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A gas-to-particle conversion mechanism helps to explain atmospheric particle formation through clustering of iodine oxides.

Abstract：

:Emitted from the oceans, iodine-bearing molecules are ubiquitous in the atmosphere and a source of new atmospheric aerosol particles of potentially global significance. However, its inclusion in atmospheric models is hindered by a lack of understanding of the first steps of the photochemical gas-to-particle conversion mechanism. Our laboratory results show that under a high humidity and low HOx regime, the recently proposed nucleating molecule (iodic acid, HOIO2) does not form rapidly enough, and gas-to-particle conversion proceeds by clustering of iodine oxides (IxOy), albeit at slower rates than under dryer conditions. Moreover, we show experimentally that gas-phase HOIO2 is not necessary for the formation of HOIO2-containing particles. These insights help to explain new particle formation in the relatively dry polar regions and, more generally, provide for the first time a thermochemically feasible molecular mechanism from ocean iodine emissions to atmospheric particles that is currently missing in model calculations of aerosol radiative forcing.

journal_name

Nat Commun

journal_title

Nature communications

authors

Gómez Martín JC,Lewis TR,Blitz MA,Plane JMC,Kumar M,Francisco JS,Saiz-Lopez A

doi

10.1038/s41467-020-18252-8

subject

Has Abstract

pub_date

2020-09-09 00:00:00

pages

4521

issue

1

issn

2041-1723

pii

10.1038/s41467-020-18252-8

journal_volume

11

pub_type

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