan sanyi, iyakokin ƙananan shekarun kankara sun bambanta tsakanin karatun da za a iya samu game da shi.

Nazarin kan Karamin Zamanin kankara

aiki a cikin kankara shekaru

Nazarin da Laboratory na Glaciology da Geophysics na Muhalli na Jami'ar Grenoble da na Laboratory na Glaciology da Geophysics na Mahalli na Makarantar Kwalejin Fasaha ta Tarayya ta Zurich, ya nuna cewa fadada yanayin ƙyalli ya kasance saboda ƙaruwa mai yawa a hazo, amma zuwa gagarumin digo a yanayin zafi.

A cikin wadannan shekarun, ci gaban glaciers yafi yawa saboda karuwar fiye da kashi 25% na dusar kankara a lokacin sanyi. A lokacin hunturu al'ada ce don can ya kasance cikin yanayin dusar ƙanƙara a wurare da yawa. Koyaya, a wannan yanayin, waɗannan hawan sun fara haɓaka har suka wanzu a yankuna inda ba a taɓa yin dusar ƙanƙara ba a baya.

Tun daga ƙarshen Icean lokacin Icean Ice, ƙarancin glaciers ya kusan ci gaba. Duk kankarar sun yi asarar kusan kashi ɗaya bisa uku na duka ƙarfinsu kuma matsakaicin kauri ya ragu da santimita 30 a kowace shekara a wannan lokacin.

Sanadin

karamin shekarun kankara a cikin mutane

Bari mu ga menene dalilan da zasu iya haifar da ƙarancin shekarun kankara. Babu wata yarjejeniya ta kimiyya game da ranakun da dalilan da zasu iya haifar da wannan zamanin kankara. Babban musababbin na iya zama saboda ƙananan adadin hasken rana da ke faɗuwa akan saman duniya. Wannan ƙananan yanayin haskoki na rana yana haifar da sanyaya dukkan farfajiyar da canjin canjin yanayi. Ta wannan hanyar, hazo a cikin yanayin dusar ƙanƙara yana faruwa akai-akai.

Wasu kuma sun yi bayanin cewa lamarin na karamin lokacin kankara ya samo asali ne daga dutsen da dutsen ke fitarwa wanda ya kara dankon yanayi. A waɗannan yanayin muna magana ne game da wani abu makamancin na sama amma tare da wani dalili na daban. Ba wai ƙananan adadin hasken rana yana zuwa kai tsaye daga rana ba, amma duhun yanayi ne yake haifar da raguwar hasken rana wanda ke shafar saman duniya. Wasu masana kimiyya da ke kare wannan ka'idar sun tabbatar da cewa tsakanin shekarun 1275 da 1300, wanda shine lokacin da karamin kankara ya fara, Fashewar aman wuta 4 a cikin shekaru hamsin zai kasance da alhakin wannan lamarin tunda dukkansu sun faru a wancan lokacin.

Dusturar Volcanic tana nuna hasken rana a hanya mai ɗorewa kuma yana rage yawan zafin da fuskar ƙasa take karɓa. Cibiyar Bincike Kan Yanayi ta Amurka (NCAR) ta samar da samfurin yanayi don gwada tasirin fashewar tsaunin da aka maimaita, cikin shekaru hamsin. Effectsididdigar tasirin waɗannan fashewar dutsen a kan yanayi ya amince da duk tasirin sakewar dutsen da aka maimaita. Duk waɗannan abubuwan tasirin da aka tara za su haifar da Iceananan shekarun Ice. Firiji, fadada kankirin teku, canjin canjin ruwa, da raguwar safarar zafin rana zuwa gabar tekun Atlantika sune mafi yuwuwar yanayin ga Little Ice Age.

Lokutan kankara

Koyaya, dole ne a yi la'akari da cewa tsananin ƙaramin shekarun kankara ba za a iya kwatanta shi da sauran tsayi da tsawan lokaci masu girma da duniyarmu ta samu a matakin glaciation ba. Ba a san musabbabin yanayin yanayi ba amma bayan wannan abin da ya faru lokacin da kwayoyin halittu masu yawa suka bayyana. Wannan yana nufin cewa a matakin juyin halitta, shekarun kankara da suka faru a duniyarmu shekaru miliyan 750 da suka shude na iya zama tabbatacce.

Ina fatan cewa tare da wannan bayanin zaku iya ƙarin koyo game da ƙaramin shekarun kankara da halayenta.


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