Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results
The current standard version of the Whole Atmosphere Community Climate Model (WACCM) simulates Southern Hemisphere winter and spring temperatures that are too cold compared with observations. This "cold-pole bias" leads to unrealistically low ozone column amounts in Antarctic spring. Here,...
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ftncar:oai:drupal-site.org:articles_19488 2023-09-05T13:13:14+02:00 Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results Garcia, Rolando R. (author) Smith, Anne K. (author) Kinnison, Douglas E. (author) Cámara, Álvaro de la (author) Murphy, Damian J. (author) 2017-01 https://doi.org/10.1175/JAS-D-16-0104.1 en eng Journal of the Atmospheric Sciences--J. Atmos. Sci.--0022-4928--1520-0469 articles:19488 ark:/85065/d7k9399d doi:10.1175/JAS-D-16-0104.1 Copyright 2017 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. article Text 2017 ftncar https://doi.org/10.1175/JAS-D-16-0104.1 2023-08-14T18:46:40Z The current standard version of the Whole Atmosphere Community Climate Model (WACCM) simulates Southern Hemisphere winter and spring temperatures that are too cold compared with observations. This "cold-pole bias" leads to unrealistically low ozone column amounts in Antarctic spring. Here, the cold-pole problem is addressed by introducing additional mechanical forcing of the circulation via parameterized gravity waves. Insofar as observational guidance is ambiguous regarding the gravity waves that might be important in the Southern Hemisphere stratosphere, the impact of increasing the forcing by orographic gravity waves was investigated. This reduces the strength of the Antarctic polar vortex in WACCM, bringing it into closer agreement with observations, and accelerates the Brewer-Dobson circulation in the polar stratosphere, which warms the polar cap and improves substantially the simulation of Antarctic temperature. These improvements are achieved without degrading the performance of the model in the Northern Hemisphere stratosphere or in the mesosphere and lower thermosphere of either hemisphere. It is shown, finally, that other approaches that enhance gravity wave forcing can also reduce the cold-pole bias such that careful examination of observational evidence and model performance will be required to establish which gravity wave sources are dominant in the real atmosphere. This is especially important because a "downward control" analysis of these results suggests that the improvement of the cold-pole bias itself is not very sensitive to the details of how gravity wave drag is altered. NNX09AJ83G Article in Journal/Newspaper Antarc* Antarctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic The Antarctic Journal of the Atmospheric Sciences 74 1 275 291 |
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Open Polar |
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OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
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ftncar |
language |
English |
description |
The current standard version of the Whole Atmosphere Community Climate Model (WACCM) simulates Southern Hemisphere winter and spring temperatures that are too cold compared with observations. This "cold-pole bias" leads to unrealistically low ozone column amounts in Antarctic spring. Here, the cold-pole problem is addressed by introducing additional mechanical forcing of the circulation via parameterized gravity waves. Insofar as observational guidance is ambiguous regarding the gravity waves that might be important in the Southern Hemisphere stratosphere, the impact of increasing the forcing by orographic gravity waves was investigated. This reduces the strength of the Antarctic polar vortex in WACCM, bringing it into closer agreement with observations, and accelerates the Brewer-Dobson circulation in the polar stratosphere, which warms the polar cap and improves substantially the simulation of Antarctic temperature. These improvements are achieved without degrading the performance of the model in the Northern Hemisphere stratosphere or in the mesosphere and lower thermosphere of either hemisphere. It is shown, finally, that other approaches that enhance gravity wave forcing can also reduce the cold-pole bias such that careful examination of observational evidence and model performance will be required to establish which gravity wave sources are dominant in the real atmosphere. This is especially important because a "downward control" analysis of these results suggests that the improvement of the cold-pole bias itself is not very sensitive to the details of how gravity wave drag is altered. NNX09AJ83G |
author2 |
Garcia, Rolando R. (author) Smith, Anne K. (author) Kinnison, Douglas E. (author) Cámara, Álvaro de la (author) Murphy, Damian J. (author) |
format |
Article in Journal/Newspaper |
title |
Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results |
spellingShingle |
Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results |
title_short |
Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results |
title_full |
Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results |
title_fullStr |
Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results |
title_full_unstemmed |
Modification of the gravity wave parameterization in the Whole Atmosphere Community Climate Model: Motivation and results |
title_sort |
modification of the gravity wave parameterization in the whole atmosphere community climate model: motivation and results |
publishDate |
2017 |
url |
https://doi.org/10.1175/JAS-D-16-0104.1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Journal of the Atmospheric Sciences--J. Atmos. Sci.--0022-4928--1520-0469 articles:19488 ark:/85065/d7k9399d doi:10.1175/JAS-D-16-0104.1 |
op_rights |
Copyright 2017 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JAS-D-16-0104.1 |
container_title |
Journal of the Atmospheric Sciences |
container_volume |
74 |
container_issue |
1 |
container_start_page |
275 |
op_container_end_page |
291 |
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1776204168724217856 |