In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 18, No. 2 ( 2018-01-29), p. 1091-1114
Abstract:
Abstract. Ozone fields simulated for the first phase of the Chemistry-Climate Model
Initiative (CCMI-1) will be used as forcing data in the 6th Coupled Model
Intercomparison Project. Here we assess, using reference and sensitivity
simulations produced for CCMI-1, the suitability of CCMI-1 model results for
this process, investigating the degree of consistency amongst models
regarding their responses to variations in individual forcings. We consider
the influences of methane, nitrous oxide, a combination of chlorinated or
brominated ozone-depleting substances, and a combination of carbon dioxide
and other greenhouse gases. We find varying degrees of consistency in the
models' responses in ozone to these individual forcings, including some
considerable disagreement. In particular, the response of total-column ozone
to these forcings is less consistent across the multi-model ensemble than
profile comparisons. We analyse how stratospheric age of air, a commonly
used diagnostic of stratospheric transport, responds to the forcings. For
this diagnostic we find some salient differences in model behaviour, which may
explain some of the findings for ozone. The findings imply that the ozone
fields derived from CCMI-1 are subject to considerable uncertainties
regarding the impacts of these anthropogenic forcings. We offer some
thoughts on how to best approach the problem of generating a consensus ozone
database from a multi-model ensemble such as CCMI-1.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-18-1091-2018
DOI:
10.5194/acp-18-1091-2018-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2018
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1