Annular modes and apparent eddy feedbacks in the Southern Hemisphere


Autoria(s): Byrne, N. J.; Shepherd, T. G.; Woollings, T.; Plumb, R. A.
Data(s)

21/04/2016

Resumo

Lagged correlation analysis is often used to infer intraseasonal dynamical effects but is known to be affected by non-stationarity. We highlight a pronounced quasi-two-year peak in the anomalous zonal wind and eddy momentum flux convergence power spectra in the Southern Hemisphere, which is prima facie evidence for non-stationarity. We then investigate the consequences of this non-stationarity for the Southern Annular Mode and for eddy momentum flux convergence. We argue that positive lagged correlations previously attributed to the existence of an eddy feedback are more plausibly attributed to non-stationary interannual variability external to any potential feedback process in the mid-latitude troposphere. The findings have implications for the diagnosis of feedbacks in both models and re-analysis data as well as for understanding the mechanisms underlying variations in the zonal wind.

Formato

text

text

Identificador

http://centaur.reading.ac.uk/63813/7/Byrne_et_al-2016-Geophysical_Research_Letters.pdf

http://centaur.reading.ac.uk/63813/1/Byrne_et_al-2016-Geophysical_Research_Letters.pdf

Byrne, N. J., Shepherd, T. G. <http://centaur.reading.ac.uk/view/creators/90004685.html>, Woollings, T. <http://centaur.reading.ac.uk/view/creators/90000944.html> and Plumb, R. A. (2016) Annular modes and apparent eddy feedbacks in the Southern Hemisphere. Geophysical Research Letters, 43. ISSN 0094-8276 doi: 10.1002/2016GL068851 <http://dx.doi.org/10.1002/2016GL068851>

Idioma(s)

en

en

Publicador

American Geophysical Union

Relação

http://centaur.reading.ac.uk/63813/

creatorInternal Shepherd, T. G.

creatorInternal Woollings, T.

10.1002/2016GL068851

Direitos

cc_by_nc_nd_4

Tipo

Article

PeerReviewed