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| Titel |
The mass budget and hemispheric divergent wind in ECMWF Reanalyses |
| VerfasserIn |
Paul Berrisford, Per Kallberg, Shinya Kobayashi, Dick Dee, Sakari Uppala, Adrian Simmons, Paul Poli |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250040582
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| Zusammenfassung |
| It has long been known that one of the greatest sources of uncertainty in
atmospheric analyses originates in the divergent wind. This leads to analyses
containing spurious mass fluxes which are related to erroneous surface
pressure tendencies. In this work, the mass budget and conservation of global
dry mass are investigated using monthly mean diagnostics from the ECMWF
Interim Reanalysis (ERA-Interim) and ERA-40. The results are used to infer
the quality of the analysed mass field. Then we examine the simple case of
the vertically integrated hemispheric mass divergence, which is equivalent to
the cross equatorial mass flux. The improvements in the quality of this
mass divergence in ERA-Interim over that in ERA-40 are discussed. |
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