Ols could not be ignored. 3.four. Liquid/Solid Supply Analysis and Implications for Brown Carbon With spectral EBC concentration differences, Equations (eight)10) could possibly be utilized to divide EBC concentrations into liquid sources (for example gasoline) and solid sources (such as coal). In this study, daily average liquid and solid EBC concentrations have been calculated. Every single day is categorized as a liquid day (liquid supply dominates) or even a strong day (strong source dominates), as shown in Figure 6. For the whole research period, liquid supply days accounted for 70 , suggesting that EBCs in Xuzhou mostly derived from liquid fuel combustion. For the duration of the nonheating season, liquid source days accounted for 77 . Seventytwo percent of heating days were solid source days, suggesting that the coal combustion for heating on these days largely changed the source of EBC.Atmosphere 2021, 12, 1314 Atmosphere 2021, 12, x FOR PEER REVIEWof 8 of817Figure four.4. Correlation evaluation 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 value at 880 nm band. (EBC370) really should theoretically be greater than PM2.five PM10 NO2 O3 (EBC880), as brown carbon aerosol is moreSO2 absorbing at shorter. Based on 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 difference among (EBC370)/(EBC880) 0.388 heating season nonfor the and 0.482 0.577 0.530 0.217 -0.194 during 0.487 heating season in Xuzhou0.527 the research period is shown in 0.574 0.214 0.385 Table 2. The average value -0.195 for the heating season is 1.106, as well as the average value for the 0.383 nonheating season is 1.071. This 0.489 0.571 0.522 0.211 -0.197 of brown carbon0.209 in the course of the heating season-0.197 in EBC is substantially 0.490 shows that the proportion0.520 0.568 0.380 larger than that during the nonheating season, and also the maximum value and normal de0.491 0.561 0.512 0.202 0.376 -0.200 0.489 viation with the 0.555 heating season are significantly greater than these the nonheating season, 0.507 0.197 0.373 for -0.200 indicating that brown carbon aerosols the degree of = 0.01 (Azamethiphos medchemexpress two-sided). Note: indicates that the correlation is substantial at constitute a bigger proportion through the heating season but are unstable. three.3. Correlation in Cy5-DBCO MedChemExpress between Multichannel EBC and Atmospheric PollutantsCOduring the nonheating period, but there isn’t any significant difference in the lowest value. Taking 880 nm as an example, the typical difference between heating and nonheating seasons is roughly 1.32 103 ng/m . There were also spectral differences between the heating and nonheating seasons, along with the difference 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 could not be ignored.9 ofFigure 5. EBC concentrations in seven in the course of the heating heating season, season, and season, and Figure5. EBC concentrations in seven bandsbands throughout theseason, nonheating nonheatingentire year. The line in the box may be the whole year. median mass concentration for every season. T.
