Observations of ozone depletion events in a Finnish boreal forest

Xuemeng Chen, Lauriane Lucie Josette Quéléver, Pak L Fung, Jutta Kesti, Matti Petteri Rissanen, Jaana Kaarina Bäck, Petri Ilkka Rinaldo Keronen, Heikki Junninen, Tuukka Taneli Petäjä, Veli-Matti Kerminen, Markku Tapio Kulmala

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


We investigated the concentrations and vertical profiles of ozone over a 20-year period (1996–2016) at the SMEAR II station in southern Finland. Our results showed that the typical daily median ozone concentrations were in the range of 20–50 ppb with clear diurnal and annual patterns. In general, the profile of ozone concentrations illustrated an increase as a function of heights. The main aim of our study was to address the frequency and strength of ozone depletion events at this boreal forest site. We observed more than a thousand of 10 min periods at 4.2 m, with ozone concentrations below 10 ppb, and a few tens of cases with ozone concentrations below 2 ppb. Among these observations, a number of ozone depletion events that lasted for more than 3 h were identified, and they occurred mainly in autumn and winter months. The low ozone concentrations were likely related to the formation of a low mixing layer under the conditions of low temperatures, low wind speeds, high relative humidities and limited intensity of solar radiation.
Original languageEnglish
Pages (from-to)49-63
Number of pages15
JournalAtmospheric Chemistry and Physics
Publication statusPublished - 2018
Externally publishedYes
Publication typeA1 Journal article-refereed


  • 114 Physical sciences


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