Other
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aipc..106..441h&link_type=abstract
AIP Conference Proceedings, Volume 106, pp. 441-447 (1984).
Other
Climatology, Climate Change And Variability, Winds And Their Effects, Weather Analysis And Prediction
Scientific paper
Enstrophy and kinetic energy flux functions calculated from observed data from the winters of 1976-77 and 1978-79 are examined to compare the nonlinear cascading properties of blocking and nonblocking periods. During 1978-79 a more pronounced upscale cascade of kinetic energy as well as an upscale cascade of enstrophy from intermediate to planetary- scale wavenumbers was found during block periods as compared to nonblocking. During 1976-77, similar results appeared for a case of Rex blocking but not for the persistent, greatly amplified planetary wave pattern in January and February 1977 (as identified by Charney, et al.).
The predictability time based on the enstrophy flux function showed an increased predictability for the January-February 1977 event but no significant differences between the other blocking cases compared to the nonblocking sample. However, the reversal of the low wavenumber enstrophy cascade during blocking does suggest that blocking may be more persistent (due to reduced dissipation of the large-scale circulation) and therefore more predictable. Some possible implications for theoretical modelling are discussed.
Hansen Anthony R.
Sutera Alfonso
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