Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics
It has been suggested that increased stratospheric sulfate aerosol loadings following large, low latitude volcanic eruptions can lead to wintertime warming over Eurasia through dynamical stratosphere-troposphere coupling. We here investigate the proposed connection in the context of hypothetical fut...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-21-6985-2021 |
id |
ftncar:oai:drupal-site.org:articles_24324 |
---|---|
record_format |
openpolar |
spelling |
ftncar:oai:drupal-site.org:articles_24324 2024-04-14T08:15:33+00:00 Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics Banerjee, Antara (author) Butler, Amy H. (author) Polvani, Lorenzo M. (author) Robock, Alan (author) Simpson, Isla R. (author) Sun, Lantao (author) 2021-05-07 https://doi.org/10.5194/acp-21-6985-2021 en eng Atmospheric Chemistry and Physics--Atmos. Chem. Phys.--1680-7324 Stratospheric Aerosol Geoengineering Large Ensemble--10.5065/D6JH3JXX antara-banerjee/GeoengineeringLE_WinterWarming: Publication Code--10.5281/zenodo.4713591 articles:24324 ark:/85065/d7057kb1 doi:10.5194/acp-21-6985-2021 Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2021 ftncar https://doi.org/10.5194/acp-21-6985-2021 2024-03-21T18:00:26Z It has been suggested that increased stratospheric sulfate aerosol loadings following large, low latitude volcanic eruptions can lead to wintertime warming over Eurasia through dynamical stratosphere-troposphere coupling. We here investigate the proposed connection in the context of hypothetical future stratospheric sulfate geoengineering in the Geoengineering Large Ensemble simulations. In those geoengineering simulations, we find that stratospheric circulation anomalies that resemble the positive phase of the Northern Annular Mode in winter are a distinguishing climate response which is absent when increasing greenhouse gases alone are prescribed. This stratospheric dynamical response projects onto the positive phase of the North Atlantic Oscillation, leading to associated side effects of this climate intervention strategy, such as continental Eurasian warming and precipitation changes. Seasonality is a key signature of the dynamically driven surface response. We find an opposite response of the North Atlantic Oscillation in summer, when no dynamical role of the stratosphere is expected. The robustness of the wintertime forced response stands in contrast to previously proposed volcanic responses. 1852977 Article in Journal/Newspaper North Atlantic North Atlantic oscillation OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Atmospheric Chemistry and Physics 21 9 6985 6997 |
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 been suggested that increased stratospheric sulfate aerosol loadings following large, low latitude volcanic eruptions can lead to wintertime warming over Eurasia through dynamical stratosphere-troposphere coupling. We here investigate the proposed connection in the context of hypothetical future stratospheric sulfate geoengineering in the Geoengineering Large Ensemble simulations. In those geoengineering simulations, we find that stratospheric circulation anomalies that resemble the positive phase of the Northern Annular Mode in winter are a distinguishing climate response which is absent when increasing greenhouse gases alone are prescribed. This stratospheric dynamical response projects onto the positive phase of the North Atlantic Oscillation, leading to associated side effects of this climate intervention strategy, such as continental Eurasian warming and precipitation changes. Seasonality is a key signature of the dynamically driven surface response. We find an opposite response of the North Atlantic Oscillation in summer, when no dynamical role of the stratosphere is expected. The robustness of the wintertime forced response stands in contrast to previously proposed volcanic responses. 1852977 |
author2 |
Banerjee, Antara (author) Butler, Amy H. (author) Polvani, Lorenzo M. (author) Robock, Alan (author) Simpson, Isla R. (author) Sun, Lantao (author) |
format |
Article in Journal/Newspaper |
title |
Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics |
spellingShingle |
Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics |
title_short |
Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics |
title_full |
Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics |
title_fullStr |
Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics |
title_full_unstemmed |
Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics |
title_sort |
robust winter warming over eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-21-6985-2021 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Atmospheric Chemistry and Physics--Atmos. Chem. Phys.--1680-7324 Stratospheric Aerosol Geoengineering Large Ensemble--10.5065/D6JH3JXX antara-banerjee/GeoengineeringLE_WinterWarming: Publication Code--10.5281/zenodo.4713591 articles:24324 ark:/85065/d7057kb1 doi:10.5194/acp-21-6985-2021 |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.5194/acp-21-6985-2021 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
21 |
container_issue |
9 |
container_start_page |
6985 |
op_container_end_page |
6997 |
_version_ |
1796313915029716992 |