New Particle Formation and Growth to Climate-Relevant Aerosols at a Background Remote Site in the Western Himalaya

Sebastian, Mathew; Kanawade, Vijay P.; Soni, Vijay K.; Asmi, Eija; Westervelt, Daniel. M.; Vakkari, Ville; Hyvärinen, Antti‐Pekka; Pierce, Jeffrey R.; Hooda, Rakesh K.

doi:10.1029/2020jd033267

New Particle Formation and Growth to Climate-Relevant Aerosols at a Background Remote Site in the Western Himalaya

Journal Article · Thu Mar 11 04:00:00 EST 2021 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1029/2020jd033267· OSTI ID:1852747

Sebastian, Mathew ^[1]; ^[2]; Soni, Vijay K. ^[3]; Asmi, Eija ^[4]; ^[5]; Vakkari, Ville ^[6]; Hyvärinen, Antti‐Pekka ^[7]; ^[8]; ^[7]

Univ. of Hyderabad (India). Centre for Earth, Ocean and Atmospheric Sciences; Univ. of Hyderabad (India)
Univ. of Hyderabad (India). Centre for Earth, Ocean and Atmospheric Sciences
Ministry of Earth Sciences, New Delhi (India). India Meteorological Dept.
Finnish Meteorological Inst., Helsinki (Finland); Servicio Meteorológico Nacional, Buenos Aires (Argentina)
Columbia Univ., New York, NY (United States). Lamont‐Doherty Earth Observatory; NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
Finnish Meteorological Inst., Helsinki (Finland); North-West Univ., Potchefstroom (South Africa). Atmospheric Chemistry Research Group
Finnish Meteorological Inst., Helsinki (Finland)
Colorado State Univ., Fort Collins, CO (United States). Dept. of Atmospheric Science

New particle formation (NPF) can influence the Earth’s radiative budget when the newly formed particles grow to climate-relevant sizes. Here, we present analysis of 21-months of continuous aerosol size distribution measurements at a background remote site in the western Himalaya and provide observational evidence that newly formed particles grow to cloud condensation nuclei (CCN)-active sizes (i.e. >20-100 nm in diameter). Out of total 55 NPF events, 38 (66%) events occurred in the pre-monsoon season (March-May). NPF events were classified into those with and without pollution influence as polluted and cleaner, respectively, using black carbon data. The analysis of air mass age, based on the ratio of number concentration of Aitken to accumulation mode aerosols, indicated that NPF occurred in the relatively cleaner air masses reaching to the site. The median formation rate of 10 nm particles and particle growth rates for cleaner events were three-fold and two-fold, respectively, higher than polluted events. We present the first estimates of the survival probability of newly formed particles to 50 nm and 100 nm size, which was not attempted in an Indian environment previously. The survival probability to 50 nm particles ranged from 44 to 98%, with a mean and standard deviation of 82 ± 18%. On average, ~60% of the particles surviving to 50 nm survived to 100 nm, making the overall survival probability of 100 nm to 53 ± 31%. This indicates that the probability of nucleated particles growing to CCN-active sizes under a large source of condensing vapor (transported from nearby lower-altitude regions) and low pre-existing particle concentrations (background mountain site) is high compared to the previous studies. These findings highlight the importance of the efficiency of nucleation events for producing CCN, which is a critical basis of aerosol indirect effects.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Irvine, CA (United States)

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

Grant/Contract Number:: SC0019000

OSTI ID:: 1852747

Journal Information:: Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 7 Vol. 126; ISSN 2169-897X

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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cloud condensation nuclei
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the Himalaya

New Particle Formation and Growth to Climate-Relevant Aerosols at a Background Remote Site in the Western Himalaya

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