Abstract
Abstract. 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.
Highlights
Numerous previous satellite missions have used the infrared limb-emission sounding technique for atmospheric remote sensing
We performed various non-linear end-to-end simulations using simulated measurements of the PREMIER IRLS with different input atmospheres consisting of a cloudless climatological background atmosphere with modulated wave perturbations
We determined the gravity wave (GW) observational filter that shows the amplitude with which a given wave perturbation is reproduced by our tomographic retrieval setup
Summary
Numerous previous satellite missions have used the infrared limb-emission sounding technique for atmospheric remote sensing. Global observation of atmospheric infrared limbemissions represents a reliable technique to obtain vertically resolved profile data of temperature, a variety of trace gases, aerosols, and clouds simultaneously, at daytime and at nighttime. All previous instruments have used telescopes with scanning mirrors or one-dimensional detector arrays to obtain profile information of atmospheric trace species While these previous instruments were rather restricted in terms of spatial resolution (and in particular horizontal sampling), the PREMIER mission (Process Exploration through Measurements of Infrared and millimetre-wave Emitted Radiation) (ESA, 2008) employs an InfraRed Limb-Sounder (hereafter IRLS) that builds on recent developments in infrared detector array technology providing the basis for an instrument capable of achieving the high three-dimensional (3-D) spatial resolution.
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