English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The two most intense wildfires of the last decade that took place in Canadain 2017 and Australia in 2019-2020 were followed by large injections of smokein the stratosphere due to pyroconvection. It was discovered by Khaykin et al.(2020, doi:10.1038/s43247-020-00022-5) and Kablick et al. (2020,doi:10.1029/2020GL088101) that, after the Australian event, part of this smokeself-organized as anticyclonic confined vortices that rose in the mid-latitudestratosphere up to 35 km. Based on CALIOP observations and the ERA5 reanalysis,this new study analyzes the Canadian case and find, similarly, that a largeplume penetrated the stratosphere by 12 August 2017 and got trapped within ameso-scale anticyclonic structure which travelled across the Atlantic. It thenbroke into three offsprings that could be followed until mid-October performingthree round the world journeys and rising up to 23 km. We analyze the dynamicalstructure of the vortices produced by these two wildfires and demonstrate howthey are maintained by the assimilation of data from instruments measuring thesignature of the vortices in the temperature and ozone field. We propose thatthese vortices can be seen as bubbles of low absolute potential vorticity andsmoke carried vertically across the stratification from the troposphere insidethe middle stratosphere by their internal heating, against the descending fluxof the Brewer-Dobson circulation.

Smoke-charged vortices in the stratosphere generated by wildfires and their behaviour in both hemispheres : comparing Australia 2020 to Canada 2017