Large contribution of organics to condensational growth and formation of cloud condensation nuclei (CCN) in the remote marine boundary layer
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Published:2020-11-01
Issue:21
Volume:20
Page:12515-12525
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Zheng GuangjieORCID, Kuang Chongai, Uin JanekORCID, Watson Thomas, Wang JianORCID
Abstract
Abstract. Marine low clouds strongly influence global climate, and their radiative
effects are particularly susceptible to the concentration of cloud
condensation nuclei (CCN). One major source of CCN is the condensational growth
of pre-CCN particles, and sulfate has long been considered the major
condensing species in the remote marine boundary layer. While some studies
have suggested that secondary organic species can contribute to particle
growth, its importance remains unclear. Here we present the first long-term
observational evidence that organics play an important role in particle
growth over remote oceans. To the contrary of traditional thinking, sulfate
dominated condensational growth for only a small (∼18 %)
fraction of the 62 observed growth events, even fewer than the
organic-dominated events (24 %). During most (58 %) growth events, the
major condensing species included both organics and sulfate. Potential
precursors of the secondary organics are volatile organic compounds from
ocean biological activities and those produced by the air–sea interfacial
oxidation. Our results indicate that the condensation of secondary organics
contributes strongly to the growth of pre-CCN particles and thereby the CCN
population over remote oceans.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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