Questions tagged [atmosphere-modelling]

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3
votes
1answer
62 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
57 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 ...
1
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1answer
74 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 ...
4
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1answer
58 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
93 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 ...
2
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1answer
36 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
290 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
66 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
202 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 ...
5
votes
1answer
86 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 ...
1
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0answers
44 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 "...
3
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4answers
625 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 ...
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0answers
58 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,...
1
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2answers
513 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 ...
1
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0answers
201 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
33 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.
3
votes
1answer
130 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
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2answers
116 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 ...
3
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1answer
655 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
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2answers
158 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
56 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
236 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
48 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
73 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
19 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
181 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
55 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
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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
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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 ...
1
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0answers
38 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?
1
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0answers
24 views

CALPUFF dispersion model - orography

Is it possible to use CALPUFF in ISC-type single-station mode accounting for "simple" terrain effect (like in ISC)? Can I set the orography out of CALMET?
3
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0answers
146 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 ...
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 ...
2
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0answers
112 views

Internal energy, enthalpy, and work in the atmosphere

I'm writing a toy radiative-convective atmospheric model and need to relate the heat flux convergences (either surface sensible heat flux or the radiative flux) to changes in atmospheric layer ...
1
vote
1answer
37 views

Can the Air Mass Factor (AMF) be negative?

I am using a untraviolet-visible spectrometer to measure Vertical Column Densities (VCDs) of trace gases up to the stratosphere. It is physically impossible to have negative VCDs. I have observed some ...
2
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0answers
54 views

The difficulties for the simulation of atmospheric metals

Atmospheric metals usually reside in aerosols with complex source origins. The concentrations distribution of metals especially for those with high toxicity (Pb, Cd, Ni, V) should be informative for ...
3
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0answers
52 views

What does this reference velocity refer to? (Atmosphere-Ocean Momentum Exchange)

The above image is taken from "Atmosphere–Ocean Momentum Exchange in General Circulation Models", John A.T.Bye 1999. It represents the inertial coupling concept between the atmosphere and ocean. It ...
1
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0answers
96 views

What would happen to the Subtropical Ridge/Horse latitudes and Polar front if the Earth was rotating 5% faster?

Would they move towards the Equator/Poles? Stay in the same place? What about if the Earth was rotating 10% slower? Is there a rotation speed for Earth which will lead to 4 wind belts instead of 3 ?
5
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2answers
476 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,...
6
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1answer
207 views

How does temperature impact the elevation distribution of orographic precipitation?

Consider the case of two weather systems of different temperatures hitting the Andes Mountains from the west: After traveling a long distance over the Pacific ocean I would expect the air in both ...
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. ...
6
votes
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 ...
5
votes
2answers
141 views

Change in vertical wind intensity in atmospheric modeling

I am a beginner to atmospheric modeling. I want to know about the change in vertical wind intensity in modeling studies. In general, if I initiate a simulation,I will get the real vertical wind ...
2
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0answers
45 views

NaN values of aerosol variables in KF/Kuo parametrization schemes

I am using the numerical weather prediction (NWP) model RAMS to simulate a Tropical Cyclones in BoB region. I made two setups with two Cumulus Parametrization schemes (Kuo and KF). Initial and ...
1
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1answer
50 views

Role of radiation parametrization update frequency in Tropical Cyclone simulation

I am using a mesoscale model to simulate a tropical cyclone. The model input file has an option of 'Frequency of Radiation Tendencies update time' for Longwave and Shortwave radiation. According to me,...
1
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3answers
337 views

Websites providing visual weather data

What websites are there providing visual weather data? The question actually contains the past and future weather. The purpose is for this question is to provide a list of easy-to-access websites that ...
5
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0answers
152 views

Is there a reconstruction of paleoclimate sea level air pressure?

In paleoclimateology graphs of both temperature and atmospheric composition versus time are common. Where can I find a reconstruction of sea surface pressure versus time? I have found one paper that ...
2
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2answers
278 views

Is there an atmospheric data database somewhere on the web?

For a personal project, i wanted to develop a global atmospheric database, to compile data like wind speed and direction, temperature, etc. from different sources. My question is this : Does such a ...