[gradsusr] mysterious bug with merra-2 data

[Jennifer M Adams]

Try setting your tdef to be at 00z instead of 00:30z. 
—Jennifer

> On Mar 2, 2018, at 9:11 AM, Antoine Molin <amolin at plenr.fr> wrote:
> 
> Hi,
>  
> I am using merra-2 data U&V wind speeds at 50m, for wind energy studies in France ; very good data…..
>  
> Getting « MERRA2_400.tavg1_2d_slv_Nx.%y4%m2%d2.SUB.nc4»  daily files, data are obtained with grads, using xdfopen and enclosed data descriptor files.
>  
> I really don’t understand why i get different values with different descriptor files, for same point and time :
>  
> As an example, at point (49°N ; 4.375°E) and time  2017-12-01 at 0h,  i get U50m=5.31 m/s using « merra2_dec2017.ctl »  (lat = 49, lon = 4.375, t = 1), and U50m=5.22 m/s using « merra2_2017.ctl »  (lat = 49, lon = 4.375, t=8017)…..
>  
> Why ????????????????
>  
> Thanks !
>  
>  
> Antoine Molin
> Etudes de vent PlenR
> Tel : 03 20 47 99 76
>  
> <Merra2_dec2017.ctl><Merra2_2017.ctl>_______________________________________________
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Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University