Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCM
Improved estimates of the radiative forcing from tropospheric ozone increases since the preindustrial have been calculated with the tropospheric chemistry model used at the Goddard Institute for Space Studies (GISS) within the GISS general circulation model (GCM). The chemistry in this model has...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2003-01-01
|
Series: | Atmospheric Chemistry and Physics |
Online Access: | http://www.atmos-chem-phys.net/3/1675/2003/acp-3-1675-2003.pdf |
id |
doaj-9614331429f747a19a5d4e56e075d970 |
---|---|
record_format |
Article |
spelling |
doaj-9614331429f747a19a5d4e56e075d9702020-11-25T00:46:40ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242003-01-013516751702Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCMD. T. ShindellG. FaluvegiN. BellImproved estimates of the radiative forcing from tropospheric ozone increases since the preindustrial have been calculated with the tropospheric chemistry model used at the Goddard Institute for Space Studies (GISS) within the GISS general circulation model (GCM). The chemistry in this model has been expanded to include simplified representations of peroxyacetylnitrates and non-methane hydrocarbons in addition to background NO<sub>x</sub>-HO<sub>x</sub>-O<sub>x</sub>-CO-CH<sub>4</sub> chemistry. The GCM has improved resolution and physics in the boundary layer, improved resolution near the tropopause, and now contains a full representation of stratospheric dynamics. Simulations of present-day conditions show that this coupled chemistry-climate model is better able to reproduce observed tropospheric ozone, especially in the tropopause region, which is critical to climate forcing. Comparison with preindustrial simulations gives a global annual average radiative forcing due to tropospheric ozone increases of 0.30 W/m<sup>2</sup> with standard assumptions for preindustrial emissions. Locally, the forcing reaches more than 0.8 W/m<sup>2</sup> in parts of the northern subtropics during spring and summer, and is more than 0.6 W/m<sup>2</sup> through nearly all the Northern subtropics and mid-latitudes during summer. An alternative preindustrial simulation with soil NO<sub>x</sub> emissions reduced by two-thirds and emissions of isoprene, paraffins and alkenes from vegetation increased by 50% gives a forcing of 0.33 W/m<sup>2</sup>. Given the large uncertainties in preindustrial ozone amounts, the true value may lie well outside this range.http://www.atmos-chem-phys.net/3/1675/2003/acp-3-1675-2003.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. T. Shindell G. Faluvegi N. Bell |
spellingShingle |
D. T. Shindell G. Faluvegi N. Bell Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCM Atmospheric Chemistry and Physics |
author_facet |
D. T. Shindell G. Faluvegi N. Bell |
author_sort |
D. T. Shindell |
title |
Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCM |
title_short |
Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCM |
title_full |
Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCM |
title_fullStr |
Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCM |
title_full_unstemmed |
Preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the GISS chemistry-climate GCM |
title_sort |
preindustrial-to-present-day radiative forcing by tropospheric ozone from improved simulations with the giss chemistry-climate gcm |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2003-01-01 |
description |
Improved estimates of the radiative forcing from tropospheric ozone increases since the preindustrial have been calculated with the tropospheric chemistry model used at the Goddard Institute for Space Studies (GISS) within the GISS general circulation model (GCM). The chemistry in this model has been expanded to include simplified representations of peroxyacetylnitrates and non-methane hydrocarbons in addition to background NO<sub>x</sub>-HO<sub>x</sub>-O<sub>x</sub>-CO-CH<sub>4</sub> chemistry. The GCM has improved resolution and physics in the boundary layer, improved resolution near the tropopause, and now contains a full representation of stratospheric dynamics. Simulations of present-day conditions show that this coupled chemistry-climate model is better able to reproduce observed tropospheric ozone, especially in the tropopause region, which is critical to climate forcing. Comparison with preindustrial simulations gives a global annual average radiative forcing due to tropospheric ozone increases of 0.30 W/m<sup>2</sup> with standard assumptions for preindustrial emissions. Locally, the forcing reaches more than 0.8 W/m<sup>2</sup> in parts of the northern subtropics during spring and summer, and is more than 0.6 W/m<sup>2</sup> through nearly all the Northern subtropics and mid-latitudes during summer. An alternative preindustrial simulation with soil NO<sub>x</sub> emissions reduced by two-thirds and emissions of isoprene, paraffins and alkenes from vegetation increased by 50% gives a forcing of 0.33 W/m<sup>2</sup>. Given the large uncertainties in preindustrial ozone amounts, the true value may lie well outside this range. |
url |
http://www.atmos-chem-phys.net/3/1675/2003/acp-3-1675-2003.pdf |
work_keys_str_mv |
AT dtshindell preindustrialtopresentdayradiativeforcingbytroposphericozonefromimprovedsimulationswiththegisschemistryclimategcm AT gfaluvegi preindustrialtopresentdayradiativeforcingbytroposphericozonefromimprovedsimulationswiththegisschemistryclimategcm AT nbell preindustrialtopresentdayradiativeforcingbytroposphericozonefromimprovedsimulationswiththegisschemistryclimategcm |
_version_ |
1725263831424303104 |