Yanayin yanayin duniya

A kimiyyar duniya, yanayin wuraren duniya (GST; wani lokacin ana kiransa yanayin zafin duniya na ma'ana, GMST, ko matsakaicin yanayin wuraren duniya ) ana ƙididdige su ta hanyar kididdige yanayin zafi ko sanyi na saman teku da kuma zafi ko sanyin iska akan ƙasa. Lokutan sanyayar yanayi da dumamar yanayi sun canza a tarihin duniya.

Jerin ingantattun ma'aunin zafin duniya ya fara a cikin shekarar 1850-1880 lokaci. Ta hanyar 1940, matsakaicin zafin jiki na shekara-shekara ya karu, amma ya kasance mai inganci tsakanin 1940 zuwa 1975. Tun daga 1975, ya karu da kusan 0.15 °C zuwa 0.20 °C a kowace shekara goma, zuwa akalla 1.1 °C (1.9 °F) sama da matakan 1880.

Matakan teku sun tashi da faɗuwa sosai a cikin tarihin shekaru biliyan 4.6 na duniya. Duk da haka, hawan matakin tekun duniya na baya-bayan nan, sakamakon ƙaruwar yanayin yanayin duniya, ya karu fiye da matsakaicin adadin shekaru dubu biyu zuwa uku da suka gabata. Ci gaba ko haɓaka wannan yanayin zai haifar da gagarumin canje-canje a gabar tekun duniya.