A central arctic extreme aerosol event triggered by a warm air-mass intrusion

Lubna Dada (Corresponding author), Hélène Angot, Ivo Beck, Andrea Baccarini, Lauriane L. J. Quelever, Matthew Boyer, Tiia M. Laurila, Zoé Brasseur, Gina Jozef, Gijs De Boer, Matthew D. Shupe *, Silvia Henning, Silvia Bucci, Marina Dütsch, Andreas Stohl, Tuukka Petäjä, Kaspar R. Daellenbach, Tuija Jokinen, Julia Schmale

Publications: Contribution to journalArticlePeer Reviewed

Abstract

Frequency and intensity of warm and moist air-mass intrusions into the Arctic have increased over the past decades and have been related to sea ice melt. During our year-long expedition in the remote central Arctic Ocean, a record-breaking increase in temperature, moisture and downwelling-longwave radiation was observed in mid-April 2020, during an air-mass intrusion carrying air pollutants from northern Eurasia. The two-day intrusion, caused drastic changes in the aerosol size distribution, chemical composition and particle hygroscopicity. Here we show how the intrusion transformed the Arctic from a remote low-particle environment to an area comparable to a central-European urban setting. Additionally, the intrusion resulted in an explosive increase in cloud condensation nuclei, which can have direct effects on Arctic clouds’ radiation, their precipitation patterns, and their lifetime. Thus, unless prompt actions to significantly reduce emissions in the source regions are taken, such intrusion events are expected to continue to affect the Arctic climate.
Original languageEnglish
Article number5290
Number of pages15
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - 8 Sep 2022

Austrian Fields of Science 2012

  • 103039 Aerosol physics
  • 105206 Meteorology

Keywords

  • BLACK CARBON
  • CHEMICAL-CHARACTERIZATION
  • HIGH-RESOLUTION
  • MIXED-PHASE
  • PARTICLE DISPERSION MODEL
  • PARTICULATE-MATTER
  • POLAR AMPLIFICATION
  • SOURCE APPORTIONMENT
  • SURFACE
  • TRANSPORT

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