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    The World Is Getting Cooler*
    By Patrick Lockerby | May 6th 2013 08:46 AM | 1 comment | Print | E-mail | Track Comments
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    Retired engineer, 60+ years young. Computer builder and programmer. Linguist specialising in language acquisition and computational linguistics....

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    The World Is Getting Cooler*

    *  Not!

    This is something of a pre-emptive strike against the quote miners of this world.  I predict that they will use a new study of cloud seeding to sell ice damage insurance or something.

    If you sprinkle a cup of water on a bonfire it will have a tiny cooling effect.  It will not put out the fire or wishomagically reverse the heating effect.  Scientists know exactly what they mean by a cooling effect, and so does everyone who ever used a cooling fan in summer.  But there are some snake oil salesmen who want to convince you that a simple cooling fan can lower the air temperature.

    A new study on clouds demonstrates a cooling effect.  Most of us know what that means.  For those who don't, let me explain as subtly as I can:

       THE WORLD AIN'T COOLING, STUPID!

    “We suggest that the co-condensation of semi-volatile organic compounds with water vapour has a substantial impact on the radiative properties of clouds.”

    From the abstract - see below.

    A cooling effect is mentioned by the World Meteorological Organisation in its announcement of a new  Statement on the Status of the Global Climate :
    “We need to understand how much of the extra heat captured by greenhouse gases is being stored in the oceans and the consequences this brings in terms of ocean acidification and other impacts. We need to know more about the temporary cooling effects of pollution and other aerosols emitted into the atmosphere. We also need a better understanding of the changing behaviour of extreme weather and climate events as a consequence of global warming, as well as the need to assist countries in the most affected areas to better manage climate-related risks with improved climate early warning and climate watch systems,” said Mr Jarraud.

    Got that?  It's not "Wow! The planet is cooling down, stop climate research worrying."  It's a cooling effect and it's temporary.


    The new study on clouds, from Nature Geoscience



    Clouds profoundly influence weather and climate. The brightness and lifetime, of clouds is determined by cloud droplet number concentration, in turn dictated by the number of available seed particles. The formation of cloud droplets on non-volatile atmospheric particles is well understood. However, fine particulate matter in the atmosphere ranges widely in volatility. Co-condensation of semi-volatile compounds with water increases a particle’s propensity for cloud droplet formation, with potential consequences for feedbacks between the terrestrial biosphere and climate. Here we systematically study cloud droplet formation, using a cloud parcel model extended to include co-condensation of semi-volatile organic compounds under a broad variety of realistic conditions. As an air parcel rises and cools, the concentration of organic vapour that it can hold declines. Thus, the simulated organic vapours become increasingly saturated as they ascend, and so condense on growing particles as they swell into cloud droplets. We show that condensation of increasingly volatile material adds to the soluble mass of these droplets and facilitates the uptake of additional water, which leads, in turn, to a substantial increase in the number of viable cloud droplets. We suggest that the co-condensation of semi-volatile organic compounds with water vapour has a substantial impact on the radiative properties of clouds.

    Cloud droplet number enhanced by co-condensation of organic vapours
    David Topping,   Paul Connolly  and Gordon McFiggans
    Nature Geoscience (2013)  doi:10.1038/ngeo1809
    Note to editors:
    A copy of the Nature Geoscience paper, ‘Cloud droplet number enhanced by co-condensation of organic papers,’ by Gordon McFiggans et al, is available on request.  Follow link below for contact details:
    Faculty of Engineering and Physical Sciences
    The University of Manchester

    Comments

    logicman
    ... the quote miners of this world.  I predict that they will use a new study of cloud seeding to sell ice damage insurance or something.

    I was expecting a flood of badly written reports about this.  There have been a few badly slanted headlines, but the actual reporting errors I have seen have been fairly trivial.

    Except for Cheryl K. Chumley who writes in the Washington Times:

    Scientists hint that global cooling is the new pollution risk

    Just in time for the cooler spring that has swept the nation — complete with unseasonal snow in the Rockies region — scientists with the University of Manchester said pollution actually brings on climate cooling, not warming.
    Scientists with the University of Manchester did not say: "pollution actually brings on climate cooling".


    And what on Earth is meant by: " ... global cooling is the new pollution risk".

    Purest woo !