Impact of stratospheric variability on tropospheric climate change
An improved stratospheric representation has been included in simulations with the Hadley Centre HadGEM1 coupled ocean atmosphere model with natural and anthropogenic forcings for the period 1979–2003. An improved stratospheric ozone dataset is employed that includes natural variations in ozone as w...
Published in: | Climate Dynamics |
---|---|
Main Authors: | , , , , , |
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | English |
Published: |
Springer
2010
|
Subjects: | |
Online Access: | https://elib.dlr.de/59631/ https://elib.dlr.de/59631/1/fulltext.pdf http://www.springerlink.com/content/nw420867510ht627/fulltext.pdf |
id |
ftdlr:oai:elib.dlr.de:59631 |
---|---|
record_format |
openpolar |
spelling |
ftdlr:oai:elib.dlr.de:59631 2023-05-15T15:12:15+02:00 Impact of stratospheric variability on tropospheric climate change Dall'Amico, Mauro Stott, Peter A. Scaife, Adam A. Gray, Lesley J. Rosenlof, Karen H. Karpechko, Alexey Yu. 2010 application/pdf https://elib.dlr.de/59631/ https://elib.dlr.de/59631/1/fulltext.pdf http://www.springerlink.com/content/nw420867510ht627/fulltext.pdf en eng Springer https://elib.dlr.de/59631/1/fulltext.pdf Dall'Amico, Mauro und Stott, Peter A. und Scaife, Adam A. und Gray, Lesley J. und Rosenlof, Karen H. und Karpechko, Alexey Yu. (2010) Impact of stratospheric variability on tropospheric climate change. Climate Dynamics, 34, Seiten 399-417. Springer. DOI:10.1007/s00382-009-0580-1 <https://doi.org/10.1007/s00382-009-0580-1> Dynamik der Atmosphäre Zeitschriftenbeitrag PeerReviewed 2010 ftdlr https://doi.org/10.1007/s00382-009-0580-1 2019-08-04T22:54:48Z An improved stratospheric representation has been included in simulations with the Hadley Centre HadGEM1 coupled ocean atmosphere model with natural and anthropogenic forcings for the period 1979–2003. An improved stratospheric ozone dataset is employed that includes natural variations in ozone as well as the usual anthropogenic trends. In addition, in a second set of simulations the quasi biennial oscillation (QBO) of stratospheric equatorial zonal wind is also imposed using a relaxation towards ERA-40 zonal wind values. The resulting impact on tropospheric variability and trends is described. We show that the modelled cooling rate at the tropopause is enhanced by the improved ozone dataset and this improvement is even more marked when the QBO is also included. The same applies to warming trends in the upper tropical troposphere which are slightly reduced. Our stratospheric improvements produce a significant increase of internal variability but no change in the positive trend of annual mean global mean near-surface temperature. Warming rates are increased significantly over a large portion of the Arctic Ocean. The improved stratospheric representation, especially the QBO relaxation, causes a substantial reduction in near-surface temperature and precipitation response to the El Chichón eruption, especially in the tropical region. The winter increase in the phase of the northern annular mode observed in the aftermath of the two major recent volcanic eruptions is partly captured, especially after the El Chichón eruption. The positive trend in the southern annular mode (SAM) is increased and becomes statistically significant which demonstrates that the observed increase in the SAM is largely subject to internal variability in the stratosphere. The possible inclusion in simulations for future assessments of full ozone chemistry and a gravity wave scheme to internally generate a QBO is discussed. Other Non-Article Part of Journal/Newspaper Arctic Arctic Ocean Climate change German Aerospace Center: elib - DLR electronic library Arctic Arctic Ocean Climate Dynamics 34 2-3 399 417 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
Dynamik der Atmosphäre |
spellingShingle |
Dynamik der Atmosphäre Dall'Amico, Mauro Stott, Peter A. Scaife, Adam A. Gray, Lesley J. Rosenlof, Karen H. Karpechko, Alexey Yu. Impact of stratospheric variability on tropospheric climate change |
topic_facet |
Dynamik der Atmosphäre |
description |
An improved stratospheric representation has been included in simulations with the Hadley Centre HadGEM1 coupled ocean atmosphere model with natural and anthropogenic forcings for the period 1979–2003. An improved stratospheric ozone dataset is employed that includes natural variations in ozone as well as the usual anthropogenic trends. In addition, in a second set of simulations the quasi biennial oscillation (QBO) of stratospheric equatorial zonal wind is also imposed using a relaxation towards ERA-40 zonal wind values. The resulting impact on tropospheric variability and trends is described. We show that the modelled cooling rate at the tropopause is enhanced by the improved ozone dataset and this improvement is even more marked when the QBO is also included. The same applies to warming trends in the upper tropical troposphere which are slightly reduced. Our stratospheric improvements produce a significant increase of internal variability but no change in the positive trend of annual mean global mean near-surface temperature. Warming rates are increased significantly over a large portion of the Arctic Ocean. The improved stratospheric representation, especially the QBO relaxation, causes a substantial reduction in near-surface temperature and precipitation response to the El Chichón eruption, especially in the tropical region. The winter increase in the phase of the northern annular mode observed in the aftermath of the two major recent volcanic eruptions is partly captured, especially after the El Chichón eruption. The positive trend in the southern annular mode (SAM) is increased and becomes statistically significant which demonstrates that the observed increase in the SAM is largely subject to internal variability in the stratosphere. The possible inclusion in simulations for future assessments of full ozone chemistry and a gravity wave scheme to internally generate a QBO is discussed. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Dall'Amico, Mauro Stott, Peter A. Scaife, Adam A. Gray, Lesley J. Rosenlof, Karen H. Karpechko, Alexey Yu. |
author_facet |
Dall'Amico, Mauro Stott, Peter A. Scaife, Adam A. Gray, Lesley J. Rosenlof, Karen H. Karpechko, Alexey Yu. |
author_sort |
Dall'Amico, Mauro |
title |
Impact of stratospheric variability on tropospheric climate change |
title_short |
Impact of stratospheric variability on tropospheric climate change |
title_full |
Impact of stratospheric variability on tropospheric climate change |
title_fullStr |
Impact of stratospheric variability on tropospheric climate change |
title_full_unstemmed |
Impact of stratospheric variability on tropospheric climate change |
title_sort |
impact of stratospheric variability on tropospheric climate change |
publisher |
Springer |
publishDate |
2010 |
url |
https://elib.dlr.de/59631/ https://elib.dlr.de/59631/1/fulltext.pdf http://www.springerlink.com/content/nw420867510ht627/fulltext.pdf |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Climate change |
genre_facet |
Arctic Arctic Ocean Climate change |
op_relation |
https://elib.dlr.de/59631/1/fulltext.pdf Dall'Amico, Mauro und Stott, Peter A. und Scaife, Adam A. und Gray, Lesley J. und Rosenlof, Karen H. und Karpechko, Alexey Yu. (2010) Impact of stratospheric variability on tropospheric climate change. Climate Dynamics, 34, Seiten 399-417. Springer. DOI:10.1007/s00382-009-0580-1 <https://doi.org/10.1007/s00382-009-0580-1> |
op_doi |
https://doi.org/10.1007/s00382-009-0580-1 |
container_title |
Climate Dynamics |
container_volume |
34 |
container_issue |
2-3 |
container_start_page |
399 |
op_container_end_page |
417 |
_version_ |
1766342956141248512 |