Aerosol black carbon quantification in the central Indo-Gangetic Plain: Seasonal heterogeneity and source apportionment

Vaishya, Aditya; Singh, Prayagraj; Rastogi, Shantanu; Babu, S. Suresh

doi:10.1016/j.atmosres.2016.10.001

Cited by 96 publications

(30 citation statements)

References 46 publications

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“…The low BC values (<1 μg m -3 ) during the wet-monsoon months at Solapur represent a cleaner atmosphere, while ~1.5 μg m -3 BC was reported from a coastal location in peninsular India (Babu and Moorthy, 2002) during monsoon. About 50 % reduction (10 to 6 μg m -3 ) in BC mass associated with the dominance of fossil fuel source replacing the biomass, during monsoon compared to the pre-monsoon values, was reported by Vaishya et al, (2017) from a heavily polluted IGP site. The low BC loading during the monsoon months over Solapur is due to the wet scavenging of aerosols and the distinct air mass reaching the site as well as due to less local burning during the active monsoon conditions.…”

Section: Overview Of Aerosol Loadingmentioning

confidence: 96%

CCN characteristics during the Indian Summer Monsoon over a rain-shadow region

Jayachandran¹,

Varghese²,

Murugavel³

et al. 2020

Preprint

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Abstract. Continuous aerosol and Cloud Condensation Nuclei (CCN) measurements carried out at the ground observational facility situated in the rain-shadow region of the Indian sub-continent are illustrated. These observations were part of the Cloud-Aerosol Interaction Precipitation Enhancement EXperiment (CAIPEEX) during the Indian Summer Monsoon season (June to September) of 2018. Observations are classified as dry-continental (monsoon break) and wet-marine (monsoon active) according to air mass history. CCN concentrations measured for a range of supersaturations (0.2–1.2 %) are parameterized using Twomey's empirical relationship. CCN concentrations even at low (0.2 %) supersaturation (SS) were high (> 1,000 cm-3) during continental conditions associated with high black carbon (BC~2,000 ng m-3) and columnar aerosol loading. During the marine air mass conditions, CCN concentrations diminished to ~ 350 cm-3 at 0.3 % SS and low aerosol loading persisted (BC~900 ng m-3). High CCN activation fraction (AF) of ~ 0.55 (at 0.3 % SS) were observed before the monsoon rainfall, which reduced to ~ 0.15 during the monsoon and enhanced to ~ 0.32 after that. Mostly mono-modal aerosol number-size distribution (NSD) with a mean geometric mean diameter (GMD) of ~ 85 nm, with least (~ 9 %) contribution from nucleation mode (

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Section: Overview Of Aerosol Loadingmentioning

confidence: 96%

CCN characteristics during the Indian Summer Monsoon over a rain-shadow region

Jayachandran¹,

Varghese²,

Murugavel³

et al. 2020

Preprint

View full text Add to dashboard Cite

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“…During this campaign, extensive airborne measurements of aerosols were made in the altitude range from very close to the surface to as high as 8 km, using the BAe-146-301 atmospheric research aircraft (Highwood et al, 2012;Johnson et al, 2012) over the Indian domain, in June-July 2016, covering the pre-onset and evolving phases of the ISM (Brooks et al, 2018), perhaps for the first time at such detail. This was closely preceded by airborne measurements of aerosol properties across the Indo-Gangetic Plains aboard an Indian aircraft up to an altitude of ∼ 3.5 km (Vaishya et al, 2017). In this paper, we report the vertical distribution of extinction coefficients and single scattering albedo during SWAAMI campaign and discuss the climate implications.…”

Section: Introductionmentioning

confidence: 92%

Vertical profiles of submicron aerosol single scattering albedo over the Indian region immediately before monsoon onset and during its development: research from the SWAAMI field campaign

et al. 2020

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Abstract. Vertical structures of aerosol single scattering albedo (SSA), from near the surface through the free troposphere, have been estimated for the first time at distinct geographical locations over the Indian mainland and adjoining oceans, using in situ measurements of aerosol scattering and absorption coefficients aboard the Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 aircraft during the South West Asian Aerosol Monsoon Interactions (SWAAMI) campaign from June to July 2016. These are used to examine the spatial variation of SSA profiles and also to characterize its transformation from just prior to the onset of Indian Summer Monsoon (June 2016) to its active phase (July 2016). Very strong aerosol absorption, with SSA values as low as 0.7, persisted in the lower altitudes (<3 km) over the Indo-Gangetic Plains (IGP), prior to the monsoon onset, with a west-to-east gradient; lower values occurred in the north-western arid regions, peaking in the central IGP and somewhat decreasing towards the eastern end. During the active phase of the monsoon, the SSA is found to increase remarkably, indicating far less absorption. Nevertheless, significant aerosol absorption persisted in the lower and middle troposphere over the IGP. Inputting these SSA and extinction profiles into a radiative transfer model, we examined the effects of using height-resolved information in estimating atmospheric heating rates due to aerosols, over similar estimates made using a single columnar value. It was noted that use of a single SSA value leads to an underestimation (overestimation) of the heating rates over regions with low (high) SSA, emphasizing the importance of height-resolved information. Further, the use of realistic profiles showed significant heating of the atmosphere by submicron aerosol absorption at the middle troposphere, which may have strong implications for clouds and climate.

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“…During this campaign, extensive airborne measurements of aerosols were made in the altitude range from very close to the surface to as high as 8 km, using UK's BAe-146-301 atmospheric research aircraft over the Indian domain, during June-July 2016 covering the pre-onset and evolving phases of the ISM , perhaps for the first time in this detail. This was closely preceded by airborne measurements of aerosol properties across the IGP aboard an Indian aircraft up to an altitude of ~3.5 km (Vaishya et al, 2017). In this paper, we report the vertical distribution of extinction coefficients and single scattering albedo during SWAAMI campaign and discuss the climate implications.…”

Section: Introductionmentioning

confidence: 94%

Vertical profiles of sub-micron aerosol single scattering albedo over Indian region immediately before monsoon onset and during its development: Research from the SWAAMI field campaign

Manoj¹,

Satheesh²,

Moorthy³

et al. 2019

Preprint

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<p><strong>Abstract.</strong> Vertical structures of aerosol single scattering albedo (SSA), from near the surface through the free troposphere, have been estimated for the first time at distinct geographical locations over the Indian mainland and adjoining oceans, using in-situ measurements of aerosol scattering and absorption coefficients aboard the FAAM BAe-146 aircraft during the South West Asian Aerosol Monsoon Interactions (SWAAMI) campaign from June to July 2016. These are used to examine the spatial variation of SSA profiles and also to characterize its transformation from just prior to the onset of Indian Summer Monsoon (June 2016) to its active phase (July 2016). Very strong aerosol absorption, with SSA values as low as 0.7, persisted in the lower altitudes (<&#8201;3&#8201;km) over the Indo-Gangetic Plains (IGP), prior to the onset of monsoon, with a west-to-east gradient; lower values occurred in the north-western arid regions, peaking in the central IGP and somewhat decreasing towards the eastern end. During the active phase of the monsoon, the SSA is found to increase remarkably, indicating far less absorption. Nevertheless, significant aerosol absorption persisted in the lower and middle troposphere over the IGP. Inputting these SSA and extinction profiles in a radiative transfer model, we examined the effects of using height-resolved information in estimating atmospheric heating rates due to aerosols, over similar estimates made using a single columnar value. It was noticed that use of a single SSA value leads to an underestimation (over-estimation) of the heating rates over regions with low (high) SSA emphasizing the importance of height resolved information. Further, the use of realistic profiles showed the significant heating of the atmosphere by sub-micron aerosol absorption at the middle troposphere, which would have strong implications for clouds and climate.</p>

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Aerosol black carbon quantification in the central Indo-Gangetic Plain: Seasonal heterogeneity and source apportionment

Cited by 96 publications

References 46 publications

CCN characteristics during the Indian Summer Monsoon over a rain-shadow region

CCN characteristics during the Indian Summer Monsoon over a rain-shadow region

Vertical profiles of submicron aerosol single scattering albedo over the Indian region immediately before monsoon onset and during its development: research from the SWAAMI field campaign

Vertical profiles of sub-micron aerosol single scattering albedo over Indian region immediately before monsoon onset and during its development: Research from the SWAAMI field campaign

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