Mass absorption efficiency of light absorbing organic aerosols from source region of paddy-residue burning emissions in the Indo-Gangetic Plain

Bikkina, Srinivas; Rastogi, Neeraj; Sarin, M.M.; Singh, Atinderpal; Singh, Darshan

doi:10.1016/j.atmosenv.2015.07.017

Cited by 129 publications

(89 citation statements)

References 65 publications

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“…At Kanpur, AAE of BrC varied from 2.9 to 5.8 (3.9 ± 0.6). The previous studies have reported that AAE value averages at 5.3 ± 2.0 and 6.0 ± 1.1 from upwind IGP (Patiala) and downwind IGP (Kharagpur), respectively (Srinivas and Sarin 2014;Srinivas et al 2016). From another upwind location in IGP (New Delhi), a study reported similar AAE value of 5.1 ± 2.0 (Kirillova et al 2014).…”

Section: Temporal Variability In Mass Concentration and Absorption Prsupporting

confidence: 48%

“…Using replicate measurements (n = 5), uncertainty in the assessment of MAE due to BrC has been found to be ± 8%. The previous studies from IGP, attributing biomass burning emission as the dominant source of BrC, have reported a quite similar value of MAE centering at 1.3 ± 0.5 m 2 g -1 in Patiala (upwind IGP) and 0.8 ± 0.2 m 2 g -1 in Kharagpur (downwind IGP) (Srinivas and Sarin 2014;Srinivas et al 2016). A study at New Delhi (Kirillova et al 2014) (another location in upwind IGP) reported MAE of 1.6 ± 0.5 m 2 g -1 .…”

Section: Temporal Variability In Mass Concentration and Absorption Prmentioning

confidence: 56%

“…1a, b, respectively). The previous studies (Srinivas and Sarin 2014;Srinivas et al 2016) have reported b abs-365 of BrC averaging at 52 ± 27 and 11 ± 5 Mm -1 from an upwind (Patiala) and a downwind location (Kharagpur) in IGP, respectively, during winter months (December-February). Another study (Singh et al 2014) has documented the b abs of EC throughout the entire dry season (October 08-May 09) from upwind IGP location at Patiala.…”

Section: Temporal Variability In Mass Concentration and Absorption Prmentioning

confidence: 99%

“…EC with respect to EC has been assessed. Relative radiative forcing has been determined across the solar absorption spectrum using an approach suggested previously (Kirillova et al 2014;Srinivas et al 2016). The light attenuation due to absorption by BrC, EC and BrC ?…”

Section: Implication To Atmospheric Direct Radiative Forcingmentioning

confidence: 99%

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Synergistic effect in absorption properties of brown carbon and elemental carbon over IGP during weak south-west monsoon

et al. 2017

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Recent ground-based measurements reveal that model-based observations are underestimating absorption properties and direct radiative forcing (DRF) due to carbonaceous species by a factor of 2-3 over South and East Asia. Thus, to better constraint these parameters associated with carbonaceous species, seasonal variability records through ground-based measurements are very essential. In this context, we report herein the absorption properties of water-extractable brown carbon (BrC), elemental carbon (EC), and BrC ? EC and DRF of BrC and BrC ? EC (relative to EC) over the Indo-Gangetic Plain (IGP) during a weak monsoon season [July-September 2015; influenced by El Niño and PDO (Pacific Decadal Oscillation)]. PM 2.5 (particulate matter with aerodynamic diameter B 2.5 lm) samples (n = 31) have been assessed from central IGP location at Kanpur. Absorption coefficient at 365 nm (b abs-365 ) of BrC, EC, and BrC ? EC centers at 3.6, 8.1, and 11.4 Mm -1 , respectively. Strong linear regression correlation (R = 0.8) of b abs-365 of BrC with sea-salt and mineral dust corrected potassium (K þ BB ) indicates biomass burning as the predominant source of BrC over the region in this study. Synergistic effect in b abs of BrC ? EC (relative to that of EC) increases conspicuously (enhanced by a factor varying from 1.05 to 1.21) with an increase in wavelength from UV (365 nm) to visible region (660 nm). DRF (relative to EC) of BrC during monsoon season ranges from 3.9 to 23.8 (13.0 ± 5.0) %, whereas total DRF (BrC ? EC) ranges from 111.0 to 148.2 (126.6 ± 10.0) %. Individual contribution of BrC and EC to total DRF has been estimated as 10 and 79.5%, respectively. The remaining contribution (10.5%) to total DRF has been attributed to synergism in absorption properties (i.e., b abs ) of BrC ? EC.

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Section: Temporal Variability In Mass Concentration and Absorption Prsupporting

confidence: 48%

Section: Temporal Variability In Mass Concentration and Absorption Prmentioning

confidence: 56%

Section: Temporal Variability In Mass Concentration and Absorption Prmentioning

confidence: 99%

Section: Implication To Atmospheric Direct Radiative Forcingmentioning

confidence: 99%

See 2 more Smart Citations

Synergistic effect in absorption properties of brown carbon and elemental carbon over IGP during weak south-west monsoon

et al. 2017

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“…Further, these emissions get transported to the Bay of Bengal and Arabian Sea through the IGP and thus, affect regional air quality and marine atmospheric chemistry (Rastogi and Sarin, 2008;Sarin et al, 2010;Kaskaoutis et al, 2014). There are a few studies in literatures which have reported the chemical characteristics of PM 2.5 from the northwest part of India (Rajput et al, 2011;Rastogi et al, 2014;Rajput et al, 2014;Rastogi et al, 2016;Srinivas et al, 2016); however, the study on size-segregated chemical composition of carbonaceous aerosols over northwestern part of the IGP is still lacking in literature. Size distribution of aerosols is a strong indicator in understanding their primary and secondary sources and atmospheric formation process.…”

Section: Introductionmentioning

confidence: 96%

Size-Segregated Characteristics of Carbonaceous Aerosols over the Northwestern Indo-Gangetic Plain: Year Round Temporal Behavior

Singh

Rastogi

Patel

et al. 2016

Aerosol Air Qual. Res.

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Size-segregated aerosol samples (PM <0.95 , PM 0.95-1.5 , PM 1.5-3.0 , PM 3.0-7.2 and PM >7.2 ) were collected over Patiala (30.33°N, 76.40°E; 250 m amsl), a semi-urban city located in northwestern Indo-Gangetic Plain (IGP) during October, 2012 to September, 2013. These samples were analyzed for carbonaceous aerosols (organic carbon (OC), elemental carbon (EC) and water-soluble organic carbon (WSOC)) to study their temporal variation, prevailing emission source (s) and secondary formation processes. Annual average of total suspended particulates (TSP) concentration, estimated by adding the aerosol concentrations in different size ranges, was found to be 199 ± 82 µg m -3 , varying from 88-387 µg m -3 with majority of particulate mass found in submicron size (PM <0.95 ). ), respectively over an annual cycle. Highest mass fraction of OC (> 75%) and WSOC (> 80%) was observed in submicron size, suggesting that OC mainly comes from combustion and/or secondary source (s). It has been observed that almost half of OC is secondary. On the other hand, climate forcing agent EC in PM <0.95 varied from 1.1 to 9.8 µg m -3 (4.8 ± 2.2 µg m -3 ). High mass ratios of OC/EC (~1.5-7.2) and WSOC/OC (~0.33-0.68) indicate the relative dominance of biomass burning emission over the study region. Total carbonaceous aerosols account for ~10-59% of submicron particulates mass (PM <0.95 ), indicating that fine particulates are enriched with carbonaceous species. These results have implications to regional climate model development and validation.

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Light absorption properties of brown carbon in the high Himalayas

et al. 2016

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The light‐absorbing properties of water‐soluble brown carbon (WS‐BrC) and methanol‐soluble brown carbon (MeS‐BrC) were studied in PM10 aerosols collected at the “Nepal Climate Observatory‐Pyramid” (NCO‐P) station (5079 m above sea level) during the period 2013–2014. The light absorption coefficients of WS‐BrC and MeS‐BrC were the highest during the premonsoon season and the lowest during monsoon. MeS‐BrC absorbs about 2 times higher at 365 nm and about 3 times more at 550 nm compared to WS‐BrC. The mass absorption cross section (MAC) of WS‐BrC measured at 365 nm is similar to that observed previously at South Asian low‐altitude sites. Fractional solar radiation absorption by BrC compared to BC considering the full solar spectrum showed that WS‐BrC absorbs 4 ± 1% and MeS‐BrC absorbs 9 ± 2% compared to BC at NCO‐P. Such ratios become 8 ± 1% (for WS‐BrC respect to BC) and 17 ± 5% (for MeS‐BrC respect to BC) when accounting for correction factors proposed by previous studies to convert absorption coefficients in bulk solutions into light absorption by accumulation mode aerosol particles. These results confirm the importance of BrC in contributing to light‐absorbing aerosols in this region of the world. However, the BrC absorption at 550 nm appears small compared to that of BC (1–5%, or 3–9% with conversion factors), and it is lower compared to global model estimates constrained by Aerosol Robotic Network observations. Finally, our study provides no clear evidence of a change in the fractional contribution of BrC with respect to BC to light absorption in the middle troposphere respect to the Indo‐Gangetic plain boundary layer.

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Mass absorption efficiency of light absorbing organic aerosols from source region of paddy-residue burning emissions in the Indo-Gangetic Plain

Cited by 129 publications

References 65 publications

Synergistic effect in absorption properties of brown carbon and elemental carbon over IGP during weak south-west monsoon

Synergistic effect in absorption properties of brown carbon and elemental carbon over IGP during weak south-west monsoon

Size-Segregated Characteristics of Carbonaceous Aerosols over the Northwestern Indo-Gangetic Plain: Year Round Temporal Behavior

Light absorption properties of brown carbon in the high Himalayas

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