Semi-empirical model of middle atmosphere wind from the ground to the lower thermosphere

Jacobi, Ch.; Fröhlich, Kristina; Portnyagin, Yu. I.; Merzlyakov, E. G.; Solovjova, T.V.; Makarov, N. M.; Rees, D.; Fahrutdinova, A.; Gur’yanov, V. V.; Fedorov, D. V.; Korotyshkin, D.; Forbes, Jeffrey M.; Pogoreltsev, Alexander; Kürschner, D.

doi:10.1016/j.asr.2008.05.011

Cited by 28 publications

(19 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structure of the zonal circulation presented in Fig. 1 and respective temperature fields calculated with the MUAM correspond quite well to the existing empirical standard models (e.g., Jacobi et al 2009). …”

Section: Resultssupporting

confidence: 58%

Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphere

et al. 2015

View full text Add to dashboard Cite

Recently developed parameterization of stationary orographic gravity waves (OGWs) generated by the Earth's topography was implemented into a general circulation model of the middle and upper atmosphere. We performed numerical simulations of the zonal mean wind and amplitudes of stationary planetary waves and normal atmospheric modes with periods of 4-16 days at altitudes from the troposphere to the lower thermosphere in January for easterly and westerly phases of the quasi-biennial oscillation (QBO) including and excluding the stationary OGW parameterization. Simulations show that accounting dynamical and thermal effects of stationary OGWs can lead to substantial changes (up to 50-90 %) in the amplitudes of stationary planetary waves. Amplitudes of westward travelling normal atmospheric modes change (up to 50-90 %) at different altitudes and latitudes of the northern hemisphere due to OGW effects. Transitions from the easterly to westerly QBO phases can change planetary wave amplitudes up to ±30-90 % at middle and high latitudes. These changes in PW amplitudes are consistent with distributions of EP-flux and refractive index under different QBO phases simulated including our parameterization of stationary OGWs.

show abstract

Section: Resultssupporting

confidence: 58%

Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphere

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The mean derived zonal winds (Table 1) generally agrees with the climatological wind magnitude (À30 m/s to À10 m/s) documented in the previous studies [e.g., Swinbank and Ortland, 2003;Portnyagin et al, 2004aPortnyagin et al, , 2004bJacobi et al, 2009], but these studies suggested that in August the easterly is slightly weakened rather than strengthened. However, the falling sphere climatology at 69°N and 80 km altitude shown by Müllemann and Lübken [2004] does indicate mean zonal winds strengthened from~À45 m/s in July tõ À50 m/s in mid-August, whereas the weakening of easterly began in the second half of August.…”

Section: Journal Ofmentioning

confidence: 99%

Horizontal winds derived from the polar mesospheric cloud images as observed by the CIPS instrument on the AIM satellite

et al. 2015

View full text Add to dashboard Cite

A cloud pattern matching technique is applied to polar mesospheric cloud (PMC) images taken by the Cloud Imaging and Particle Size instrument (CIPS) to infer the wind velocities in the mesopause region. CIPS measurements are analyzed to detect patterns that repeat from one orbit to the next but are displaced in location; the displacement provides a measure of the wind velocity. Pattern matching is achieved by resampling the CIPS data to longitude and latitude grids with the grid-box size forced at~5 km in both directions. The correlated patterns are searched within a geographic region referred to as a "frame" of 500 km in longitude × 400 km in latitude. The histograms of the derived velocities indicate that easterly winds prevail, with a mean zonal wind of À20 to À15 m/s. Mean meridional winds are overall small, but in late summer the histogram indicated a poleward wind of~20-30 m/s. The variability of CIPS cloud albedo on consecutive orbits is also examined at fixed geolocations. The statistical results suggest that~86% of pairs underwent mean cloud albedo variation of < 50% on consecutive orbits, suggesting a moderate change. It is also found that the correlation of the cloud structures between two consecutive orbits at a fixed location is generally poor. These findings suggest that cloud patterns are subject to wind advection, but the cloud patches are more extended in size than the movement that occurs. Cloud voids are found to be more likely to remain at the same geolocations.

show abstract

“…Jacobi). The assimilated fields employ UKMO data from 0–55 km, Global Empirical Wind Model data [ Portnyagin et al , 2004] from 70–100 km, and numerical model results from 55–70 km [see Jacobi et al , 2009].…”

Section: Monthly Mean and Composite‐day Winds Tides And Gw Momentummentioning

confidence: 99%

Southern Argentina Agile Meteor Radar: Initial assessment of gravity wave momentum fluxes

2010

View full text Add to dashboard Cite

[1] The Southern Argentina Agile Meteor Radar (SAAMER) was installed on Tierra del Fuego (53.8°S) in May 2008 and has been operational since that time. This paper describes tests of the SAAMER ability to measure gravity wave momentum fluxes and applications of this capability during different seasons. Test results for specified mean, tidal, and gravity wavefields, including tidal amplitudes and gravity wave momentum fluxes varying strongly with altitude and/or time, suggest that the distribution of meteors throughout the diurnal cycle and averaged over a month allows characterization of both monthly mean profiles and diurnal variations of the gravity wave momentum fluxes. Applications of the same methods for real data suggest confidence in the monthly mean profiles and the composite day diurnal variations of gravity wave momentum fluxes at altitudes where meteor counts are sufficient to yield good statistical fits to the data. Monthly mean zonal winds and gravity wave momentum fluxes exhibit anticorrelations consistent with those seen at other midlatitude and high-latitude radars during austral spring and summer, when no strong local gravity wave sources are apparent. When stratospheric variances are significantly enhanced over the Drake Passage "hot spot" during austral winter, however, MLT winds and momentum fluxes over SAAMER exhibit very different correlations that suggest that MLT dynamics are strongly influenced by strong local gravity wave sources within this "hot spot." SAAMER measurements of mean zonal and meridional winds at these times and their differences from measurements at a conjugate site provide further support for the unusual momentum flux measurements.

show abstract

Semi-empirical model of middle atmosphere wind from the ground to the lower thermosphere

Cited by 28 publications

References 29 publications

Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphere

Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphere

Horizontal winds derived from the polar mesospheric cloud images as observed by the CIPS instrument on the AIM satellite

Southern Argentina Agile Meteor Radar: Initial assessment of gravity wave momentum fluxes

Contact Info

Product

Resources

About