In:
Journal of Climate, American Meteorological Society, Vol. 30, No. 16 ( 2017-08), p. 6579-6584
Abstract:
In an influential and interesting study, Stevens (2015) suggested that the global and also Northern Hemispheric warming during the early industrial period implies that the effective radiative forcing [Formula: see text] by anthropogenic aerosols in the year 2000 compared to 1850 cannot be more negative than −1.0 W m −2 . Here results from phase 5 of the Coupled Model Intercomparison Project are analyzed and it is shown that there is little relationship between [Formula: see text] and the warming trend in the early industrial period in comprehensive climate models. In particular, some models simulate a warming in the early industrial period despite a strong (very negative) [Formula: see text] . The reason for this difference in results is that the global-mean log-linear scaling of [Formula: see text] with anthropogenic sulfur dioxide emissions introduced and used by Stevens tends to produce a substantially larger aerosol forcing compared to climate models in the first half of the twentieth century, when SO 2 emissions were concentrated over smaller regions. In turn, it shows smaller (less negative) [Formula: see text] in the recent period with comparatively more widespread SO 2 emissions.
Type of Medium:
Online Resource
ISSN:
0894-8755
,
1520-0442
DOI:
10.1175/JCLI-D-16-0668.1
Language:
English
Publisher:
American Meteorological Society
Publication Date:
2017
detail.hit.zdb_id:
246750-1
detail.hit.zdb_id:
2021723-7
