The following summaries were presented at the 84th AMS Annual Meeting in Seattle, Washington, 11-15 January 2003. FIG . I. Zonal average number cases of 850-hPa relative vorticity anomalies over the ocean in the 5-days average data fro m the NCEP/NCA R reanalysis (period 1980-98), classified according to their duration. Annual and semi- annual Fourier modes have been subtracted from the original data in defining anomalies. Only anomalies that exceed one-fourth of th e local standard deviation are considered, (a) Total cases; (b) locally coupled with SSTA ; and (c) locally uncoupled. interaction process. The results over-cold, and anticyclonic-over- COUPLIN G ATMOSPHERIC ANOMALIES WITH THE OCEAN have important implications for warm. seasonal forecasts based on ocean- The distribution of the zonal Atmospheric anomalies have a dif- ferent character depending on driving atmosphere models. average number of atmospheric anomalies, classified according to whether and how they are coupled We examined the number of with surface boundary conditions. cases of high-amplitude low-level their duration (Fig. 1) shows that, as the duration increases, the num- For instance, in the extratropics, atmospheric vorticity anomalies ocean-atmosphere coupling in- that are locally coincident ber decreases in all latitudes, par- ticularly in the extratropics, and creases
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Feb 1, 2004
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