Isihloko mayelana nokudluliselwa kokushisa nge-convection
Wake wake waya ngasogwini lolwandle lapho ilanga libalele? Ngosuku olucacile, ogwini lolwandle, kuhlale kunomoya ovunguzayo ovela olwandle. Kungani kuhlale kunomoya ogwini lolwandle, futhi kungani umoya wolwandle (imimoya evunguzayo esuka olwandle iya ezweni) uvela emini, umoya womhlaba (imimoya evunguzayo esuka ezweni iya olwandle) uvela ebusuku? Kungani ngesikhathi semvula amafu ehla aye emithambekeni? Kungani umoya uzizwa upholile? Izimpendulo zale mibuzo zihlobene nokushisa okuthile komhlaba nolwandle, ukwanda, ubuningi, kanye nokudluliselwa kokushisa nge-convection!
Ngokuqonda kahle nangokufanele isihloko, ungaphendula imibuzo engenhla kanye neminye imibuzo ongase uyibuze kamuva.
Ukudluliselwa kokushisa ngokuqhutshwa komoya kuvame ukwenzeka ezintweni eziqinile noma kusukela ezintweni eziqinile kuya ezintweni eziwuketshezi (futhi kusukela ezintweni eziwuketshezi kuya ezintweni eziqinile) noma kusukela ezintweni eziqinile kuya ezintweni zegesi (futhi kusukela ezintweni zegesi kuya ezintweni eziqinile). Ngenkathi ukudluliselwa kokushisa ngokuqhutshwa komoya kuvame ukwenzeka ezintweni eziwuketshezi (isb. amanzi) kanye nezinto zegesi (isb. umoya). Ukudluliselwa kokushisa ngokuqhutshwa komoya kuwukudluliselwa kokushisa okuhambisana nokudluliselwa kwezinto. Ukuze uqonde kangcono ukudluliselwa kokushisa ngokuqhutshwa komoya, buyekeza icala, isibonelo, amanzi afudumele kusetshenziswa umlilo. Lapho amanzi esitsheni eshiswa ngomlilo, ukushisa kusuka emlilweni (izinga lokushisa eliphezulu) kuya esitsheni (izinga lokushisa eliphansi) ngokuqhutshwa komoya kanye nemisebe. Bese, ukushisa kusuka esitsheni (izinga lokushisa eliphakeme) kuya emanzini eduze kwesitsha (izinga lokushisa eliphansi) ngokuqhutshwa komoya. Ukushisa okwengeziwe kubangela ukuthi izinga lokushisa lamanzi eduze kwesitsha likhuphuke.
Ukwanda kwezinga lokushisa kwamanzi kubangela ukuthi amanzi ande noma umthamo wamanzi ukhuphuke. Ngoba njengoba umthamo wamanzi ukhuphuka, ubuningi bamanzi buyancipha. Amanzi aseduze kwesisekelo sesitsha anokushisa okuphezulu kunamanzi aseduze naso. Ngamanye amazwi, amanzi aseduze kwesisekelo sesitsha anomthamo omkhulu nobuningi obuncane, kuyilapho amanzi angaphezulu kwawo enomthamo ophansi nobuningi obuphezulu. Umehluko wobuningi ubangela ukuthi amanzi ebusweni besitsha, esinobuningi obukhulu, ahambe phansi bese amanzi aseduze kwesisekelo sesitsha, esinobuningi obuncane, ahambe phezulu. Le nqubo yenzeka njalo kuze kube yilapho wonke amanzi angaphakathi enokushisa okufanayo (Uma umfutho womoya ungumoya owodwa, khona-ke amanzi esitsheni ayahwamuka noma abilayo ku-100 o C).
Ukwenzeka kwemimoya yasemhlabeni kanye nemimoya yasolwandle kuhilela nokudluliselwa kokushisa ngokuqhutshwa komoya kanye nokuguqulwa komoya. Ukushisa okuqondile komhlabathi kuncane kunokushisa okuqondile kwamanzi olwandle. Ngakho-ke, umhlabathi ushisa ngokushesha uma uvezwa elangeni futhi ubanda kakhulu lapho kufika ubusuku. Ukushisa komhlabathi kushisa umoya ongaphezulu ngokushesha (ukushisa kusuka ezweni kuya emoyeni ngokuqhutshwa komoya). Izinga lokushisa lomoya liyakhuphuka futhi umoya uyakhula. Ngenxa yalokho, ubuningi bomoya buyancipha. Ngokuphambene nalokho, izinga lokushisa lamanzi olwandle libanda kakhulu kangangokuthi umoya ongaphezu kwezinga lolwandle nawo ubanda kunomoya osemhlabeni.
Umoya ongaphezulu kolwandle upholile ukuze ubuningi bube phezulu. Umehluko wobuningi bomoya ubangela ukuthi umoya ongaphezulu kolwandle uye ezweni, kuyilapho umoya ophansi ukhuphukela phezulu. Uma uqhelelene nobuso bomhlaba, inani lomoya liyancipha ngoba amandla adonsela phansi omhlaba ayancipha. Ngenxa yokuthi inani lomoya liyancipha, umfutho womoya nawo uyancipha.
Umoya oshisayo ezweni okhuphukela phezulu usupholile ngoba ukude kakhulu nomhlaba, umfutho womoya uyancipha. Umoya obandayo ube usuya phansi, hhayi ebusweni bomhlaba kodwa ebusweni bolwandle, olunezinga lokushisa elibandayo kakhulu. Le nqubo yenzeka njalo ukuze kube nokugeleza komoya osuka olwandle uye ezweni. Ngamafuphi, umoya oseduze nolwandle uya phansi, umoya oseduze nobuso bomhlaba uya phezulu, umoya ongaphezulu uya phezulu olwandle.
Kungani intuthu ikhuphuka njalo? Intuthu ikhuphuka ngoba izinga lokushisa liphakeme kunezinga lokushisa lomoya ozungezile. Ngenxa yokuthi izinga lokushisa lentuthu liphakeme, ivolumu iyanda futhi ubuningi buyancipha. Isisindo esincane sentuthu sibangela ingcindezi encane, uma kuqhathaniswa nengcindezi yomoya ozungezile. Umoya ozungeze intuthu ucindezela intuthu phezulu.
Kungani ifu liyehla ngenkathi yemvula? Ngesikhathi semvula, amafu aqukethe umhwamuko wamanzi omningi ukuze ubuningi bamafu bukhuphuke. Amafu aqukethe umhwamuko wamanzi omningi futhi anobuningi obukhulu, ahamba phansi aye endaweni lapho umoya ozungeze indawo unobukhulu obufanayo nobukhulu bamafu. Ungabuza futhi uphendule izinto eziningi ezihlobene nale ndaba uma uqonde kahle futhi ngokunembile incazelo engenhla.
