| Full text | |
| Author(s): |
Andrioli, V. F.
[1]
;
Batista, P. P.
[1]
;
Clemesha, B. R.
[1]
;
Schuch, N. J.
[2]
;
Buriti, R. A.
[3]
Total Authors: 5
|
| Affiliation: | [1] Inst Nacl Pesquisas Espaciais, BR-12201 Sao Jose Dos Campos, SP - Brazil
[2] Ctr Reg Sul Pesquisas Espaciais, Santa Maria, RS - Brazil
[3] Univ Fed Campina Grande, Campina Grande, PB - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Annales Geophysicae; v. 33, n. 9, p. 1183-1193, 2015. |
| Web of Science Citations: | 6 |
| Abstract | |
We have applied a modified composite day analysis to the Hocking (2005) technique to study gravity wave (GW) momentum fluxes in the mesosphere and lower thermosphere (MLT). Wind measurements from almost continuous meteor radar observations during June 2004-December 2008 over Sao Joao do Cariri (Cariri; 7A degrees S, 36A degrees W), April 1999-November 2008 over Cachoeira Paulista (CP; 23A degrees S, 45A degrees W), and February 2005-December 2009 over Santa Maria (SM; 30A degrees S, 54A degrees W) were used to estimate the GW momentum fluxes and variances in the MLT region. Our analysis can provide monthly mean altitude profiles of vertical fluxes of horizontal momentum for short-period (less than 2-3 h) GWs. The averages for each month throughout the entire data series have shown different behavior for the momentum fluxes depending on latitude and component. The meridional component has almost the same behavior at the three sites, being positive (northward), for most part of the year. On the other hand, the zonal component shows different behavior at each location: it is positive for almost half the year at Cariri and SM but predominantly negative over CP. Annual variation in the GW momentum fluxes is present at all sites in the zonal component and also in SM at 89 km in the meridional component. The seasonal analysis has also shown a 4-month oscillation at 92.5 km over SM in the zonal component and over CP at the same altitudes but for the meridional component. (AU) | |
| FAPESP's process: | 12/08769-9 - Study of Gravity Waves In The Mesosphere Lower Thermosphere Region Using Meteor Radar, Lidar and All-Sky CCD Imagers |
| Grantee: | Vânia Fátima Andrioli Novaes Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |