Cross-validation of two liquid water path retrieval algorithms applied to ground-based microwave radiation measurements by RPG-HATPRO instrument
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1 Cross-validation of two liquid water path retrieval algorithms applied to ground-based microwave radiation measurements by RPG-HATPRO instrument V.S.Kostsov*, D.V.Ionov, E.Yu.Biryukov, N.A.Zaitsev St. Petersburg State University (Department of Atmospheric Physics, Faculty of Physics, Research Center GEOMODEL) Russia, St. Petersburg-Petrodvorets, Ulyanovskaya 1, *
2 RPG-HATPRO microwave radiometer at St.Petersburg University observational site
3 T b (14 channels zenith observational mode) PHA (physical algorithm, Inversion of the radiative transfer equation) REA (regressional algorithm, quadratic regression) Products: temperature profile humidity profile integrated water vapor IWV cloud liquid water path (LWP)
4 Considered problems: validation of of obtained LWP values; error assessment including bias estimation; retrieval quality assessment and spurious data rejection.? Is Is it it possible to to work out reliable criteria of of the quality of of LWP retrievals for a standalone 14-channel microwave radiometer on the basis of of the comparison of of the LWP values obtained by two different and independent retrieval algorithms?
5 Data ensembles 1 December November 2014 Warm and humid period (May-November) Cold and dry period (December-April) WH1 WH2 CD1 CD2 PHA / REA PHA / REA PHA / REA PHA / REA
6 1-hour mean value of LWP b as a function of corresponding 1-hour rms variation of LWP σ for PHA (left) and REA (right). Data ensemble WH1. Red crosses designate the presence of synchronous FTIR measurements. The bias of PHA (left) and REA (right) as a function of time. Every data point corresponds to 1-hour cloud free period identified from the results of PHA.
7 The estimations of bias b and random error σ for LWP retrievals taken from different sources Reference b (kg m -2 ) σ (kg m -2 ) or (%) This study, PHA This study, REA Matzler and Morland (2009) Cossu et al. (2015) for ensemble WH for ensemble CD1 Highly variable at low liquid water contents for both ensembles at low liquid water contents for both ensembles % for LWP>0.1 kg m -2
8 The scatter plot of LWP values obtained by PHA and REA for the ensembles WH1 (left) and CD1 (right). The histogram plot of LWP values obtained by PHA and REA for the ensembles WH1 (left) and CD1 (right).
9 The time chart of the input and output data before and after the moment of sudden change of the LWP retrieval bias (between the 8th and 114th seconds as counted from the moment 4 Sep :59:50 UTC). Top: LWP values retrieved by PHA and REA. Middle: integrated water vapor retrieved by PHA and REA and the retrieval quality flag F of PHA. Bottom: brightness temperature values in 7 socalled humidity channels (frequencies are given near the curves).
10 ? Data quality control problem before and after rain event?
11 The rms difference d between the LWP values obtained by PHA and REA as a function of time t passed since the end of a rain: 1 the WH2 ensemble, 2 the CD2 ensemble. Line 3 shows the rms difference for non-rainy conditions. Line 4 is the extrapolation of the data obtained for the WH2 ensemble. The quality factor of PHA fq as a function of time t passed since the end of a rain: 1 for the WH2 ensemble, 2 for the CD2 ensemble. Lines 3 and 4 present the linear extrapolation of the data obtained for the WH2 and the CD2 ensembles correspondingly.
12 Data quality assessment, 2 Aug 2013, rainy day 1 LWP rms diff. 2 quality factor f q 3 rain flag f r 4 LWP rms diff. for nonrainy conditions
13 Main conclusion Now we can answer the main question that has been put in the present study: Yes, it it is is possible to work out a reliable criteria of the quality of LWP retrievals for a standalone 14-channel microwave radiometer on the basis of the comparison of the LWP values obtained by two different and independent retrieval algorithms! Acknowledgements The operation of the RPG-HATPRO instrument was provided by the Research Center GEOMODEL of St. Petersburg State University ( Funding Measurements and data processing were supported by Russian Science Foundation through the project No Data analysis was supported by Russian Foundation for Basic Research through the projects No and No
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