Altitude profiles of aerosol BC, derived from aircraft measurements over an inland urban location in India

Moorthy, K. Krishna; Babu, S. Suresh; Sunilkumar, S. V.; Gupta, Prabhat K.; Gera, B. S.

doi:10.1029/2004gl021336

Cited by 96 publications

(70 citation statements)

References 12 publications

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“…The eastward increasing trend in σ tsc is indicative of source regions of far-east (east Asian) continents. Significant impact of fine mode aerosols, advected from east Asia in enhancing the AOD, accumulation mode abundance and black carbon, over eastern BoB during winter have been also observed in earlier measurements from PBR (Moorthy et al, 2003;Moorthy and Babu, 2006). The present observations also corroborate these.…”

Section: Longitudinal Variationssupporting

confidence: 90%

“…During each sortie, measurements were carried, ambient air being sampled by the onboard instruments through a set of inlets fitted under the belly of the aircraft, close to its nose, such that the inlet opens into the incoming air as the aircraft flew (Moorthy et al, 2004;Babu et al, 2008). A highly sensitive GPS receiver (Trimble) was employed to obtain the information on its position, altitude, as well as time during the sorties at every one-second interval.…”

Section: Airborne Measurements and Databasementioning

confidence: 99%

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Airborne measurements of aerosol scattering properties above the MABL over Bay of Bengal during W_ICARB – characteristics and spatial gradients

et al. 2011

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Abstract. Realizing the importance of aerosol characterization and addressing its spatio-temporal heterogeneities over Bay of Bengal (BoB), campaign mode observations of aerosol parameters were carried out using simultaneous cruise, aircraft and land-based measurements during the Winter Integrated Campaign for Aerosols gases and Radiation Budget (W ICARB). Under this, airborne measurements of total and hemispheric backscatter coefficients were made over several regions of coastal India and eastern BoB using a three wavelength integrating nephelometer. The measurements include high resolution multi-level (ML) sorties for altitude profiles and bi-level (BL) sorties for spatial gradients within and above the Marine Atmospheric Boundary Layer (MABL) over BoB. The vertical profiles of the scattering coefficients are investigated in light of the information on the vertical structure of the atmospheric stability, which was derived from the collocated GPS (Global Positioning System) aided radiosonde ascents. In general, the altitude profiles revealed that the scattering coefficient remained steady in the convectively well-mixed regions and dropped off above the MABL. This decrease was quite rapid off the Indian mainland, while it was more gradual in the eastern BoB. Investigation on horizontal gradients revealed that the scattering coefficients over northern BoB are 3 to 4 times higher compared to that of central BoB within and above the MABL. A north-south gradient in scattering coefficients is observed over Port Blair in the eastern BoB, with values decreasing from south to north, which is attributed to the similar gradient in the surface wind speed, which can be replicated in the Correspondence to: S. Suresh Babu (s sureshbabu@vssc.gov.in) sea salt abundance. The gradients are parameterized using best-fit analytical functions.

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Section: Longitudinal Variationssupporting

confidence: 90%

Section: Airborne Measurements and Databasementioning

confidence: 99%

Airborne measurements of aerosol scattering properties above the MABL over Bay of Bengal during W_ICARB – characteristics and spatial gradients

et al. 2011

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“…As the ambient pressure at Ooty is lower than the standard conditions, the measured BC values were corrected (e.g. Moorthy et al, 2004) for its pressure. The true BC mass concentration (M BC ) is thus calculated as…”

Section: Instrumentation Database and Analysismentioning

confidence: 99%

Aerosol black carbon characteristics over a high-altitude Western Ghats location in Southern India

et al. 2014

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Abstract. Aerosol black carbon (BC) mass concentrations were continuously monitored over a period of 2 years (April 2010 to May 2012) from a high-altitude location Ooty in the Nilgiris Mountain range in southern India to characterize the distinct nature of absorbing aerosols and their seasonality. Despite being remote and sparsely inhabited, BC concentrations showed significant seasonality with higher values (∼ 0.96 ± 0.35 µg m −3 ) in summer (March to May), attributed to increased vertical transport of effluents in the upwind valley regions, which might have been confined to the surrounding valley regions within the very shallow winter boundary layer. The local atmospheric boundary layer (ABL) influence in summer was further modulated by the long-range transported aerosols from the eastern locations of Ooty. During monsoon (June-August), the concentrations were far reduced (∼ 0.23 ± 0.06 µg m −3 ) due to intense precipitation. Diurnal variations were found conspicuous mainly during summer season associated with local ABL. The spectral absorption coefficients (α abs ) depicted, in general, flatter distribution (mostly < 1.0 for more than 85 % of daily mean values), suggesting the relative dominance of fossil fuel combustion, though showed marginal seasonal change with higher values of α abs in summer.

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“…The Indian Ocean Experiment (INDOEX) employed aircraft aerosol profiling and measurements of aerosol profiles from island-based and ship-borne lidars (Müller et al, 2001a, b;Welton et al, 2002;Pelon et al, 2002). Vertical distribution of aerosol particles over the continental India have been measured in few studies only, including those carried out over the south central India (Moorthy et al, 2004;Gadhavi and Jayaraman, 2006). Long-term measurements are even sparser, even though continuous measurements of aerosol vertical distribution have been made at Visakhapatnam and Kharagpur (Niranjan et al, 2006(Niranjan et al, , 2007a.…”

Section: Introductionmentioning

confidence: 99%

Technical Note: One year of Raman-lidar measurements in Gual Pahari EUCAARI site close to New Delhi in India – Seasonal characteristics of the aerosol vertical structure

et al. 2012

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Abstract. One year of multi-wavelength (3 backscatter + 2 extinction + 1 depolarization) Raman lidar measurements at Gual Pahari, close to New Delhi, were analysed. The data was split into four seasons: spring (March-May), summer (June-August), autumn (September-November) and winter (December-February). The vertical profiles of backscatter, extinction, and lidar ratio and their variability during each season are presented. The measurements revealed that, on average, the aerosol layer was at its highest in spring (5.5 km). In summer, the vertically averaged (between 1-3 km) backscatter and extinction coefficients had the highest averages (3.3 Mm −1 sr −1 and 142 Mm −1 at 532 nm, respectively). Aerosol concentrations were slightly higher in summer compared to other seasons, and particles were larger in size. The autumn showed the highest lidar ratio and high extinction-relatedÅngström exponents (AE ext ), indicating the presence of smaller probably absorbing particles. The winter had the lowest backscatter and extinction coefficients, but AE ext was the highest, suggesting still a large amount of small particles.

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Altitude profiles of aerosol BC, derived from aircraft measurements over an inland urban location in India

Cited by 96 publications

References 12 publications

Airborne measurements of aerosol scattering properties above the MABL over Bay of Bengal during W_ICARB – characteristics and spatial gradients

Airborne measurements of aerosol scattering properties above the MABL over Bay of Bengal during W_ICARB – characteristics and spatial gradients

Aerosol black carbon characteristics over a high-altitude Western Ghats location in Southern India

Technical Note: One year of Raman-lidar measurements in Gual Pahari EUCAARI site close to New Delhi in India – Seasonal characteristics of the aerosol vertical structure

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