Universität zu Köln

Myagkov, Alexander and Ori, Davide ORCID: 0000-0002-9964-2200 (2022). Analytic characterization of random errors in spectral dual-polarized cloud radar observations. Atmos. Meas. Tech., 15 (5). S. 1333 - 1355. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1867-8548

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Abstract

This study presents the first-ever complete characterization of random errors in dual-polarimetric spectral observations of meteorological targets by cloud radars. The characterization is given by means of mathematical equations for joint probability density functions (PDFs) and error covariance matrices. The derived equations are checked for consistency using real radar measurements. One of the main conclusions of the study is that the convenient representation of spectral polarimetric measurements including differential reflectivity Z(DR), correlation coefficient rho(HV), and differential phase Phi(DP) is not suited for the proper characterization of the error covariance matrix. This is because the aforementioned quantities are complex, non-linear functions of the radar raw data, and thus their error covariance matrix is commonly derived using simplified linear relations and by neglecting the correlation of errors. This study formulates the spectral polarimetric measurements in terms of a different set of quantities that allows for a proper analytic treatment of their error covariance matrix. The results given in this study allow for utilization of spectral polarimetric measurements for advanced meteorological applications, among which are variational retrieval techniques, data assimilation, and sensitivity analysis.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Myagkov, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Ori, Davide UNSPECIFIED orcid.org/0000-0002-9964-2200 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-661982
DOI:	10.5194/amt-15-1333-2022
Journal or Publication Title:	Atmos. Meas. Tech.
Volume:	15
Number:	5
Page Range:	S. 1333 - 1355
Date:	2022
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1867-8548
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RAINDROP SIZE DISTRIBUTION; W-BAND RADAR; DOPPLER SPECTRA; DEPOLARIZATION RATIOS; ICE CRYSTALS; RETRIEVAL; SYSTEM; SHAPE; DISTRIBUTIONS; EVENT Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66198