Hi there folks..
I'm trying to generate a file containing linear trends over specified periods (nominally 1960-2008) which are scaled to represent a linear trend for 50 years.
A first crack at this file, and a corresponding header dump can be found at:
http://www.marine.csiro.au/~dur041/100709_LinearChange.txt
I'm a little confused how best to represent this, as I'm uncertain how to correctly create a simple climatology (mean values over a specified period) and the associated time dimension/attribute, let alone their perturbation fields, honouring the CF-1.4 conventions.
I have generated such a file and run this against the CF-1.4 compliance checker, and aside from some general errors regarding syntax of standard_name attributes, have hit some troubles with units etc.. In particular, the changes represent units: degree_C/50Yrs, however this is not a valid unit in CF-1.4:
------------------
Checking variable: thetao_change
------------------
ERROR (3.3): Invalid syntax for 'standard_name' attribute: 'linear_potential_temperature_change_1960-2008'
ERROR (3.1): Invalid units: degree_C/50Yrs
The standard_name attributes indicate a simple syntax issue (I'm using a "-" value to represent the time period over which the linear trend is calculated):
------------------
Checking variable: soi
------------------
ERROR (3.3): Invalid syntax for 'standard_name' attribute: 'southern_oscillation_index_regression_1960-2008'
I wonder if there is another variable attribute that I should set which expresses the years over which the regression was undertaken, and remove the "1960-2008" from the standard_name.
I'd appreciate some pointers how to best create this file, best conforming with CF-1.4.
Cheers,
Paul
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Paul J. Durack
PhD Candidate (CSIRO/UTas - QMS)
CSIRO Marine and Atmospheric Research
GPO Box 1538
Hobart TAS 7001
Telephone: +61 (3) 6232 5283
Mobile: +61 (0) 408840428
Email: Paul.Durack at csiro.au
Web:
http://www.cmar.csiro.au/
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Received on Thu Jul 08 2010 - 22:44:49 BST
