Temperature Tides Across the Mid‐Latitude Summer Turbopause Measured by a Sodium Lidar and MIGHTI/ICON
Temperature Tides Across the Mid‐Latitude Summer Turbopause Measured by a Sodium Lidar and MIGHTI/ICON
复制标题
使用钠激光雷达和 MIGHTI/ICON 测量中纬度夏季涡轮顶温度潮汐
DOI:
10.1029/2021jd035321
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Immel, T. J.
中科院分区:
文献类型:
--
作者:
Yuan, T.;Stevens, M. H.;Englert, C. R.;Immel, T. J.
Local full diurnal coverage of temperature variations across the turbopause (∼90–115 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 Michelson interferometer for global high‐resolution thermospheric imaging (MIGHTI)/Ionospheric connection explorer (ICON) daytime observations made in the same vicinity. In this study, utilizing this hybrid data set during summer 2020 between June 12th and July 15th, we retrieve the temperature signatures of diurnal and semidiurnal tides in this region. The tidal amplitudes of both components have similar vertical variation with increasing altitude: less than 5 K below ∼98 km but increase considerably above, up to 19 K near 104 km. Both experience significant dissipation near turbopause altitudes, down to ∼12 K up to 113 km for the diurnal tide and ∼13 K for the semidiurnal tide near 110 km. In addition, while the semidiurnal tidal behavior is consistent with the theoretical predictions, the diurnal amplitude is considerably larger than what is expected in the turbopause region. The tidal phase profile shows a dominance of tidal components with a long vertical wavelength (longer than 40 km) for the semidiurnal tide. On the other hand, the diurnal tide demonstrates close to an evanescent wave behavior in the turbopause region, which is absent in the model results and Thermosphere ionosphere mesosphere energetics and dynamics (TIMED)/Sounding of the atmosphere using broadband radiometry (SABER) observations.
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