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Experiments of GPS slant path data assimilation with an advanced MM5 4DVAR system

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In a previous study the authors developed and optimized tools for 4 -dimensional variational assimilation ( 4 DVAR) of Global Positioning System (GPS) ground-based Slant Total Delay (STD) data in the framework of the Mesoscale Model 5 (MM5) system. In this study, advantage is taken from the parallel implementation of 4DVAR and the availability of STD data processed at the Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), providing data for a large and continuously operating network of groundbased receivers in Germany. The results of two long-term assimilation experiments are presented. The first assimilation experiment, performed over a period of two weeks (1–14 August 2007), shows that the impact in STD observation space of an independent network of GPS receivers is positive. After the assimilation window the impact is decreasing with time, lasting in average for 12 h. The second assimilation experiment, performed over a period of one month (1–31 August 2007), indicates that the impact on the precipitation forecast is weak but positive.

In einer vorangegangenen Studie entwickelten und optimierten die Autoren Werkzeuge zur 4-Dimensionalen Variationalen Assimilation (4DVAR) von boden-gestützten Global Positioning System (GPS) Slant Total Delay (STD) Daten im Rahmen des Mesoskaligen Modells 5 (MM5). In dieser Studie, ziehen wir Vorteil aus der parallelen Implementierung der 4 DVAR und der Verfügbarkeit von STD Daten, die am GFZ Potsdam für ein großes und kontinuierlich operierendes Netzwerk von boden-gestützten Empfängern in Deutschland abgeleitet werden. Die Resultate von zwei Langzeitassimilationsexperimenten werden gezeigt. Das erste Experiment, über eine Periode von zwei Wochen (1–14 August 2007), zeigt, dass der Impakt im STD Beobachtungsraum eines unabhäangigen Netzwerks von Empfäangern positiv ist. Nach dem Assimilationsfenster nimmt der Impakt ab und häalt im Mittel für 12 Stunden an. Das zweite Assimilationsexperiment, üuber eine Periode von einem Monat (1–31 August 2007), zeigt, dass der Impakt in der Niederschlagsvorhersage schwach aber positiv ist
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Document Type: Research Article

Publication date: 2011-04-01

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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