Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica
Atmospheric sphericity is an important factor that must be considered in order to evaluate an accurate ozone loss rate in the polar stratosphere. The built-in plane-parallel radiative transfer scheme of a nudging chemical transport model (CTM) and an atmospheric general circulation model (AGCM) with...
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American Geophysical Union
2005
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ftunivtokyo:oai:repository.dl.itc.u-tokyo.ac.jp:00000894 2023-05-15T13:35:43+02:00 Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica Kurokawa, Jun-ichi 3540 Akiyoshi, Hideharu 3541 Nagashima, Tatsuya 3542 Masunaga, Hirohiko 3543 Nakajima, Teruyuki 3544 Takahashi, Masaaki 3545 Nakane, Hideaki 3546 2005-11-04 application/pdf https://repository.dl.itc.u-tokyo.ac.jp/record/894/files/Nakajima2005JGRA_H24P105.pdf eng eng American Geophysical Union doi:10.1029/2005JD005798 http://doi.org/10.1029/2005JD005798 Journal of geophysical research. D 21 110 D21305 AA10819765 01480227 https://repository.dl.itc.u-tokyo.ac.jp/record/894/files/Nakajima2005JGRA_H24P105.pdf Copyright 2005 by the American Geophysical Union. 451 2005 ftunivtokyo https://doi.org/10.1029/2005JD005798 2022-12-23T05:04:59Z Atmospheric sphericity is an important factor that must be considered in order to evaluate an accurate ozone loss rate in the polar stratosphere. The built-in plane-parallel radiative transfer scheme of a nudging chemical transport model (CTM) and an atmospheric general circulation model (AGCM) with coupled chemistry is modified by a pseudospherical approximation. The plane-parallel atmosphere radiative transfer version (PPA version) is compared with the pseudospherical atmosphere radiative transfer version (SA version) for both the nudging CTM and AGCM. The nudging CTM can isolate the chemical effects for a given dynamical field, while the interaction among the chemical, radiative, and dynamical processes can be studied with the AGCM. The present analysis focuses on Antarctica during an ozone hole period. In the ozone loss period over Antarctica, ozone starts to decrease earlier and minimum value of total ozone becomes lower in the SA versions of both the nudging CTM and the AGCM than in the corresponding PPA versions. The ozone mixing ratio decreases earlier in the SA version because of an earlier increase of ClO concentration initiated by the upward actinic flux at solar zenith angles greater than 90°. Dynamics plays an important role as well as the chemical processes. During the ozone recovery period, the ozone distribution becomes almost the same in the SA and PPA versions of the nudging CTM, while in the AGCM the ozone amount in the SA version remains at lower values compared to those of the PPA version. In the AGCM, a decrease of ozone over Antarctica enhances the latitudinal gradient of temperature and thus strengthens the polar vortex in the SA version. A resultant delay of the polar vortex breakup causes the delay of the ozone recovery. For the AGCM, ensemble runs are performed. The ensemble experiment exhibits large ozone variances after the middle of December, when the ozone recovery is dynamically controlled. Most ensemble members of the AGCM show a delay of the polar vortex breakup in the SA ... Other/Unknown Material Antarc* Antarctica The University of Tokyo: UT Repository Journal of Geophysical Research 110 D21 |
institution |
Open Polar |
collection |
The University of Tokyo: UT Repository |
op_collection_id |
ftunivtokyo |
language |
English |
topic |
451 |
spellingShingle |
451 Kurokawa, Jun-ichi 3540 Akiyoshi, Hideharu 3541 Nagashima, Tatsuya 3542 Masunaga, Hirohiko 3543 Nakajima, Teruyuki 3544 Takahashi, Masaaki 3545 Nakane, Hideaki 3546 Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica |
topic_facet |
451 |
description |
Atmospheric sphericity is an important factor that must be considered in order to evaluate an accurate ozone loss rate in the polar stratosphere. The built-in plane-parallel radiative transfer scheme of a nudging chemical transport model (CTM) and an atmospheric general circulation model (AGCM) with coupled chemistry is modified by a pseudospherical approximation. The plane-parallel atmosphere radiative transfer version (PPA version) is compared with the pseudospherical atmosphere radiative transfer version (SA version) for both the nudging CTM and AGCM. The nudging CTM can isolate the chemical effects for a given dynamical field, while the interaction among the chemical, radiative, and dynamical processes can be studied with the AGCM. The present analysis focuses on Antarctica during an ozone hole period. In the ozone loss period over Antarctica, ozone starts to decrease earlier and minimum value of total ozone becomes lower in the SA versions of both the nudging CTM and the AGCM than in the corresponding PPA versions. The ozone mixing ratio decreases earlier in the SA version because of an earlier increase of ClO concentration initiated by the upward actinic flux at solar zenith angles greater than 90°. Dynamics plays an important role as well as the chemical processes. During the ozone recovery period, the ozone distribution becomes almost the same in the SA and PPA versions of the nudging CTM, while in the AGCM the ozone amount in the SA version remains at lower values compared to those of the PPA version. In the AGCM, a decrease of ozone over Antarctica enhances the latitudinal gradient of temperature and thus strengthens the polar vortex in the SA version. A resultant delay of the polar vortex breakup causes the delay of the ozone recovery. For the AGCM, ensemble runs are performed. The ensemble experiment exhibits large ozone variances after the middle of December, when the ozone recovery is dynamically controlled. Most ensemble members of the AGCM show a delay of the polar vortex breakup in the SA ... |
author |
Kurokawa, Jun-ichi 3540 Akiyoshi, Hideharu 3541 Nagashima, Tatsuya 3542 Masunaga, Hirohiko 3543 Nakajima, Teruyuki 3544 Takahashi, Masaaki 3545 Nakane, Hideaki 3546 |
author_facet |
Kurokawa, Jun-ichi 3540 Akiyoshi, Hideharu 3541 Nagashima, Tatsuya 3542 Masunaga, Hirohiko 3543 Nakajima, Teruyuki 3544 Takahashi, Masaaki 3545 Nakane, Hideaki 3546 |
author_sort |
Kurokawa, Jun-ichi |
title |
Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica |
title_short |
Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica |
title_full |
Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica |
title_fullStr |
Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica |
title_full_unstemmed |
Effects of atmospheric sphericity on stratospheric chemistry and dynamics over Antarctica |
title_sort |
effects of atmospheric sphericity on stratospheric chemistry and dynamics over antarctica |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
https://repository.dl.itc.u-tokyo.ac.jp/record/894/files/Nakajima2005JGRA_H24P105.pdf |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
doi:10.1029/2005JD005798 http://doi.org/10.1029/2005JD005798 Journal of geophysical research. D 21 110 D21305 AA10819765 01480227 https://repository.dl.itc.u-tokyo.ac.jp/record/894/files/Nakajima2005JGRA_H24P105.pdf |
op_rights |
Copyright 2005 by the American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2005JD005798 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
D21 |
_version_ |
1766069247067291648 |