Link between local scale BC emissions in the Indo-Gangetic Plains and large scale atmospheric solar absorption 1Center for Clouds, Chemistry and Climate, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive, MC 0221, La Jolla, CA 92093-0221, USA
30 Jan 2012
2The Energy and Resources Institute, Darbari Seth Block, IHC Complex, Lodhi Road, New Delhi, 110003, India
Received: 07 June 2011 – Published in Atmos. Chem. Phys. Discuss.: 28 July 2011 Abstract. Project Surya has documented indoor and outdoor concentrations of black
carbon (BC) from traditional biomass burning cook stoves in a rural village
located in the Indo-Gangetic Plains (IGP) region of N. India from November
2009–September 2010. In this paper, we systematically document the link
between local scale aerosol properties and column averaged regional aerosol
optical properties and atmospheric radiative forcing. We document
observations from the first phase of Project Surya and estimate the source
dependent (biomass and fossil fuels) aerosol optical properties from local
to regional scale. Data were collected using surface based observations of
BC, organic carbon (OC), aerosol light absorption, scattering coefficient at
the Surya village (SVI_1) located in IGP region and integrated with
satellite and AERONET observations at the regional scale (IGP). The daily
mean BC concentrations at SVI_1 showed a large increase of BC during the
dry season (December to February) with values reaching 35 μg m−3.
Space based LIDAR data revealed how the biomass smoke was trapped within the
first kilometer during the dry season and extended to above 5 km during the
pre-monsoon season. As a result, during the dry season, the variance in the
daily mean single scattering albedo (SSA), the ratio of scattering to
extinction coefficient, and column aerosol optical properties at the local
IGP site correlated (with slopes in the range of 0.85 to 1.06 and
R2>0.4) well with the "IGP_AERONET" (mean of six AERONET sites).
The statistically significant correlation suggested that in-situ
observations can be used to derive spatial mean forcing, at least for the
dry season. The atmospheric forcing due to BC and OC exceeded 20 Wm−2
during all months from November to May, supporting the deduction that
elimination of cook stove smoke emissions through clean cooking technologies
will likely have a major positive impact not only on human health but also
on regional climate.
Revised: 09 December 2011 – Accepted: 05 January 2012 – Published: 30 January 2012
Citation: Praveen, P. S., Ahmed, T., Kar, A., Rehman, I. H., and Ramanathan, V.: Link between local scale BC emissions in the Indo-Gangetic Plains and large scale atmospheric solar absorption, Atmos. Chem. Phys., 12, 1173-1187, doi:10.5194/acp-12-1173-2012, 2012.