High Contribution of Secondary Brown Carbon to Aerosol Light Absorption in the Southeastern Margin of Tibetan Plateau

Wang, Qiyuan; Han, Yongming; Ye, Jianhuai; Liu, Suixin; Pongpiachan, Siwatt; Zhang, Ningning; Han, Yuemei; Tian, Jie; Wu, Cheng; Long, Xinping; Zhang, Qian; Zhang, Wenyan; Zhao, Zi-Long; Cao, Junji

doi:10.1029/2019gl082731

Cited by 96 publications

(88 citation statements)

References 83 publications

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“…S4). A slope of 2.3 was regarded as the correction factor and was comparable to the values of 2.0-2.6 reported by previous studies using a similar method (Qin et al, 2018;Tasoglou et al, 2017;Wang et al, 2019b). This difference may mainly be related to the matrix scattering and lensing effects.…”

Section: Overview Of Abs(λ)supporting

confidence: 77%

“…Additionally, the MAC BrC,biomass (λ) was several times to 2 orders of magnitude lower than MAC BC (λ) from different sources, suggesting that BC had a stronger ability to absorb light compared to BrC. Notably, the MAC BrC (λ) obtained in this study was within the range reported by previous investigations, although with differences among studies (Wang et al, 2019b;Cho et al, 2019). The differences in MAC BrC (λ) may partly be related to biomass types and their burning efficiencies as well as the aging processes of BrC in the atmosphere.…”

Section: Source-dependent Optical Properties Of Lac Aerosolssupporting

confidence: 71%

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Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions

et al. 2020

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Abstract. Source-specific optical properties of light-absorbing carbonaceous (LAC) aerosols in the atmosphere are poorly understood because they are generated by various sources. In this study, a receptor model combining multi-wavelength absorption and chemical species was used to explore the source-specific optical properties of LAC aerosols in a tropical marine monsoon climate zone. The results showed that biomass burning and ship emissions were the dominant contributors to average aerosol light absorption. The source-specific absorption Ångström exponent (AAE) indicated that black carbon (BC) was the dominant LAC aerosol in ship and motor vehicle emissions. Moreover, brown carbon (BrC) was present in biomass-burning emissions. The source-specific mass absorption cross section (MAC) showed that BC from ship emissions had a stronger light-absorbing capacity compared to emissions from biomass burning and motor vehicles. The BrC MAC derived from biomass burning was also smaller than the BC MAC and was highly dependent on wavelength. Furthermore, radiative effect assessment indicated a comparable atmospheric forcing and heating capacity of LAC aerosols between biomass burning and ship emissions. This study provides insights into the optical properties of LAC aerosols from various sources. It also sheds more light on the radiative effects of LAC aerosols generated by ship emissions.

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Section: Overview Of Abs(λ)supporting

confidence: 77%

Section: Source-dependent Optical Properties Of Lac Aerosolssupporting

confidence: 71%

Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions

et al. 2020

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“…for each day, which were computed using the NOAA HYSPLIT4 model, and the clusters analysis results, as shown in Figure S1b, showed that during the sampling periods, air masses transported mainly from the west and southwest (mainly in the northeast part of Burma and the Sino-Burmese border) to Gaomeigu accounted for 65.6% and 39.7% of all of the trajectories, respectively, and only 5% of the air masses transported from the east (inner China). This indicates the important influence of Southeast Asia, where intensive burning activities or natural forest fires occur frequently during the premonsoon season [16,49]. In addition, there were two significant build-ups for different atmospheric pollutant periods-from 22 to 26 March (Period 1: five days, with a PM 2.5 average of 34.67 µg m −3 ) and 25 to 27 April (Period 2: three days, with a PM 2.5 average of 40.61 µg m −3 ).…”

Section: Concentration-weighted Trajectory (Cwt) Analysismentioning

confidence: 99%

Characteristics of PM2.5 at a High-Altitude Remote Site in the Southeastern Margin of the Tibetan Plateau in Premonsoon Season

Zhao

Wang

et al. 2019

Atmosphere

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The Tibetan Plateau (TP) is one of the world's most sensitive areas for climate change. Previous studies have revealed that air pollutants emitted from South and Southeast Asia can be transported to and have a negative impact on the TP. However, the majority of the investigators have focused on the pollutant transport processes from South Asian regions (i.e., India and Bangladesh) and parts of Southeast Asia, while the regions adjacent to the southeast fringe of the TP (i.e., Burma and the Sino-Burmese border) have been neglected. Here, fine particulate matter (PM 2.5 ) samples were collected during the period 11 March to 13 May 2018 at Gaomeigu, a high-altitude remote site in the southeastern margin of the TP. Characteristics, sources of PM 2.5 , and the potential source regions for different chemical components were investigated. During the sampling time, PM 2.5 mass loadings ranged from 3.79 to 54.57 µg m −3 , with an arithmetic mean concentration of 20.99 ± 9.80 µg m −3 . In general, major peaks of organic carbon (OC) and elemental carbon (EC) always coincided with high loadings of K + and NO 3 − , which implies that common combustion sources caused these species' concentrations to covary, while the daily variations of crustal elements showed different trends with the other chemical compositions, suggesting different source regions for crustal materials. Five source factors were identified as possible aerosol sources for PM 2.5 by positive matrix factorization (PMF). They are the mining industry (5.3%), characterized by heavy metal elements; secondary formation (18.8%), described by the high concentrations of NH 4 + and SO 4 2− ; traffic-related emissions (26.7%), dominated by carbonaceous species (especially soot-EC) and some metal elements; fugitive dust (15.2%), represented by crustal elements (Ti, Fe, and Mn), Ca 2+ , and Mg 2+ ; and biomass burning (34.0%), which is typified by high concentrations of K + , NO 3 − , char-EC, primary OC, and secondary OC. The concentration-weighted trajectory (CWT) analysis results showed that the northeast part of Burma is the potential source region for high concentrations of EC and NO 3 − due to biomass burning emissions, while the tourism industry surrounding Gaomeigu gave strong grid cell values of SO 4 2− as well as moderate values of EC and NO 3 − . Moreover, the mining industry in the southwest direction of Gaomeigu has important impacts on the zinc concentrations.

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“…A BC-tracer method was utilized to separate Abssec(λ) from Abspri(λ) (Wang et al, 2019a). Thus, the Eq.…”

Section: Segregation Of Bc and Brc Absorptionmentioning

confidence: 99%

“…1%' ratio was determined with a minimum R-squared (MRS) method, which is described in detail in Wang et al (2019a).…”

Section: Segregation Of Bc and Brc Absorptionmentioning

confidence: 99%

Optical source apportionment and radiative forcing of light-absorbing carbonaceous aerosol at a tropical marine monsoon climate zone: the importance of ship emissions

Wang¹,

Liu²,

Wang³

et al. 2020

Preprint

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Abstract. Source-specific optical properties of light-absorbing carbonaceous (LAC) aerosol are poorly understood owing to its various sources in the atmosphere. Here, a receptor model coupling multi-wavelength absorption with chemical species was utilized to explore the source-specific LAC optical properties at a tropical marine monsoon climate zone. Results showed that biomass burning contributed the largest to LAC absorption on average, but ship emissions became the dominant contributor (44–45 %) when the air masses originated from the South China Sea. The source-specific absorption Ångström exponent indicates that black carbon (BC) was the dominant LAC aerosol in ship and motor vehicle emissions while there was also brown carbon (BrC) existed in biomass-burning emissions. The source-specific mass absorption cross section (MAC) showed that BC from ship emissions had a stronger light-absorbing capacity than biomass burning and motor vehicle emissions. The BrC MAC derived from biomass burning was smaller than BC MAC and highly depended on wavelengths. Radiative effect assessment indicates a comparable atmospheric forcing and heating capacity of LAC aerosol from biomass burning and ship emissions. Our study provides insights into the optical properties of LAC aerosol from various sources and can improve our understanding of the LAC radiative effects caused by ship emissions.

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High Contribution of Secondary Brown Carbon to Aerosol Light Absorption in the Southeastern Margin of Tibetan Plateau

Cited by 96 publications

References 83 publications

Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions

Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions

Characteristics of PM2.5 at a High-Altitude Remote Site in the Southeastern Margin of the Tibetan Plateau in Premonsoon Season

Optical source apportionment and radiative forcing of light-absorbing carbonaceous aerosol at a tropical marine monsoon climate zone: the importance of ship emissions

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