Hi Karl,
Thanks, that looks better. I was trying to stick close to existing patterns, but the outcome was a bit contrived and, I agree, not very satisfactory.
Sorry about the confusion, the two terms we need are:
fraction_of_rain_mass_falling_on_snow
fraction_of_snow_mass_falling_on_snow
However, I need to check with LS3MIP whether they intend "snowfall" to include snow and ice, as for the CMIP5 variable "prsn",
regards,
Martin
________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Karl Taylor <taylor13 at llnl.gov>
Sent: 31 May 2018 19:11
To: cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] Precipitation fractions for LS3MIP
Hi Martin,
For CMIP6, I think we define precipitation = rainfall + snowfall .
So do you want to collect "precipitation amount" or "rainfall amount"
(in addition to "snowfall amount")? You first mention "rainfall" below,
but later propose a name for "precipitation".
I also think it is a bit confusing that in this name "amount" refers to
the amount accumulated over some time-period (e.g., a day or a month),
rather than the total "content" that exists at a given point in time.
I might suggest as alternatives:
fraction_of_precipitation_mass_falling_on_snow
fraction_of_rain_mass_falling_on_snow
fraction_of_snow_mass_falling_on_snow
best regards,
Karl
On 5/31/18 9:56 AM, Martin Juckes - UKRI STFC wrote:
> Hello All,
>
>
> There are two LS3MIP variables for fractions of precipitation onto snow: fraction of rainfall on snow and fraction of snowfall on snow. In both cases the fraction is calculated as the mass of precipitation falling on snow divided by the total mass of precipitation in the grid cell.
>
>
> Since we are dealing with mass, the term should start from precipitation_amount and snowfall_amount.
>
>
> We have terms like lwe_thickness_of_precipitation_amount to describe properties of the precipitation amount, and we have precipitation_flux_onto_canopy do describe a flux onto a particular surface, so I propose:
>
> fraction_of_precipitation_amount_onto_snow and
>
> fraction_of_snowfall_amount_onto_snow, both with units '1',
>
>
> regards,
>
> Martin
>
>
>
>
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Received on Fri Jun 01 2018 - 00:42:45 BST
