Questions tagged [wrf]
The Weather Research & Forecasting Model
48
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Which way is the more computationally efficient for running WRF-Chem with one way nesting: (a) by setting feedback to '0' or (b) using ndown.exe?
I want to run WRF-Chem with one-way nesting because of the limitations of my system (a linux server with 378 GB of RAM and 32 processors). I have gone through the WRF user guide, which explained how ...
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Can historical emissions data be used for a future WRF-Chem model run?
I am new to running the WRF-Chem model, so this question maybe a little elementary. I wanted to perform an year-long simulation of certain chemical species for 2019 and for that, is it sufficient to ...
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Is spin-up really required to run the WRF-Chem model and if so, what determines the time period of the spin-up?
For example, I am interested in making a simulation for some chemical species for 2019. I am planning to provide NCEP/GDAS FNL meteorological data at 0.25 degree and CAM-Chem chemical boundary layer. ...
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Calculating layer thickness in python
I have calculated the $∂θ_\varepsilon/∂z$ with 'Height', 'Latitude', 'Longitude' dimensions.
...
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Why are all the variables ( DRY_DEP_FLUX and WET_DEP_FLUX) zero in a wrf model output in all the time steps
I am working on WRF_GHG, I would like to calculate dry and wet deposition in the dry and wet seasons for CO2 and CH4 gases. However, when I check the wrf output, I see that all the variables (...
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How to find the top level of the planetary boundary layer in WRF?
I am working on WRF_Chem, I would like to calculate the concentration of CO2 just in the Planetary boundary layer(I mean, I want to calculate CO2 from surface to top of PBL).in WRF How can I calculate ...
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regeride netcdf file to template netcdf file resoulution
how can I regrid my NetCDF file into another NetCDF file resolution?
change the file number 1 or 2 or 3 (file1.nc,file2.nc,file3.nc ) into resolution template file (wrfinput_d01.nc) . I have attached ...
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wrf_chemi file with 30 time steps
I creat wrfchemi file for my wrf-chem, my wrfchemi file has 30 time step,
frames_per_auxinput5 = 30, 30,
auxinput5_inname = "wrfchemi_d",
auxinput5_interval_m = 60, 60,
...
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Wind speed data plot contains blank gaps
I am relatively new to Python, and I am having trouble plotting some data. Specifically, I am plotting wind speed data on a 2-D plot that I grabbed from the Weather Research & Forecasting (WRF) ...
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Providing Edgar emission using prep_chem_source for tracers (CO2-CH4)
I am working on CO2 and CH4 by WRF-CHEM, for providing my anthropogenic emission from Edgar data base, I'm going to use the Prep_chem_source App.
I would like to use Edgar data emission (as my ...
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Wind rose WRF-PYTHON
I'm trying to plot a windrose but I don't know how to get the variables ws and wd. Is there any variable in the wrf output that can be used to make a windrose?
I tried with 'wspd' et 'wdir' but I ...
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Longitudes and latitudes are not regular in WRF-out files
I am working by WRF-ouput files (wrfout_d01_2016-01-16_00:00:00).
I extracted and printed latitude and longitude data from the "wrfout_d01_2016-01-16_00:00:00", ...
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How to de-stagger (or unstagger) WRF wind fields?
I am trying to calculate wind speed from the U and V wind components of a Weather Research and Forecasting (WRF) simulation. However, I came to realize that some ...
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Does WRF simulation use sigma or eta vertical coordinate system?
Could you tell me what the WRF's vertical coordinate system is? Sigma or eta?
According to the User WRF Guide document, uses a terrain-following hydrostatic pressure coordinate while the WRF ...
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Spatial allocation of road emissions and unit conversion
I have a grid shapefile that has a resolution of 1km x 1km.
This grid is then used to spatially allocate road emissions.
My goal is to get the emissions in the unit: μg m-2 s-1(microgram per ...
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WRF/Chem: Editing NetCDF (wrfchemi files) for own emissions
Does anybody here have any experience with editing wrfchemi outputs from the prep_chem utility so that I overwrite the file with my own emissions?
I am knowledgeable in python, but I am not that well ...
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How to control output precision when running WRF?
I am very new in this area and wondering if anyone can answer my following questions:
I am running WRF (4.0.3, ideal) to study rounding and truncation. I use the NCL (6.5.0) print command to access ...
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run the WRF model using ERA5
I want to run wrf chem with ERA 5. I followed this post https://dreambooker.site/2018/04/20/Initializing-the-WRF-model-with-ERA5/. Everything works fine unless I add surface pressure to surface data ...
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WRF vertical integrated moisture flux using NCL
Does anyone know how to calculate the vertical integrated moisture flux using NCL in WRF.
It would be best if you can share a NCL script.
Here is my code, I used this code to calculate the averaged ...
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WRF: minimal list of variables required by coupling a land surface model to the whole system
We are trying to couple our land surface model into WRF. As a first step, we'd like to know what is the minimal list of variables required by such coupling?
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WRF: EPSG code or spatial reference for Lambert conformal, Mercator and polar stereographic projections [closed]
I'm building an R package (https://github.com/ibarraespinosa/wrftools) to read namelist.wps and return a dynamic map which you can make zoom. In my case, it would be very beneficial because writing a ...
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WRF I/O: Can any variable be output into the wrfout file-stream?
This question is related to the WRF (Weather Research and Forecasting) Model
I read somewhere that a variable one wants to output, needs to be defined as state variable in the Registry like this (...
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How to map emission inventory from lat&lon corrdinate to WRF model grid
Here, I have a regional emission inventory, which mainly contains the varibales of lat,lon,...
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What is the general procedure to run WRF-chem with chen_opt=16
Is there anybody who has run WRF-chem with chem_opt=16 successfully to simulate the green house gases? According to the User guide, it can be done in this way. But ...
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How to install WRF on a Mac?
I would like to install the WRF model on my Mac computer.
Where can I find up to date and step-by-step instructions on how to install it?
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How to properly setup a domain in NWP model (WRF) according to meteorological input data
I want to setup a mesoscale weather prediction model (WRF or something else) to work with NCEP/GFS meteorological input data with resolution of 0.25deg. My question is how to choose a proper size for ...
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Does thermal bubble initiated in WRF dissipate over time?
I am running idealised supercell simulation using WRF model. The supercell storm is initiated with a thermal bubble. I just wonder if the thermal bubble is only affecting the initial temperature.
I ...
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ECMWF data as WRF input
I have earlier used FNL, CFSR, Reanalysis-2 data set as input in WRF. However, I am finding it difficult to download ECMWF data as there are so many variables. Can anyone with experience in ECMWF let ...
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SIGINT error WRF
I am trying to run WRF 3.8.1 using ncep2 but after a while the run stops and I get following error:
...
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Why is WRF-Chem not reading my emissions data?
I've been trying to run WRF-Chem with my emissions but they are not being read by WRF-Chem. RADM2.
I have emissions for the whole week, so io_style_emissions = 2 ...
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Running WRF with ECMWF GRIB2 model levels
ECMWF model data comes in a hybrid GRIB format, that is, model level output is stored in GRIB2 messages, whereas surface data still uses GRIB1 format. Ungrib is unable to understand this hybrid GRIB ...
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Dig in the rationality of model evaluation of WRF with land-based station data
I use WRF (Weather research and forecasting) model for in regional scale meteorology simulation. And then, the WRF output files will be deemed as criterial input data applying for chemical transport ...
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Does finer input data lead to a better model accuracy?
Climate and chemical transport models all need input files including meteorology data, emission inventory, surface data (e.g. land use type) to initialize the simulation field.
Take the case of WRF ...
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What denotes a parameterization in a model? (semantics )
I know that WRF has many different uses and options, from atmospheric chemistry to uses with fires, and so on. What exactly denotes a parameterization? For example, in WRF-Chem, is the chemistry ...
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How to set up a domain from namelist in WRF?
I'm fairly inexperienced with WRF and was wondering if anyone could point me in the direction of any helpful resources for it.
The task I have is to make a simple 9 km domain, but I'm having trouble ...
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How to transform the inventory data from degrees to kilometers
First all, my question was different from the question Converting grid resolution from degrees to kilometers.
In chemical transport modeling, the pollutant source inventory was an essential input ...
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How to output slope parameter and shape parameter in WRF?
I'd like to ask if it's possible to output slope parameter and shape parameter of cloud hydrometeors in WRF?
I'm calculating cloud effective radius and I'm using the formula found in Morrison scheme ...
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Why is WRF most often configured at 3:1 nesting ratio?
In WRF application, nested domain has always been used for weather/air quality modeling for the place of interest in a better resolution. The figure below illustrates this:
I have noticed that the ...
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Why does computation cost increase 24 times when the spatial resolution doubles?
In a Chinese book, I read about the relationship between the numerical model spatial resolution and the computation cost.
It states: when the spatial resolution of model is finer, the result ...
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Can the dew point temperature be more than drybulb temperature?
I am extracting data from WRF model output for a specific area. The area I am extracting data for is 5000m above mean sea level. When plotting on a graph, I found that the dew point temperature is ...
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Calculate precipitation from WRF model output
From WRF output file,
I find 3 variables related to the precipitation (unit: mm)
1. Precipitation
variable name: pr
unit:$kg/(m^{2}s^1)$
variable: RAINC+RAINNC
comments: $dt(...
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Technique to delete spin-up frames from WRF
I'm a user of WRF V3.5 aiming at meteorological simulation.
Sometimes, I'll run the model for a long period.
My attempt
I split the long period(e.g 1 year) into serval short ones.
For ...
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How to convert eta level to pressure level in WRF model
I am working WRF outputl file and require to extract wind and temp values at 850 hPa, 700 hPa and 500 hPa pressure levels. As the WRF vertical coordinates are based on eta level, I am having trouble ...
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Downscaling global meteorology data
Can some one explain me the basics of downscaling (interpolate to a smaller cell) a global meteorology data to a local scale (2 km × 2 km). IF would be very thankful if you provide a link at least. is ...
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What is "focus point" in WRF-plots grid box? (python code)
has anyone used the python code from here (written by Geir Arne Waagbo) to plot skewT plot from WRF output?
I've got a question regarding some of the functions used in the code found in ...
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WRF output grid is smaller than input definition
I am running some test forecasts using WRF 3.6.1. and am having some problems with my grids. Specifically, I am specifying a parent and nest domain each with 25 points for longitude and latitude (so ...
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The climatological variance of albedo, soil moisture in weather models
Looking at WRF currently but I am sure this applies to most weather models there is a file (specifically LANDUSE.TBL) that specifies USGS derived albedo, soil ...
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How to get cell indices from latitude and longitude in WRF model grids?
I am using Weather Research and Forecasting model WRF and the WRF Preprocessing System WPS and could not get a satisfying answer from wrfhelp. Can anyone guide me in transforming latitude and ...
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