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Tidal effects on stratospheric temperature series derived from successive advanced microwave sounding units

Philippe Keckhut 1 Beatriz M. Funatsu 2, 3 Chantal Claud 2 Alain Hauchecorne 1 
1 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
3 LETG - Rennes - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : Stratospheric temperature series derived from the Advanced Microvave Sounding Unit on board successive NOAA satellites reveal during periods of overlap some bias and drifts. Part of the reason for these discrepancies could be associated with atmospheric tides as the orbits of these satellites drifted, inducing large changes in the actual time of measurements. NOAA 15 and 16, which exhibit a long period of overlap, allow deriving diurnal tides that can correct such temperature drifts. The characteristics of the derived diurnal tides during summer periods is in good agreement with those calculated with the Global Scale Wave model, indicating that most of the observed drifts is likely due to the atmospheric tides. Cooling can be biased by a factor of 2, if time of measurements are not considered. When diurnal tides are considered trends derived with temperature lidar series are in good agreement with AMSU series. Future adjustments of temperature time series based on successive AMSU instruments will require to consider corrections associated with the local time of measurements.
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Philippe Keckhut, Beatriz M. Funatsu, Chantal Claud, Alain Hauchecorne. Tidal effects on stratospheric temperature series derived from successive advanced microwave sounding units. Quarterly Journal of the Royal Meteorological Society, Wiley, 2015, 141 (687), pp.477-483. ⟨10.1002/qj.2368⟩. ⟨hal-00989750⟩

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