Perspicacious indicators of atmospheric blocking

Details Perspicacious indicators of atmospheric blocking Perspicacious indicators of atmospheric blocking

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106125s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 6, CiteID L06125

Physics

25

Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics, Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Synoptic-Scale Meteorology

Scientific paper

A novel dynamically-based approach is introduced to identify, describe and diagnose atmospheric blocking events. The approach is based upon the potential vorticity perspective and takes into account the three-dimensional structure of the phenomenon. It is argued that the essence of a blocking anomaly is located in the upper troposphere, just below the tropopause. The associated novel blocking indicators are derived from two-dimensional fields at 6-hourly temporal resolution, and provide information on the spatial scale, shape, amplitude and movement of blocks. A northern hemisphere winter (DJF) climatology for the ERA15 period (1979-1993) is presented and comments are made on the relationship between the indicators and previous blocking indices.

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