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Prediction of daytime variations of HO2 radical concentrations in the marine boundary layer using BP network

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Abstract

A Back-Propagation Neural Network (BPNN) was established to predict the daytime variations of HO2 radical concentration observed in the field campaign RISFEX 2003 (RIShiri Fall Experiment 2003) conducted in September 2003 at Rishiri Island (45.07 N, 141.12 E, and 35m asl) in the Sea of Japan. The initial weight matrices and bias vectors for the network were optimized by a bee evolutionary genetic algorithm (BEGA). It was found that the input variables sensitive to HO2 variation were photolysis frequency of O3 to O(1D) (J(O1D)), a composite parameter defined as the ratio of HC to NO x reactivity towards OH radicals (Φ), and the total aerosol surface area (A). The predicted results are closely correlated with the experimental data with the coefficient of determination (R 2) close to 1. In addition, the means and ranges of the predicted HO2 concentration agree with the observed data with the correlation coefficient (R), the index of agreement (IA) and the fractional bias (FB) in the range of 0.84–0.93, 0.88–0.95 and −14%–7%, respectively. This study demonstrates that BPNN is a potential tool to predict the daytime variations of HO2 radical concentrations in the marine boundary layer (MBL).

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Authors and Affiliations

  1. Key laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; School of Chemistry and Material Science, Shaanxi Normal University, Xi’an, 710062, China

    ZhuQing Wang, Chen YaShao, Bin Qi & Bing Yang

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  1. ZhuQing Wang
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  2. Chen YaShao
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  3. Bin Qi
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  4. Bing Yang
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Correspondence to Bin Qi.

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Wang, Z., YaShao, C., Qi, B. et al. Prediction of daytime variations of HO2 radical concentrations in the marine boundary layer using BP network. Sci. China Chem. 53, 2616–2621 (2010). https://doi.org/10.1007/s11426-010-4131-8

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  • DOI: https://doi.org/10.1007/s11426-010-4131-8

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