Characteristics of Short-term Tidal Variability of DW1 from daily to solar cycle time scales in eCMAM30 and SABER
Abstract
Wavelet analysis on DW1 (the migrating diurnal tide) using data from the extended Canadian Middle Atmospheric Model (eCMAM30) run (1979-2010) and the sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on NASA's TIMED (Thermosphere Ionosphere Mesosphere Energetics Dynamics) satellite revealed strong short term tidal variability on time scales from few days to 1 month apart from the inter-annual, seasonal and intra-seasonal variabilities. Atmospheric tides have been observed to fluctuate on short-term time scales at the periods of planetary waves (few days to 30 days). In this research we investigate the tidal variability of DW1 as a function of the inter-annual variations such as solar flux, QBO, and ENSO, and seasonal harmonics (12, 6, 4 and 3 months) based on the regression model. We then further investigate the statistical properties (covariance, autocorrelation and time dependent probability density functions) of the short-term tidal variability with periods less than 30 days. The relative contributions from the quasi 23-day, quasi 16-day, and quasi 10-day waves to these statistical properties are noted.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E3552V