
  %On the Antarctic Ozone Hole, correction sheet (vancouversheet.tex)
  %by M.\ E.\ McIntyre.  J. Atmos. Terrest. Phys. 51, 29--43.
  %(Further comments, criticisms, etc., welcome at
  % M.E.McIntyre@amtp.cam.ac.uk) Updates from anonymous ftp,
  %same as for my writing-and-pattern-recognition essay and notes
  %(use ftp ftp.amtp.cam.ac.uk; give login name anonymous; give email address;
  %cd pub/papers/mem; get writpatt.tex).

  %This sheet substantially as first circulated in 1989, with refs updated.
  %In plain TeX:

\magnification \magstephalf
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\hoffset=-0.5cm \voffset=-1cm
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Notes and minor corrigenda for the Vancouver IUGG paper `On the Antarctic ozone
hole' (J.\ Atmos.\ Terrest.\ Phys., {\bf 51}, 29-43, 1989), from Michael
McIntyre.   \hfill {\sevenrm [[vancouversheet.tex}


This paper tries to assemble and summarize what I was trying to say at the
19th IUGG General Assembly at Vancouver in August 1987.  The publication date
should have been 1988 -- and I was so informed by the publishers -- but it has
turned out to be January 1989!  I apologize to those to whom I told the
incorrect date.


{\bf Page 31b, line 5}: Delete ``and temperature changes''.  I forgot about
non-Newtonian radiative transfer.
The statement is true of Newtonian cooling models only.


{\bf Page 31b, principle (5)}: The PV `impermeability theorem' and its
implications are further discussed in a note
by Haynes and myself to be submitted to J.\ Atmos.\ Sci.,* being partly a reply
to the recent preprint circulated by Ed Danielsen.  There appears to be a
belief that the total amount of `PV substance' above an isentropic surface
like the 350K or 400K surface can be changed, for instance by turbulent
entrainment across the 400K surface.  The impermeability theorem is one way of
seeing that this cannot be true; the relationship between PV and circulation
is another.


{\bf Page 31b}, paragraph above Eq.(1): I now think the bit in parentheses is
slightly overstated; it has yet to be determined how far we can usefully push
detailed applications of the downward control principle in vortex-following
coordinates.  The calculations in the relevant Haynes {\it et al.} paper\dag\
have shown that, although the principle is
extremely robust at global circulation scales, the opposite is true at length
scales less than about $10^{3}$ km, more precisely the Rossby length
$NH_\rho/f$
associated with the density scale height $H_\rho$.  In particular, the statement at the
end of section 2 of this paper (the Vancouver one), about the adjustment
timescale, is true only on the larger scales.  However, the conclusions 
are not significantly affected.


{\bf Page 33, grayscale pictures}: the vortex interior should be black; the
pieces of light coloured `straw' were introduced by the printers.


{\bf Page 36a, line 22}: This should read ``vortex is disturbed'', not
``vortex is distributed''.  The latter was invented by the sub-editors or
printers after proof corrections.  They also invented some bad punctuation in
a number of places; the worst ones are the insertions of commas after ``an
early spring evolution'' on page 38b, line 6, and after ``50K'' on page 41b
item (4) line 9, both of which slightly change the meaning from that intended.
I apologize for these.


{\bf Page 40, figure 9}: I could have remarked on what does, perhaps, look
like a downward trend in the November temperatures at 100mb.  That might well
be the radiative effect of ozone depletion discussed for instance by Shine 1986
(GRL {\bf 13}, 1331) and by Kiehl and Boville 1988 (J.\ Atmos.\ Sci.\ {\bf
45}, 1798.)


{\bf Page 41b, end of item (3)}: It now seems very clear from the AAOE and
AASE data and from cloud modelling that the ``dynamically induced
intravortical temperature fluctuations'' are actually of great importance for
chemical processing.  This has been cogently argued, in particular, by Tuck
{\it et al.} in the forthcoming JGR Snowmass Issue.\ddag


{\bf Page 41b, item (4)}: The `deep enough' refers of course to principle 3,
page 31.  (I could never understand why this simple and well known principle,
a corollary of the Eliassen theory, was not made more use of in discussions of
the so-called `dynamical', or diabatic upwelling theories, when those theories
were under consideration.)


{\bf References :}
My noctilucent cloud paper, which discusses a nice illustration of the
downward-control principle from a recent modelling study by Garcia, is now
coming out together with Garcia's paper later this year (JGR special NLC
issue).\P\  The Sommeria {\it et al.} paper is already out in Nature {\bf 337},
58-61 (1989).  See their figure 1e for some striking laboratory evidence in
favour of the vortex isolation hypothesis (and therefore against the usual
eddy-diffusivity or flux-gradient hypothesis).  I plan to say more about the
problems with that hypothesis at the IAMAP Reading meeting this
summer.\S

\smallskip

\font\sbf=cmbx7

{\sevenrm
*JAS {\sbf 47}, 2021--2031.  %PV evol'n
\hfil
\dag JAS {\sbf 48}, 651--678.  %``Downward control'' paper
\hfil
\ddag JGR {\sbf 94}, 11687--11737.  %Tuck
\hfil
\P JGR {\sbf 94}, 14617--14628.  %NLC
\break
\S\ Final version appeared in:
Dynamics{,} Transport and Photochemistry in the Middle
Atmosphere of the Southern Hemisphere (NATO ASI C-{\sbf 321}, 1990,
ed. A. O'Neill, Kluwer), 1--18.}  %San Francisco Workshop

\bye

