Questions tagged [atmosphere-modelling]

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2
votes
1answer
18 views

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 ...
2
votes
1answer
71 views

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. ...
1
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2answers
70 views

Tornado prediction or forecasting by supercomputers [closed]

Can tornadoes be predicted or forecasted using supercomputers?
2
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0answers
44 views

What is the atmospheric percentage of oxygen produced by trees and phytoplankton every year?

I know that every year carbon sinks remove ~20Gt of CO2 (about half of our emissions), and release a comparable amount of O2 , But I want to know how much O2 the carbon sinks produce annually ...
3
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0answers
34 views

How to convert $\ce{NO2}$ mixing ratio (ppmv) into $\ce{NO2}$ column density(moles/m2)?

I have a WRF-chem output with NO2 mixing ratio for 37 levels, for my analysis I need to convert it into into column density. How do I do that?
7
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0answers
63 views

Nobel prize Manabe's 1967 code for solving the 1D atmospheric thermal equilibrium model

Does someone know where to find a (hopefully modern) version of the numerical code for solving the 1D atmospheric thermal equilibrium model, the one Syukuro Manabe & Richard T. Wetherald used in ...
8
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4answers
7k views

On the light difference between morning and afternoon

It is long time that I am looking for what physical reason(s) explains this observation: the sun ambient light between sunrise and midday is crispy, somehow whiter than that of the afternoon hours. ...
3
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4answers
1k views

How thin is our atmosphere relative to the size of Earth?

According to the GRC NASA website, Earth's atmosphere is a thin sheet of air extending from the surface of the Earth to the edge of space. Some videos on youtube also point out that if the Earth is ...
6
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1answer
4k views

How to calculate humidity using outside temperature and outside relative humidity?

I would like to ask how to calculate the relative humidity that a heated indoor area would have using only outside temperature and outside relative humidity. I found the Relative Humidity Calculator ...
3
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1answer
65 views

Would the atmosphere move rigidly with ground if you ignored wind?

I know this sounds basic but I've wondered about this for a long time and I'm still confused. In aviation, air speed is ground speed minus wind speed. If wind speed is zero, air speed equals ground ...
3
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1answer
59 views

Climate on Venus after it becomes tidally locked

Suppose, Venus becomes tidally locked. Will its dark side cool enough so that the CO2 from atmosphere to precipitate in liquid form to make an ocean?
0
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0answers
32 views

Difference in values if the source region lies outside or within the nested grid domain with boundary conditions from coarser resolution

I want to see the anthropogenic influence of one region(source) to another region(receptor). I would be conducting nested grid simulation. But, the nested grid simulation will be limited to receptor ...
6
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1answer
117 views

What is the characteristic time of the loss of the Earth atmosphere, how can it be calculated?

Somewhere I've read it is in the order of some tens of billions of years, but unfortunately I can't find any reference with it in Google. I suspect, the losses are coming mainly from analyzing the ...
1
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1answer
106 views

Meaning of ECMWF model levels

I am trying to understand the actual meaning of the ECMWF L137 model levels. In the link I provided, both pressures (in hPa) and heights (in m) are given for every level. But which actually defines ...
5
votes
1answer
1k views

How to calculate the solar radiation at any place, any time

The solar radiation is one of the important factors controlling the formation of $O_3$, and thereby impacting the levels of various secondary species in the atmosphere. However, in the campaign of ...
4
votes
1answer
91 views

How to derive the total potential energy of the atmosphere?

In one of Lorenz’s paper (I mean the meteorologists Edward Lorenz), he stated that the total potential energy of the whole atmosphere $P + I$ (means the sum of potential energy and internal energy) is ...
5
votes
1answer
99 views

Correct way to spin-up for sensitivity analysis in a Global Chemical Transport Models

In my understanding, in Global Chemical Transport Models, initial conditions are provided by spinning up the model or through previous simulation. But, can I use the same initial condition that I ...
5
votes
1answer
102 views

How to estimate the settling time of atmospheric particulates as a function of aerodynamic size?

Understanding the behavior of particulates in the atmosphere is important for modeling climate, weather and public health. They can be nucleation sites for rain, fog and smog, they can have thermal ...
2
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1answer
38 views

Free forecast vs cycled model runs

What is the difference between a free forecast and a cycled model run? This GFS wiki mentions both, but does not define them.
5
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1answer
311 views

Temperature change in Earth atmosphere models?

NASA's page about Earth atmosphere models gives a weird equation about temperature change in different atmospheric layers. One of the formulas looks like this: Can someone explain to me what this ...
1
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0answers
79 views

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, ...
0
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2answers
302 views

Doesn't Increase of Potential Temperature with Height contradict Adiabatic Nature of Processes within Troposphere?

I refer to this question, I asked recently in the physics board: https://physics.stackexchange.com/questions/578308/doesnt-increase-of-potential-temperature-with-height-contradict-adiabatic-natur It ...
1
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0answers
46 views

What is the best way to calculate anomaly of meteorological variables with the (GFS/GEFS) forecast

To calculate the anomaly of a variable (temperature, for example) I need the climatology (at least 30 years) of that variable. Which climatology data source should I use? Should I use the "...
0
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0answers
91 views

Derivative of the Unit Vector in Spherical Coordinate system

I have a doubt regarding a step in the derivation of the momentum equation in spherical coordinates. I am referring to the textbook "Fundamentals of Atmospheric Modeling" by Mark Jacobson, 2nd Edition,...
3
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2answers
121 views

Literature on atmospheric modelling

I need to understand some basics about atmospheric modelling, since I am working with data from the COSMO model for my thesis. My questions mainly concern model validation, like learning about the ...
1
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2answers
722 views

How to search for the nearest non nan value in 2d xarray dataset

I have a 2d xarray dataset and I am having several nan values in the dataset. These nan values need to be filled with the nearest non-nan values in the 2d array. How do I do this? I am trying to ...
6
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1answer
1k views

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 ...
1
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0answers
252 views

How can I do cdo remapbil

Can anyone to help me? I am trying to use this command to interpolate my netcdf data into my wrfinput_d01 . I have used this: ...
1
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0answers
37 views

vertical integrated moisture flux [duplicate]

Does anyone know how to calculate the vertical integrated moisture flux using NCL or Grads if you share a NCL script I'm very thankful to you.
9
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3answers
628 views

How bad is geo-engineering?

It is just curiosity that forced me to ask this question. At some point in time, if we can't control global $\sf{CO_2}$ emissions, temperature will increase until a tipping point and it will be a ...
5
votes
1answer
3k views

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 ...
3
votes
1answer
133 views

How does composition change if you extend an Earthlike atmosphere 50km below sea level? [closed]

I'm working to design the atmosphere of a fictional planet inspired by Venus (let's call it Cael). Cael's atmosphere at an altitude of 50 km is essentially identical to Earth's atmosphere at sea ...
3
votes
1answer
679 views

How to solve libnetcdf.so.12: cannot open shared object file in pyferret?

My pyferret was working perfectly until I had installed netCDF4 and now it is throwing up this error ...
7
votes
2answers
171 views

Where to get temperature sounding model forecast data?

I want to know the current lapse rate for a given point in the US. In other words, I want "live" temperature data at various altitudes. Live is flexible -- I'm generally OK with a forecast which is ...
0
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0answers
62 views

What is difference between an atmospheric model and a climate model?

I am wondering the major differences been an Atmospheric model and a Climate model? For example, Regional Atmospheric Modeling System (RAMS) versus Regional Climate Modeling System (RegCM). I recently ...
2
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1answer
44 views

Discrete distribution of daily rainfall [closed]

How can I estimate the rainfall rate every ten minutes during a day having the total amount of rainfall during that day ?
3
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1answer
240 views

What is the synoptic/atmospheric setup that is causing the U.S. severe weather outbreak in May 2019?

I asked this in the chat and it was suggested I ask on the main site. There's been a seemingly perpetual severe weather outbreak over the central and eastern U.S. over the past two weeks. Killer EF3s ...
1
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0answers
56 views

How to transform level 2 satellite retrievals to level 3 gridded data

Usually, I use level-3 gridded satellite data to analyze the spatial and temporal patterns of atmospheric compositions. However, there were some data sources which only afford level 2 product. For ...
1
vote
1answer
75 views

How big of an event is needed to trigger a long winter?

Could a small meteor or natural nuclear explosion melt an ice cap on Earth to trigger a mini ice age without the event being observed by people? Can the Earth have an overlaying thermal cycle that ...
2
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0answers
20 views

Rainfall Frequency Analyses

I have monthly precipitation data and would like to create the frequency curve for the 2, 5, 10, 100 year storms. I have access to NetStorm, STORMS 2000, CFA (from Environment Canada) and HEC-SSP. ...
2
votes
1answer
199 views

How can I create multi model ensemble from output of 3 CMIP5 models?

I have a output of 3 models of CMIP5, they are CCSM4, IPSL and MPI. I have two scenarios RCP 2.6 and RCP 8.5 for each model. I want to know that how can I create a multi model ensemble from these 3 ...
1
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0answers
57 views

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 ...
2
votes
1answer
1k views

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 ...
2
votes
0answers
80 views

Importance of surface boundary conditions in a weather model

I have a question regarding the usage of SST values for simulating a real time event such as a tropical cyclone. I feel that I should use the most updated SST values in order to get the accurate ...
6
votes
2answers
939 views

Take all the CO2 in the atmosphere and put it into a layer on the surface of earth, how thick would the layer be?

I teach a Middle School (year 8) Geometry course and have a student attempting to answer this question. My assumptions: earth's radius is $3959 \text{ mi}$ earth is a sphere There is approximately $3 ...
6
votes
2answers
808 views

What is the meaning of step in ERA reanalysis data?

The webpage to download ERA data includes an option called "time" which is intuitive, but also an option called "step". I can't find an explanation of the meaning of this. It can't be a time step ...
1
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0answers
39 views

Seeking CMIP5 or CMIP6 globally in .nc format

Is there in some ftp storage, a pre-processing CMIP5 data for direct download in netcdf extention?
6
votes
1answer
105 views

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 ...
5
votes
2answers
519 views

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,...
3
votes
0answers
147 views

Conversion of an NWP model into climate model

I am wondering if anybody has an idea about the difference between regional climate models and numerical weather prediction models that are run at the same domain. I have a basic idea that the ...