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Comment
. 2011 Nov 15;108(46):E1099; author reply E1100-1.
doi: 10.1073/pnas.1114634108. Epub 2011 Nov 3.

Which of satellite- or model-based estimates is closer to reality for aerosol indirect forcing?

Johannes Quaas, Olivier Boucher, Nicolas Bellouin, Stefan Kinne
Comment

Which of satellite- or model-based estimates is closer to reality for aerosol indirect forcing?

Johannes Quaas et al. Proc Natl Acad Sci U S A. .
No abstract available

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Scatterplots and regression lines of ln Nc vs. ln AOD for North America, June-July-August (A); North America, December-January-February (B); and Asia, March-April-May (C). Daily instantaneous (green) and monthly mean (red) data from March 2000 through July 2006 MODerate Resolution Imaging Spectroradiometer (MODIS) data are shown, as in the report by Quaas et al. (2), as a 2.5° × 2.5° grid.
See this image and copyright information in PMC

Comment on

References

    1. Penner JE, Xu L, Wang M. Satellite methods underestimate indirect climate forcing by aerosols. Proc Natl Acad Sci USA. 2011;108:13404–13408. - PMC - PubMed
    1. Quaas J, Boucher O, Bellouin N, Kinne S. Satellite-based estimate of the direct and indirect aerosol climate forcing. J Geophys Res. 2008;113(D05204) 10.1029/2007JD008962.
    1. Lohmann U, Lesins G. Stronger constraints on the anthropogenic indirect aerosol effect. Science. 2002;298:1012–1015. - PubMed
    1. Quaas J, Boucher O, Lohmann U. Constraining the total aerosol indirect effect in the LMDZ and ECHAM4 GCMs using MODIS satellite data. Atmos Chem Phys. 2006;6:947–955.
    1. Andreae MO. Correlation between cloud condensation nuclei concentration and aerosol optical thickness in remote and polluted regions. Atmos Chem Phys. 2009;9:543–556.

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