Yanayin yanayi na yau da kullun

Yanayin yanayi na al'ada ko yanayi na al-ada (CN) matsakaicin shekaru 30 ne na canjin yanayi na wani lokaci na shekara. Mafi yawanci, CN yana nufin wani watan shekara, amma kuma yana iya nufin sikelin da ya fi girma, kamar takamaiman Lokacin yanayi. Kwanan nan, an ba da rahoton CN don ƙananan ma'auni, kamar ranar shekara har ma da ma'aunin sa'a.

Ana amfani da al'amuran yanayi a matsayin matsakaici ko tushe don kimanta abubuwan da suka faru na yanayi da samar da mahallin don canjin shekara-shekara. Za'a iya lissafin al'ada don sauye-sauyen yanayi daban-daban ciki har da zafin jiki da hazo kuma ya dogara da bayanai daga Tashoshin yanayi. Canji daga matsakaicin shekaru 30 yana da kyau kuma Canjin yanayi yana kallon girman matsananci. Matsayin yanayi na yau da kullun sune lokutan da aka sabunta a kowace shekara goma: 1971-2000, 1981-2010, 1991-2020, da dai sauransu.

Kalmar "al'ada" ta fara bayyana a cikin wallafe-wallafen da Heinrich Wilhelm Dove ya yi a cikin 1840 kuma kwamitin kula da yanayi na kasa da kasa ya tsara manufar a cikin 1872. [1] Amfani da tsawon shekaru 30 na al'ada ya fara ne a 1935 tare da lokacin 1901-30. [2] Ci gaba da amfani da al'amuran shekaru 30 an ƙara yin tambaya saboda shaidar da ta dace cewa ba za a iya ɗaukar ƙididdigar ƙididdigarsa ba saboda Canjin yanayi.[1][3] Wannan ya haifar da madadin ma'anoni kamar "Mafi kyawun Yanayi na Yanayi" da kuma tsarin "Hinge Fit" don kara daidaitattun shekaru 30 waɗanda har yanzu ana amfani da su.[4]

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