Changes between Version 30 and Version 31 of Branches/Driver_Improvements


Ignore:
Timestamp:
2016-05-27T18:32:17+02:00 (8 years ago)
Author:
aducharne
Comment:

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  • Branches/Driver_Improvements

    v30 v31  
    6565'''AD(27/05/2016): I disagree with the above statement that motivates the development of a new interpolation method''' : "The time-stepping is done independently from the physical time. [...] The issue becomes more complicated when we consider fluxes which are averaged over an interval. The only valid assumption is that the dates corresponding to index itau_n is within the time interval over which the average was performed. In readim2.f90 there is no information if the date of n is at the start, end or anywhere else within the averaging period."  
    6666 
    67 First, the time is defined without ambiguity from the initial time and the nb of records that were read.  Second, when we read a flux at the record itau_n, we perfectly know to which interval it corresponds. For WFDEI for instance, we know from http://www.eu-watch.org/gfx_content/documents/README-WFDEI%20(v2016).pdf that the record at itau_n holds the average flux over the 3-hourly period that precedes the "time stamp" of itau_n (t0+dt according to the above notations). This is perfectly clear, perfectly coherent with the first panel of the above graphic, and tractable by dim2driver with the good values of inter_lin and netrad_cons. 
     67First, the time is defined without ambiguity from the initial time and the nb of records that were read.  Second, when we read a flux at the record itau_n, we perfectly know to which interval it corresponds. For WFDEI for instance, we know from http://www.eu-watch.org/gfx_content/documents/README-WFDEI%20(v2016).pdf that the record at itau_n holds the average flux over the 3-hourly period that precedes the "time stamp" of itau_n ([t0,t0+dt] according to the above notations). '''It does not mean that LW(itau_n) is only "valid" at one instant over [t0,t0+dt]''' as suggested above. This is perfectly clear, perfectly coherent with the first panel of the above graphic, and tractable by dim2driver with the good values of inter_lin and netrad_cons. 
    6868 
    6969It further means that, whichever the interpolation we perform, for WFDEI case, the average of the interpolated flux over the 3h that precede t0+dt must equal the value read in record itau_n. It thus implies that any interpolation that does not preserve the mean over [t0,t0+dt] is inappropriate for such a flux.