FIG. 23. Seasonal 200-hPa
streamfunction (contours) and anomalies (shaded) during (a) DJF 199899, (b) MAM
1999, (c) JJA 1999, and (d) SON 1999. Units are 1.0 x 10-6 m2 s-1.
Contour interval is 10. In the Northern Hemisphere, positive (negative) values indicate an
anticyclonic (cyclonic) circulation. In the Southern Hemisphere, negative (positive)
values indicate a cyclonic (anticyclonic) circulation. Anomalies are departures from the
197995 base period means.