Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM)
So far, general circulation model studies have not been able to capture the magnitude and characteristics of the observed 11-year solar signal in the stratosphere satisfactorily. Here results from model experiments with the Freie Universität Berlin Climate Middle Atmosphere Model are presented that...
Published in: | Journal of Geophysical Research: Atmospheres |
---|---|
Main Authors: | , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2004
|
Subjects: | |
Online Access: | https://gfzpublic.gfz-potsdam.de/pubman/item/item_238372 |
id |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_238372 |
---|---|
record_format |
openpolar |
spelling |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_238372 2023-05-15T18:02:16+02:00 Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) Matthes, K. Langematz, U. Gray, L. Kodera, K. Labitzke, K. 0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2004 https://gfzpublic.gfz-potsdam.de/pubman/item/item_238372 unknown info:eu-repo/semantics/altIdentifier/doi/10.1029/2003JD004012 https://gfzpublic.gfz-potsdam.de/pubman/item/item_238372 Journal of Geophysical Research 550 - Earth sciences info:eu-repo/semantics/article 2004 ftgfzpotsdam https://doi.org/10.1029/2003JD004012 2022-09-14T05:56:13Z So far, general circulation model studies have not been able to capture the magnitude and characteristics of the observed 11-year solar signal in the stratosphere satisfactorily. Here results from model experiments with the Freie Universität Berlin Climate Middle Atmosphere Model are presented that are in considerable agreement with observations. The experiments used realistic spectral solar irradiance changes, ozone changes from a two-dimensional radiative-chemical-transport model, and a relaxation toward observed equatorial wind profiles throughout the stratosphere. During Northern Hemisphere winter a realistic poleward downward propagation of the polar night jet (PNJ) anomalies, significantly weaker planetary wave activity, and a weaker mean meridional circulation under solar maximum conditions are reproduced in the model. The observed interaction between the Sun and the Quasi-Biennial Oscillation (QBO) is captured and stratospheric warmings occur preferentially in the west phase of the QBO. Only the magnitude of the anomalies during the dynamically active season improves, whereas the summer signal and the signal at low latitudes are still too weak. The results emphasize the important role of equatorial winds in achieving a more realistic solar signal by producing a more realistic wind climatology. Furthermore, they confirm recent results that equatorial winds in the upper stratosphere, the region dominated by the Semiannual Oscillation, are an important factor in determining interannual variability of the PNJ. Article in Journal/Newspaper polar night GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Journal of Geophysical Research: Atmospheres 109 D6 n/a n/a |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Matthes, K. Langematz, U. Gray, L. Kodera, K. Labitzke, K. Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) |
topic_facet |
550 - Earth sciences |
description |
So far, general circulation model studies have not been able to capture the magnitude and characteristics of the observed 11-year solar signal in the stratosphere satisfactorily. Here results from model experiments with the Freie Universität Berlin Climate Middle Atmosphere Model are presented that are in considerable agreement with observations. The experiments used realistic spectral solar irradiance changes, ozone changes from a two-dimensional radiative-chemical-transport model, and a relaxation toward observed equatorial wind profiles throughout the stratosphere. During Northern Hemisphere winter a realistic poleward downward propagation of the polar night jet (PNJ) anomalies, significantly weaker planetary wave activity, and a weaker mean meridional circulation under solar maximum conditions are reproduced in the model. The observed interaction between the Sun and the Quasi-Biennial Oscillation (QBO) is captured and stratospheric warmings occur preferentially in the west phase of the QBO. Only the magnitude of the anomalies during the dynamically active season improves, whereas the summer signal and the signal at low latitudes are still too weak. The results emphasize the important role of equatorial winds in achieving a more realistic solar signal by producing a more realistic wind climatology. Furthermore, they confirm recent results that equatorial winds in the upper stratosphere, the region dominated by the Semiannual Oscillation, are an important factor in determining interannual variability of the PNJ. |
author2 |
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum |
format |
Article in Journal/Newspaper |
author |
Matthes, K. Langematz, U. Gray, L. Kodera, K. Labitzke, K. |
author_facet |
Matthes, K. Langematz, U. Gray, L. Kodera, K. Labitzke, K. |
author_sort |
Matthes, K. |
title |
Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) |
title_short |
Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) |
title_full |
Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) |
title_fullStr |
Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) |
title_full_unstemmed |
Improved 11-Year Solar Signal in the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) |
title_sort |
improved 11-year solar signal in the freie universität berlin climate middle atmosphere model (fub-cmam) |
publishDate |
2004 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_238372 |
genre |
polar night |
genre_facet |
polar night |
op_source |
Journal of Geophysical Research |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2003JD004012 https://gfzpublic.gfz-potsdam.de/pubman/item/item_238372 |
op_doi |
https://doi.org/10.1029/2003JD004012 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
109 |
container_issue |
D6 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766172063566921728 |