<DIV>Dear Users,</DIV>
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<DIV>I need to calcualte the average moisture flux at the level 500 hPa over a period of time. I calculated the mean values for 1969 and 1972, respectively, but it seemed that there is no difference between the two years. I don't know why it is. Can anyone please give me a help?</DIV>
<DIV>Thanks in advance.</DIV>
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<DIV> The gs file for calculating average moisture flux of 1969 is as following:</DIV>
<DIV>'reinit'<BR>'set grid off'<BR>'set grads off'<BR>'set poli on'<BR>'set parea 1 10 1 8'<BR>'sdfopen shum.mon.mean.nc' <BR>'sdfopen uwnd.mon.mean.nc' <BR>'sdfopen vwnd.mon.mean.nc'<BR>'sdfopen pres.mon.mean.nc'<BR>'set lat 30 90'<BR>'set xlint 40'<BR>'set lon -160 -40'<BR>'set ylint 30'<BR>'set mpdset cnworld mres'<BR>'set map 1 1 1'<BR>'draw map'<BR>'print'<BR>'disable print'<BR>'enable print flux69.gmf'<BR>'set gxout shaded'<BR>'set ylopts 1 4 0.1'<BR>'set xlopts 1 4 0.1'<BR>'set cint 0.5'<BR>*'set ccols 9 14 4 11 5 13 3 10 7 12 8 2 6'<BR>'set ylopts 1 4 0.1'<BR>'set xlopts 1 4 0.1'<BR>'set arrowhead 0.05'<BR>*'set arrscl'<BR>'set lev 500'<BR>'define qu=shum.1*uwnd.2'<BR>'define qv=shum.1*vwnd.3'<BR>'define aqu=ave(qu,t=253,t=264)'<BR>'define aqv=ave(qv,t=253,t=264)'<BR>'define uv=ave(mag(qu,qv),t=253,t=264)'<BR>'d mag(qu,qv)'<BR>'d aqu;aqv'<BR>'set arrscl 0.1 50'<BR>'set arrowhead 0.2'<BR>'run cbar.gs'<BR>'set gxout contour'<BR>'print'<BR>'disable print'</DIV>
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