Sensitivity of medium-range weather forecasts to the use of reference atmosphere View Full Text


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Article Info

DATE

1990-05

AUTHORS

Chen Jiabin, A. J. Simmons

ABSTRACT

In this paper, the authors develop the earlier work of Chen Jiabin et al. (1986). In order to reduce spectral truncation errors, the reference atmosphere has been introduced in ECMWF model, and the spectrally-represented variables, temperature, geopotential height and orography, are replaced by their deviations from the reference atmosphere. Two modified semi-implicit schemes have been proposed to alleviate the computational instability due to the introduction of reference atmosphere. Concerning the deviation of surface geopotential height from reference atmosphere, an exact computational formulation has been used instead of the approximate one in the earlier work. To reduce aliasing errors in the computations of the deviation of the surface geopotential height, a spectral fit has been used slightly to modify the original Gaussian grid-point values of orography. A series of experiments has been performed in order to assess the impact of the reference atmosphere on ECMWF medium—range forecasts at the resolution T21, T42 and T63. The results we have obtained reveal that the reference atmosphere introduced in ECMWF spectral model is generally beneficial to the mean statistical scores of 1000–200 hPa height 10-day forecasts over the globe. In the Southern Hemisphere, it is a clear improvement for T21. T42 and T63 throughout the 10-day forecast period. In the Northern Hemisphere, the impact of the reference atmosphere on anomaly correlation is positive for resolution T21, a very slightly damaging at T42 and almost neutral at T63 in the range of day 1 to day 4. Beyond the day 4 there is a clear improvement at all resolutions. More... »

PAGES

275-293

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf03179761

DOI

http://dx.doi.org/10.1007/bf03179761

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040419092


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