Perspicacious indicators of atmospheric blocking
Article first published online: 27 MAR 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 6, March 2004
How to Cite
2004), Perspicacious indicators of atmospheric blocking, Geophys. Res. Lett., 31, L06125, doi:10.1029/2003GL019341., , and (
- Issue published online: 27 MAR 2004
- Article first published online: 27 MAR 2004
- Manuscript Accepted: 25 FEB 2004
- Manuscript Revised: 9 FEB 2004
- Manuscript Received: 20 DEC 2003
 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.