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[ferret_users] error converting monthly to yearly values

Dear Ferret users,

I am trying to convert monthly fields to yearly fields by defining axis of 360 calender days

define axis/t=1-jan-1979:30-dec-2010:12/unit=month/cal=360_days/edges tax

let yr = mn[gt=tax@ave]

This seems to be much closer than other approach, still there is a difference if i check the values by averaging every alternate 12 records or by using CDO.

Is there any other efficient way to make it more reliable

Thanks in advance

Samir Pokhrel

Climate and Global Modelling Division
Indian Institute of Tropical Meteorology
NCL Post, Pashan

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