New study on cloud albedo enhancement
Wil Burns
- Changes in cloud drop number concentration (CDNC) were small (20% or less), and in one of the four regions studied (North Pacific, as well as off the coast of Chile), even negative. The authors argue this was attributable to the fact that particles suppress in-cloud supersaturation, preventing existing aerosol particles from forming cloud drops;
- A run with 5x higher emissions showed much greater CDNC changes, but the median was still below that found in previous studies;
- The study showed substantial differences in CDNC between and within regions, in distinction to far more regional homogeneity in previous studies
It would be interesting to hear the take of some of the folks on this list with expertise in this context. wil
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Dr. Wil Burns, Editor in Chief
Journal of International Wildlife Law & Policy
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Stephen Salter
I am puzzled by the difference between the numbers for cloud drop number
concentration of 171 and 133/cm3 for the Pacific in table 1 of the
Korhonen, Carslaw an Romakkaniemi paper and the 40 to 67/cm3 given by
Bennartz and the even lower values for many regions shown in the map by
Rob Wood. The Bennartz paper and Rob's map are attached. Could it be
that there is a bias due to data from short range aircraft?
We must remember that the change of reflectivity has a log response so
it is much easier if you start with clean air.
Stephen
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Wil Burns wrote:
> For those of you haven't seen this yet, there's an interesting recent
> study in Atmospheric Chemistry & Physics
> (http://www.atmos-chem-phys.net/10/4133/2010/acp-10-4133-2010.pdf)
> assessing the impacts of marine cloud albedo enhancement using a
> global aerosol transport model. Among the takeaways from the study:
>
> * Changes in cloud drop number concentration (CDNC) were small
> (20% or less), and in one of the four regions studied (North
> Pacific, as well as off the coast of Chile), even negative. The
> authors argue this was attributable to the fact that particles
> suppress in-cloud supersaturation, preventing existing aerosol
> particles from forming cloud drops;
> * A run with 5x higher emissions showed much greater CDNC changes,
> but the median was still below that found in previous studies;
> * The study showed substantial differences in CDNC between and
> within regions, in distinction to far more regional homogeneity
> in previous studies
>
>
> It would be interesting to hear the take of some of the folks on this
> list with expertise in this context. wil
>
> --
> Dr. Wil Burns, Editor in Chief
> Journal of International Wildlife Law & Policy
> 1702 Arlington Blvd.
> El Cerrito, CA 94530 USA
> Ph: 650.281.9126
> Fax: 510.779.5361
> ji...@internationalwildlifelaw.org
> <mailto:ji...@internationalwildlifelaw.org>
> http://www.jiwlp.com
> SSRN site: http://ssrn.com/author=240348
> Skype ID: Wil.Burns
>
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