Articles | Volume 38, issue 2
https://doi.org/10.5194/angeo-38-421-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-38-421-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
31 Mar 2020
Regular paper |
| 31 Mar 2020
| 31 Mar 2020
Migrating and non-migrating tides observed in the stratosphere from FORMOSAT-3/COSMIC temperature retrievals
Uma Das
CORRESPONDING AUTHOR
Indian Institute of Information Technology Kalyani, Kalyani, West Bengal, India
William E. Ward
Department of Physics, University of New Brunswick, Fredericton, Canada
Chen Jeih Pan
Institute of Space Science, National Central University, Zhongli, Taiwan
Sanat Kumar Das
Environmental Sciences Section, Bose Institute, Kolkata, India
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Subject: Terrestrial atmosphere and its relation to the sun | Keywords: Middle atmosphere dynamics
Propagating characteristics of mesospheric gravity waves observed by an OI 557.7 nm airglow all-sky camera at Mt. Bohyun (36.2° N, 128.9° E)
Modelling the residual mean meridional circulation at different stages of sudden stratospheric warming events
Stratospheric influence on the mesosphere–lower thermosphere over mid latitudes in winter observed by a Fabry–Perot interferometer
Local stratopause temperature variabilities and their embedding in the global context
Relation between the interannual variability in the stratospheric Rossby wave forcing and zonal mean fields suggesting an interhemispheric link in the stratosphere
Impact of local gravity wave forcing in the lower stratosphere on the polar vortex stability: effect of longitudinal displacement
Stratospheric observations of noctilucent clouds: a new approach in studying middle- and large-scale mesospheric dynamics
High-resolution Beijing mesosphere–stratosphere–troposphere (MST) radar detection of tropopause structure and variability over Xianghe (39.75° N, 116.96° E), China
Effect of latitudinally displaced gravity wave forcing in the lower stratosphere on the polar vortex stability
Global analysis for periodic variations in gravity wave squared amplitudes and momentum fluxes in the middle atmosphere
Notes on the correlation between sudden stratospheric warmings and solar activity
Connection between the length of day and wind measurements in the mesosphere and lower thermosphere at mid- and high latitudes
Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere
Jun-Young Hwang, Young-Sook Lee, Yong Ha Kim, Hosik Kam, Seok-Min Song, Young-Sil Kwak, and Tae-Yong Yang
Ann. Geophys., 40, 247–257, https://doi.org/10.5194/angeo-40-247-2022, https://doi.org/10.5194/angeo-40-247-2022, 2022
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We analysed all-sky camera images observed at Mt. Bohyun observatory (36.2° N, 128.9° E) for the period of 2017–2019. We retrieved gravity wave parameters including horizontal wavelength, phase velocity and period from the image data. The horizontally propagating directions of the wave were biased according to their seasons, exerted with filtering effect by prevailing background winds. We also evaluated the nature of vertical propagation of the wave for each season.
Andrey V. Koval, Wen Chen, Ksenia A. Didenko, Tatiana S. Ermakova, Nikolai M. Gavrilov, Alexander I. Pogoreltsev, Olga N. Toptunova, Ke Wei, Anna N. Yarusova, and Anton S. Zarubin
Ann. Geophys., 39, 357–368, https://doi.org/10.5194/angeo-39-357-2021, https://doi.org/10.5194/angeo-39-357-2021, 2021
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Numerical modelling is used to simulate atmospheric circulation and calculate residual mean meridional circulation (RMC) during sudden stratospheric warming (SSW) events. Calculating the RMC is used to take into account wave effects on the transport of atmospheric quantities and gas species in the meridional plane. The results show that RMC undergoes significant changes at different stages of SSW and contributes to SSW development.
Olga S. Zorkaltseva and Roman V. Vasilyev
Ann. Geophys., 39, 267–276, https://doi.org/10.5194/angeo-39-267-2021, https://doi.org/10.5194/angeo-39-267-2021, 2021
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One of the fundamental tasks of atmospheric physics is the study of the processes of vertical interaction of atmospheric layers. We carried out observations with a Fabry–Perot interferometer at an altitude of 90–100 km. We have shown that sudden stratospheric warming and active planetary waves have an impact on the dynamics of the upper atmosphere. That is, the green line airglow decreases and the temperature rises. Major warming causes the reversal of the zonal wind in the upper atmosphere.
Ronald Eixmann, Vivien Matthias, Josef Höffner, Gerd Baumgarten, and Michael Gerding
Ann. Geophys., 38, 373–383, https://doi.org/10.5194/angeo-38-373-2020, https://doi.org/10.5194/angeo-38-373-2020, 2020
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The aim of this study is to bring local variabilities into a global context. To qualitatively study the impact of global waves on local measurements in winter, we combine local lidar measurements with global MERRA-2 reanalysis data. Our results show that about 98 % of the local day-to-day variability can be explained by the variability of waves with zonal wave numbers 1, 2 and 3. Thus locally measured effects which are not based on global wave variability can be investigated much better.
Yuki Matsushita, Daiki Kado, Masashi Kohma, and Kaoru Sato
Ann. Geophys., 38, 319–329, https://doi.org/10.5194/angeo-38-319-2020, https://doi.org/10.5194/angeo-38-319-2020, 2020
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Interannual variabilities of the zonal mean wind and temperature related to the Rossby wave forcing in the winter stratosphere of the Southern Hemisphere are studied using 38-year reanalysis data. Correlation of the mean fields to the wave forcing is extended to the subtropics of the Northern Hemisphere. This interhemispheric link is caused by the wave forcing which reduces the meridional gradient of the angular momentum and drives the meridional circulation over the Equator in the stratosphere.
Nadja Samtleben, Aleš Kuchař, Petr Šácha, Petr Pišoft, and Christoph Jacobi
Ann. Geophys., 38, 95–108, https://doi.org/10.5194/angeo-38-95-2020, https://doi.org/10.5194/angeo-38-95-2020, 2020
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The additional transfer of momentum and energy induced by locally breaking gravity wave hotspots in the lower stratosphere may lead to a destabilization of the polar vortex, which is strongly dependent on the position of the hotspot. The simulations with a global circulation model show that hotspots located above Eurasia cause a total decrease in the stationary planetary wave (SPW) activity, while the impact of hotspots located in North America mostly increase the SPW activity.
Peter Dalin, Nikolay Pertsev, Vladimir Perminov, Denis Efremov, and Vitaly Romejko
Ann. Geophys., 38, 61–71, https://doi.org/10.5194/angeo-38-61-2020, https://doi.org/10.5194/angeo-38-61-2020, 2020
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A unique stratospheric balloon-borne observation of noctilucent clouds (NLCs) was performed at night on 5–6 July 2018. A sounding balloon, carrying the NLC camera, reached 20.4 km altitude. NLCs were observed from the stratosphere at large scales (100–1500 km) for the first time. Propagations of gravity waves of various scales were registered. This experiment is rather simple and can be reproduced by the broad geoscience community and amateurs, providing a new technique in NLC observations.
Feilong Chen, Gang Chen, Yufang Tian, Shaodong Zhang, Kaiming Huang, Chen Wu, and Weifan Zhang
Ann. Geophys., 37, 631–643, https://doi.org/10.5194/angeo-37-631-2019, https://doi.org/10.5194/angeo-37-631-2019, 2019
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Using the Beijing MST radar echo-power observations collected during the period November 2011–May 2017, the structure and variability of the tropopause over Xianghe, China (39.75° N, 116.96° E), was presented. Our comparison results showed a good agreement between the radar and thermal tropopauses during all seasons. In contrast, the consistency between the radar and dynamical tropopauses is poor during summer. Diurnal oscillation in tropopause height is commonly observed during all seasons.
Nadja Samtleben, Christoph Jacobi, Petr Pišoft, Petr Šácha, and Aleš Kuchař
Ann. Geophys., 37, 507–523, https://doi.org/10.5194/angeo-37-507-2019, https://doi.org/10.5194/angeo-37-507-2019, 2019
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Simulations of locally breaking gravity wave hot spots in the stratosphere show a suppression of wave propagation at midlatitudes, which is partly compensated for by additional wave propagation through the polar region. This leads to a displacement of the polar vortex towards lower latitudes. The effect is highly dependent on the position of the artificial gravity wave forcing. It is strongest (weakest) for hot spots at lower to middle latitudes (higher latitudes).
Dan Chen, Cornelia Strube, Manfred Ern, Peter Preusse, and Martin Riese
Ann. Geophys., 37, 487–506, https://doi.org/10.5194/angeo-37-487-2019, https://doi.org/10.5194/angeo-37-487-2019, 2019
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In this paper, for the first time, absolute gravity wave momentum flux (GWMF) on temporal scales from terannual variation up to solar cycle length is investigated. The systematic spectral analysis of SABER absolute GWMF is presented and physically interpreted. The various roles of filtering and oblique propagating are discussed, which is likely an important factor for MLT dynamics, and hence can be used as a stringent test bed of the reproduction of such features in global models.
Ekaterina Vorobeva
Ann. Geophys., 37, 375–380, https://doi.org/10.5194/angeo-37-375-2019, https://doi.org/10.5194/angeo-37-375-2019, 2019
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We investigated the statistical relationship between solar activity and the occurrence rate of major sudden stratospheric warmings (MSSWs). For this purpose, the 10.7 cm radio flux (F10.7) has been used as a proxy for solar activity. The calculations have been performed based on two datasets of central day (NCEP–NCAR-I and combined ERA) for the period from 1958 to 2013. The analysis revealed a positive correlation between MSSW events and solar activity.
Sven Wilhelm, Gunter Stober, Vivien Matthias, Christoph Jacobi, and Damian J. Murphy
Ann. Geophys., 37, 1–14, https://doi.org/10.5194/angeo-37-1-2019, https://doi.org/10.5194/angeo-37-1-2019, 2019
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This study shows that the mesospheric winds are affected by an expansion–shrinking of the mesosphere and lower thermosphere that takes place due to changes in the intensity of the solar radiation, which affects the density within the atmosphere. On seasonal timescales, an increase in the neutral density occurs together with a decrease in the eastward-directed zonal wind. Further, even after removing the seasonal and the 11-year solar cycle variations, we show a connection between them.
J. Federico Conte, Jorge L. Chau, Fazlul I. Laskar, Gunter Stober, Hauke Schmidt, and Peter Brown
Ann. Geophys., 36, 999–1008, https://doi.org/10.5194/angeo-36-999-2018, https://doi.org/10.5194/angeo-36-999-2018, 2018
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Based on comparisons of meteor radar measurements with HAMMONIA model simulations, we show that the differences exhibited by the semidiurnal solar tide (S2) observed at middle and high latitudes of the Northern Hemisphere between equinox times are mainly due to distinct behaviors of the migrating semidiurnal (SW2) and the non-migrating westward-propagating wave number 1 semidiurnal (SW1) tidal components.
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Short summary
Temperatures obtained from FORMOSAT-3 and COSMIC observations in the stratosphere are analysed for tidal variations. It is seen that non-migrating tides are not very significant in the high-latitude winter stratosphere. It is shown that the observed amplitudes of these tides in earlier studies are most probably a result of aliasing and are not geophysical in nature. Thus, the process of non-linear interactions through which it was believed that they are produced seems to be unimportant.
Temperatures obtained from FORMOSAT-3 and COSMIC observations in the stratosphere are analysed...
