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• W4230361014 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> <span id=page5536/>In air quality research, often only size-integrated particle mass concentrations as indicators of aerosol particles are considered. However, the mass concentrations do not provide sufficient information to convey the full story of fractionated size distribution, in which the particles of different diameters (<span class=inline-formula><i>D</i>_p</span>) are able to deposit differently on respiratory system and cause various harm. Aerosol size distribution measurements rely on a variety of techniques to classify the aerosol size and measure the size distribution. From the raw data the ambient size distribution is determined utilising a suite of inversion algorithms. However, the inversion problem is quite often ill-posed and challenging to solve. Due to the instrumental insufficiency and inversion limitations, imputation methods for fractionated particle size distribution are of great significance to fill the missing gaps or negative values. The study at hand involves a merged particle size distribution, from a scanning mobility particle sizer (NanoSMPS) and an optical particle sizer (OPS) covering the aerosol size distributions from 0.01 to 0.42 <span class=inline-formula>µm</span> (electrical mobility equivalent size) and 0.3 to 10 <span class=inline-formula>µm</span> (optical equivalent size) and meteorological parameters collected at an urban background region in Amman, Jordan, in the period of 1 August 2016–31 July 2017. We develop and evaluate feed-forward neural network (FFNN) approaches to estimate number concentrations at particular size bin with (1) meteorological parameters, (2) number concentration at other size bins and (3) both of the above as input variables. Two layers with 10–15 neurons are found to be the optimal option. Worse performance is observed at the lower edge (<span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M4 display=inline overflow=scroll dspmath=mathml><mrow><mn mathvariant=normal>0.01</mn><mo><</mo><msub><mi>D</mi><mi mathvariant=normal>p</mi></msub><mo><</mo><mn mathvariant=normal>0.02</mn></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=83pt height=14pt class=svg-formula dspmath=mathimg md5hash=0a19d858f772fceabb7358981286c2af><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-14-5535-2021-ie00001.svg width=83pt height=14pt src=amt-14-5535-2021-ie00001.png/></svg:svg></span></span> <span class=inline-formula>µm</span>), the mid-range region (<span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M6 display=inline overflow=scroll dspmath=mathml><mrow><mn mathvariant=normal>0.15</mn><mo><</mo><msub><mi>D</mi><mi mathvariant=normal>p</mi></msub><mo><</mo><mn mathvariant=normal>0.5</mn></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=77pt height=14pt class=svg-formula dspmath=mathimg md5hash=4c842197885cdc4dc6daf89731acd19e><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-14-5535-2021-ie00002.svg width=77pt height=14pt src=amt-14-5535-2021-ie00002.png/></svg:svg></span></span> <span class=inline-formula>µm</span>) and the upper edge (<span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M8 display=inline overflow=scroll dspmath=mathml><mrow><mn mathvariant=normal>6</mn><mo><</mo><msub><mi>D</mi><mi mathvariant=normal>p</mi></msub><mo><</mo><mn mathvariant=normal>10</mn></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=58pt height=14pt class=svg-formula dspmath=mathimg md5hash=a7eb375b62532835fdc23b1be88eb5ad><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-14-5535-2021-ie00003.svg width=58pt height=14pt src=amt-14-5535-2021-ie00003.png/></svg:svg></span></span> <span class=inline-formula>µm</span>). For the edges at both ends, the number of neighbouring size bins is limited, and the detection efficiency by the corresponding instruments is lower compared to the other size bins. A distinct performance drop over the overlapping mid-range region is due to the deficiency of a merging algorithm. Another plausible reason for the poorer performance for finer particles is that they are more effectively removed from the atmosphere compared to the coarser particles so that the relationships between the input variables and the small particles are more dynamic. An observable overestimation is also found in the early morning for ultrafine particles followed by a distinct underestimation before midday. In the winter, due to a possible sensor drift and interference artefacts, the estimation performance is not as good as the other seasons. The FFNN approach by meteorological parameters using 5 min data (<span class=inline-formula><i>R</i>²=</span> 0.22–0.58) shows poorer results than data with longer time resolution (<span class=inline-formula><i>R</i>²=</span> 0.66–0.77). The FFNN approach using the number concentration at the other size bins can serve as an alternative way to replace negative numbers in the size distribution raw dataset thanks to its high accuracy and reliability (<span class=inline-formula><i>R</i>²=</span> 0.97–1). This negative-number filling approach can maintain a symmetric distribution of errors and complement the existing ill-posed built-in algorithm in particle sizer instruments." @default.
• W4230361014 created "2022-05-11" @default.
• W4230361014 creator A5033926071 @default.
• W4230361014 date "2021-07-11" @default.
• W4230361014 modified "2023-10-16" @default.
• W4230361014 title "Reply on RC2" @default.
• W4230361014 doi "https://doi.org/10.5194/amt-2021-37-ac2" @default.
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