Layin dusar ƙanƙara

Layin dusar ƙanƙara
Bayanai
Ƙaramin ɓangare na	boundary (en)
Fuskar	snow (en)

Layin dusar ƙanƙara
Bayanai
Ƙaramin ɓangare na	boundary (en)
Fuskar	snow (en)

layin dusar ƙanƙara na yanayi shine iyaka tsakanin dusar ƙara da kuma dusar ƙana. Ainihin layin dusar ƙanƙara na iya daidaitawa a yanayi, kuma ya kasance mafi girma a tsawo, ko ƙasa. Layin dusar ƙanƙara na dindindin shine matakin da dusar ƙara za ta kasance a duk shekara.

Tarihi

Layin dusar ƙanƙara kalma ce don fassarori daban-daban na iyakar tsakanin dusar ƙara da kuma dusar ƙana. Ma'anar layin dusar ƙanƙara na iya samun maida hankali daban-daban na lokaci da sararin samaniya. A yankuna da yawa canjin layin dusar ƙanƙara yana nuna yanayi yanayi. Tsawon karshe na layin dusar ƙanƙara a cikin yanayin dutse a ƙarshen lokacin narkewa yana ƙarƙashin canjin yanayi, sabili da haka yana iya bambanta daga shekara zuwa shekara. Ana auna layin dusar ƙanƙara ta amfani da kyamarori na atomatik, hotuna na sama, ko Hotunan tauraron dan adam. Saboda ana iya kafa layin dusar ƙanƙara ba tare da ma'auni a ƙasa ba, ana iya auna shi a wurare masu nisa da wahalar samun dama. Sabili da haka, layin dusar ƙanƙara ya zama muhimmiyar canji a cikin samfuran ruwa.

Matsakaicin tsawo na layin dusar ƙanƙara mai wucewa ana kiransa "layin dusar ƙara na yanayi" kuma ana amfani dashi azaman siginar don rarraba yankuna bisa ga yanayin yanayi. Yankin tsakanin yankin tarawa da yankin ablation a kan kan kankara ana kiransa "layin dusar ƙanƙara na shekara-shekara". Yankin kankara da ke ƙasa da wannan layin dusar ƙanƙara ya narke a kakar da ta gabata. Ana amfani da kalmar "layin dusar ƙanƙara" don bayyana iyakar dusar ƙara a kan farfajiya ban da kankara. Ana amfani da kalmar "layin dusar ƙanƙara na yanki" don bayyana manyan yankuna. "Layin dusar ƙanƙara na dindindin" shine matakin da ke sama wanda dusar ƙara za ta kasance duk shekara.

Layin dusar ƙanƙara na yankuna na duniya

Haɗin kai na haɓakawa da latitude yana shafar daidaitaccen jeri na layin dusar ƙanƙara a wani wuri na musamman. A ko kusa da equator, yawanci yana a kusan 4,500 metres (14,764 ft) sama da matakin teku . Yayin da mutum ke motsawa zuwa Tropic of Cancer da Tropic of Capricorn, siga a farkon yana ƙaruwa: a cikin Himalayas layin dusar ƙanƙara na dindindin zai iya kaiwa 5,700 metres (18,701 ft) . Bayan Tropics, layin dusar ƙanƙara yana ƙara ƙasa kaɗan yayin da latitude ya ƙaru, zuwa ƙasa da 3,000 metres (9,843 ft) a cikin Alps kuma yana fadowa har zuwa matakin teku a kan kankara kusa da sanduna .

Wannan 1848 "Sketch nuna ainihin tsawo na Snow Line a cikin Latitudes daban-daban" na Alexander Keith Johnston yana nuna layin dusar ƙanƙara na duwatsu a Amurka, Turai da Asiya

Bugu da ƙari, wurin da ke kusa da bakin teku mafi kusa zai iya rinjayar hawan layin dusar ƙanƙara. Wuraren da ke kusa da bakin teku na iya samun ƙarancin layin dusar ƙanƙara fiye da wuraren da ke da tsayi iri ɗaya da latitude da ke cikin ƙasa mai cike da ƙasa saboda ƙarin dusar ƙanƙara ta hunturu kuma saboda matsakaicin zafin rani na wuraren da ke kewaye zai yi zafi daga teku. (Wannan ya shafi ko da a cikin wurare masu zafi, tun da wurare masu nisa daga teku za su sami manyan jeri na zafin rana da kuma yuwuwar ƙarancin danshi, kamar yadda aka lura da Kilimanjaro da Dutsen Meru wanda ba shi da glacier a halin yanzu.) Saboda haka tsayin daka ya zama dole don rage yawan zafin jiki gaba da kewaye kuma kiyaye dusar ƙanƙara daga narkewa.