Ground-based microwave thermal sounding of the atmosphere

Mukhin

Skalyga

et al. 2009

We propose a method for recovery of the altitude profile of the stratosphere temperature using ground-based radiometric measurements. The method is based on the Bayesian approach to solving inverse problems and involves determining the probability distribution for the temperature in the entire range of the sounded altitudes. In this case, we use some assumptions on noise in the experimental data and available a priori information about the recovered profile. Using the proposed approach, we compare the recovery results for two methods of approximation and regularization of the recovered profile. It is shown that using the ground-based observations of solar radiation in the oxygen absorption line 27 − , it is possible to recover the temperature profile in the altitude range 20-55 km.

“…In this paper, we use the transition line 27 − with the center frequency 53.066907 GHz as optimal for the ground-based thermal sensing [11][12][13].…”

Section: Bayesian Approach To Solving An Ill-posed Inverse Problem Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bayesian approach to recovery of the vertical profile of the stratosphere temperature from the ground-based measurements of solar radiation in millimeter absorption lines of molecular oxygen

Mukhin

Skalyga

et al. 2009

“…The optical thickness of the Earth's atmosphere from the sea level is very large in these lines, which leads to their significant overlapping and formation of a continuous band. Using this fact, the systems of thermal sensing of the atmospheric nearsurface layer, which are based on the dependence of the emission penetration depth on the zenith angle, are realized at the band center [1]. Similar systems can also be realized at frequencies 118.75 GHz near the line center.…”

Section: Introductionmentioning

confidence: 98%

Microwave spectroradiometer complex for remote study of the stratosphere thermal structure

Швецов

Demkin

et al. 2009

We describe a microwave spectroradiometer for thermal sensing of the stratosphere in the molecular oxygen lines located on the slope of a 5-mm band. An uncooled low-noise high-frequency amplifier ensures the device noise temperature 1400 K. The frequency resolution of the used filtering analyzer varies from 0.5 MHz at the center of the line to 15 MHz at its boundary. The through calibration of the spectroradiometer is performed by an electrically controlled noise generator on the basis of the Schottky-barrier diode. The accuracy of the temperature recovery in the altitude range 20-55 km is estimated from the results of surface measurements of the atmospheric emission in the line with a central frequency of 53.0669 GHz. Model calculations based on the Bayesian approach show that the temperature-recovery accuracy no worse than 10 K for the confidence interval 95% can be achieved during an observation period of about half an hour.

“…Note that the above range was used for the ground-based thermal sensing of the atmosphere prior to the satellite sensing. The problem of the ground-based measurements of the atmospheric temperature by this method has almost been solved for the lower atmospheric layers (up to the altitudes 7-10 km) [1][2][3]. Although the potential of the ground-based remote sensing of the middle atmosphere has been discussed for a sufficiently long time [2,4,5], the ground-based thermal diagnostics of the middle atmosphere has not been realized for some hardware and software reasons, which are thoroughly discussed in [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…The problem of the ground-based measurements of the atmospheric temperature by this method has almost been solved for the lower atmospheric layers (up to the altitudes 7-10 km) [1][2][3]. Although the potential of the ground-based remote sensing of the middle atmosphere has been discussed for a sufficiently long time [2,4,5], the ground-based thermal diagnostics of the middle atmosphere has not been realized for some hardware and software reasons, which are thoroughly discussed in [2,5]. In recent years, a method for recovery of the altitude profile of the middle-atmosphere temperature has been developed at the Institute of Applied Physics of the Russian Academy of Sciences (Nizhny Novgorod, Russia) on the basis of the results of the ground-based observation of emission in the lines at the slope of the absorption band [6,7], and a facility for such sensing has been manufactured.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the middle-atmosphere temperature profile using a ground-based spectroradiometer facility

Швецов

Fedoseev

et al. 2010