Improved radio occultation sounding of the Arctic atmosphere using simulations with a high resolution atmospheric model / Kunitsyn V., Zakharov V., Dethloff K., Weisheimer A., Gerding M., Neuber R., Rinke A., Hebestadt I. // Physics and Chemistry of the Earth. - 2004. - V. 29, l. 2-3. - P. 277-286.

ISSN:
14747065
Type:
Article
Abstract:
Radio occultation experiments have been simulated for the Arctic region on the basis of the regional atmospheric model HIRHAM4. Irregular structures in the atmosphere produce a violation of the quasi-sphericity in the radio signal propagation and exert a strong influence on the accuracy of atmospheric profiles retrieved by the radio occultation technique. Errors in radio occultation data are spatially localised and associated with gradients in atmospheric structures. Local errors reach 2% in retrieved profiles of refractivity corresponding to an error of 6 K in temperature. Therefore mesoscale variations in atmospheric parameter gradients in a specified region must be taken into account when interpreting radio occultation data. We show, that a correction functional can be developed using the refractivity index field calculated from the regional model in order to improve the radio occultation retrieval of atmospheric parameters. This functional is constructed from instantaneous model outputs, as well as from temporally averaged fields of refractivity using data of the HIRHAM4 model for the Arctic atmosphere. The correction functional derived from monthly averaged data reduced the retrieval errors of refractivity, temperature, and pressure in the troposphere, in particular, temperature retrieval errors are reduced up to 1 K. Application of this kind of functional depends on whether the model used for the construction of the functional is able to simulate the real mesoscale atmospheric structures. © 2004 Elsevier Ltd. All rights reserved.
Author keywords:
Index keywords:
Acoustic waves; Atmospheric pressure; Atmospheric temperature; Computer simulation; Radio navigation; Refractive index; Wave propagation; Radio occultation sounding; Radio signal propagation; Troposph
DOI:
10.1016/j.pce.2004.01.012
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Affiliations M. Lomonosov Moscow State University, Moscow, Russian Federation; AlfredWegenerInst.forPolar/Mar.Res., Phys./Chem. Proc. in the Atmosphere, Telegrafenberg A43, Potsdam 14473, Germany
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Correspondence Address Neuber, R.; AlfredWegenerInst.forPolar/Mar.Res., Phys./Chem. Proc. in the Atmosphere, Telegrafenberg A43, Potsdam 14473, Germany; email: neuber@awi-potsdam.de
CODEN PCEHA
Language of Original Document English
Abbreviated Source Title Phys. Chem. Earth
Source Scopus