Wintertime vertical distribution of black carbon and single scattering albedo in a semi-arid region derived from tethered balloon observations

Guan, Xu; Zhang, Naiyue; Tian, Pengfei; Tang, Chenguang; Zhang, Zhida; Wang, Ligong; Yunshu, Zhang; Zhang, Min; Guo, Yumin; Du, Tao; Cao, Xin; Liang, Jiening; Zhang, Lei

doi:10.1016/j.scitotenv.2021.150790

Cited by 16 publications

(11 citation statements)

References 49 publications

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“…8 . Relatively low SSA in P1 indicated strong aerosol absorption in Lanzhou ( Tian et al, 2018a ; Guan et al, 2021 , 2022 ). Generally, lower aerosol scattering/absorption coefficient corresponded to higher O 3 while higher SSA related to higher O 3 both in P1 and P2.…”

Section: Resultsmentioning

confidence: 99%

Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region

Du²,

Song³

et al. 2022

Atmospheric Environment

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Section: Resultsmentioning

confidence: 99%

Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region

Du²,

Song³

et al. 2022

Atmospheric Environment

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“…Liu et al, 2021). The results of the tethered balloon observations at SACOL also indicated that at 14:00 above the boundary layer, the vertical gradient of the particle number concentration was larger than that of eBC above the ABL at that observational time, suggesting that eBC was more easily mixed in the vertical direction (Guan et al, 2022). In summary, the decreasing SSA trend above the ABL was caused by a faster decrease in scattering aerosols than in absorbing aerosols.…”

Section: Vertical Heating Rate and Direct Radiative Forcing Of Aeroso...mentioning

confidence: 82%

“…However, absorbing aerosols, represented by BC, are light and stable and can be transported more efficiently to high altitudes above the boundary layer than scattering aerosols, resulting in a lower SSA above the boundary layer (D. Liu, Ding, et al., 2020; D. Liu, Hu, et al., 2020; Q. Liu et al., 2021). The results of the tethered balloon observations at SACOL also indicated that at 14:00 above the boundary layer, the vertical gradient of the particle number concentration was larger than that of eBC above the ABL at that observational time, suggesting that eBC was more easily mixed in the vertical direction (Guan et al., 2022). In summary, the decreasing SSA trend above the ABL was caused by a faster decrease in scattering aerosols than in absorbing aerosols.…”

Section: Resultsmentioning

confidence: 98%

More Accurate Quantification of Direct Aerosol Radiative Effects Using Vertical Profiles of Single‐Scattering Albedo Derived From Tethered Balloon Observations

Guan,

Tian,

Wang

et al. 2024

JGR Atmospheres

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Aerosol single‐scattering albedo (SSA) is the most critical factor for the accurately calculating of aerosol radiative effects, however, the observation of vertical profiles of SSA is difficult to realize. Current assessments of aerosol radiative effects remain uncertain because of the lack of long‐term, high‐resolution vertical profiles of SSA observations. High‐resolution SSA vertical profiles were observed in a semi‐arid region of Northwest China during winter using a tethered balloon. The observed SSA vertical profiles were used to calculate the aerosol direct radiative forcing and radiative heating rates. Significant differences in the calculated radiative forcing were found (e.g., a 48.3% relative difference for the heating effect in the atmosphere at 14:00) between the observed SSA profiles and the constant assumption with SSA = 0.90. Diurnal variations in the vertical distribution of SSA decisively influenced direct radiative forcing of aerosols. Furthermore, high‐resolution vertical profiles of absorbing aerosols and meteorological parameters provide robust observational evidence of the heating effect of an elevated absorbing aerosol layer. This study provides a more accurate calculation of aerosol radiative forcing using observed aerosol SSA profiles.

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“…is a rural site in the Chinese Loess Plateau, representing the background in the semi‐arid region of northwest China (Figure S1 in Supporting Information ) (Huang et al., 2008). The SACOL site suffers from anthropogenic aerosol pollution (e.g., BC and BrC), which is most severe during the winter (Guan et al., 2022; Tang et al., 2022). The dust aerosols emitted from desert sources, such as the Taklamakan and Gobi deserts, are frequently transported to the SACOL site during the spring and winter (Tian et al., 2015).…”

Section: Methodsmentioning

confidence: 99%

A New Method for Eliminating Dust Effects When Quantifying the Light Absorption Properties of Brown Carbon

Tang,

Tian,

Zhang

et al. 2024

Geophysical Research Letters

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Accurate quantification of the absorption properties of brown carbon (BrC) aerosols is crucial to assess the Earth‐atmosphere radiative impacts of BrC. However, the BrC absorption properties were often misestimated in field observations, due to neglecting the contribution of dust absorption. This study solved this problem by coupling a method for calculating the dust concentration into the traditional model for quantifying BrC absorption. The results show that dust absorption was up to 16.8% of the sum of BrC and dust absorption in northwestern China. The potential contribution of dust to the sum of BrC and dust absorption was significantly higher in the Asia‐located studies (0.4%–16.8%) than in the Americas‐located (<1.2%) and Europe‐located (<2.3%) studies. This work underscores the necessity of eliminating the negative effect of dust in BrC quantitative model. It prompts us to revisit the BrC absorption properties resolved by previous studies, especially in dust‐influenced areas such as Asia.

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Wintertime vertical distribution of black carbon and single scattering albedo in a semi-arid region derived from tethered balloon observations

Cited by 16 publications

References 49 publications

Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region

Changes in physical and chemical properties of urban atmospheric aerosols and ozone during the COVID-19 lockdown in a semi-arid region

More Accurate Quantification of Direct Aerosol Radiative Effects Using Vertical Profiles of Single‐Scattering Albedo Derived From Tethered Balloon Observations

A New Method for Eliminating Dust Effects When Quantifying the Light Absorption Properties of Brown Carbon

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