ORCID Profile
0000-0001-6559-6544
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Atmospheric Sciences Not Elsewhere Classified | Mathematical Physics | Atmospheric Sciences | Ionospheric And Magnetospheric Physics | Meteorology | Physical Sciences Not Elsewhere Classified | Instruments And Techniques | Petroleum and Coal Geology | Dynamical Systems | Astronomical and Space Sciences | Pure Mathematics | Environmental Science and Management | Turbulent Flows | Optical Physics Not Elsewhere Classified | Climate Change Processes | Surfacewater Hydrology | Other Physical Sciences | Other Electronic Engineering | Environmental Monitoring | Theoretical Physics | Thermodynamics And Statistical Physics
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Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-4606
Abstract: We present the migrating tidal winds decomposed jointly from multiple meteor radars in four longitudinal sectors situated in the equatorial mesosphere and lower thermosphere. The radars are located in Cariri, Brazil (7.4& #176 S, 36.5& #176 W), Kototabang, Indonesia (0.2& #176 S, 100.3& #176 E), Ascension Island, United Kingdom (7.9& #176 S, 14.4& #176 W), and Darwin, Australia (12.3& #176 S, 130.8& #176 E). Harmonic analysis was used to obtain litudes and phases for diurnal and semidiurnal solar migrating tides between 82 and 98 km altitude during the period 2005& #8211 . To verify the reliability of the tidal components calculated by the four meteor radar wind measurements, we also present a similar analysis for the Whole Atmosphere Community Climate Model winds, which suggests that the migrating tides are well observed by the four different radars. The tides include the important tidal components of diurnal westward-propagating zonal wavenumber 1 and semidiurnal westward-propagating zonal wavenumber 2. In addition, the results based on observations were compared with the Climatological Tidal Model of the Thermosphere (CTMT). In general, in terms of climatic features, our results for the major components of migrating tides are qualitatively consistent with the CTMT models derived from satellite data. In addition, the tidal litudes are unusually stronger in January& #8211 February 2006. This result is probably because tides were enhanced by the 2006 Northern Hemisphere stratospheric sudden warming event.
Publisher: American Geophysical Union (AGU)
Date: 04-1998
DOI: 10.1029/98JD00482
Publisher: American Geophysical Union (AGU)
Date: 12-2008
DOI: 10.1029/2008JA013668
Publisher: Elsevier BV
Date: 02-2006
Publisher: Elsevier BV
Date: 05-2002
Publisher: American Geophysical Union (AGU)
Date: 08-2004
DOI: 10.1029/2004GL020352
Publisher: Elsevier BV
Date: 12-2007
Publisher: Elsevier BV
Date: 10-2014
Publisher: American Geophysical Union (AGU)
Date: 11-1996
DOI: 10.1029/96RS02028
Publisher: American Geophysical Union (AGU)
Date: 03-1996
DOI: 10.1029/95JD03826
Publisher: American Geophysical Union (AGU)
Date: 24-07-2015
DOI: 10.1002/2015GL065066
Publisher: IEEE
Date: 2003
Publisher: American Geophysical Union (AGU)
Date: 11-1997
DOI: 10.1029/96JD03145
Publisher: Elsevier BV
Date: 02-2006
Publisher: American Geophysical Union (AGU)
Date: 25-08-2010
DOI: 10.1029/2009JD013772
Publisher: American Geophysical Union (AGU)
Date: 22-08-2014
DOI: 10.1002/2014JD021787
Publisher: American Geophysical Union (AGU)
Date: 27-04-2012
DOI: 10.1029/2011JD016865
Publisher: Copernicus GmbH
Date: 04-02-2021
DOI: 10.5194/ACP-2021-33
Abstract: Abstract. We present a study of migrating and non-migrating tidal winds observed simultaneously by three meteor radars situated in the southern equatorial region. The radars are located at Cariri (7.4° S, 36.5° W), Brazil, Kototabang (0.2° S, 100.3° E), Indonesia and Darwin (12.3° S, 130.8° E), Australia. Harmonic analysis was used to obtain litudes and phases for diurnal and semidiurnal solar migrating and non-migrating tides between 80 and 100 km altitude during the period 2005 to 2008. They include the important tidal components of diurnal westward-propagating zonal wavenumber 1 (DW1), diurnal eastward-propagating zonal wavenumber 3 (DE3), semidiurnal westward-propagating zonal wavenumber 2 (SW2), and semidiurnal eastward-propagating zonal wavenumber 2 (SE2). In addition, we also present a climatology of these wind tides and analyze the reliability of the fitting through the reference to Whole Atmosphere Community Climate Model (WACCM) winds. The analysis suggests that the migrating tides could be well fitted by the three different radars, but the non-migrating tides might be overestimated. The results based on observations were also compared with the Climatological Tidal Model of the Thermosphere (CTMT). In general, climatic features between observations and model migrating tides were satisfactory in both wind components. However, the features of the DW1, DE3 and SW2 litudes in both wind components were slightly different from the results of the CTMT models. This result is probably because tides could be enhanced by the 2006 northern hemisphere stratospheric sudden warming (NH-SSW) event.
Publisher: American Geophysical Union (AGU)
Date: 11-1998
DOI: 10.1029/1998JD200001
Publisher: American Geophysical Union (AGU)
Date: 07-11-2019
DOI: 10.1029/2019JD030735
Publisher: Elsevier BV
Date: 05-2002
Publisher: Springer Science and Business Media LLC
Date: 21-05-2018
Publisher: American Geophysical Union (AGU)
Date: 07-08-2022
DOI: 10.1029/2022JD036558
Abstract: Twenty six years of medium frequency (MF) radar wind measurements made from 1994 to 2019 at Davis Station (68.6°S, 77.9°E) are used to study the mean response of the mesosphere‐lower thermosphere to stratospheric warmings in the Southern Hemisphere. Warming events were detected using Modern‐Era Retrospective Analysis for Research and Applications (MERRA2) data with a systematic search for reductions in the zonal‐mean circulation at 60°S and corresponding increases in polar temperatures. Some 37 events were identified, including the 2002 major warming and the large event of 2019, with an average of 1–2 warmings per year. At the 10 hPa level, the polar cap temperature increases ranged from 3 to 28 K, with a mean value of 12 K, while the zonal wind speed reductions varied between −6 and −43 ms −1 , with a mean value of −15 ms −1 . Peak values occurred near 40 km. Warmings occurred mainly between August and October, with a small peak in occurrence in April/May. The MF radar data showed an average reduction in the mesospheric eastward winds of about 5–7 ms −1 at heights near 75 km that occurred 3–4 days prior to the changes in the stratosphere. Warming events were driven by episodic intensifications in planetary wave litudes, with quasi‐stationary planetary scale waves (PW) 1 being especially important. PW Eliassen‐Palm flux ergences show a systematic behavior with time and height that is consistent with a poleward residual circulation and downwelling over the pole prior to the warming events and an equatorward flow and upwelling after the peak of the events.
Publisher: Elsevier BV
Date: 03-2018
Publisher: American Geophysical Union (AGU)
Date: 27-10-2004
DOI: 10.1029/2004JD004697
Publisher: American Meteorological Society
Date: 04-2001
Publisher: Elsevier BV
Date: 10-1987
Publisher: Wiley
Date: 04-1998
Publisher: American Geophysical Union (AGU)
Date: 25-06-2013
DOI: 10.1002/JGRD.50372
Publisher: Oxford University Press (OUP)
Date: 30-07-2012
Publisher: American Meteorological Society
Date: 2004
Publisher: American Geophysical Union (AGU)
Date: 10-2012
DOI: 10.1029/2012JA017850
Publisher: Wiley
Date: 07-02-2022
Publisher: Elsevier BV
Date: 11-2002
Publisher: American Geophysical Union (AGU)
Date: 05-2009
DOI: 10.1029/2008GL037064
Publisher: Informa UK Limited
Date: 24-05-2018
Publisher: American Geophysical Union (AGU)
Date: 12-12-2006
DOI: 10.1029/2005JD006803
Publisher: Elsevier BV
Date: 12-2002
Publisher: American Geophysical Union (AGU)
Date: 10-11-2014
DOI: 10.1002/2014JD022448
Publisher: American Geophysical Union (AGU)
Date: 10-2005
DOI: 10.1029/2004RS003055
Publisher: Copernicus GmbH
Date: 06-06-2019
Abstract: Abstract. The existing distribution of meteor radars located from high- to low-latitude regions provides a favorable temporal and spatial coverage for investigating the climatology of the global mesopause density. In this study, we report the climatology of the mesopause relative density estimated using multiyear observations from nine meteor radars, namely, the Davis Station (68.6∘ S, 77.9∘ E), Svalbard (78.3∘ N, 16∘ E) and Tromsø (69.6∘ N, 19.2∘ E) meteor radars located at high latitudes the Mohe (53.5∘ N, 122.3∘ E), Beijing (40.3∘ N, 116.2∘ E), Mengcheng (33.4∘ N, 116.6∘ E) and Wuhan (30.5∘ N, 114.6∘ E) meteor radars located in the midlatitudes and the Kunming (25.6∘ N, 103.8∘ E) and Darwin (12.3∘ S, 130.8∘ E) meteor radars located at low latitudes. The daily mean relative density was estimated using ambipolar diffusion coefficients derived from the meteor radars and temperatures from the Microwave Limb Sounder (MLS) on board the Aura satellite. The seasonal variations in the Davis Station meteor radar relative densities in the southern polar mesopause are mainly dominated by an annual oscillation (AO). The mesopause relative densities observed by the Svalbard and Tromsø meteor radars at high latitudes and the Mohe and Beijing meteor radars at high midlatitudes in the Northern Hemisphere show mainly an AO and a relatively weak semiannual oscillation (SAO). The mesopause relative densities observed by the Mengcheng and Wuhan meteor radars at lower midlatitudes and the Kunming and Darwin meteor radars at low latitudes show mainly an AO. The SAO is evident in the Northern Hemisphere, especially at high latitudes, and its largest litude, which is detected at the Tromsø meteor radar, is comparable to the AO litudes. These observations indicate that the mesopause relative densities over the southern and northern high latitudes exhibit a clear seasonal asymmetry. The maxima of the yearly variations in the mesopause relative densities display a clear latitudinal variation across the spring equinox as the latitude decreases these latitudinal variation characteristics may be related to latitudinal changes influenced by gravity wave forcing. In addition to an AO, the mesopause relative densities over low latitudes also clearly show an intraseasonal variation with a periodicity of 30–60 d.
Publisher: Elsevier BV
Date: 12-2002
Publisher: American Geophysical Union (AGU)
Date: 03-1997
DOI: 10.1029/97GL00128
Publisher: American Geophysical Union (AGU)
Date: 03-2013
DOI: 10.1002/RDS.20026
Publisher: Elsevier BV
Date: 05-2002
Publisher: American Geophysical Union (AGU)
Date: 25-06-1970
DOI: 10.1029/2002JD002500
Publisher: American Geophysical Union (AGU)
Date: 11-03-2015
DOI: 10.1002/2014JD022016
Publisher: American Geophysical Union (AGU)
Date: 22-04-2003
DOI: 10.1029/2002JD003077
Publisher: American Geophysical Union (AGU)
Date: 22-02-2021
DOI: 10.1029/2020GL089957
Abstract: We report an analysis of the response of tides in neutral atmospheric mesospheric winds to recurrent geomagnetic activity in 2005 over Antarctica. The mesospheric winds were observed by the Davis meteor and medium frequency radars (68.5°S, 77.9°E magnetic latitude, 74.6°S). The zonal component of the daily prevailing winds showed a westward increase as the geomagnetic activity increased, while the meridional prevailing winds did not show a clear response. The semidiurnal tides responded greatly to geomagnetic activity, with significant increases in litude. The zonal and meridional semidiurnal tides both showed a clear upward propagating phase but responded differently to geomagnetic activity. The litude of the meridional component of the diurnal tides increased significantly, while the zonal diurnal tidal litude showed no apparent change. These results indicate that geomagnetic activity can significantly influence mesospheric dynamics.
Publisher: American Geophysical Union (AGU)
Date: 20-10-1993
DOI: 10.1029/93JD01861
Publisher: American Geophysical Union (AGU)
Date: 07-2010
DOI: 10.1029/2010GL044086
Publisher: American Geophysical Union (AGU)
Date: 18-06-2019
DOI: 10.1029/2018JD029728
Publisher: American Geophysical Union (AGU)
Date: 14-09-2004
DOI: 10.1029/2004JD004961
Publisher: Copernicus GmbH
Date: 15-11-2018
Abstract: Abstract. The existing distribution of meteor radars located from high- to low-latitude regions provides a favourable temporal and spatial coverage for investigating the climatology of the global mesopause density. In this study, we report the climatology of the mesopause density estimated using multiyear observations from nine meteor radars, namely, the Davis Station (68.6° S, 77.9° E), Svalbard (78.3° N, 16° E) and Tromsø (69.6° N, 19.2° E) meteor radars located at high latitudes, the Mohe (53.5° N, 122.3° E), Beijing (40.3° N, 116.2° E), Mengcheng (33.4° N, 116.6° E) and Wuhan (30.5° N, 114.6° E) meteor radars located in the mid-latitudes, and the Kunming (25.6° N, 103.8° E) and Darwin (12.3° S, 130.8° E) meteor radars located at low latitudes. The daily mean density was estimated using ambipolar diffusion coefficients derived from the meteor radars and temperatures from the Microwave Limb Sounder (MLS) on board the Aura satellite. The seasonal variations in the Davis Station meteor radar densities in the southern polar mesopause are mainly dominated by an annual oscillation (AO). The mesopause densities observed by the Svalbard and Tromsø meteor radars at high latitudes and the Mohe and Beijing meteor radars at high mid-latitudes in the Northern Hemisphere show mainly an AO and a relatively weak semiannual oscillation (SAO). The mesopause densities observed by the Mengcheng and Wuhan meteor radars at lower mid-latitudes and the Kunming and Darwin meteor radars at low latitudes show mainly an AO. The SAO is evident in the Northern Hemisphere, especially at high latitudes, and its largest litude, which is detected at the Tromsø meteor radar, is comparable to the AO litudes. These observations indicate that the mesopause densities over the southern and northern high latitudes exhibit a clear seasonal asymmetry. The maxima of the yearly variations in the mesopause densities display a clear temporal variation across the spring equinox as the latitude decreases these latitudinal variation characteristics may be related to latitudinal changes influenced by gravity wave forcing. In addition to an AO, the mesopause densities over low latitudes also clearly show a variation with a periodicity of 30–60 days related to the Madden-Julian oscillation in the subtropical troposphere.
Publisher: Elsevier BV
Date: 1999
Publisher: American Geophysical Union (AGU)
Date: 05-2006
DOI: 10.1029/2005JA011443
Publisher: Elsevier BV
Date: 04-1999
Publisher: American Geophysical Union (AGU)
Date: 11-1997
DOI: 10.1029/96JD03966
Publisher: American Geophysical Union (AGU)
Date: 1998
DOI: 10.1029/97GL03399
Publisher: American Geophysical Union (AGU)
Date: 06-11-2004
DOI: 10.1029/2003JD003378
Publisher: American Geophysical Union (AGU)
Date: 26-08-2008
DOI: 10.1029/2008JD009907
Publisher: American Geophysical Union (AGU)
Date: 07-1998
DOI: 10.1029/98RS00828
Publisher: Oxford University Press (OUP)
Date: 09-2009
Publisher: American Meteorological Society
Date: 05-1983
Publisher: Elsevier BV
Date: 2005
Publisher: Elsevier BV
Date: 2004
Publisher: Elsevier BV
Date: 2005
Publisher: American Geophysical Union (AGU)
Date: 08-2008
DOI: 10.1029/2008GL033763
Publisher: American Geophysical Union (AGU)
Date: 11-08-2004
DOI: 10.1029/2004JD004714
Publisher: American Geophysical Union (AGU)
Date: 04-1996
DOI: 10.1029/95JD03578
Publisher: SPIE
Date: 30-09-1994
DOI: 10.1117/12.187600
Publisher: American Geophysical Union (AGU)
Date: 30-11-2022
DOI: 10.1029/2022JA030678
Abstract: We present the migrating tidal winds decomposed jointly from multiple meteor radars in four longitudinal sectors situated in the equatorial mesosphere and lower thermosphere. The radars are located in Cariri, Brazil (7.4°S, 36.5°W), Kototabang, Indonesia (0.2°S, 100.3°E), Ascension Island, United Kingdom (7.9° S, 14.4° W), and Darwin, Australia (12.3°S, 130.8°E). Harmonic analysis was used to obtain litudes and phases for diurnal and semidiurnal solar migrating tides between 82 and 98 km altitude during the period 2005–2008. To verify the reliability of the tidal components calculated by the four meteor radar wind measurements, we also present a similar analysis for the Whole Atmosphere Community Climate Model winds, which suggests that the migrating tides are well observed by the four different radars. The tides include the important tidal components of diurnal westward‐propagating zonal wavenumber 1 and semidiurnal westward‐propagating zonal wavenumber 2. In addition, the results based on observations were compared with the Climatological Tidal Model of the Thermosphere (CTMT). In general, in terms of climatic features, our results for the major components of migrating tides are qualitatively consistent with the CTMT models derived from satellite data. In addition, the tidal litudes are unusually stronger in January–February 2006. This result is probably because tides were enhanced by the 2006 Northern Hemisphere stratospheric sudden warming event.
Publisher: American Geophysical Union (AGU)
Date: 24-10-2003
DOI: 10.1029/2002JD003349
Start Date: 02-2003
End Date: 02-2006
Amount: $147,099.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2014
End Date: 12-2019
Amount: $457,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2005
End Date: 12-2008
Amount: $72,444.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2010
End Date: 12-2013
Amount: $440,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2008
End Date: 12-2012
Amount: $515,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 12-2011
Amount: $450,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2003
End Date: 12-2004
Amount: $10,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2003
End Date: 12-2005
Amount: $252,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2005
End Date: 12-2008
Amount: $413,782.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2004
End Date: 06-2009
Amount: $1,500,000.00
Funder: Australian Research Council
View Funded Activity