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Interpreting the cloud cover - aerosol optical depth relationship found in satellite data using a general circulation model

Interpreting the cloud cover - aerosol optical depth relationship found in satellite data using a general circulation model,10.5194/acpd-9-26013-2009,

Interpreting the cloud cover - aerosol optical depth relationship found in satellite data using a general circulation model   (Citations: 2)
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Statistical analysis of satellite data shows a positive correlation between aerosol optical depth (AOD) and total cloud cover (TCC). Here we compare the slope of the linear regression between the logarithm of TCC and the logarithm of AOD, or the strength of the relationship, as derived from three satellite data sets to the ones simulated by a global aerosol-climate model. We analyze model results from two different simulations with and without a parameterization of aerosol indirect effects, and using dry compared to humidified AOD. We find that none of the hypotheses discussed in the literature is able to uniquely explain the positive relationship. The most important contribution in the model is from the swelling of aerosol in the vicinity of clouds, where relative humidity is high. The model also shows contribution of the aerosol cloud lifetime effect to the positive relationship, which, however, is of lesser importance.
Journal: Atmospheric Chemistry and Physics Discussions , vol. 9, no. 6, pp. 26013-26027, 2009
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    • ...Because many other factors act on the cloud life cycle, a quantitative estimate of the aerosol impact may be possible in a statistical sense only, which implies the use of a great number of data, which are uniquely provided by satellite retrievals [Nakajima et al., 2001; Bréon et al., 2002; Sekiguchi et al., 2003; Kaufman et al., 2005; Quaas et al. ,2 006;Storelvmo et al., 2006; Quaas et al., 2009]...
    • ...Indeed, there is no clear evidence that the huge amount of observations [Quaas et al., 2009] which link an increase of aerosol load to an increase of cloud albedo and an increase of cloud lifetime are strictly connected by a cause‐effect relationship...

    Lorenzo Costantinoet al. Analysis of aerosol-cloud interaction from multi-sensor satellite obse...

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