Optical properties and CCN activity of aerosols in a high-altitude Himalayan environment: Results from RAWEX-GVAX: CCN activity of aerosols over Himalayas

Gogoi, Mukunda M.; Babu, S. Suresh; Jayachandran, V.; Moorthy, K. Krishna; Satheesh, S. K.; Naja, Manish; Kotamarthi, V. R.

doi:10.1002/2014JD022966

Title: Optical properties and CCN activity of aerosols in a high-altitude Himalayan environment: Results from RAWEX-GVAX: CCN activity of aerosols over Himalayas

Journal Article · Tue Feb 24 00:00:00 EST 2015 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1002/2014JD022966· OSTI ID:1392414

Gogoi, Mukunda M. ^[1]; Babu, S. Suresh ^[1]; Jayachandran, V. ^[1]; Moorthy, K. Krishna ^[2]; Satheesh, S. K. ^[3]; Naja, Manish ^[4];

^[5]

Vikram Sarabhai Space Centre, Thiruvananthapuram (India). Space Physics Lab.
Indian Space Research Organization Head Quarters, Bangalore (India)
Indian Inst. of Science, Bangalore (India). Centre for Atmospheric and Oceanic Sciences
Aryabhatta Research Inst. of Observational Sciences, Nainital (India)
Argonne National Lab. (ANL), Argonne, IL (United States)

The seasonality and mutual dependence of aerosol optical properties and cloud condensation nuclei (CCN) activity under varying meteorological conditions at the high-altitude Nainital site (~2 km) in the Indo-Gangetic Plains were examined using nearly year-round measurements (June 2011 to March 2012) at the Atmospheric Radiation Measurement (ARM) mobile facility as part of the RAWEX-GVAX experiment of the Indian Space Research Organization and the U.S. Department of Energy. The results from collocated measurements provided enhanced aerosol scattering and absorption coefficients, CCN concentrations and total condensation nuclei (CN) concentrations during the dry autumn and winter months. The CCN concentration (at a supersaturation of 0.46) was higher during periods of high aerosol absorption (single-scattering albedo (SSA) < 0.80) than during periods of high aerosol scattering (SSA > 0.85), indicating that the aerosol composition seasonally changes and influences the CCN activity. The monthly mean CCN activation ratio (at a supersaturation of 0.46) was highest (> 0.7) in late autumn (November); this finding is attributed to the contribution of biomass-burning aerosols to CCN formation at high supersaturation conditions.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1392414

Journal Information:: Journal of Geophysical Research: Atmospheres, Vol. 120, Issue 6; ISSN 2169-897X

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Optical properties and CCN activity of aerosols in a high-altitude Himalayan environment: Results from RAWEX-GVAX: CCN activity of aerosols over Himalayas

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