Ols couldn’t be ignored. 3.4. Liquid/Solid Source Analysis and Implications for Brown Carbon With spectral EBC concentration differences, Equations (8)ten) might be utilized to divide EBC Esflurbiprofen Inhibitor concentrations into liquid sources (for instance gasoline) and strong sources (for instance coal). Within this study, daily average liquid and strong EBC concentrations have been calculated. Every single day is categorized as a liquid day (liquid source dominates) or a strong day (strong source dominates), as shown in Figure six. For the whole investigation period, liquid supply days accounted for 70 , suggesting that EBCs in Xuzhou mainly derived from liquid fuel combustion. In the course of the nonheating season, liquid source days accounted for 77 . Seventytwo percent of heating days had been solid source days, suggesting that the coal combustion for heating on nowadays largely changed the supply of EBC.Atmosphere 2021, 12, 1314 Atmosphere 2021, 12, x FOR PEER REVIEWof 8 of817Figure 4.4. Correlation analysis of equivalent black carbon and atmospheric pollutants. Figure Correlation evaluation of equivalent black carbon and atmospheric pollutants.In this paper, (EBC370) is measured EBC concentrations at 370 nm Table 1. Pearson correlation coefficient of multichannel EBC and atmospheric pollutants. band, and (EBC880)7-wavelength EBC EBC370 EBC470 EBC520 EBC590 EBC660 EBC880 EBCis the corresponding worth at 880 nm band. (EBC370) should theoretically be higher than PM2.five PM10 NO2 O3 (EBC880), as brown carbon aerosol is moreSO2 absorbing at shorter. According to this characteristic, (EBC370)/(EBC880) can indicate the seasonal influence of brown carbon to a particular 0.451 0.572 0.524 0.208 0.383 -0.191 extent [25]. The distinction in Sorbinil medchemexpress between (EBC370)/(EBC880) 0.388 heating season nonfor the and 0.482 0.577 0.530 0.217 -0.194 in the course of 0.487 heating season in Xuzhou0.527 the analysis period is shown in 0.574 0.214 0.385 Table two. The average worth -0.195 for the heating season is 1.106, and also the average worth for the 0.383 nonheating season is 1.071. This 0.489 0.571 0.522 0.211 -0.197 of brown carbon0.209 through the heating season-0.197 in EBC is drastically 0.490 shows that the proportion0.520 0.568 0.380 greater than that during the nonheating season, as well as the maximum value and regular de0.491 0.561 0.512 0.202 0.376 -0.200 0.489 viation with the 0.555 heating season are considerably higher than those the nonheating season, 0.507 0.197 0.373 for -0.200 indicating that brown carbon aerosols the amount of = 0.01 (two-sided). Note: signifies that the correlation is significant at constitute a bigger proportion during the heating season but are unstable. three.three. Correlation between Multichannel EBC and Atmospheric PollutantsCOduring the nonheating period, but there isn’t any considerable difference inside the lowest worth. Taking 880 nm as an example, the average distinction involving heating and nonheating seasons is around 1.32 103 ng/m . There have been also spectral differences in between the heating and nonheating seasons, and the distinction was biggest at 370 nm (1.79 103 Atmosphere 2021, 12, 1314 ng/m ) and progressively decreased to 1.31 103 ng/m at 950 nm, suggesting that brown carbon aerosols couldn’t be ignored.9 ofFigure five. EBC concentrations in seven throughout the heating heating season, season, and season, and Figure5. EBC concentrations in seven bandsbands in the course of theseason, nonheating nonheatingentire year. The line within the box is the whole year. median mass concentration for every season. T.
