Blocking Detection Based on Synoptic Filters

Schalge, Bernd; Blender, Richard; Fraedrich, Klaus F.

doi:10.1155/2011/717812

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Blocking Detection Based on Synoptic Filters

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Schalge, B., Blender, R., & Fraedrich, K. F. (2011). Blocking Detection Based on Synoptic Filters. ADVANCES IN METEOROLOGY, 717812. doi:10.1155/2011/717812.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-885E-4

Abstract

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.