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The Formosat-3/COSMIC satellite constellation, performing radio occultation measurements, allows for an adequate measurement density in space and time to determine the temperature diurnal tide typical for one month, i.e., on a monthly basis. In this initial study on the topic we investigated the diurnal amplitude and phase between 4 km and 35 km altitude in different geographical regions in July 2007. The tropical diurnal tide shows a distinctive downward phase progression. The corresponding amplitude is increasing towards higher altitudes but it always remains smaller than 0.5 K up to an altitude of 35 km. Natural temperature variability within large latitudinal domains seems to interfere with the diurnal tide, which complicates the interpretation of our extratropical results. We found maximum temperature amplitude within a day in the afternoon at high latitudes with an increase in amplitude with altitude. The tide is more pronounced in the winter hemisphere.
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Acknowledgements
We thank CelesTrak (Colorado Springs, CO, USA) for the provision of Formosat-3/COSMIC Two-Line Element-files, UCAR/CDAAC (Boulder, CO, USA) for providing Formosat-3/COSMIC data and ECMWF (Reading, UK) for analysis data. The work was carried out with financial support from the Austrian Science Fund (FWF) under research grant P18837 (CLIMROCC). UF received financial support from the Max Kade Foundation (New York, NY, USA) and from UCAR.
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Pirscher, B., Foelsche, U., Borsche, M., Kirchengast, G. (2009). Sampling of the Diurnal Tide of Temperature Using Formosat-3/COSMIC Data. In: Steiner, A., Pirscher, B., Foelsche, U., Kirchengast, G. (eds) New Horizons in Occultation Research. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00321-9_11
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