{"id":1997,"date":"2024-01-10T10:12:23","date_gmt":"2024-01-10T10:12:23","guid":{"rendered":"https:\/\/troposferica.com\/?p=1997"},"modified":"2024-01-10T10:12:26","modified_gmt":"2024-01-10T10:12:26","slug":"el-dipol-orografic-i-la-inestabilitat-atmosferica","status":"publish","type":"post","link":"https:\/\/troposferica.com\/ca\/el-dipol-orografic-i-la-inestabilitat-atmosferica\/","title":{"rendered":"EL DIPOL OROGR\u00c0FIC I LA INESTABILITAT ATMOSF\u00c8RICA"},"content":{"rendered":"\n

Per poder entendre qu\u00e8 \u00e9s el fenomen del dipol orogr\u00e0fic<\/mark><\/strong> i les formacions de les mesobaixes<\/strong> <\/mark>cal entendre l\u2019atmosfera com un sistema fluid i turbulent. No us espanteu! A qu\u00e8 ens referim quan diem que l\u2019atmosfera \u00e9s un fluid turbulent? Volem dir que l\u2019atmosfera t\u00e9 diferents nivells de moviment, els quals estan estretament relacionats els uns amb els altres.<\/p>\n\n\n\n

Quins s\u00f3n aquests nivells de moviment? Aix\u00ed a grans trets, podem dir que tenim l\u2019escala planet\u00e0ria, la sin\u00f2ptica, la mesoescala i la microescala. Per a saber m\u00e9s dels nivells de moviment atmosf\u00e8ric, pots llegir l’anterior blog<\/a>.<\/p>\n\n\n\n

El Dipol Orogr\u00e0fic i les\u00a0mesobaixes\u00a0s\u00f3n fen\u00f2mens que corresponen a la\u00a0mesoescala. Explicarem de la forma m\u00e9s f\u00e0cil possible en qu\u00e8 consisteix aquest fenomen, com es forma i quines conseq\u00fc\u00e8ncies pot tenir.<\/p>\n\n\n\n

El Dipol Orogr\u00e0fic, com diu el seu nom, \u00e9s un fenomen que es genera a causa de l\u2019orografia del terreny. Quan una massa d\u2019aire es troba amb una serralada prou gran, com ara els Pirineus, es genera una difer\u00e8ncia de pressi\u00f3 entre ambd\u00f3s costats de la serralada.<\/p>\n\n\n\n

Amb un exemple s\u2019entendr\u00e0 millor:<\/p>\n\n\n\n

Imaginem-nos que tenim una situaci\u00f3 sin\u00f2ptica que genera un vent del nord que travessa Fran\u00e7a i va directe cap als Pirineus.<\/p>\n\n\n\n

Quan la massa d\u2019aire es troba amb la serralada no la pot travessar, sin\u00f3 que l\u2019ha d\u2019evitar, rodejar-la pels costats, per tant, es desvia del seu moviment original. A m\u00e9s, un cop l\u2019ha travessat, gran part d\u2019aquest vent acaba baixant per la vall de l\u2019Ebre, cosa que fa que les is\u00f2bares acabin fent com una forma de \u201cS\u201d.<\/p>\n\n\n\n

En la imatge 1 hi ha representades les is\u00f2bares i la traject\u00f2ria que faria el vent geostr\u00f2fic. (Podeu trobar que \u00e9s el vent geostr\u00f2fic en aquest blog<\/a>). Tamb\u00e9 cal remarcar que a sotavent de la serralada es produeix un empaquetament de les is\u00f2bares (estan m\u00e9s pr\u00f2ximes entre si), que es tradueix per una acceleraci\u00f3 del vent.<\/p>\n\n\n\n

\"\"
Imatge 1: Representaci\u00f3 de les is\u00f3bares en el Dipol Orogr\u00e0fic<\/figcaption><\/figure>\n\n\n\n

Aquest moviment del vent a escala sin\u00f2ptica genera un moviment secundari de les masses d\u2019aire a escala m\u00e9s petita, \u00e9s a dir a mesoescala. Perqu\u00e8 recordem que totes les escales estan relacionades entre si!<\/p>\n\n\n\n

Aquest moviment secundari generat \u00e9s una rotaci\u00f3 en sentit horari al nord dels Pirineus i una rotaci\u00f3 en sentit antihorari al sud. Aquests tipus de rotacions s\u00f3n molt caracteristics i altament coneguts per totes les persones que estan lleugerament interessades en la meteorologia.<\/p>\n\n\n\n

A l\u2019hemisferi nord, una rotaci\u00f3 hor\u00e0ria est\u00e0 lligada a les altes pressions, tamb\u00e9 conegut com anticicl\u00f3, i una rotaci\u00f3 antihor\u00e0ria est\u00e0 lligada a les baixes pressions, depressi\u00f3, borrasques o ciclons.<\/p>\n\n\n\n

\u00c9s a dir, a causa d\u2019aquest moviment a escala sin\u00f2ptica s\u2019ha generat un moviment secundari de masses d\u2019aire a mesoescala que ha produ\u00eft un petita zona d\u2019altres pressions al nord dels Pirineus i una de baixes pressions al sud dels Pirineus, que s\u00f3n conegudes com a mesoalta i mesobaixa (imatge 2).<\/p>\n\n\n\n

\"\"
Imatge 2: Representaci\u00f3 de la mesoalta i mesobaixa a sobrevent i sotavent dels Pirineus<\/figcaption><\/figure>\n\n\n\n

Les mesoaltes i les mesobaixes tenen les mateixes propietats que els anticiclons i les borrasques, per\u00f2 de mides redu\u00efdes.<\/p>\n\n\n\n

Per\u00f2, que \u00e9s exactament una zona d’altes pressions i una de baixes? A grans trets, es pot afirmar que una zona d’altes pressions o anticicl\u00f2nica \u00e9s una \u00e0rea on la columna de massa d’aire \u00e9s m\u00e9s gran, pesa m\u00e9s i, que a m\u00e9s, aquesta columna de massa d’aire est\u00e0 descendint. En conseq\u00fc\u00e8ncia, hi ha un augment de l’estabilitat en aquesta \u00e0rea. Al contrari, una zona de baixes pressions o depressi\u00f3 \u00e9s una \u00e0rea on hi ha columna d’aire m\u00e9s petita i, a m\u00e9s, hi ha un ascens de la massa d’aire que porta a un augment de la inestabilitat.<\/p>\n\n\n\n

Aquest fet fa que a Catalunya, quan bufa vent del nord, es pugui formar una mesobaixa que pot portar mal temps, per\u00f2 aix\u00f2 no \u00e9s tot…<\/p>\n\n\n\n

Com es pot observar a les imatge 2 i 3, a l\u2019Empord\u00e0 hi bufa la Tramuntana, el vent del nord, per\u00f2 en canvi, cap a les terres de l\u2019Ebre hi bufa el Mestral, el vent del nord-oest. Aquesta difer\u00e8ncia en la direcci\u00f3 del vent fa que els dos vents acabin coincidint en una \u00e0rea de converg\u00e8ncia.<\/p>\n\n\n\n

Aquesta \u00e0rea de converg\u00e8ncia normalment est\u00e0 situada a sobre o al voltant de les illes Balears, per\u00f2 com a conseq\u00fc\u00e8ncia de la formaci\u00f3 de la mesobaixa del sud dels Pirineus i la seva rotaci\u00f3 cicl\u00f2nica es genera, de nou, un moviment secundari de masses d\u2019aire.<\/p>\n\n\n\n

Aquest moviment secundari consisteix en una desviaci\u00f3 de part del vent que bufa al nord i sud de Catalunya seguint el moviment antihorari de la mesobaixa, com es pot observar en la seg\u00fcent imatge. \u00c9s per aquest motiu que, molt sovint, quan a l\u2019Empord\u00e0 est\u00e0 bufant la Tramuntana i a les terres de l\u2019Ebre el Mestral, a la costa central de Catalunya hi bufa vent de component sud o sud-oest. Aquest fenomen de canvi de direcci\u00f3 del vent es coneix col\u00b7loquialment com a \u201crebuf\u201d i \u00e9s \u00e0mpliament utilitzat pels aficionats al mar i a la meteorologia.<\/p>\n\n\n\n

\"\"
Imatge 3: Formaci\u00f3 de la l\u00ednia de\u00a0converg\u00e8ncia\u00a0dels vents<\/figcaption><\/figure>\n\n\n\n

Aquest \u201crebuf\u201d creat per la mesobaixa fa que l\u2019\u00e0rea de converg\u00e8ncia de vents no es limiti a les illes Balears, sin\u00f3 que es formi tota una l\u00ednia de converg\u00e8ncia des de la mesobaixa fins al punt on els vents tornen a fluir en la mateixa direcci\u00f3.<\/p>\n\n\n\n

Per\u00f2… per qu\u00e8 \u00e9s tan important aquesta \u00e0rea de converg\u00e8ncia de vents?<\/p>\n\n\n\n

A l\u2019atmosfera una converg\u00e8ncia de vents implica un ascens de les masses d\u2019aire que est\u00e0n convergint i, com ja hem dit anteriorment, un ascens implica una inestabilitzaci\u00f3 i, per tant, la possibilitat de tenir pluges i \u201cmal temps\u201d.<\/p>\n\n\n\n

Encara que sembli que ha de ser al contrari, l\u2019\u00e0rea de converg\u00e8ncia molt sovint portar\u00e0 pluges i tempestes molt m\u00e9s importants que la mesobaixa en si mateixa. Per\u00f2 per qu\u00e8 aix\u00f2? L\u2019\u00e0rea de converg\u00e8ncia ocorre, en gran part, sobre el mar i, per tant, les masses d\u2019aire que ascendeixen s\u00f3n m\u00e9s humides que les que hi ha sota de la mesobaixa, de tal manera que un ascens d\u2019una massa d\u2019aire m\u00e9s humida podr\u00e0 generar n\u00favols m\u00e9s grans i desenvolupats.<\/p>\n\n\n\n

Majorit\u00e0riament, les grans tempestes que descarreguen a l’\u00e0rea de la costa central Catalana o b\u00e9 davant de les seves costes estan lligades a aquest fenomen.<\/p>\n","protected":false},"excerpt":{"rendered":"

Per poder entendre qu\u00e8 \u00e9s el fenomen del dipol orogr\u00e0fic i les formacions de les mesobaixes cal entendre l\u2019atmosfera com un sistema fluid i turbulent. No us espanteu! A qu\u00e8 ens referim quan diem que l\u2019atmosfera \u00e9s un fluid turbulent? Volem dir que l\u2019atmosfera t\u00e9 diferents nivells de moviment, els quals estan estretament relacionats els […]\n","protected":false},"author":35,"featured_media":2006,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[75],"tags":[194,193,195,64],"class_list":["post-1997","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades-ca","tag-curiositats-meteorologiques","tag-dipol-orografic","tag-mal-temps-a-catalunya","tag-meteorologia-ca"],"acf":[],"yoast_head":"\nEL DIPOL OROGR\u00c0FIC I LA INESTABILITAT ATMOSF\u00c8RICA - Troposferica<\/title>\n<meta name=\"description\" content=\"El Dipol Orogr\u00e0fic i les\u00a0mesobaixes\u00a0s\u00f3n fen\u00f2mens de\u00a0mesoescala que poden comportar un augment de la inestabilitat atmosf\u00e8rica.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/troposferica.com\/ca\/el-dipol-orografic-i-la-inestabilitat-atmosferica\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"EL DIPOL OROGR\u00c0FIC I LA INESTABILITAT ATMOSF\u00c8RICA - 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