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SUBJECTIVE SYNOPTIC CLASSIFICATIONS: HESS-BREZOWSKY „GROSSWETTERLAGEN”, PÉCZELY CLASSIFICATION

SUBJECTIVE SYNOPTIC CLASSIFICATIONS: HESS-BREZOWSKY „GROSSWETTERLAGEN”, PÉCZELY CLASSIFICATION. Judit Bartholy, Rita Pongrácz. Department of Meteorology Eötvös Loránd University Budapest, Hungary.

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SUBJECTIVE SYNOPTIC CLASSIFICATIONS: HESS-BREZOWSKY „GROSSWETTERLAGEN”, PÉCZELY CLASSIFICATION

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  1. SUBJECTIVE SYNOPTIC CLASSIFICATIONS: HESS-BREZOWSKY „GROSSWETTERLAGEN”,PÉCZELY CLASSIFICATION Judit Bartholy, Rita Pongrácz Department of MeteorologyEötvös Loránd UniversityBudapest, Hungary

  2. HESS-BREZOWSKY „GROSSWETTERLAGEN”Subjective classification from 1952available daily codes: 1881-2007 Coding by: German Met. Service (DWD)1. Parameters used? SLP, AT-5002. Specific program/software available? No and yesReproducible? No3. Computer programming skill needed? No and yes4. Time and computer power? N/A5. Number of classes? 29+1 – possibly reduced by clustering6. Key patterns? Subjective definition7. Distance/similarity measure? No –Euclidean

  3. Coding process of Hess-Brezowsky classificationArea of consideration:00 (COST733)Target area: 07 (COST733) 07

  4. List of Hess-Brezowsky MCP types (29)------------------------Dominant flow:• 4 zonal • 7 mixed • 18 meridional------------------------C/A dominance: • 16 cyclonic • 13 anticyclonic

  5. Hess-Brezowsky MCP typesSeasonal and annual frequency of cyclonic and anticyclonic patterns

  6. PÉCZELY MCP TYPESSubjective classification from 1957available daily codes: 1881-2007 Coding by: György Péczely (Szeged) / Csaba Károssy (Szombathely)1. Parameters used? SLP2. Specific program/software available? No and yesReproducible? No3. Computer programming skill needed? No and yes4. Time and computer power? N/A5. Number of classes? 13 – possibly reduced by clustering6. Key patterns? Subjective definition7. Distance/similarity measure? No –Euclidean

  7. Coding process of Péczely classificationArea of consideration:00 (COST733)Target area: Carpathian basinsouthern 07 and northern 10 (COST733) 07 10

  8. List of Péczely MCP types (13)----------------------Dominant flow:• 5 zonal • 2 central • 6 meridional------------------------C/A dominance: • 6 cyclonic • 7 anticyclonic Meridional, northern types (1) Cold front with meridional flow (mCc) (2) Anticyclone over the British Isles (AB) (3) Cold front arising from a Mediterranean cyclone (CMc) Meridional, southern types (4) Warm front arising from a meridional cyclone (mCw) (5) Anticyclone located east of the Carpathian Basin (Ae) (6) Warm front arising from a Mediterranean cyclone (CMw) Zonal, western types (7) Zonal cyclone (zC) (8) Anticyclone located west of the Carpathian Basin (Aw) (9) Anticyclone located south of the Carpathian Basin (As) Zonal, eastern types (10) Anticyclone located north of the Carpathian Basin (An) (11) Anticyclone located over the Scandinavian Peninsula (AF) Central types (12) Anticyclone located over the Carpathian Basin (A) (13) Cyclone located above the Carpathian Basin (C)

  9. Typical sea-level pressure maps of the Péczely MCP types Subjective classification using 13 types Definition: Gy. Péczely - 1957 Cyclonic (mCc, CMc, mCw, CMw, zC, C) and Anticyclonic (AB, Ae, As, Aw, An, AF, A) dominance is separated(relative frequencies are 34% and 66%, resp.) mCc AB CMc 7%, mostly in summer 6%, more in summer 3%, more in spring Ae zC mCw As CMw 9%, more in spring 13%, more in autumn / winter 8%, more in winter / spring 4%, more in winter 5%, more in winter Aw An AF A C 16%, more in summer 12%, less in autumn 4%, more in summer 11%, more in summer / autumn 2%, more in spring / summer The annual mean relative frequency is determined using the 1961-1990 baseperiod

  10. Péczely MCP typesSeasonal and annual frequency of cyclonic and anticyclonic patterns

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