Search Results

You are looking at 1 - 4 of 4 items for :

  • North America x
  • Jets and Annular Structures in Geophysical Fluids (Jets) x
  • All content x
Clear All
O. Martius, C. Schwierz, and H. C. Davies

are confirmed by a numerical experiment of Orlanski (2003) . Since the effects of the Pacific–North American (PNA) pattern on the eastern Pacific flow conditions are comparable to those during ENSO ( Horel and Wallace 1981 ), a similar variability of the cyclone life cycles can be expected for the opposite PNA flow states. Franzke et al. (2004) and Benedict et al. (2004) propose a close link between the life cycle of extratropical cyclones and the North Atlantic Oscillation. Looking at a large

Full access
Thomas Jung and Peter B. Rhines

the topographic drag. While many investigations emphasize the primary role of Rocky Mountain orography in the North America/Atlantic stationary waves, we wonder whether “suction” on the lee slopes of Greenland may contribute to the mean climatology of the stationary waves in the Atlantic sector, in the mid- and upper troposphere. The EP fluxes shown here do not in themselves establish a causal link to Greenland’s orographic forcing. However, causality is suggested b y Petersen et al. (2003) who

Full access
I. G. Watterson

1. Introduction “What is meant by the words annular and mode?” asked Ambaum et al. (2001 , p. 3506), with respect to atmospheric variability. This is a fair question, since the words are hard to find in meteorological glossaries. A typical dictionary will offer “ring-shaped” and “most frequent value in a dataset” (matching the meaning for mode given in the American Meteorological Society Glossary of Meteorology ). A geographical pattern of variability that features a zonal band does form a

Full access
Francis Codron

Indian and Pacific sectors are contiguous, and there is no discontinuity in the mean jets or storm tracks like that caused by the North American continent in the Northern Hemisphere. To describe the behaviors of the jets in the two sectors independently from EOF analysis, monthly time series of the poleward position and speed of the midlatitude jet were computed for both sectors. The 850-hPa wind averaged over the two longitude ranges was used, as it is a better measure of eddy-driven jets than upper

Full access