Observed baroclinic Energy Conversions in Wavenumbers Domain for Three Winters: A Time Series Analysis

Schilling, Heinz-Dieter

doi:10.1175/1520-0493(1987)115<0520:obeciw>2.0.co;2

Cited by 5 publications

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“…For comparison M'/a is also shown for rn = 3, rn = 7. Note that positive values of unnormalized M,,, are more frequent than negative ones (see Schilling, 1987). The frequency distributions of N,,, for different rn are similar.…”

Section: Probabilitiesmentioning

confidence: 83%

“…Hansen, 1986;Schilling, 1986). When these episodes are very long-lived the second conversion C(A,,,K,,,) is also large in all probability (Schilling, 1987). It was this ultralong wave behaviour which has initiated this study.…”

Section: Baroclic Activity Of Ultralong Wavesmentioning

confidence: 91%

“…This parameter 1 1 is the sum of normalized imbedded (see also Schilling, 1987). As noted in the Introduction, situations with large M i (greater than a,,,, say) are of special interest for ultralong waves.…”

Section: Probabilitiesmentioning

confidence: 97%

“…On a statistical basis, they are correlated less for small m (ultralong waves) than for synoptic scales (e.g., m = 5,6,7). However, persistent large valued C(A,A,) conversions are indicative for large C(A,K,), leading to a better than normal correspondence between the two (Schilling, 1987). In this sense, we consider waves m with large input C(ATA,) to be baroclinically active if K,,, grows fast at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Baroclinic outbreak episodes in wavenumber domain

Schilling¹

1988

Tellus A: Dynamic Meteorology and Oceanography

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In contrast to the common definition of anomalous atmospheric flow by persistent and localized geopotential height anomalies, we define significant excursions from normal conditions by persistent anomalies of a single spectral energy conversion on a circumpolar scale. Whereas amplification of transient geopotential height or streamfunction anomalies generally involves a variety of possible processes and complex energetics, our approach defines strongly distorted energetics of a certain kind. With data covering 10 years (1967)(1968)(1969)(1970)(1971)(1972)(1973)(1974)(1975)(1976), we study baroclinic energy conversions from zonal mean to zonal wavenumber m available potential energy, C(A,A,), when these exceed the long-term average by more than a standard deviation for at least 3 consecutive days. During these episodes, called baroclinic outbreaks (BO), C(A,K,,,) and the kinetic energy of wave m, K,,,, are also large in all probability. Although short BO cases are frequent for all m, there is a secondary maximum of frequency at about 7 days for the ultralong wave m = 2. Composite energetics of BO's are presented, and a profound transformation of the 500 mb flow is shown for a long lasting m = 2 BO event.

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Section: Probabilitiesmentioning

confidence: 83%

Section: Baroclic Activity Of Ultralong Wavesmentioning

confidence: 91%

Section: Probabilitiesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Baroclinic outbreak episodes in wavenumber domain

Schilling¹

1988

Tellus A: Dynamic Meteorology and Oceanography

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“…This finding may indicate that there are two modes of baroclinic activity: a series of small fast fluctuating 'kicks' with some major 'kicks' Tellus 40A (1988). imbedded (see also Schilling, 1987). As noted in the Introduction, situations with large M i (greater than a,,,, say) are of special interest for ultralong waves.…”

Section: Probabilitiesmentioning

confidence: 95%

Baroclinic outbreak episodes in wavenumber domain

Schilling¹

1988

Tellus A

Self Cite

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In contrast to the common definition of anomalous atmospheric flow by persistent and localized geopotential height anomalies, we define significant excursions from normal conditions by persistent anomalies of a single spectral energy conversion on a circumpolar scale. Whereas amplification of transient geopotential height or streamfunction anomalies generally involves a variety of possible processes and complex energetics, our approach defines strongly distorted energetics of a certain kind. With data covering 10 years (1967)(1968)(1969)(1970)(1971)(1972)(1973)(1974)(1975)(1976), we study baroclinic energy conversions from zonal mean to zonal wavenumber m available potential energy, C (A,A,), when these exceed the long-term average by more than a standard deviation for at least 3 consecutive days. During these episodes, called baroclinic outbreaks (BO), C(A,K,,,) and the kinetic energy of wave m, K,,,, are also large in all probability. Although short BO cases are frequent for all m, there is a secondary maximum of frequency at about 7 days for the ultralong wave m = 2. Composite energetics of BO's are presented, and a profound transformation of the 500 mb flow is shown for a long lasting m = 2 BO event.

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Observational Aspects of the Low-Frequency Intraseasonal Variability of the Atmosphere in Middle Latitudes

Pandolfo

1993

Advances in Geophysics

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Observed baroclinic Energy Conversions in Wavenumbers Domain for Three Winters: A Time Series Analysis

Cited by 5 publications

References 0 publications

Baroclinic outbreak episodes in wavenumber domain

Baroclinic outbreak episodes in wavenumber domain

Baroclinic outbreak episodes in wavenumber domain

Observational Aspects of the Low-Frequency Intraseasonal Variability of the Atmosphere in Middle Latitudes

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