Questions tagged [atmosphere-modelling]

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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,...
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2answers
70 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 ...
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61 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: ...
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19 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.
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1answer
127 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 ...
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2answers
104 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 ...
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1answer
304 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 ...
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2answers
111 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 ...
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50 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 ...
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1answer
40 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 ?
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1answer
218 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 ...
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38 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 ...
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1answer
67 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 ...
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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. ...
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1answer
134 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 ...
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43 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 ...
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1answer
959 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 ...
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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 ...
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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?
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23 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?
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128 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 ...
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1answer
797 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 ...
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66 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 ...
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1answer
31 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 ...
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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 ...
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0answers
47 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 ...
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87 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 ?
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2answers
392 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,...
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1answer
181 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 ...
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2answers
5k 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. ...
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1answer
2k 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 ...
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2answers
136 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 ...
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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 ...
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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,...
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3answers
324 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 ...
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148 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 ...
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2answers
265 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 ...
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1answer
654 views

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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3answers
543 views

Correlation and causation

Linear correlation (Pearson's) is vastly applied in meteorology/climatology to assess the relationship between two variables, say precipitation and SST, for example. However, we know that correlation ...
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1answer
86 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 ...
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0answers
61 views

Equation for Atmospheric Pressure Tide

Using Pressure sensors - I found out that there is a daily pressure wave-like pattern with peaks at 9:00 & 21:00 (local time). I want to construct an equation to explain this phenomena, probably ...
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0answers
479 views

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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1answer
853 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 ...
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2answers
1k views

How to interpret the values of moisture flux convergence?

I have a time series of moisture flux convergence. The values show positive and negative. What are these positive and negative values say? Can somebody help me how to interpret it? How it is related ...
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2answers
1k views

How to compute du/dx and dv/dy in moisture flux convergence?

I have $u$-wind, $v$-wind and specific humidity. I would like to compute moisture flux convergence at a grid point. So I need to compute the value of $q(\frac{du}{dx} + \frac{dv}{dy})$ My question is ...
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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 ...
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2answers
84 views

Does hydroxyl radical chemistry in air quality models create numerical stability problems?

Atmospheric mixing ratios of the hydroxyl radical have relatively short lifespans (on the order of microseconds). When modeling air quality or the weather, the time step is usually much larger than ...
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3answers
1k views

Why are inversion layers so important in meteorology?

I keep hearing the term "inversion layer" when reading about pollution and meteorology. I know it vaguely amounts to "some place where the gradient of temperature is inverted". But why are inversion ...
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1answer
124 views

How can I implement a visualization of archived convective data from numerical weather models?

I've always found geographic visualizations of surface/mixed-layer CAPE models and other weather data to be incredibly interesting. Here's a map featured by the Capital Weather Gang over at the ...
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1answer
2k views

How does humidity vary with height in the Earth's atmosphere?

I am busy with the development of an "environment" model that can be used for flight simulation of all kinds of flight vehicles — ranging from quad-copters, unmanned aerial vehicles, manned aircraft, ...