Dear All: We (Gary Meehan and I) have been proposing some tropical cyclone related standard names in recent weeks. For several of the quantities, their value is a function of a specific threshold brightness temperature value at the top of atmosphere (i.e. toa_brightness_temperature) In one of tropical cyclone standard name related proposals (radius_of_tropical_cyclone_central_dense_overcast_region), we got feedback from Jonathan advocating the use of a "threshold" coordinate variable (i.e. air_temperature_threshold). The original definition inadvertently failed to mention that this is a brightness temperature rather than an air temperature, so the standard name " air_temperature_threshold" is not what is needed. We will need to propose a standard_name like "toa_brightness_temperature_threshold". Given this, the variable with standard_name of radius_of_tropical_cyclone_central_dense_overcast_region will have a coordinate variable whose standard_name is toa_brightness_temperature_threshold, and this coordinate variable will need a coordinate variable capturing the wavelength/frequency of the standard_name. The implication is that a coordinate variable has a coordinate variable. Is this ok ? I have included Jonathan's email below as a reference below. very respectfully, randy +++++++++++
Dear Gary In your new definition, the threshold is not stated, and I agree that it better in principle. However it would be informative to record the threshold used, I imagine. This could be done like this: > The average radius of a central region of clouds in tropical > cyclones lacking well-defined eye features > which is computed by averaging the great circle distance in four > cardinal directions. The radius > in each direction is measured from the estimated storm center > position to a warm point that exceeds > a threshold temperature limit. The threshold applied should be recorded in a coordinate variable having the standard_name of air_temperature_threshold. It could be a scalar or a size-one coordinate variable. Best wishes Jonathan
_______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
