Wintertime pollution over the Eastern Indo-Gangetic Plains as observed from MOPITT, CALIPSO and tropospheric ozone residual data

Kar, J.; Deeter, M. N.; Fishman, Jack; Liu, Z.; Omar, Ali; Creilson, J. K.; Trepte, Charles R.; Vaughan, Mark; Winker, David M.

doi:10.5194/acp-10-12273-2010

Cited by 66 publications

(39 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The critical role of transported dust in influencing aerosol optical properties is systematically observed in episodic events as well as in the intra-seasonal variability (Hyvarinen et al, 2009;Kompulla et al, 2009;Marinoni et al, 2010;Ram et al, 2010) at a few locations in the Himalayan region. Influx and accumulation of aerosols over northern and central India extends to elevated altitudes (above 3-4 km) Kuhlmann and Quass, 2010;Kar et al, 2010) and can be transported above the boundary layer clouds leading to enhanced absorption of solar radiation and regional warming . Mixed with heavy loadings of carbonaceous aerosols over northern India, mineral dust can potentially induce changes in the regional atmospheric circulation thereby redistributing the summer monsoon rainfall via the so-called Elevated Heat Pump mechanism .…”

Section: Introductionmentioning

confidence: 99%

Accumulation of aerosols over the Indo-Gangetic plains and southern slopes of the Himalayas: distribution, properties and radiative effects during the 2009 pre-monsoon season

et al. 2011

View full text Add to dashboard Cite

Abstract.We examine the distribution of aerosols and associated optical/radiative properties in the Gangetic-Himalayan region from simultaneous radiometric measurements over the Indo-Gangetic Plains (IGP) and the foothill/southern slopes of the Himalayas during the 2009 pre-monsoon season. Enhanced dust transport extending from the Southwest Asian arid regions into the IGP, results in seasonal mean (April-June) aerosol optical depths of over 0.6 -highest over Southern Asia. The influence of dust loading is greater over the Western IGP as suggested by pronounced coarse mode peak in aerosol size distribution and spectral single scattering albedo (SSA). Transported dust in the IGP, driven by prevailing westerly airmass, is found to be more absorbing (SSA 550 nm <0.9) than the near-desert region in Northwestern (NW) India suggesting mixing with carbonaceous aerosols in the IGP. On the contrary, significantly reduced dust transport is observed over eastern IGP and foothill/elevated Himalayan slopes in Nepal where strongly absorbing haze is prevalent, as indicated by lower SSA (0.85-0.9 at 440-1020 nm), suggesting presence of more absorbing aerosols compared to IGP. Additionally, our observations show a distinct diurnal pattern of aerosols with characCorrespondence to: R. Gautam (ritesh.gautam@nasa.gov) teristic large afternoon peak, from foothill to elevated mountain locations, associated with increased upslope transport of pollutants -that likely represent large-scale lifting of absorbing aerosols along the elevated slopes during pre-monsoon season. In terms of radiative impact of aerosols, over the source region of NW India, diurnal mean reduction in solar radiation fluxes was estimated to be 19-23 Wm −2 at surface (12-15 % of the surface solar insolation). Furthermore, based on limited observations of aerosol optical properties during the pre-monsoon period and comparison of our radiative forcing estimates with published literature, there exists a general spatial heterogeneity in the regional aerosol forcing, associated with the absorbing aerosol distribution over northern India, with both diurnal mean surface forcing and forcing efficiency over the IGP exceeding that over Northwestern India. Finally, the role of the seasonal progressive buildup of aerosol loading and water vapor is investigated in the observed net aerosol radiative effect over Northwestern India. The radiative impact of water vapor is found to amplify the net regional aerosol radiative forcing suggesting that the two exert forcing in tandem leading to enhanced surface cooling. It is suggested that water vapor contribution should be taken into account while assessing aerosol forcing impact for this region and other seasonally similar environments.

show abstract

Section: Introductionmentioning

confidence: 99%

Accumulation of aerosols over the Indo-Gangetic plains and southern slopes of the Himalayas: distribution, properties and radiative effects during the 2009 pre-monsoon season

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Over both the regions, December-February was characterized as relatively lower aerosol backscatter and confined aerosol layers near the sea surface, which was also consistent with AOD observation from MODIS. This result could be rationalised by relatively stable meteorological conditions during the winter season (Kar et al, 2010;Mishra et al, 2012a and references therein), which could inhibit the long-range transportation of polluted air-masses from land to oceanic regions.…”

Section: Climatology Of Aerosol Optical Depth (Aod)mentioning

confidence: 99%

Aerosol Climatology over the Bay of Bengal and Arabian Sea Inferred from Space-Borne Radiometers and Lidar Observations

Tiwari

Mishra

Singh

2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Atmospheric aerosols over the oceanic region are very important air pollutant and play a vital role in Earth's radiation budget and climate change. This study presents the aerosol climatology over the Bay of Bengal (BoB) and Arabian sea (AS) using long term (2006)(2007)(2008)(2009)(2010)(2011)(2012) data from space-borne radiometers [Moderate-Resolution Imaging Spectroradiometer (MODIS), Ozone Monitoring Instrument (OMI)] and space-based active lidar onboard Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO). AS experiences higher AOD as compared to that over BoB during the study period. A good periodicity along with strong intra-seasonal/annual variability in aerosol loading is also observed over both the study regions. Approximately one month lag is found for maximum aerosol loading period over AS and BoB for almost every year i.e., June-July for AS and May-June for BoB. This lag could be explained by pathway and timing of summer monsoon over the Indian subcontinent. Elevated layers of absorbing dust up to 2-4 km altitudes are observed during the pre-monsoon and monsoon seasons over both the regions. The CALIPSO measurements show strong seasonal heterogeneity in aerosol properties over both the regions, which is well corroborated with MODIS and OMI observations. This significant seasonal heterogeneity in aerosol loading has been explained by the role of transportation of aerosols from various emission sources using NOAA HYSPLIT back trajectory model at three different altitude levels viz. 500, 1500 and 2500 m height. The possible role of Indian summer monsoon in modulating the aerosol behaviour over AS and BoB is another important aspect of this study that need further analyses using higher spatio-temporal resolution data.

show abstract

“…In this case, Kanpur provides a complex overall environment over land in opposition to the more simplified dust environment at the nominally oceanic site of Cape Verde. Kanpur district has a high population density (∼ 4.5 million), has high industrial and biofuel emissions, is a receptor for dust from all along the Indo-Gangetic plane and as is key here, and a complex aerosol meteorology, particularly in wintertime (e.g., Nair et al, 2007;Gautam et al, 2007Gautam et al, , 2009Gautam et al, , 2011Kar et al, 2010;Arola et al, 2013). Given such complexity, it is little wonder that the global models have great difficulty with the region in the context of common metrics.…”

Section: Kanpurmentioning

confidence: 99%

Development towards a global operational aerosol consensus: basic climatological characteristics of the International Cooperative for Aerosol Prediction Multi-Model Ensemble (ICAP-MME)

Reid²,

et al. 2015

View full text Add to dashboard Cite

show abstract

Wintertime pollution over the Eastern Indo-Gangetic Plains as observed from MOPITT, CALIPSO and tropospheric ozone residual data

Cited by 66 publications

References 39 publications

Accumulation of aerosols over the Indo-Gangetic plains and southern slopes of the Himalayas: distribution, properties and radiative effects during the 2009 pre-monsoon season

Accumulation of aerosols over the Indo-Gangetic plains and southern slopes of the Himalayas: distribution, properties and radiative effects during the 2009 pre-monsoon season

Aerosol Climatology over the Bay of Bengal and Arabian Sea Inferred from Space-Borne Radiometers and Lidar Observations

Development towards a global operational aerosol consensus: basic climatological characteristics of the International Cooperative for Aerosol Prediction Multi-Model Ensemble (ICAP-MME)

Contact Info

Product

Resources

About