Discussion with Eldbjørg and Tor-Ivar

tomaloki / 2024_msc_tonje_metar

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Discussion with Eldbjørg and Tor-Ivar #4

Open tomaloki opened 8 months ago

tomaloki commented 8 months ago

Disscuss the talked-about parameters for the dataset

their thoughts on the suggested parameters
their thoughs on threshold values for each --> what specific combination indicates icing
what conditions (param values) does definitely not indicate icing contidions

Suggested params from me:

Temperature: _air_temperature0m, _air_temperature2m
Dewpoint: none
Relative humidity: _relative_humidity2m and _relative_humitidypl
Wind: _xwind, _ywind, _x_wind10m, y_wind_10m
Skyvann: is we_thickness_of_atmosphere_mass_content_of_water_vapor relevant? If not, what other param?
Precipitation: _precipitation_amountacc

Thoughts on:

_sltitude_of_0_degreeisotherm
_geopotentialpl
_surfacegeopotential
_air_pressure_at_sealevel
_surface_airpressure
Ask about FZUP (freezing unidentified precipitaion) and how this should be handled

tomaloki commented 8 months ago

Engaged in a chat with Eldbjørg and Tor-Ivar, updating this issue as soon as I hear from them.

tomaloki commented 8 months ago

From Eldbjørg:

" Forsøk på svar på deler av det du spurte om: Jeg er litt usikker på hva du har tilgang til av datasett, men når vi vurderer ising, så har vi tradisjonelt sett en del på "isingindeksen" kalt Icing-Index-Layer og Icing-Index-Max(MOD ICE > 2,5 cm/h, SEV ICE > 7,5 cm/h). Disse gir indikasjoner om det er ising, men parameterne er i enkelte tilfeller ganske dårlige. Det som kanskje gir en bedre indikasjon om det er ising er Liquid Water Content (LWC). Dette kan vi også se på i Diana. Her har vi som utgangspunkt grensene MOD ICE > 0,25 g/m³, SEV ICE > 0,60 g/m³. Eirik er eksperten på dette, men skjønte han var i permisjon nå."

tomaloki commented 8 months ago

Tor-Ivar sent diana.setup. config file for Diana containing all the exisintg params in addition to params with ensembles.

Suggested to look more into undercooled rain og freezing rain, since I am currently only looking at freezing incidents on ground level. Also suggests fog parameters, T0m, T2m RH/Td close to the ground.

tomaloki commented 8 months ago

Tor-Ivar suggested a meeting in February where we could talk about it together + I could show what I have so far. Maybe they can attend one of the weekly Wednesday meetups, so that we are all together?