Index Home About Blog
From: bobg@Radix.Net (Robert Grumbine)
Newsgroups: sci.environment
Subject: Re: Warmest Spring on Record
Date: 10 Jul 2000 11:50:22 -0400

In article <1FI95.2789$>,
Ian St. John <> wrote:
>I wish that you would clarify one point for me? Why would *ground level*
>smog ( from coal plants) reduce air temperature? I can see stratospheric
>particulates doing so by blocking sunlight, but ground level smog would just
>transfer the heat from the smog particle instead of ground soil particles.
>Additionally, the small particle size and distribution ought to make energy
>capture more efficient ( lower albedo) and dust on normally high albedo
>areas, such as snow cover, ought to exacerbate the problem, not solve it.

  It looks like the matter of how the aerosols work has been mentioned,
but not the initial problem: how to get from ground to stratosphere.
The coal burning is done near the surface, and the exhaust plume doesn't
extend more than a km or two up from surface.  So getting the exhaust
from 1 km to 12 km is a challenge.  The way it works is that the exhaust
is sulfur-bearing _gas_.  The gas can diffust through the atmosphere ok.
In time, it is possible for the sulfur-bearing gas molecules to combine
with enough others to create solid particulates.  The particulates then
behave as described.

Robert Grumbine Science faqs and amateur activities notes and links.
Sagredo (Galileo Galilei) "You present these recondite matters with too much
evidence and ease; this great facility makes them less appreciated than they
would be had they been presented in a more abstruse manner." Two New Sciences

Index Home About Blog