Na lidar and MIGHTI/ICON investigation on turbopause tidal waves

Local full diurnal coverage of temperature variations across the turbopause (~ 90 km to 115 km altitude) is achieved by combining the nocturnal observations of a Sodium (Na) Doppler lidar on the Utah State University (USU) campus (41.7?N, 248.2?E) and NASA MIGHTI/ICON daytime observations made in the same vicinity. In this paper, utilizing this hybrid dataset during summer 2020 between June 12th and July 15th, we retrieve the temperature signatures of diurnal and semidiurnal tidal waves in this region. The tidal amplitudes are similar for both components: less than 5 K below ~ 98 km but increase considerably above, up to 19 K near 104 km, while experiencing significant dissipation near turbopause altitudes ~ 110 km. The tidal phase profiles show dominance of tidal components with long vertical wavelength (longer than 40 km) for the semidiurnal tide. The diurnal tide demonstrates close to evanescent wave behavior in the turbopause region.