The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011

Jacobi, Ch.; Fytterer, Tilo

doi:10.5194/ars-10-265-2012

Cited by 14 publications

(10 citation statements)

References 16 publications

(27 reference statements)

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“…The characteristics of the midlatitude TDT observed by radar have been described on few occasions (e.g. Beldon et al 2006;Jacobi and Fytterer 2012). Often, the zonal wind amplitude has been found to be larger than the meridional one.…”

Section: Introductionmentioning

confidence: 99%

Global distribution of the migrating terdiurnal tide seen in sporadic E occurrence frequencies obtained from GPS radio occultations

et al. 2014

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Global Positioning System radio occultation measurements by FORMOsa SATellite mission-3/Constellation Observing System for Meteorology, Ionosphere and Climate satellites were used to analyse the characteristics of the 8-h oscillation in sporadic E (E S) layers. Six-year averages based on the 3-monthly mean zonal means from December 2006 to November 2012 were constructed for the amplitude of the terdiurnal oscillation in the occurrence frequency of E S. A global distribution from 60°S to 60°N is given, revealing two peaks above 100 km during solstice with one maximum at low and midlatitudes (approximately 10°to 40°) in each hemisphere. During equinox, the global distribution is marked by two dominant peaks centred at midlatitudes, while an additional weak maximum is located at very low southern latitudes. The seasonal characteristics around 110 km reveal large values during equinox at low and midlatitudes (<40°N), while further peaks occur in April at >40°S and in July near 30°S. The pattern around 90 km is dominated by a broad peak between 20°and 30°S from March to September. Comparisons with the terdiurnal oscillation in the neutral atmosphere derived from zonal wind and vertical zonal wind shear simulated with a circulation model of the middle atmosphere, as well as with satellite observations of the terdiurnal tide in temperature, fit quite well for the results above 100 km, but do not show agreement for lower altitudes.

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Section: Introductionmentioning

confidence: 99%

Global distribution of the migrating terdiurnal tide seen in sporadic E occurrence frequencies obtained from GPS radio occultations

et al. 2014

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“…Higher harmonic tides, in particular the 8 h component, are discussed in several theoretical papers (e.g. Thayaparan, 1997;Taylor et al, 1999;States and Gardner, 2000;Akmaev, 2001;Younger et al, 2002;Batista et al, 2004;Smith et al, 2004;Wu et al, 2005;Beldon et al, 2006;Jacobi and Fytterer, 2012;Lilienthal et al, 2018). Generally the amplitude of the 8 h component and higher harmonics are assumed to be significantly smaller than the 24 and 12 h components.…”

Section: Discussionmentioning

confidence: 99%

“…The altitude range of accurate resonance lidar temperature measurements is limited to about 75 to 100 km due to the extent of the meteoric Fe layer (e.g. Lautenbach and Höffner, 2004;Viehl et al, 2016). Further information about the instrument has been published by Lautenbach and Höffner (2004) and Höffner and Lautenbach (2009), for example.…”

Section: Instrumentsmentioning

confidence: 99%

Thermal structure of the mesopause region during the WADIS-2 rocket campaign

et al. 2019

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Abstract. This paper presents simultaneous temperature measurements by three independent instruments during the WADIS-2 rocket campaign in northern Norway (69∘ N, 14∘ E) on 5 March 2015. Vertical profiles were measured in situ with the CONE instrument. Continuous mobile IAP Fe lidar (Fe lidar) measurements during a period of 24 h, as well as horizontally resolved temperature maps by the Utah State University (USU) Advanced Mesospheric Temperature Mapper (AMTM) in the mesopause region, are analysed. Vertical and horizontal temperature profiles by all three instruments are in good agreement. A harmonic analysis of the Fe lidar measurements shows the presence of waves with periods of 24, 12, 8, and 6 h. Strong waves with amplitudes of up to 10 K at 8 and 6 h are found. The 24 and 12 h components play only a minor role during these observations. In contrast only a few short periodic gravity waves are found. Horizontally resolved temperatures measured with the AMTM in the hydroxyl (OH) layer are used to connect the vertical temperature profiles. In the field of view of 200 km×160 km only small deviations from the horizontal mean of the order of 5 K are found. Therefore only weak gravity wave signatures occurred. This suggests horizontal structures of more than 200 km. A comparison of Fe lidar, rocket-borne measurements, and AMTM temperatures indicates an OH centroid altitude of about 85 km.

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“…In contrast to the good agreement in vertical wavelength the large amplitudes of the 8 h and 6 h waves are unexpected. Higher harmonic tides, in particular the 8 10 h component, are discussed in several, also theoretical papers (e.g., Thayaparan, 1997;Taylor et al, 1999;States and Gardner, 2000;Akmaev, 2001;Younger et al, 2002;Batista et al, 2004;Smith et al, 2004;Wu et al, 2005;Beldon et al, 2006;Jacobi and Fytterer, 2012;Lilienthal et al, 2018). Generally the amplitude of the 8 h component and higher harmonics are assumed to be significantly smaller than the 24 h and 12 h components.…”

Section: Discussionmentioning

confidence: 99%