 |
| Titel |
Tomographic retrieval approach for mesoscale gravity wave observations by the PREMIER Infrared Limb-Sounder |
| VerfasserIn |
J. Ungermann, L. Hoffmann, P. Preusse, M. Kaufmann, M. Riese |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 2 ; Nr. 3, no. 2 (2010-03-10), S.339-354 |
| Datensatznummer |
250000968
|
| Publikation (Nr.) |
 copernicus.org/amt-3-339-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| PREMIER is one of three candidates for ESA's 7th Earth Explorer mission that
are currently undergoing feasibility studies. The main mission objective of
PREMIER is to quantify processes controlling atmospheric composition in the
mid/upper troposphere and lower stratosphere, a region of particular
importance for climate change. To achieve this objective, PREMIER will employ
the first satellite Fourier transform infrared limb-imager with a 2-D detector
array combined with a millimetre-wave limb-sounder. The infrared limb-imager
can be operated in a high spatial resolution mode ("dynamics mode") for
observations of small-scale structures in atmospheric temperatures and trace
gas fields with unprecedented 3-D sampling (0.5 km in the vertical direction,
50 km along track, 25 km across track). In this paper, a fast tomographic
retrieval scheme is presented, which is designed to fully exploit the
high-resolution radiance observations of the dynamics mode. Based on a
detailed analysis of the "observational filter", we show that the dynamics
mode provides unique information on global distributions of gravity waves
(GW). The achievable vertical resolution for GW observations has values
between the vertical sampling (0.5 km) of the dynamics mode and the vertical
field of view (about 0.75 km). The horizontal across track resolution
corresponds to the horizontal across track sampling of 25 km. Since the
achievable along track horizontal resolution is about 70 km, the dynamics
mode will provide GW limb-observations with a horizontal resolution comparable
to nadir sounders. Compared to previous observations, PREMIER will therefore
considerably extend the range of detectable GWs in terms of horizontal and
vertical wavelength. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|