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[CF-metadata] Precipitation fractions for LS3MIP

From: Karl Taylor <taylor13>
Date: Thu, 31 May 2018 11:11:27 -0700

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 Thu May 31 2018 - 12:11:27 BST

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