"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 12, 2017

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UDC 551.501.795:551.571.1

Use of information on troposphere dynamics in radiothermal remote sensing of the vertical atmospheric humidity profile


D. M. Ermakov

Fryazinio Branch of Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Vvedensky Sq.1, Fryazino Moscow region 141190, Russia 


The paper is received on December 15, 2017


Abstract. Present-day satellite multichannel microwave radiometers-imagers measure two-dimensional fields of radiothermal atmospheric radiation. Thus the existing horizontal correlations in remote data, caused by the nature of geophysical atmospheric fields, can be analyzed and taken into account in models. However, in standard schemes for retrieval of vertical profiles of atmospheric humidity, remote measurements at each point are interpreted independently, i.e. a significant part of the received information is ignored. In this paper, an extension of the classical approach to radiothermal satellite sounding of vertical atmospheric profiles is proposed by using additional information in the form of characteristics of advection (horizontal motion) in the lower troposphere. Owing to the complexity of the problem, a sufficient goal of assimilating information on troposphere dynamics is to reduce the a priori uncertainty of the vertical distribution of the humidity profile in the vicinity of horizons of 800-600 hPa. The proposed iterative algorithm is aimed at achieving this goal. Practical implementation of this algorithm requires obtaining robust estimates of the velocities of atmospheric advection of water vapor (integral over the height of the entire atmosphere and over the heights of two layers located above and below a certain horizon). The analysis of the previous research in the field, as well as the results of the implementation and practical application of algorithms of satellite radiothermovision, show that the problem is fundamentally feasible. A large-scale statistical analysis of radiosonde data, including vertical profiles of wind speed and direction, should become the initial step in its solution. The generalization of this information in the form of average values, variances and covariances of the corresponding parameters (by analogy with the statistical regularization approach) will not only provide an adequate initial approximation of the desired advection velocities, but will also allow to formulate quality criteria for rejecting unreliable estimates.

Key words: radiothermal atmospheric sounding, vertical humidity profile, troposphere dynamics.


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For citation:
M. Ermakov. Use of information on troposphere dynamics in radiothermal remote sensing of the vertical atmospheric humidity profile. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2017. No. 12. Available at http://jre.cplire.ru/jre/dec17/15/text.pdf.