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Discussion papers
https://doi.org/10.5194/acp-2019-828
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-828
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 01 Oct 2019

Submitted as: research article | 01 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Cloud Condensation Nuclei properties of South Asian outflow over the northern Indian Ocean during winter

Vijayakumar S. Nair, Jayachandran Venugopalan Nair, Sobhan Kumar Kompalli, Mukunda M. Gogoi, and S. Suresh Babu Vijayakumar S. Nair et al.
  • Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India

Abstract. Extensive measurements of cloud condensation nuclei (CCN) and condensation nuclei (CN) concentrations in the South Asian outflow to the northern Indian Ocean were carried out on board an instrumented research vessel, as part of the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB) during winter season (January–February 2018). Measurements include a north-south transect across the South Asian plume over the northern Indian Ocean and east–west transect over the equatorial Indian Ocean (~ 2° S), which is far away from the continental sources. South Asian outflow over the northern Indian Ocean is characterized by the high values of CCN number concentration (~ 5000 cm−3), low CCN activation efficiency (~ 25 %) and steep increase in CCN concentration with an increase in supersaturation. In contrast, low CCN concentration (~ 1000 cm−3) with flat supersaturation spectra was found over the equatorial Indian Ocean. The CCN properties exhibited significant dependence on the geometric mean diameter (GMD) of the aerosol number size distribution and CCN activation efficiency decreased to low values (< 20 %) at the times of new particle formation events over near-coastal and remote oceanic regions. The analysis of the activation fractions for the similar aerosol size distributions over the northern Indian Ocean indicated the primary role of aerosol number size distribution, followed by the chemical composition on CCN activation efficiency. The dependence of CCN properties and activation fraction on size segregated aerosol number concentration, especially during the ultrafine particle events, is investigated in detail for the first time over the region.

Vijayakumar S. Nair et al.
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Vijayakumar S. Nair et al.
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Short summary
Extensive measurements of the aerosol and cloud condensation nuclei (CCN) properties in South Asian outflow to the northern Indian Ocean were carried out as a part of ICARB-2018 experiment during winter. At high supersaturations, most of the aerosols in the south Asian outflow get activated as CCN, whereas aerosol system over the equatorial Indian Ocean is less CCN efficient even at higher supersaturations.
Extensive measurements of the aerosol and cloud condensation nuclei (CCN) properties in South...
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