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Hayashi spectra of the northern hemisphere mid-latitude atmospheric variability in the NCEP–NCAR and ECMWF reanalyses

Content Provider	Springer Nature Link
Author	Dell’Aquila, Alessandro Lucarini, Valerio Ruti, Paolo M. Calmanti, Sandro
Copyright Year	2005
Abstract	We compare 45 years of the reanalyses of National Center for Environmental Prediction–National Center for Atmospheric Research and European Center for Mid-Range Weather Forecast in terms of their representation of the mid-latitude winter atmospheric variability for the overlapping time frame 1957–2002. We adopt the classical approach of computing the Hayashi spectra of the 500 hPa geopotential height fields and we introduce an ad hoc integral measure of the variability observed in the Northern Hemisphere on different spectral subdomains. Discrepancies are found especially in the pre-satellite years of the records in the high frequency-high wavenumber propagating waves. This implies that in the pre-satellite period the two datasets have a different representation of the baroclinic available energy conversion processes. Minor differences are also found in the description of low frequency–low wavenumber standing waves. We observe a positive impact of the satellite data on the representation of wave activity over the oceanic sectors in the period starting from 1979, in particular on the description of high frequency variability. Since in the pre-satellite period the assimilated data are more scarce, predominately over the oceans, and of lower quality than found later on, they provide a weaker constraint to the model dynamics. Therefore, the resulting discrepancies in the reanalysis products may be mainly attributed to differences in the models’ behaviour.
Starting Page	639
Ending Page	652
Page Count	14
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	25
Issue Number	6
e-ISSN	14320894
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-08-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Oceanography Meteorology/Climatology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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