Index Geophysics

eng Numerical simulation of the Adriatic cyclone development

hrv Numerička simulacija razvoja Jadranske ciklone

eng This paper represents the first attempt to simulate the influence of the Dinaric Alps on the Adriatic cyclone using a high resolution hydrostatic model ALADIN. The reference experiment and two sensitivity studies are carried out to study the orography and diabatic effects on the cyclone development and maintenance. Verification confirms that the appearance of “twin cyclones” on either side of the Apennine peninsula is a realistic feature. The influence of Dinaric Alps is visible in a high-low couplet over the orography and strong winds behind the cyclone and along the coast. In the absence of the Dinaric Alps the cyclone is not bounded to this orography and the low pressure field quickly spreads over the entire Balkan peninsula and weakens. The absence of latent heat release leads to the weaker cyclonic circulation. An intercomparison of three experiments shows that the orographically induced pressure gradients, and not the pressure itself, are essential for the cyclone maintenance. These experiments have shown that the Adriatic cyclone is mainly induced by the Alpine orography whereas the Dinaric Alps through upstream blocking influence the subsynoptic processes over the Adriatic area.

hrv U radu su prikazani prvi rezultati simulacije utjecaja Dinarida na Jadransku ciklonu pomoću hidrostatičkog modela visoke rezolucije ALADIN. Izvedeni su referentni eksperiment i dva dodatna eksperimenta za ispitivanje utjecaja orografije i vlage na
razvoj i održanje ciklone. Verifikacija potvrđuje da je pojava »ciklona blizanki« na obje strane Apeninskog poluotoka realistična osobina. Utjecaj Dinarida se očituje u paru visokog i niskog tlaka preko orografije i jakim vjetrovima iza ciklone i uzduž obale. U
odsutnosti Dinarida ciklona nije više vezana uz tu orografiju već se polje niskog tlaka brzo proširuje preko cijelog Balkanskog poluotoka slabeći. Odsustvo vlažnih procesa uzrokuje slabiju ciklonalnu cirkulaciju. Usporedba tri eksperimenta pokazuje da su orografski uzrokovani gradijenti tlaka, a ne tlak sam, bitni za održanje ciklone. Ovi eksperimenti pokazali su da je Jadranska ciklona prvenstveno uvjetovana Alpskom orografijom dok Dinaridi, blokiranjem zraka u navjetrini, utječu na podsinoptičke procese na području Jadrana.

Brzović, N.

Jurčec, V.

eng Numerical simulation; cyclone development; Adriatic cyclone; influence of orography

hrv numeričke simulacije; razvoj ciklone; ciklone na Jadranu; utjecaj orografije

Andrija Mohorovicic Geophysical Institute

1997

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https://hrcak.srce.hr/17776

eng https://hrcak.srce.hr/file/27545

Geofizika

ISSN 0352-3659 (Print)

ISSN 1846-6346 (Online)

Volume 14

Issue 1

eng

info:eu-repo/semantics/openAccess

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