Scaling of GNSS radio occultation impact with observation number using an ensemble of data assimilations
Healy, Sean ; Harnisch, Florian ; Bauer, Peter ; English, Steve
A question that has arisen in the context of designing the future GOS is how the impact of GNSS-RO measurements is likely to be enhanced if the number can be increased significantly above the 2,500 to 3,000 observations that are currently available. This is particularly relevant because new GNSS systems, such as Galileo, could increase the GNSS-RO observation number. ECMWF has recently completed a Galileo Science Study, funded by the European Space Agency (ESA), to address this question. This involved investigating the impact of up to 128,000 GNSS-RO observations per day (Harnisch et al., 2013). The Galileo Science Study supports the case for a considerable increase in the number of GNSS-RO measurements above the present day levels. More specifically, the results indicate that we should be aiming for at least 16,000 to 20,000 operational GNSS-RO measurements per day, in the coming years. These results have helped inform a recent revision of the WMO 'Vision for the Global Observing System in 2025'.
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