guest ::
| Home > Workflow collections > Publication Charges > Satellite observations of middle atmosphere–thermosphere vertical coupling by gravity waves |
| Home > Workflow collections > Publication Charges > Satellite observations of middle atmosphere–thermosphere vertical coupling by gravity waves |
| Journal Article | FZJ-2018-02206 |
; ; ; ;
2018
Copernicus
Katlenburg, Lindau
This record in other databases: 
Please use a persistent id in citations: http://hdl.handle.net/2128/19875 doi:10.5194/angeo-36-425-2018
Abstract: 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.
; 
; 
; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
PDF (PDFA)