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| Hauptseite > Workflowsammlungen > Publikationsgebühren > Satellite observations of middle atmosphere–thermosphere vertical coupling by gravity waves > print |
| Hauptseite > Workflowsammlungen > Publikationsgebühren > Satellite observations of middle atmosphere–thermosphere vertical coupling by gravity waves > print |
| 001 | 844855 | ||
| 005 | 20240712100853.0 | ||
| 024 | 7 | _ | |a 10.5194/angeo-36-425-2018 |2 doi |
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| 024 | 7 | _ | |a 1432-0576 |2 ISSN |
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| 100 | 1 | _ | |a Trinh, Quang Thai |0 P:(DE-Juel1)151304 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Satellite observations of middle atmosphere–thermosphere vertical coupling by gravity waves |
| 260 | _ | _ | |a Katlenburg, Lindau |c 2018 |b Copernicus |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Atmospheric gravity waves (GWs) are essentialfor the dynamics of the middle atmosphere. Recent stud-ies have shown that these waves are also important for thethermosphere/ionosphere (T/I) system. Via vertical coupling,GWs can significantly influence the mean state of the T/Isystem. However, the penetration of GWs into the T/I sys-tem is not fully understood in modeling as well as obser-vations. In the current study, we analyze the correlation be-tween GW momentum fluxes observed in the middle atmo-sphere (30–90 km) and GW-induced perturbations in the T/I.In the middle atmosphere, GW momentum fluxes are derivedfrom temperature observations of the Sounding of the At-mosphere using Broadband Emission Radiometry (SABER)satellite instrument. In the T/I, GW-induced perturbations arederived from neutral density measured by instruments on theGravity field and Ocean Circulation Explorer (GOCE) andCHAllenging Minisatellite Payload (CHAMP) satellites. Wefind generally positive correlations between horizontal dis-tributions at low altitudes (i.e., below 90 km) and horizontaldistributions of GW-induced density fluctuations in the T/I(at 200 km and above). Two coupling mechanisms are likelyresponsible for these positive correlations: (1) fast GWs gen-erated in the troposphere and lower stratosphere can propa-gate directly to the T/I and (2) primary GWs with their ori-gins in the lower atmosphere dissipate while propagating up-wards and generate secondary GWs, which then penetrateup to the T/I and maintain the spatial patterns of GW dis-tributions in the lower atmosphere. The mountain-wave re-lated hotspot over the Andes and Antarctic Peninsula is foundclearly in observations of all instruments used in our analy-sis. Latitude–longitude variations in the summer midlatitudesare also found in observations of all instruments. These vari-ations and strong positive correlations in the summer midlat-itudes suggest that GWs with origins related to convectionalso propagate up to the T/I. Different processes which likelyinfluence the vertical coupling are GW dissipation, possiblegeneration of secondary GWs, and horizontal propagation ofGWs. Limitations of the observations as well as of our re-search approach are discussed. |
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| 700 | 1 | _ | |a Ern, Manfred |0 P:(DE-Juel1)129117 |b 1 |
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| 700 | 1 | _ | |a Riese, Martin |0 P:(DE-Juel1)129145 |b 4 |u fzj |
| 773 | _ | _ | |a 10.5194/angeo-36-425-2018 |g Vol. 36, no. 2, p. 425 - 444 |0 PERI:(DE-600)1458425-6 |n 2 |p 425 - 444 |t Annales geophysicae |v 36 |y 2018 |x 1432-0576 |
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