Sabon sanyi

Sabon sanyi
Bayanai
Ƙaramin ɓangare na	glaciation (en)

Yanayin zafi na kankara na Greenland wanda aka fassara tare da isotope 18O daga ƙwayoyin kankara 6 (Vinther, B., et al., 2009)

Neoglaciation ("sabunta glaciation") ya bayyana yanayin sanyaya da aka rubuta a cikin Yanayin Duniya a lokacin Holocene, biyo bayan koma baya na glaciation na Wisconsin, lokacin glacial na baya-bayan nan. Neoglaciation ya bi Hypsithermal ko Holocene Climatic Optimum, wuri mafi zafi a cikin yanayin duniya a lokacin matakin Interglacial na yanzu, ban da karuwar zafin jiki da ya haifar da dumama ta duniya wanda ya fara a karni na 20. Neoglaciation ba shi da alamar farawa ta duniya, musamman ba a cikin yanayin zafi na Greenland Icecore ba: yanayin gida da yanayin muhalli ya shafi farkon yanayin da ya fi sanyi (da rigar). Yana, misali, a bayyane a cikin bambancin iyakar itacen Alpine na kwarin Kauner, dukansu an nuna su tare a cikin jadawalin H. J. Holm a ƙarƙashin Holocene.

An motsa shi ba tare da jinkiri ba ta hanyar sake zagayowar Milankovitch, lokacin rani mai sanyi a cikin latitudes mafi girma na Arewacin Amurka, wanda zai daina narke dusar ƙanƙara ta shekara-shekara gaba ɗaya, an rufe su da farko ta kasancewar kankara mai ɓace a hankali, wanda ya ci gaba da daɗewa bayan lokacin da aka lissafa mafi girman zafi na rani: "ana'a iya cewa neoglaciation ya fara lokacin da sanyaya ya kama da dumama", in ji E. C. Pielou. Tare da ƙarshen "Little Ice Age" (tsakiyar ƙarni na 14 zuwa ƙarshen ƙarni na 19), neoglaciation ya bayyana an juyar da shi a ƙarshen ƙarni ya 20, a bayyane yake ya haifar da dumamar duniya. Neoglaciation an yi alama ta hanyar komawa baya daga yanayin zafi na Climatic Optimum da ci gaba ko sake fasalin kankara waɗanda ba su wanzu ba tun zamanin kankara na ƙarshe. A cikin tsaunuka na yammacin Arewacin Amurka, tsaunuka masu kankara waɗanda suka narke gaba ɗaya sun sake fasalin jim kadan kafin 5000 BP. Sashe mafi tsanani na mafi kyawun lokacin neoglacial, musamman a Turai da Arewacin Atlantic, ana kiransa "Little Ice Age".

Ginin yanayi na Holocene da rikodin ci gaba na kankara daga yammacin Kanada. Bayanan da aka tattara daga binciken da aka buga

A Arewacin Amurka, neoglaciation yana da tasirin muhalli a yaduwar muskeg a kan ƙasa mai laushi, mai laushi mara kyau, kamar gadon Tafkin Agassiz da aka zubar kwanan nan da kuma a cikin ƙasashen Hudson Bay, a cikin koma baya na ciyawa kafin iyakar gandun daji mai ci gaba a cikin Great Plains, da kuma a canzawa na itatuwan gandun daji da nau'ikan shuke-shuke (wanda aka gano ta hanyar palynology).

A Gabashin Asiya, farkon neoglaciation ya yi daidai da babban rauni na Gabashin Asiya Summer Monsoon (EASM).

Dubi kuma

• Ba da Kyakkyawan
• Holocene
• Subboreal