cc: wigley@ncar.ucar.edu date: Sun, 8 Nov 1998 21:01:03 -0700 (MST) from: Tom Wigley subject: Re: global land precip. to: Mike Hulme Mike, Many thanks for the precip. data. When I compared the mm(sd) column with IPCC Fig. 3.11 (top panel) I found big differences in the individual annual values (plus IPCC only goes to 1994). Have you improved things? IPCC says that there is a 1% increase overall, which is clearly garbage. The apparent rend depends on the years before 1915: surely these are less reliable and represent poorer coverage? By the way, what paper can I cite for these data? Cheers, Tom, On Thu, 5 Nov 1998, Tom Wigley wrote: > Mike, > > I didn't get the attachment. Can you try again please? > > Thanx, > Tom > > On Thu, 5 Nov 1998, Mike Hulme wrote: > > > Tom, > > > > Attached is an output file from my regional precip. program. This contains > > annual precip. anomalies (wrt 1961-90) for global land areas derived from > > my 1900-1996 gridded (on HadCM2 grid) precip. dataset. > > > > The first block of data are diagnostics for the 1496 boxes contributing. > > > > The time series at the end of the file are for 1900-96 and show various > > methods of calculating anomaly series for precip. (see Jones and Hulme > > paper in IJC, 1996). > > > > The one is prefer is column 5 mm(sd) which are mm anomalies from the > > 1961-90 weighted mean of 989 mm. Column 2 are the number of boxes > > contributing each year. Column 3 is the conventional standardised anomaly > > index. > > > > These data are equivalent to those shown in Figure 3.11 (top panel) in IPCC > > 1996. There are only three such series in existence to my knowledge - > > mine, Dai et al. and the one from Karl/Peterson. Dave Easterling showed > > the latest version of their's at a recent meeting in Vienna so I know > > he/Tom have one. Dai has also published a version (JoC 1997), but this was > > based on inferior data and used a different (less robust) method. > > > > Regards, > > > > Mike > > > > > > > > > > > ********************************************************** > *Tom M.L. Wigley * > *Senior Scientist * > *National Center for Atmospheric Research * > *P.O. Box 3000 * > *Boulder, CO 80307-3000 * > *USA * > *Phone: 303-497-2690 * > *Fax: 303-497-2699 * > *E-mail: wigley@ucar.edu * > ********************************************************** > > ********************************************************** *Tom M.L. Wigley * *Senior Scientist * *National Center for Atmospheric Research * *P.O. Box 3000 * *Boulder, CO 80307-3000 * *USA * *Phone: 303-497-2690 * *Fax: 303-497-2699 * *E-mail: wigley@ucar.edu * **********************************************************