New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation
It has recently been recognized that, in addition to greenhouse gases, anthropogenic emissions of ozone-depleting substances (ODS) can induce long-term trends in the Brewer-Dobson circulation (BDC). Several studies have shown that a substantial fraction of the residual circulation acceleration over...
Published in: | Journal of Geophysical Research: Atmospheres |
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Language: | English |
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2019
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Online Access: | https://doi.org/10.1029/2018JD029301 |
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ftncar:oai:drupal-site.org:articles_22409 2023-07-30T03:57:57+02:00 New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation Abalos, Marta (author) Polvani, Lorenzo (author) Calvo, Natalia (author) Kinnison, Douglas (author) Ploeger, Felix (author) Randel, William (author) Solomon, Susan (author) 2019-03-16 https://doi.org/10.1029/2018JD029301 en eng Journal of Geophysical Research: Atmospheres--J. Geophys. Res. Atmos.--2169897X articles:22409 ark:/85065/d7q81h4s doi:10.1029/2018JD029301 Copyright 2019 American Geophysical Union. article Text 2019 ftncar https://doi.org/10.1029/2018JD029301 2023-07-17T18:25:40Z It has recently been recognized that, in addition to greenhouse gases, anthropogenic emissions of ozone-depleting substances (ODS) can induce long-term trends in the Brewer-Dobson circulation (BDC). Several studies have shown that a substantial fraction of the residual circulation acceleration over the last decades of the twentieth century can be attributed to increasing ODS. Here the mechanisms of this influence are examined, comparing model runs to reanalysis data and evaluating separately the residual circulation and mixing contributions to the mean age of air trends. The effects of ozone depletion in the Antarctic lower stratosphere are found to dominate the ODS impact on the BDC, while the direct radiative impact of these substances is negligible over the period of study. We find qualitative agreement in austral summer BDC trends between model and reanalysis data and show that ODS are the main driver of both residual circulation and isentropic mixing trends over the last decades of the twentieth century. Moreover, aging by isentropic mixing is shown to play a key role on ODS-driven age of air trends. Article in Journal/Newspaper Antarc* Antarctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic The Antarctic Austral Journal of Geophysical Research: Atmospheres 124 5 2435 2451 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
It has recently been recognized that, in addition to greenhouse gases, anthropogenic emissions of ozone-depleting substances (ODS) can induce long-term trends in the Brewer-Dobson circulation (BDC). Several studies have shown that a substantial fraction of the residual circulation acceleration over the last decades of the twentieth century can be attributed to increasing ODS. Here the mechanisms of this influence are examined, comparing model runs to reanalysis data and evaluating separately the residual circulation and mixing contributions to the mean age of air trends. The effects of ozone depletion in the Antarctic lower stratosphere are found to dominate the ODS impact on the BDC, while the direct radiative impact of these substances is negligible over the period of study. We find qualitative agreement in austral summer BDC trends between model and reanalysis data and show that ODS are the main driver of both residual circulation and isentropic mixing trends over the last decades of the twentieth century. Moreover, aging by isentropic mixing is shown to play a key role on ODS-driven age of air trends. |
author2 |
Abalos, Marta (author) Polvani, Lorenzo (author) Calvo, Natalia (author) Kinnison, Douglas (author) Ploeger, Felix (author) Randel, William (author) Solomon, Susan (author) |
format |
Article in Journal/Newspaper |
title |
New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation |
spellingShingle |
New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation |
title_short |
New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation |
title_full |
New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation |
title_fullStr |
New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation |
title_full_unstemmed |
New insights on the impact of ozone-depleting substances on the Brewer-Dobson Circulation |
title_sort |
new insights on the impact of ozone-depleting substances on the brewer-dobson circulation |
publishDate |
2019 |
url |
https://doi.org/10.1029/2018JD029301 |
geographic |
Antarctic The Antarctic Austral |
geographic_facet |
Antarctic The Antarctic Austral |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Journal of Geophysical Research: Atmospheres--J. Geophys. Res. Atmos.--2169897X articles:22409 ark:/85065/d7q81h4s doi:10.1029/2018JD029301 |
op_rights |
Copyright 2019 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2018JD029301 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
124 |
container_issue |
5 |
container_start_page |
2435 |
op_container_end_page |
2451 |
_version_ |
1772820413340975104 |