Yammacin Bahar Rum

Yammacin Bahar Rum oscillation (WeMO ko WeMOi) alama ce da ke auna bambancin tsakanin daidaitaccen Matsin yanayi da aka rubuta a Padua (45.40◦N, 11.48◦E) a arewacin Italiya, da San Fernando, Cádiz (36.28◦N, 6.12◦W) a Kudu maso Yammacin Spain. Ganin cewa Padua yanki ne tare da bambancin barometric mai yawa saboda tasirin tsakiya na Turai, San Fernando sau da yawa yana ƙarƙashin tasirin Azores High.

An gabatar da wannan alamar a matsayin Haɗin kai ta hanyar bincike a cikin Climatology Group a Jami'ar Barcelona [1] yana ba da madadin ga sanannen NAO don nazarin bambancin ruwan sama a gabashin Spain, a yankuna kamar Catalonia, Valencia, da Murcia.

Wasu masana kimiyyar yanayi sun yi imanin cewa tsarin barometric na WeMOi yana da alaƙa da, kuma ta haka ne wani ɓangare na tsinkaya na, bambancin ruwan sama a gefen gabashin Yankin Iberian . Wani lokaci mai kyau na WeMOi yawanci yana nuna anticyclone a yankin Gulf of Cádiz da kuma yankin da ke da matsin lamba a Tekun Liguria yayin da wani lokaci na WeMOe mara kyau zai nuna Low a cikin Gulf of Cá Cádiz da anticyclon a Tsakiyar Turai. A lokacin Positive phase, iskõki masu yawa a cikin Iberian Peninsula yawanci Yamma da Arewa maso Yamma, sun samo asali ne daga yankin Arewacin Atlantic; waɗannan iskõki, a lokacin da suka isa gefen Gabashin Peninsula, sun yi tafiya a kan yankunan nahiyar, don haka sun zama bushe da dumi (iska na yamma) ko sanyi amma daidai ya bushe (arewa maso yamma). Sabanin haka, wani lokaci na WeMOi mara kyau yana da alaƙa da iskar iska mai laushi wanda ya yi tafiya a kan Bahar Rum; saboda haka waɗannan suna cike da danshi lokacin da suka isa gefen gabashin yankin Iberian, wanda ke haifar da karuwar -wani lokacin ruwan sama a wannan yanki.