Seasonal Characteristics of Aerosol Black Carbon in Relation to Long Range Transport over Tripura in Northeast India

Guha, Anirban; De, B. K.; Dhar, Pranab Kumar; Banik, Trisanu; Chakraborty, Monti; Roy, R.; Choudhury, Abhijit; Gogoi, Mukunda M.; Babu, S. Suresh; Moorthy, K. Krishna

doi:10.4209/aaqr.2014.02.0029

Cited by 48 publications

(9 citation statements)

References 62 publications

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“…Seasonal average concentration of BC and LAOC corresponded with the changes observed in the aerosol load; respectively they were (BC and LAOC) 2.2 µg m -3 and 1.5 µg m -3 (summer), 1.6 µg m -3 and 1.2 µg m -3 (monsoon) and 2.8 µg m -3 and 2.9 µg m -3 (winter). The seasonal profile of BC was comparable with other investigations from India (Tiwari et al, 2014;Guha et al, 2015).…”

Section: Temporal Profile Of Pm 25 Bc and Laocsupporting

confidence: 77%

Biomass Combustion a Dominant Source of Carbonaceous Aerosols in the Ambient Environment of Western Himalayas

Kumar

Attri

2016

Aerosol Air Qual. Res.

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Use of biomass combustion as primary energy source emit substantial amounts of carbonaceous aerosols (CA) in the Himalayan environment. Any understanding regarding the impact of CA on human health and climate requires a reliable estimation of compositional variability of CA associated carbon forms: Elemental carbon (EC), Organic carbon (OC), and Light absorbing organic carbon (LAOC). This investigation spanning over 14 months was undertaken in the rural part of the Western Himalayas to estimate temporal variability in the ambient aerosol load (PM 10 , PM 2.5 ), CA associated carbon forms. All CA associated carbon forms were part of PM 2.5 size fraction, their significantly high concentrations in winter corresponded with the high biomass combustion. Source apportionment of CA done on the basis of Char-EC/Soot-EC estimates showed that > 90% of the EC was Char-EC contributed by biomass and coal combustion in winter. Estimates of K + (tracer for biomass combustion) showed a strong association with CA associated carbon forms. The estimated values of CA associated carbon forms during winter matched with the reported values of emission factors for biomass burning. Both the mass and composition of ambient aerosol were predominantly contributed by biomass combustion in the region.

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Section: Temporal Profile Of Pm 25 Bc and Laocsupporting

confidence: 77%

Biomass Combustion a Dominant Source of Carbonaceous Aerosols in the Ambient Environment of Western Himalayas

Kumar

Attri

2016

Aerosol Air Qual. Res.

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“…The stepwise evolution of the Asian summer monsoon begins in spring and contributes a significant amount of rainfall to the total annual precipitation over China (25 %-40 %) and over South Asia (∼ 11 %-20 %) due to deep convection over the Bay of Bengal, Tibetan Plateau, and South China Sea (Guhathakurta and Rajeevan, 2008;Li et al, 2016). The distribution of OLR from NCEP Reanalysis data during the spring season confirms that deep convection occurs over the maritime continent that extends to the South China Sea, Bay of Bengal, Malay Peninsula, and Indonesia (Fig.…”

Section: Transport Of Biomass Burning Aerosol Into the Upper Troposphere And Lower Stratospherementioning

confidence: 99%

The outflow of Asian biomass burning carbonaceous aerosol into the upper troposphere and lower stratosphere in spring: radiative effects seen in a global model

et al. 2021

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Abstract. Biomass burning (BB) over Asia is a strong source of carbonaceous aerosols during spring. From ECHAM6–HAMMOZ model simulations and satellite observations, we show that there is an outflow of Asian BB carbonaceous aerosols into the upper troposphere and lower stratosphere (UTLS) (black carbon: 0.1 to 6 ng m−3 and organic carbon: 0.2 to 10 ng m−3) during the spring season. The model simulations show that the greatest transport of BB carbonaceous aerosols into the UTLS occurs from the Indochina and East Asia region by deep convection over the Malay Peninsula and Indonesia. The increase in BB carbonaceous aerosols enhances atmospheric heating by 0.001 to 0.02 K d−1 in the UTLS. The aerosol-induced heating and circulation changes increase the water vapor mixing ratios in the upper troposphere (by 20–80 ppmv) and in the lowermost stratosphere (by 0.02–0.3 ppmv) over the tropics. Once in the lower stratosphere, water vapor is further transported to the South Pole by the lowermost branch of the Brewer–Dobson circulation. These aerosols enhance the in-atmosphere radiative forcing (0.68±0.25 to 5.30±0.37 W m−2), exacerbating atmospheric warming, but produce a cooling effect on climate (top of the atmosphere – TOA: -2.38±0.12 to -7.08±0.72 W m−2). The model simulations also show that Asian carbonaceous aerosols are transported to the Arctic in the troposphere. The maximum enhancement in aerosol extinction is seen at 400 hPa (by 0.0093 km−1) and associated heating rates at 300 hPa (by 0.032 K d−1) in the Arctic.

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“…To assess the regional and global climate change, a detailed study of spatiotemporal distribution of BC concentration is required; BC being inert with around five days of residence time can be transported over long distances [13]. Although several studies have been carried out in different cities around the world (including Beijing [14], Lahore [15] and, in India, Delhi [16], Trivandrum [17], Ahmedabad [18], Pune [19], Vishakhaptnam [20], and Agartala [21]), few studies are available for the eastern-central plain region of the country such as Nagpur [22]. In most of the studies, BC mass concentration has been reported to be the highest in winter season, particularly in December.…”

mentioning

confidence: 99%

Wintertime Variation of Black Carbon in PM2.5 Aerosols Over an Urban Industrial City in East-Central India

Ahirwar¹,

Bajpai²

2017

Pol. J. Environ. Stud.

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Atmospheric aerosol affects local, regional, and global climate by directly absorbing and scattering the incoming and outgoing solar radiation [1], indirectly by altering the cloud microphysical properties [2], and semi-directly by reducing cloud coverage [3]. Aerosols also have an adverse impact on human health -particularly regarding respiratory and cardiovascular diseases [4]. Black carbon (BC) is a strongly light-absorbing component of the atmospheric aerosol, mainly PM 2.5 [5] formed during incomplete combustion of fossil fuels, biofuels, and biomass burning [6]. BC contributes to global warming [7][8] by possibly altering precipitation patterns [9] and melting glaciers due to snow albedo reduction [10]. Due to rapid urbanization and industrialization during the last decade, India and China are the largest BC emitters in the world, contributing 25 to 30% of global emissions of BC Pol. J. Environ. Stud. Vol. 26, No. 4 (2017), 1443-1451 , with 1.55 being the monthly average ratio for nighttime and daytime concentrations. Monthly average diurnal variation showed two distinct peaks, at morning with 39.84 µgm -3 (7:00-8:00 IST (Indian Standard Time)), and at night with 35.55 µgm -3 (00:00 -1:00 IST);and two distinct valleys, with lowest BC concentration (7.11 µgm , consistent with the nighttime average. A clear negative correlation between BC mass concentration and wind speed (r = -0.75), relative humidity (r = -0.30) and temperature (r = -0.19) was observed. The back-trajectory at surface level (50 m and 500 m) mostly originated from northeastern India, and for higher altitude (5,000 m), from Middle-Eastern and Arabian countries, except during the last week of December (Indian Ocean). The ratio and difference between BC mass measured at 370 nm and 880 nm showed biomass burning being the dominant cause at night.

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Seasonal Characteristics of Aerosol Black Carbon in Relation to Long Range Transport over Tripura in Northeast India

Cited by 48 publications

References 62 publications

Biomass Combustion a Dominant Source of Carbonaceous Aerosols in the Ambient Environment of Western Himalayas

Biomass Combustion a Dominant Source of Carbonaceous Aerosols in the Ambient Environment of Western Himalayas

The outflow of Asian biomass burning carbonaceous aerosol into the upper troposphere and lower stratosphere in spring: radiative effects seen in a global model

Wintertime Variation of Black Carbon in PM2.5 Aerosols Over an Urban Industrial City in East-Central India

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