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| Titel |
The use of products from ground-based GNSS observations in meteorological nowcasting |
| VerfasserIn |
E. Terradellas, B. Téllez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 11th EGU Plinius Conference on Mediterranean Storms (2009) ; Nr. 26 (2010-07-22), S.77-82 |
| Datensatznummer |
250015985
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| Publikation (Nr.) |
 copernicus.org/adgeo-26-77-2010.pdf |
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| Zusammenfassung |
Convective rainfall is often focalized in areas of moisture convergence. A
close relationship between precipitation and fast variations of
vertically-integrated water vapour (IWV) has been found in numerous cases.
Therefore, continuous monitoring of atmospheric humidity and its spatial
distribution is crucial to the operational forecaster for a proper
nowcasting of heavy rainfall events.
The microwave signals continuously broadcasted by the Global Navigation
Satellite Systems (GNSS) satellites are influenced by the water vapour as
they travel through the atmosphere. Estimates of IWV retrieved from
ground-based GNSS observations may, then, constitute a source of information
on the horizontal distribution and the time evolution of atmospheric
humidity. At the Spanish Meteorological Agency (AEMET), a near-real-time map
of IWV estimates retrieved from ground GNSS measurements in the Iberian
Peninsula and West Mediterranean region is operationally built and presented
to the forecaster. The maps are generated every 15 minutes following a
one-dimensional variational assimilation scheme with the previous map as the
background state.
A case study is presented in order to illustrate some strengths and
weaknesses of the product, to assess the potential benefit of using GNSS
products in nowcasting and to define the steps to be done in order to make
use of the full potential of the method. |
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