<\/a><\/a>THE ROLE OF STRATOSPHERE-TROPOSPHERE ANOMALIES IN THE OCCURRENCE OF WIDESPREAD EXTREME LOW TEMPERATURES IN IRAN’S COLD SEASON FROM THE PERSPECTIVE OF POTENTIAL VORTICITY<\/span>
\nRola wirowo\u015bci potencjalnej w kontek\u015bcie oddzia\u0142ywa\u0144 mi\u0119dzy stratosfer\u0105 a troposfer\u0105 i jej wp\u0142yw na ujemne anomalie termiczne w Iranie w ch\u0142odnej porze roku
\n<\/span><\/span><\/p>\n

Mina Mirian, Mostafa Karampour, Sohrab Ghaedi<\/span><\/span><\/span>
\n<\/em>Przegl\u0105d Geofizyczny (2025) vol. 70, iss. 1-2, pp. 51-67<\/em><\/span>
\nhttps:\/\/doi.org\/10.32045\/PG-2024-054<\/span><\/p>\n

Tekst \/ Text<\/span><\/a><\/p>\n

Streszczenie
\n<\/strong>Niniejsze badanie analizuje rol\u0119 anomalii stratosferycznych i troposferycznych w wyst\u0119powaniu niskich temperatur powietrza w Iranie podczas sezonu ch\u0142odnego przy wykorzystaniu indeksu wirowo\u015bci potencjalnej (PV) w latach 1960\u20132010. Na podstawie 20% zanotowanych przypadk\u00f3w najni\u017cszych warto\u015bci temperatury zidentyfikowano rozleg\u0142e przestrzennie fale ch\u0142odu w okresie od wrze\u015bnia do marca. Dni charakteryzuj\u0105ce si\u0119 najni\u017cszymi warto\u015bciami temperatur pos\u0142u\u017cy\u0142y jako studia przypadk\u00f3w w celu analizy warunk\u00f3w cyrkulacyjnych determinuj\u0105cych wyst\u0105pienie silnego och\u0142odzenia. Oceniono wsp\u00f3\u0142zmienno\u015b\u0107 z wysoko\u015bci\u0105 geopotencja\u0142u na poziomach 1000 i 500 hPa oraz wirowo\u015b\u0107 potencjaln\u0105 na poziomach 50 i 500 hPa, a tak\u017ce na powierzchni izotropowej 330 K. W celu identyfikacji \u017ar\u00f3de\u0142 anomalii PV przeanalizowano tak\u017ce wilgotno\u015b\u0107 w\u0142a\u015bciw\u0105 na poziomie 700 hPa oraz dynamik\u0119 ruch\u00f3w pionowych powietrza na poziomach 500 i 1000 hPa. Uzyskane wyniki wykaza\u0142y, \u017ce anomalie wirowo\u015bci potencjalnej w stratosferze oraz jej intruzje w dolne warstwy troposfery by\u0142y g\u0142\u00f3wnymi czynnikami determinuj\u0105cymi wyst\u0119powanie fal ch\u0142odu w Iranie w okresie od wrze\u015bnia do marca.
\n<\/span><\/p>\n

S\u0142owa kluczowe:<\/strong> wirowo\u015b\u0107 potencjalna, stratosfera, troposfera, niska temperatura, Iran<\/span><\/p>\n

Abstract
\n<\/strong>This study investigates the role of stratosphere-troposphere anomalies in the occurrence of widespread extreme low temperatures in Iran’s cold season using the potential vorticity index from 1960 to 2010. Based on the lowest 20% of extreme temperatures, widespread cold periods during the cold half of the year (September-March) were identified, and the most severe period was selected. Days with widespread very low temperatures were chosen as case studies for each season to analyze the dynamical and synoptic patterns governing the severe cold period. Synoptic circulation patterns, including geopotential height at 1000 and 500 hPa levels, and dynamical patterns such as potential vorticity at 50 and 500 hPa levels and on the 330 K isentropic surface, were plotted and analyzed. Specific humidity at the 700 hPa level and vertical velocity at 500 and 1000 hPa levels were also examined to identify the origin of potential vorticity anomalies. The results revealed that dynamical anomalies of stratospheric potential vorticity and its downward intrusion into the troposphere were the main factors behind the occurrence of widespread extreme low temperatures in Iran’s cold season. This highlights the role of stratosphere-troposphere exchanges in the occurrence of widespread extreme low temperatures during the studied period.<\/span><\/p>\n

Keywords<\/strong>: Potential Vorticity, Stratosphere, Troposphere, Low Temperature, Iran<\/span><\/p>\n

 <\/p>\n

Article is licensed under <\/span>CC BY 4.0<\/span><\/strong><\/a><\/p>\n

<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

THE ROLE OF STRATOSPHERE-TROPOSPHERE ANOMALIES IN THE OCCURRENCE OF WIDESPREAD EXTREME LOW TEMPERATURES IN IRAN’S COLD SEASON FROM THE PERSPECTIVE OF POTENTIAL VORTICITY Rola wirowo\u015bci potencjalnej w kontek\u015bcie oddzia\u0142ywa\u0144 mi\u0119dzy stratosfer\u0105 a troposfer\u0105 i jej wp\u0142yw na ujemne anomalie termiczne…<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3013","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ptgeof.pl\/index.php?rest_route=\/wp\/v2\/pages\/3013","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ptgeof.pl\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ptgeof.pl\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ptgeof.pl\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ptgeof.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3013"}],"version-history":[{"count":4,"href":"https:\/\/ptgeof.pl\/index.php?rest_route=\/wp\/v2\/pages\/3013\/revisions"}],"predecessor-version":[{"id":3171,"href":"https:\/\/ptgeof.pl\/index.php?rest_route=\/wp\/v2\/pages\/3013\/revisions\/3171"}],"wp:attachment":[{"href":"https:\/\/ptgeof.pl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}