Research Article

Scale Analysis of Blocking Events from 2002 to 2004: A Case Study of an Unusually Persistent Blocking Event Leading to a Heat Wave in the Gulf of Alaska during August 2004

Figure 2

(a) The blocking area averaged planetary-scale 500 hPa height (m) versus time (days), for a stationary box (20°N to 60°N and 290°E to 230°E), in the midlatitude northern hemispheric flow. The dashed dotted horizontal line defines the monthly mean value for the planetary-scale height. The left vertical upward arrow marks the beginning, whereas the right vertical upward arrow marks the end of the selected blocking event; (b) same as Figure 2(a) except for the synoptic-scale height.
610263.fig.002a
(a)
610263.fig.002b
(b)