Abstract:
:The Montreal Protocol has succeeded in limiting major ozone-depleting substance emissions, and consequently stratospheric ozone concentrations are expected to recover this century. However, there is a large uncertainty in the rate of regional ozone recovery in the Northern Hemisphere. Here we identify a Eurasia-North America dipole mode in the total column ozone over the Northern Hemisphere, showing negative and positive total column ozone anomaly centres over Eurasia and North America, respectively. The positive trend of this mode explains an enhanced total column ozone decline over the Eurasian continent in the past three decades, which is closely related to the polar vortex shift towards Eurasia. Multiple chemistry-climate-model simulations indicate that the positive Eurasia-North America dipole trend in late winter is likely to continue in the near future. Our findings suggest that the anticipated ozone recovery in late winter will be sensitive not only to the ozone-depleting substance decline but also to the polar vortex changes, and could be substantially delayed in some regions of the Northern Hemisphere extratropics.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhang J,Tian W,Xie F,Chipperfield MP,Feng W,Son SW,Abraham NL,Archibald AT,Bekki S,Butchart N,Deushi M,Dhomse S,Han Y,Jöckel P,Kinnison D,Kirner O,Michou M,Morgenstern O,O'Connor FM,Pitari G,Plummer DA,Revell LEdoi
10.1038/s41467-017-02565-2subject
Has Abstractpub_date
2018-01-15 00:00:00pages
206issue
1issn
2041-1723pii
10.1038/s41467-017-02565-2journal_volume
9pub_type
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