[gradsusr] Fw: coverting daily time series to monthly

[ugo okoro]

Dear Roger,
i want to compute the vertically integrated moisture transport over lon (25W - 15E) 
and lat (0 - 20N) at selected years (say 1994,1999,2003 and 2008 from NCEP monthly)
using this script i saw online from you; 

'sdfopen file-pressure.nc'
'sdfopen file-zonal-wind.nc'
'sdfopen file-meridional-wind.nc'
'define QiJAN=ave(vint(prmsl.1(z=1)/100,shum.1*uwnd.2,200),t=((t=181)+(t=241)+(t=289)+(t=349))'
'define QjJAN=ave(vint(prmsl.1(z=1)/100,shum.1*vwnd.3,200),t=((t=181)+(t=241)+(t=289)+(t=349))'
'set gxout vector'
'd QiJAN;QjJAN' but i dont get some details from the script-
1. is msl the pressure data?
2. is shum the specific humidity?
3. will my time be the problem with the script?

Thanks in anticipation.

ugo okoro
cmsr, iap-cas,
beijing
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