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| Titel |
Ocean feature models - their use and effectiveness in ocean acoustic forecasting |
| VerfasserIn |
J. Small, L. Shackleford, G. Pavey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 15, no. 1 ; Nr. 15, no. 1, S.101-112 |
| Datensatznummer |
250012578
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| Publikation (Nr.) |
 copernicus.org/angeo-15-101-1997.pdf |
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| Zusammenfassung |
| The aim of this paper is to test the
effectiveness of feature models in ocean acoustic forecasting. Feature models
are simple mathematical representations of the horizontal and vertical
structures of ocean features (such as fronts and eddies), and have been used
primarily for assimilating new observations into forecasts and for compressing
data. In this paper we describe the results of experiments in which the models
have been tested in acoustic terms in eddy and frontal environments in the
Iceland Faeroes region. Propagation-loss values were obtained with a 2D
parabolic-equation (PE) model, for the observed fields, and compared to PE
results from the corresponding feature models and horizontally uniform
(range-independent) fields. The feature models were found to represent the
smoothed observed propagation-loss field to within an rms error of 5 dB for the
eddy and 7 dB for the front, compared to 10–15-dB rms errors obtained with the
range-independent field. Some of the errors in the feature-model propagation
loss were found to be due to high-amplitude 'oceanographic noise' in the field.
The main conclusion is that the feature models represent the main acoustic
properties of the ocean but do not show the significant effects of small-scale
internal waves and fine-structure. It is recommended that feature models be used
in conjunction with stochastic models of the internal waves, to represent the
complete environmental variability. |
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