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| Titel |
Assimilation of stratospheric and mesospheric temperatures from MLS and SABER into a global NWP model |
| VerfasserIn |
K. W. Hoppel, N. L. Baker, L. Coy, S. D. Eckermann, J. P. McCormack, G. E. Nedoluha, D. E. Siskind |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 20 ; Nr. 8, no. 20 (2008-10-22), S.6103-6116 |
| Datensatznummer |
250006416
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| Publikation (Nr.) |
 copernicus.org/acp-8-6103-2008.pdf |
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| Zusammenfassung |
| The forecast model and three-dimensional variational data assimilation
components of the Navy Operational Global Atmospheric Prediction System
(NOGAPS) have each been extended into the upper stratosphere and mesosphere
to form an Advanced Level Physics High Altitude (ALPHA) version of NOGAPS
extending to ~100 km. This NOGAPS-ALPHA NWP prototype is used to
assimilate stratospheric and mesospheric temperature data from the Microwave
Limb Sounder (MLS) and the Sounding of the Atmosphere using Broadband
Emission Radiometry (SABER) instruments. A 60-day analysis period in January
and February 2006, was chosen that includes a well documented stratospheric
sudden warming. SABER and MLS temperatures indicate that the SSW caused the
polar winter stratopause at ~40 km to disappear, then reform at
~80 km altitude and slowly descend during February. The NOGAPS-ALPHA
analysis reproduces this observed stratospheric and mesospheric temperature
structure, as well as realistic evolution of zonal winds, residual
velocities, and Eliassen-Palm fluxes that aid interpretation of the
vertically deep circulation and eddy flux anomalies that developed in
response to this wave-breaking event. The observation minus forecast (O-F)
standard deviations for MLS and SABER are ~2 K in the mid-stratosphere
and increase monotonically to about 6 K in the upper mesosphere. Increasing
O-F standard deviations in the mesosphere are expected due to increasing
instrument error and increasing geophysical variance at small spatial scales
in the forecast model. In the mid/high latitude winter regions, 10-day
forecast skill is improved throughout the upper stratosphere and mesosphere
when the model is initialized using the high-altitude analysis based on
assimilation of both SABER and MLS data. |
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