Ucwaningo Lokusebenzisana Kwesimo Sezulu Esibi Kakhulu Nokuguguleka Kolwandle
Isimo sezulu esibi kakhulu siya ngokuya sidonsela ukunaka ngenxa yemiphumela yaso ebanzi kubantu, ezindaweni zemvelo, kanye nakwezomnotho. Izikhukhula ezisheshayo, izehlakalo zemvula enkulu kakhulu, amagagasi okushisa, imimoya enamandla, ngisho neziphepho zasezindaweni ezishisayo kuyizibonelo zezehlakalo ezingase zenzeke lapho uhlelo lomoya lungazinzile. Isihluthulelo esisodwa sokuqonda ukuthi kungani lezi zehlakalo zenzeka ukuhlola ubudlelwano obuguquguqukayo phakathi komkhathi nolwandle. Ulwandle aluyona nje "isizinda" esingenzi lutho, kodwa luwumhlinzeki omkhulu wamandla nomhwamuko wamanzi ongaqinisa noma ubuthakathaka izinhlelo zesimo sezulu. Lesi sihloko sihlola ukuthi ukusebenzisana komkhathi nolwandle kudlala kanjani indima ekwakhiweni kwesimo sezulu esibi kakhulu, izindlela zazo zomzimba, kanye nemiphumela yokuqapha nokunciphisa.
Ulwandle njengomhlinzeki wesitolo samandla kanye nomhwamuko wamanzi
Cishe u-70% wobuso boMhlaba umbozwe ulwandle, okuzivumela ukuthi zigcine futhi zisakaze ukushisa ngezinga elikhulu. Lapho ukukhanya kwelanga kushisa ubuso bolwandle, lawo mandla agcinwa njengokushisa engxenyeni engenhla (ungqimba oluxubile). La mandla angabe "edluliselwa" emkhathini ngezindlela ezimbili eziyinhloko: ukuguquguquka kokushisa okunengqondo (umehluko wokushisa phakathi kobuso bolwandle nomoya ongaphezu kwalo) kanye nokuguquguquka kokushisa okucashile (ukuhwamuka kwamanzi olwandle okuthwala umhwamuko wamanzi uye emkhathini). Lapho izimo zivuma, umhwamuko wamanzi omningi uyakhuphuka, ujiye, futhi ukhiphe ukushisa okucashile emafwini ajikelezayo—okukhuthaza ukukhula kwamafu esiphepho kanye nemvula enkulu.
Yingakho izindawo ezisogwini, amanzi ashisayo ashisayo, kanye nezindawo ezinezimvula zivame ukuba yizindawo ezibangela isimo sezulu esibi kakhulu. Uma izinga lokushisa lolwandle (i-SST) lishisa, kulapho amathuba okuhwamuka khona abe maningi futhi kulapho "uphethiloli" omkhulu wokwakheka kwamafu esiphepho. Kodwa-ke, ukufudumala kukodwa akwanele; umkhathi kumele usekele ukuphakama nokungazinzi okwanele ukuze la mandla aguqulwe abe yiziphepho.
Ukungazinzi komoya kanye nendima yokuguqulwa kwe-convection
Isimo sezulu esibi kakhulu sihlobene kakhulu nokuguquguquka kwesimo sezulu, ukunyakaza okukhuphukayo komoya ofudumele nomanzi. Lapho umoya oseduze nobuso uba shushu futhi unomswakama kakhulu kunomoya ongaphezu kwawo, uvame ukukhuphuka. Njengoba ukhuphuka, ukucindezela kwehla, umoya uyaphola, bese umhwamuko wamanzi uhlangana ukuze wakhe amafu. Lokhu kuqina kukhipha ukushisa okucashile, okwenza umoya ongaphakathi kwamafu ufudumale kunezindawo ezikuzungezile, okubangela ukuba ukhuphuke ngokushesha okukhulu. Le ndlela yokuphendula ingakhiqiza amafu e-cumulonimbus, iziphepho, imvula enamandla, ngisho nezinhlelo ezinkulu njengezinhlelo ze-mesoscale convective (MCS).
Ukusebenzisana komoya-mpilo nolwandle kuthonya ukujikeleza kwamanzi ngezici eziningana: ukutholakala komhwamuko wamanzi ovela ebusweni bolwandle, izinguquko ekushiseni komkhathi ophansi, kanye nokwehluka kwemimoya engaphezulu elawula ukuhlangana (ukuhlangana kwezixuku zomoya) esifundeni. Ezindaweni ezishisayo, ukuhlangana komoya eduze kobuso ngokuvamile kuyimbangela eyinhloko yokwakheka kwamafu emvula enamandla.
Izehlakalo ezinkulu: i-ENSO, i-IOD, kanye ne-MJO
Ezimweni eziningi, isimo sezulu esibi kakhulu asibangelwa nje yizici zendawo, kodwa futhi nokushintshashintsha okukhulu kwesimo sezulu okushintsha amazinga okushisa olwandle kanye namaphethini omoya.
1. ENSO (El Niño–Southern Oscillation)
I-El Niño ne-La Niña zishintsha ukusatshalaliswa kokushisa e-Pacific Ocean. E-Indonesia, i-El Niño ivame ukuhlotshaniswa nokwehla kwemvula kanye nengozi eyengeziwe yesomiso kanye nemililo yamahlathi, kuyilapho i-La Niña ivame ukwandisa imvula kanye nengozi yezikhukhula. Kodwa-ke, imiphumela yazo ingahluka phakathi kwezifunda nezinkathi ngenxa yokusebenzisana nezimvula ezinkulu kanye nezimo zendawo.
2. IOD (i-Indian Ocean Dipole)
I-IOD ichaza umehluko ekungajwayelekile kwezinga lokushisa lolwandle phakathi koLwandlekazi i-Indian olusentshonalanga nolwasempumalanga. Isigaba se-IOD esihle ngokuvamile senza amanzi azungeze intshonalanga ye-Indonesia apholile futhi avimbele ukwakheka kwamafu emvula, kuyilapho isigaba se-IOD esingesihle singandisa amathuba emvula enkulu kwezinye izindawo ngenxa yamanzi afudumele asempumalanga ye-Indian Ocean kanye nokwanda kokuhwamuka kwamanzi.
3. MJO (Madden–Julian Oscillation)
I-MJO igagasi lokuguquguquka kwesimo sezulu elihamba lisuka entshonalanga liye empumalanga ezindaweni ezishisayo ngesikali sezinsuku ezingama-30-60. Lapho isigaba se-MJO esisebenzayo sidlula esifundeni sase-Indonesia sasolwandle, ukuguquguquka kwesimo sezulu kanye nemvula kunganda kakhulu. I-MJO ivame ukusebenza njenge-"trigger" eqinisa izinhlelo zemvula, ikakhulukazi uma ihlanganiswa nezimo ze-SST ezifudumele kanye nomswakama ophezulu womoya.
Ukuhlanganiswa kwezigaba ze-ENSO, IOD, kanye ne-MJO kungadala izimo ezivumela kakhulu isimo sezulu esibi kakhulu. Isibonelo, i-La Niña, ekhulisa umswakama wangemuva, ihlanganiswe ne-MJO esebenzayo, ingaholela emvuleni enkulu kakhulu kanye nezikhukhula ezindaweni ezahlukene.
Ukwakheka kweziphepho zasezindaweni ezishisayo: izidingo zamandla ezivela olwandle
Iziphepho zasezindaweni ezishisayo (kufaka phakathi iziphepho zasezindaweni ezishisayo) ziyizibonelo ezimangalisayo zezinhlelo ezithembele kakhulu olwandle. Iziphepho zasezindaweni ezishisayo ngokuvamile zidinga ama-SST afudumele (ngokuvamile abizwa ngokuthi umkhawulo ongaba ngu-26–27°C), umswakama ophezulu, ukuphazamiseka kokuqala (njengegagasi lasezindaweni ezishisayo), kanye nokushefa komoya okuqondile okumaphakathi. Izilwandle ezifudumele zinikeza amandla ngokuhwamuka kanye nokukhishwa kokushisa okucashile enkabeni yesiphepho. Lapho amandla etholakala kakhulu futhi ukujikeleza kwegazi kusebenza kahle, kulapho isiphepho singaqina khona sibe uhlelo olunamandla kakhulu.
Kodwa-ke, ulwandle lungabuthakathaza neziphepho ngokusebenzisa indlela “yokuzipholisa”. Imimoya enamandla esiphephweni iyashukumisa ulwandle, idonse amanzi abandayo kusuka phansi iye phezulu (enyuka), yehlise ama-SST endawo futhi inciphise ukuhlinzekwa kwamandla. Ukujula kwengqimba efudumele kuyisici esibalulekile: uma ungqimba olufudumele lujiyile, isiphepho cishe asikwazi “ukusha” futhi sivame ukuqhubeka sinamandla.
Imisinga yolwandle, ukuphakama, kanye nemingcele yokushisa
Ukusebenzisana komkhathi nolwandle akuxhomekile kuphela ekushiseni okumaphakathi kobuso, kodwa futhi nasekwakhekeni kolwandle kanye nokuguquguquka okufana nemisinga, amazinga okushisa, kanye nokuphakama.
– Ukuphakama kuletha amanzi abandayo, acebile ngezakhamzimba phezulu. Ngokwesimo sezulu, amanzi apholile angazinzisa umoya ophansi, anciphise ukujikeleza kwamanzi, futhi acindezele imvula. Kodwa-ke, umngcele phakathi kwamanzi afudumele nabandayo (ingaphambili) ungadala i-gradient yokushisa ethinta amaphethini omoya wendawo kanye nokuhlangana kwawo, okungaphansi kwezimo ezithile empeleni kungasiza ekuqaliseni izinhlelo zesimo sezulu.
– Imisinga yolwandle ihambisa ukushisa phakathi kwezifunda. Izinguquko kule misinga zingashintsha isikhungo se-SST efudumele, zishintshe indawo “yezimboni” zamafu emvula, futhi ekugcineni zithonye indlela kanye nobukhulu bezehlakalo zesimo sezulu esibi kakhulu sesizini.
Esifundeni esinama-archipelago njenge-Indonesia, ukwehluka kwemisinga kanye namazinga okushisa olwandle emanzini amancane (imigqa, ulwandle olungajulile) kungashintsha ngokushesha okukhulu, okwenza izinselele zokubikezela zibe zinkulu nakakhulu.
Umthelela wokushintsha kwesimo sezulu: ukuqinisa umjikelezo wamanzi
Ukufudumala komhlaba kwandisa amandla omoya okugcina umhwamuko wamanzi (okuhlobene ngokomzimba nobudlelwano bukaClausius noClapeyron). Lokhu kusho ukuthi lapho kuvela imvula, inamandla okuba namandla kakhulu ngenxa "yomthwalo" omkhulu womhwamuko wamanzi emkhathini. Izilwandle ezifudumele nazo zisho ukwanda kokuhwamuka kanye namandla engeziwe atholakalayo okuhambisa umoya.
Uma kukhulunywa ngesimo sezulu esibi kakhulu, lokhu akusho ukuthi imvula ivame kakhulu yonke indawo, kodwa ukuqina kwayo kuvame ukwanda lapho kunezimo ezibangela lokhu. Ngaphezu kwalokho, ukunyuka kwezinga lolwandle kwandisa imiphumela yeziphepho zasogwini ngezikhukhula zamanzi kanye nokwanda kweziphepho, okwandisa ingozi yezehlakalo eziyinkimbinkimbi.
Ukuqaphela kanye nokulingisa: indlela yokufunda ukusebenzisana komkhathi nolwandle
Ukuze baqonde futhi babikezele isimo sezulu esibi kakhulu, ososayensi basebenzisa inhlanganisela yokubuka kanye nokulingisa:
1. Amasathelayithi aqapha i-SST, amafu, imvula, umhwamuko wamanzi, kanye nemimoya yolwandle.
2. Ama-Buoys nama-Argo floats alinganisa izinga lokushisa kanye nosawoti wephrofayili yolwandle, okusiza ekunqumeni ukujula kwengqimba efudumele kanye nenqubo yokuxuba.
3. I-radar yesimo sezulu ithola izakhiwo zemvula neziphepho ezinemininingwane ezindaweni zomhlaba nezisogwini.
4. Amamodeli ahambisanayo omoya-olwandle alingisa impendulo ezinhlangothi zombili: umoya uthonya ulwandle ngomoya kanye nokushintsha kokushisa, kuyilapho ulwandle luthonya umoya nge-SST kanye nokuhwamuka. Amamodeli ahambisanayo ngokuvamile angcono ekubikezeleni ukuvela kwezinhlelo zesimo sezulu ezizwela izinguquko ze-SST zansuku zonke.
Izinselele eziyinhloko ukuxazululwa kwendawo kanye nekhwalithi yedatha yokuqala. Izehlakalo ezimbi kakhulu zivame ukukhula ngokushesha futhi zithonywa izinqubo ezincane ezifana namafu ajikelezayo, ukuma kwendawo ogwini, kanye nokuguquguquka kwe-SST kwansuku zonke. Ngakho-ke, ukuthuthukisa amanethiwekhi okubuka kanye nokubalwa kwamamodeli kubalulekile.
Imiphumela yokunciphisa ubungozi
Ukuqonda ukusebenzisana komkhathi nolwandle kusiza ekuthuthukiseni izibikezelo zakuqala zesimo sezulu esibi kakhulu, kusekela izixwayiso zezikhukhula, ukuhlela indawo yogu lolwandle, kanye nokuphathwa kwemithombo yamanzi. Ulwazi mayelana nokungahambi kahle kwe-SST, imisebenzi ye-MJO, kanye nezimo zemvula zingasetshenziswa njengezinkomba zokwanda kwengozi yemvula enkulu noma isomiso njalo ngeviki kuya esikalini sonyaka. Ezindaweni ezisogwini, ukuhlanganisa izibikezelo zamagagasi, amagagasi, kanye nemvula nakho kubalulekile ukulindela izikhukhula zasogwini ezingase zenzeke ngenxa yokuhlanganiswa kwezici zesimo sezulu kanye nezolwandle.
I-Penutup
Isimo sezulu esibi kakhulu asiveli ngengozi; sibangelwa ukusebenzisana okuyinkimbinkimbi phakathi komkhathi nolwandle, kusukela esikalini sendawo kuya emhlabeni wonke. Ulwandle lunikeza ukushisa nomhwamuko wamanzi, umkhathi ulawula ukungazinzi nokujikeleza kwegazi, kuyilapho izenzakalo ezifana ne-ENSO, i-IOD, kanye ne-MJO zilawula amathuba emvula enkulu, iziphepho, noma isomiso. Ngokuqiniswa komjikelezo wamanzi ngenxa yokushintsha kwesimo sezulu, ucwaningo lokuxhumana komkhathi nolwandle luya ngokuya luba lubaluleke kakhulu. Ukutshalwa kwezimali ekubonweni, amamodeli ahlanganisiwe, kanye nezinhlelo zokuxwayisa kusenesikhathi kuzosiza umphakathi ukulungiselela kangcono izingozi eziguqukayo zesikhathi esizayo.
