date: Wed, 14 Jul 1999 13:54:30 +0000 from: Sir John Houghton subject: tar ch 13 draft 0 comments to: tar13@meto.gov.uk TO LINDA MEARNS AND MIKE HULME FROM JOHN HOUGHTON PLEASE SEE COMMENTS ON ZERO DRAFT OF CH 13 o The chapter presents useful and helpful background information and assessment for those employing or wishing to employ climate scenarios. o The chapter would be more readable if it were shorter and punchier -many of the sentences are more complicated -or convoluted - than they need be. o Can there be more emphasis on climate extremes and how appropriate scenarios for these can be provided? There is quite a bit on climate variability but it is the extremes –how their intensity and frequency might change - that provide the greatest impact. o There is significant overlap with chapter 10 esp for instance in 13.4 which can probably be significantly shortened by reference to ch 10. o The chapter contains a few examples. But it would be much more interesting, readable and useful if there were more examples (say 2 well chosen ones) of climate scenarios and their use. -- -------------------------------------------- Sir John Houghton IPCC WGI Co-chair Hadley Centre Met Office London Road Bracknell Berks, RG12 2SY Email: jthoughton@ipccwg1.demon.co.uk http://www.ipcc.ch ---------------------------------------