Frequent new particle formation over the high Arctic pack ice by enhanced iodine emissions.
- Baccarini A Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, PSI, Switzerland.
- Karlsson L Department of Environmental Science & Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden.
- Dommen J Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, PSI, Switzerland.
- Duplessis P Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada.
- Vüllers J School of Earth and Environment, University of Leeds, Leeds, UK.
- Brooks IM School of Earth and Environment, University of Leeds, Leeds, UK.
- Saiz-Lopez A Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain.
- Salter M Department of Environmental Science & Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden.
- Tjernström M Department of Meteorology & Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden.
- Baltensperger U Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, PSI, Switzerland.
- Zieger P Department of Environmental Science & Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden. paul.zieger@aces.su.se.
- Schmale J Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, PSI, Switzerland. julia.schmale@epfl.ch.
- 2020-10-02
Published in:
- Nature communications. - 2020
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English
In the central Arctic Ocean the formation of clouds and their properties are sensitive to the availability of cloud condensation nuclei (CCN). The vapors responsible for new particle formation (NPF), potentially leading to CCN, have remained unidentified since the first aerosol measurements in 1991. Here, we report that all the observed NPF events from the Arctic Ocean 2018 expedition are driven by iodic acid with little contribution from sulfuric acid. Iodic acid largely explains the growth of ultrafine particles (UFP) in most events. The iodic acid concentration increases significantly from summer towards autumn, possibly linked to the ocean freeze-up and a seasonal rise in ozone. This leads to a one order of magnitude higher UFP concentration in autumn. Measurements of cloud residuals suggest that particles smaller than 30 nm in diameter can activate as CCN. Therefore, iodine NPF has the potential to influence cloud properties over the Arctic Ocean.
- Language
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- English
- Open access status
- gold
- Identifiers
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- DOI 10.1038/s41467-020-18551-0
- PMID 33004812
- Persistent URL
- https://sonar.ch/global/documents/127280
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