<prompt> Pedzisa mutsara unotevera: PMM variability is not constant. Zvose zviri zviviri mamiriro ekunze epakati - kunyanya kusimba kwekushanduka kwekupisa kwepasi pegungwa kunokonzerwa nekuchinja kwemhepo uye latitude yeITCZ - uye dutu riri muextratropics rinokanganisa kushanduka kwayo. ITCZ inoganhurira kusvika kwePMM kumaodzanyemba, uye kuchinjika kwenzvimbo yepakati yeITCZ nekuda kwekuchinja kwemamiriro ekunze kunogona kukanganisa kuratidzwa kwePMM. Kuenzanisa kwakaitwa naSanchez et al. 2019 kwakawana kuwedzerwa kwePMM kusiyanisa zvese mukupindura kuputika kwemakomo, senge  <response>: 1257 Samalas kuputika uye mukupindura kumagasi anokonzera kupisa. Kuderera kwebasa rePMM mukati meHolocene yepakati kunogona kutsanangura kushomeka kweENSO panguva iyoyo; kuderera kwakadaro kungave kwakakonzerwa nekumanikidza kwedenderedzwa. Bramante et al. 2020 vakawana musiyano wakanaka wePMM panguva yeMedieval Climate Anomaly uye isina kunaka PMM panguva yeLittle Ice Age uye vakaishandisa kutsanangura shanduko mu typhoon chiitiko paJaluit muMarshall Islands uye muSouth China Sea. 