 |
| Titel |
A comprehensive observational filter for satellite infrared limb sounding of gravity waves |
| VerfasserIn |
Q. T. Trinh, S. Kalisch, P. Preusse, H.-Y. Chun, S. D. Eckermann, M. Ern, M. Riese |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 3 ; Nr. 8, no. 3 (2015-03-23), S.1491-1517 |
| Datensatznummer |
250116229
|
| Publikation (Nr.) |
 copernicus.org/amt-8-1491-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| This paper describes a comprehensive observational filter for
satellite infrared limb sounding of gravity waves. The filter
considers instrument visibility and observation geometry with a high
level of accuracy. It contains four main processes: visibility filter,
projection of the wavelength on the tangent-point track, aliasing
effect, and calculation of the observed vertical wavelength. The
observation geometries of the SABER (Sounding of the Atmosphere using
Broadband Emission Radiometry) and HIRDLS (High Resolution Dynamics
Limb Sounder) are mimicked. Gravity waves (GWs) simulated by coupling
a convective GW source (CGWS) scheme and the gravity wave regional or
global ray tracer (GROGRAT) are used as an example for applying the
observational filter. Simulated spectra in terms of horizontal and
vertical wave numbers (wavelengths) of gravity wave momentum flux
(GWMF) are analyzed under the influence of the filter. We find that
the most important processes, which have significant influence on the
spectrum are the visibility filter (for both SABER and HIRDLS observation
geometries) and aliasing for SABER and projection on tangent-point track
for HIRDLS. The vertical wavelength distribution is mainly affected by
the retrieval as part of the "visibility filter" process. In
addition, the short-horizontal-scale spectrum may be projected for
some cases into a longer horizontal wavelength interval which
originally was not populated. The filter largely reduces GWMF values
of very short horizontal wavelength waves. The implications for
interpreting observed data are discussed. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|