Decreasing Trend in Black Carbon Aerosols Over the Indian Region

Manoj, Mohanan R.; Satheesh, S. K.; Moorthy, K. Krishna; Gogoi, Mukunda M.; Babu, S. Suresh

doi:10.1029/2018gl081666

Cited by 62 publications

(35 citation statements)

References 45 publications

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“…Similarly, contributions of carbonaceous components to the long-term trend of DRF over the Indian region cannot be ignored. From the study of BC trend over the Indian region, Manoj et al (2019) have indicated the presence of carbonaceous aerosols in the elevated lower free-tropospheric regions, even though a general decreasing trend of BC near the surface was revealed from the study. In addition to distinct source processes, influence of regional climate variables (e.g., seasonal and regional rainfall) on the variability of aerosol loading is important.…”

Section: Regional Variability Of Drfmentioning

confidence: 81%

Recent trend in the global distribution of aerosol direct radiative forcing from satellite measurements

Subba

Gogoi

Pathak

et al. 2020

Atmospheric Science Letters

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Global distribution of aerosol direct radiative forcing (DRF) is estimated using Clouds and Earth's Radiant Energy System (CERES) synoptic (SYN) 1 datasets. During 2001-2017, a statistically significant change of global DRFs is revealed with a general decreasing trend (i.e., a reduced cooling effect) at the top of the atmosphere (DRF TOA~0 .017 WÁm −2 Áyear −1) and at the surface (DRF SFC~0 .033 WÁm −2 Áyear −1) with rapid change over the land compared to the global ocean. South Asia and Africa/Middle East regions depict significant increasing trend of atmospheric warming by 0.025 and 0.002 WÁm −2 Áyear −1 whereas, the rest of the regions show a decline. These regional variations significantly modulate the global mean DRF (−5.36 ± 0.04 WÁm −2 at the TOA and − 9.64 ± 0.07 WÁm −2 at the surface during the study period). The observed DRF trends are coincident with the change in the underlying aerosol properties, for example, aerosol optical depth, Ångström exponent and partly due to the increasing columnar burden of SO 2 over some of the regions. This indicates that increasing industrialization and urbanization have caused prominent change in the DRF during recent decades.

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Section: Regional Variability Of Drfmentioning

confidence: 81%

Recent trend in the global distribution of aerosol direct radiative forcing from satellite measurements

Subba

Gogoi

Pathak

et al. 2020

Atmospheric Science Letters

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“…In India, several recent studies have used satellite and ground based measurements spanning over decade to find the trend in aerosol loading over Indian region 2,20–28 . Dey and Girolamo 20 and Dey et al .…”

Section: Introductionmentioning

confidence: 99%

Recent Increase in Winter Hazy Days over Central India and the Arabian Sea

Thomas

Sarangi

Kanawade

2019

Sci Rep

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Indian subcontinent is greatly vulnerable to air pollution, especially during the winter season. Here, we use 15 years (2003–2017) of satellite and model reanalysis datasets over India and adjoining Seas to estimate the trend in hazy days (i.e. days with high aerosol loading) during the dry winter season (November to February). The number of hazy days is increasing at the rate of ~2.6 days per year over Central India. Interestingly, this is higher than over the Indo-Gangetic Plain (~1.7 days/year), a well known global hotspot of particulate pollution. Consistent increasing trends in absorbing aerosols are also visible in the recent years. As a result, the estimated atmospheric warming trends over Central India are two-fold higher than that over Indo-Gangetic Plain. This anomalous increment in hazy days over Central India is associated with the relatively higher increase in biomass burning over the region. Moreover, the trend in aerosol loading over the Arabian Sea, which is located downwind to Central India, is also higher than that over the Bay of Bengal during the dry winter season. Our findings not only draw attention to the rapid deteriorating air quality over Central India, but also underline the significance of increasing biomass burning under the recent climate change.

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“…The simulated total AOD for natural (dust and sea salt) and anthropogenic aerosols (Figures 10a and 10b) shows that the total AOD is expected to increase in the mitigation scenario relative to the baseline scenario by >0.04 over India, primarily due to larger amounts of anthropogenic sulfate (>10 mg/m). Manoj et al (2019) recently showed decreasing trends in BC but increases in total AOD using a dense network of aerosol observatories established under the Aerosol Radiative Forcing over India (ARFINET). Increasing trends in total AOD over some Indian regions were also reported using ARFINET data earlier by Babu et al (2013).…”

Section: Total Aerosol Effects On the Ism Dynamics Under Anthropogenimentioning

confidence: 99%

Near‐Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present‐Day Characteristics of the Indian Summer Monsoon

et al. 2020

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Various air pollution mitigation scenarios have been proposed to improve the existing severe air quality problem over South Asia. Here we use a regional climate model to examine the response of the Indian summer monsoon (ISM) to two projected anthropogenic aerosol emission scenarios (a) short‐lived climate pollutant “mitigation” scenario (2020–2030) and (b) current legislation “baseline” scenario (2005–2015). In the mitigation scenario, carbonaceous aerosol (black carbon and organic carbon) emissions are projected to decrease while sulfate emissions are projected to increase. This is expected to result in a marginal increase in anthropogenic aerosol optical depth over India (by 0.04–0.08). The dominating effect of scattering aerosols over absorbing aerosols in the mitigation scenario is expected to enhance atmospheric cooling over the Indian landmass, which in turn dampens the latitudinal thermal gradient and leads to a weakening of the ISM. This effect also reduces dust emissions over the Arabian Peninsula and transport across the Arabian Sea, decreasing the influence of the dust radiative feedback on the ISM. In addition, the increased amounts of sulfate and decreased amounts of carbonaceous aerosols are expected to result in drier conditions over the central parts of India. We also show that changes in emissions of different types of anthropogenic aerosols induce a chain of feedbacks, which can modulate the space‐time variability of dust, thereby affecting the magnitude of dust radiative effects on the ISM dynamics. We conclude that it is critical from the policy point of view to implement strategies to cut the currently increasing sulfate emissions.

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Decreasing Trend in Black Carbon Aerosols Over the Indian Region

Cited by 62 publications

References 45 publications

Recent trend in the global distribution of aerosol direct radiative forcing from satellite measurements

Recent trend in the global distribution of aerosol direct radiative forcing from satellite measurements

Recent Increase in Winter Hazy Days over Central India and the Arabian Sea

Near‐Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present‐Day Characteristics of the Indian Summer Monsoon

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