Blocking Detection Based on Synoptic Filters | Zendy

Bernd Schalge | Zendy; Richard Blender | Zendy; Klaus Fraedrich | Zendy

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Blocking Detection Based on Synoptic Filters

Author(s) -

Bernd Schalge,

Richard Blender,

Klaus Fraedrich

Publication year - 2011

Publication title -

advances in meteorology

Language(s) - English

Resource type - Journals

eISSN - 1687-9317

pISSN - 1687-9309

DOI - 10.1155/2011/717812

Subject(s) - blocking (statistics) , geopotential height , filter (signal processing) , anomaly (physics) , quantile , mathematics , geography , computer science , meteorology , statistics , physics , precipitation , condensed matter physics , computer vision

The Tibaldi-Molteni blocking index is supplemented by additional filter criteria to eliminate cut-off lows and subsynoptic structures. We introduce three blocking filters and analyse their sensitivities: (i) a quantile filter requiring a minimum geopotential height anomaly to reject cut-off lows, (ii) an extent filter to extract scales above a minimum zonal width, and (iii) a persistence filter to extract events with a minimum duration. Practical filter application is analysed in two case studies and the blocking climatologies for the Northern and the Southern Hemisphere

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