Low-frequency suppression of Southern Hemisphere tropospheric eddy heat flux
نویسندگان
چکیده
منابع مشابه
Transformed eddy-PV flux and positive synoptic eddy feedback onto low-frequency flow
Interaction between synoptic eddy and lowfrequency flow (SELF) has been the subject of many studies. In this study, we further examine the interaction by introducing a transformed eddy-potential-vorticity (TEPV) flux that is obtained from eddy-potential-vorticity flux through a quasi-geostrophic potential-vorticity inversion. The main advantage of using the TEPV flux is that it combines the eff...
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Ocean-atmosphere interactions are complex and extend over a wide range of temporal and spatial scales. Among the key components of these interactions is the ocean-atmosphere (latent and sensible) turbulent heat flux (THF). Here, based on daily optimally-interpolated data from the extratropical Southern Hemisphere (south of 30°S) from a period 1985-2013, we analyze short-term variability and tre...
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Previous studies have demonstrated the key role of baroclinicity and thus the isentropic slope in determining the climatological-mean distribution of the tropospheric eddy fluxes of heat. Here the authors examine the role of variability in the isentropic slope in driving variations in the tropospheric eddy fluxes of heat about their long-term mean during Northern Hemisphere winter. On month-to-...
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The variability of the zonal-mean zonal wind in the Southern Hemisphere is studied using EOF analysis and momentum budget diagnostics of NCEP Reanalysis data (1978-1997). The leading EOF of the zonal-mean zonal wind is well separated from the remaining EOF’s and represents the north/south movement of the mid-latitude jet. Analysis of the momentum budget shows that a positive feedback between th...
متن کاملAnnular modes and apparent eddy feedbacks in the Southern Hemisphere
Lagged correlation analysis is often used to infer intraseasonal dynamical effects but is known to be affected by nonstationarity. We highlight a pronounced quasi 2 year peak in the anomalous zonal wind and eddy momentum flux convergence power spectra in the Southern Hemisphere, which is prima facie evidence for nonstationarity. We then investigate the consequences of this nonstationarity for t...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2017
ISSN: 0094-8276
DOI: 10.1002/2016gl072247