Cika wannan magana: Canjin PMM ba shi da daidaito. Dukkanin yanayin yanayi na yanayi - musamman ƙarfin yanayin zafi na teku wanda ke haifar da canjin iska da kuma latitude na ITCZ - da kuma hadari a cikin extratropics suna tasiri da canjin sa. ITCZ yana iyakance girman PMM zuwa kudu, kuma canjin canji a cikin matsakaicin matsayin ITCZ saboda canje-canje na yanayi na iya yin tasiri ga bayyanar PMM. Simulations na Sanchez "et al. " (2019) sun sami karuwar PMM mai canzawa duka a cikin martani ga fashewar dutsen mai aman wuta, kamar
1257 Samalas fashewa da kuma a mayar da martani ga greenhouse gas. Rage aikin PMM a tsakiyar Holocene na iya bayyana raunin canjin ENSO a wannan lokacin; irin wannan raguwa na iya haifar da tilastawar kewaye. Bramante "et al. " (2020) ya sami canjin PMM mai kyau a lokacin Rashin Tsarin Yanayi na Tsakiyar Tsakiya da PMM mara kyau a lokacin Little Ice Age kuma ya yi amfani da shi don bayyana canje-canje a cikin ayyukan guguwa a Jaluit a Tsibirin Marshall da kuma a Tekun Kudancin China.