Duniyar Planet duniya ce mai rai, ta yadda idan yanayin zafi ya tashi a wani wuri, sai su fada wani domin kiyaye daidaituwar yanayin yanayin duniya. Wani abu makamancin haka zai faru da Bahar Rum da Sahel: a cikin shekaru 20 da suka gabata, yankin Bahar Rum yana fuskantar karuwar yanayin zafi da raguwar ruwan sama, ruwan sama kamar da alama ya koma yankin Sahel, kamar yadda aka bayyana a cikin binciken da aka buga a mujallar Canjin Yanayi, wanda Max Planck Institute for Meteorology ya shirya.
Saboda karuwar yanayin zafi a cikin Mare Nostrum, danshi da ya kai iyakar kudu da Sahara a farkon damina ta Yammacin Afirka a watan Yuni ma ya fi haka, don haka yankin Sahel ya zama kore.
Yanayin Yankin Sahel yana da matukar sauyawa, wanda ya mamaye yankin Afirka ta Yamma, wanda ke kawo ruwan sama daga Yuni zuwa Satumba. Sauran shekara, fari yana da tsananin gaske. Duniya tayi zafi sama da teku a lokacin bazara, tunda rana tana sama da wuri kuma, bugu da kari, tekun ba sa daukar zafi da sauri kamar ƙasa. Iskar tana tashi daga babban yankin kuma, yin hakan, yana samar da danshi mai gudana daga teku zuwa Sahel.
Intensarfin ruwan sama yana ta canzawa a kan lokaci. Tsakanin 1950 da 1960, yankin Sahel ya sami lokacin danshi; A shekarun 1980, fari ya yi kamari wanda ya sa mutane sama da 100.000 suka rasa rayukansu. Tun daga wannan lokacin, ruwan sama ya dawo.
Dalilin a cewar masana kimiyya shine Dumamar Bahar Rum. Don isa ga wannan ƙarshe, an yi nazarin al'amuran daban-daban ta amfani da misalai daban-daban. Don haka, sun sami damar gano cewa idan yawan zafin jiki a yankin Bahar Rum ya kasance koyaushe ko ƙasa da ƙasa, hazo a Sahel ba ya ƙaruwa; akasin haka, idan Tekun Bahar Rum ya dumi, a cikin Sahel ana ruwan sama sosai.
Wannan saboda saboda ba zafin jiki kawai ke tashi ba, har ma da danshi, wanda shine "ke kunna" yanayin damina na Afirka ta Yamma. Ta wannan hanyar, a wannan yanki na Afirka, zasu iya jin daɗin ƙarin ruwan sama a farkon lokacin damina.
Kuna iya karanta karatun a nan (cikin Turanci).