Questions tagged [models]

A tag for questions about conceptual, analytical or numerical models used in Earth science disciplines.

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26 views

Is COMSOL Multiphysics good for subduction CFD modelling? Are there alternatives?

As a beginner for CFD modelling of plate subduction, I heard comsol to be a good software. Can anybody suggests alternatives and the demerits of using COMSOL Multiphysics? Thank you.
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41 views

How would you predict the future climate with only 7 years of interest?

In my specific case, I have worked with a data set from 2001 to 2018 which had to be split up in 2012 due to major updates in the data. Therefore, I am now dealing with a data set of 12 years (2001 to ...
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1answer
29 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.
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47 views

Looking for the climate classification for a particular climate

I'm looking for the climate classification among the many different climate classification systems covering my absolute favorite form of climate. If a classification for this doesn't exist, and you ...
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1answer
100 views

How/where is randomness/stochasticity used in weather prediction

I am seeking information on how weather models use randomness (if at all). From what I can gather daily weather forecasting uses partial differential equations with initial and boundary conditions ...
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How can I specifiy a substance in AERMOD?

Since I use OTHER as a pollutant ID, are there some parameters I could specify in order to get better results for dispersion of substance I am trying to model? eg. molecular weight or density?
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15 views

Does anyone know of any studies comparing juvenile and adult abundance data for an ontogenetic reef fish? [closed]

I'm trying to look into relationships between juvenile Hogfish which recruit in sea grass habitats to adult abundance data that move to deeper offshore reef and hard bottom habitat. I have data from ...
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74 views

How do you choose appropriate parameters for a lowpass filter when filtering a Bouguer anomaly?

I am trying to filter my Bouguer anomaly data to remove the short wavelength features. I have created a lowpass filter to achieve this, but I am wondering how I can more objectively choose my cutoff ...
4
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1answer
71 views

Do trees capture more CO2 during a fast growth stage?

I understand that trees capture CO2 from the air and use that carbon to grow. As trees reach mature height, do they begin to capture less CO2 as they would only need carbon for "maintenance" as ...
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1answer
53 views

How to estimate the runoff time for my area?

I want to use an rainfall-runoff model for pluvial flash floods and need to choose for my synthetic rain event the appropriate duration. In the literature it often says that the chosen duration should ...
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2answers
130 views

What is the simplest meteorological model to operate?

For teaching purposes I am looking for an atmospheric model that can be easily installed and the input data can be easily read and prepared. Preferably I would like to run a global low resolution ...
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25 views

How to transfer surface roughness from the unit mm into Strickler coefficient m1/3 per second

I have a hydrodynamic model to simulate flash floods. This model expects roughness data in the Strickler coefficient format (kst) in the unit m1/3 per second. I got a table with roughness values I'm ...
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How to choose “relevant” precipitation durations for flash flood modelling?

For my thesis, I model flash floods in urban areas. A book with recommended practices says to use events with a recurrence interval of 30 and 50 years. Regarding the duration of the precipitation ...
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1answer
167 views

How quickly is the Earth shrinking?

Except for ice, acetic acid, bismuth and gallium and a few other things materials generally shrink when they cool and solidify, so I'm pretty sure Earth has as well. It probably wouldn't be ...
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1answer
66 views

Energy Density of Porous Rocks

It's very long, I know. But please, don't be discouraged from going through this question if you can help me. The question is at the second to the last paragraph, but you need to read through to ...
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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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41 views

struggling to find a good research question in rainfall runoff modelling [duplicate]

I'm writing my thesis on modelling extreme rainfall and I'm still struggling to find a good research question. I have asked a similar question before in this post. Maybe you guys can give me some ...
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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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1answer
77 views

Waves in very thin layer

Elastic waves in the earth are described by the elastodynamic equations \begin{align} \rho \frac{\partial^2 u}{\partial t^2} &= (2 \mu + \lambda) \frac{\partial^2 u}{\partial x^2} + \mu \left( ...
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48 views

how does model validation work? What is needed for an appropriate validation

I have an 2D hydrodynamic model in a approx. 10km² catchment and one rain event that goes one hour with measurements in a 5min interval. The reccurance interval for an event like that is close to ...
3
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1answer
160 views

SWAN wave model: HSIG is strangely low

I have a question about SWAN wave model, I tried to ask it at the SWAN mailing list, but with no luck, so I'm asking here. First of all I have to admit I'm not a professional SWAN user. All the ...
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140 views

Cratonization - how did the Archean cratons form?

Before the onset of modern style plate tectonics and the Wilson cycles in the late Archean, it is thought that smaller units of continental crust, called cratons, roamed the oceanic crust over a more ...
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1answer
47 views

hydrologic vs. hydrodynamic modelling of surface runoff

In the description of a Software it says that it computes the net rainfall, runoff formation and runoffconcentration on a surface hydrologically. With an extra module, the runoff formation can also be ...
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1answer
52 views

research question for modelling extreme rainfall event with coupled 2D surface and 1D sewersystem model

I would like to write my thesis on modelling extreme rainfall events in urban areas coupling a 2D surface model with an 1D sewer channel model. I have access to a good software which models ...
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1answer
190 views

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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20 views

what is a sensitivity analysis in heavy rain 2D surface / 1D drainage network models

For my thesis, the lecturer proposed to make a "sensitivity analysis" with a 2D surface model connected with a 1D drainage Network model for a storm rain event. However, I'm having problems to figure ...
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ERA-5 data downloader… other than CDS-API?

The CDS API does not behave well on our machines. Has anyone had any luck scripting their own ERA-5 reanalysis large-data download script? Perhaps something that is not nearly as large, clunky, and ...
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2answers
131 views

Do tectonic plates “float” over the mantle and “collide” like icebergs?

I'm always hearing about tectonic plates as large chunks of crust floating on the mantle just like boats. In timescales of millions of years they move and even collide. But I'm starting to think this ...
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1answer
22 views

Modelling extreme rainfall events: 'blanket approches' when considering soil infiltration

For my thesis on modelling an extreme rainfall event with a 2D surface runoff model I'm supposed to consider the effect of soil infiltration on the runoff: In my work description it says I'm supposed ...
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1answer
102 views

Effects of Centrifugal Force on Gravity Vectors?

I've been asked this question twice now from our favourite science denying community, and I don't know how to parse it. I can do centrifugal force and gravity given mass, but have never tried to even ...
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2answers
156 views

Why rely on climate models as opposed to paleoclimate data?

Something I hear often from climate scientists, and indeed even politicians, is that we "don't understand climate change very well". And, I'm sure this is true since the climate is a complex adaptive ...
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1answer
67 views

How reanalysis data influence our research/results?

I am a student and I have a very simple and yet important question about reanalysis data. Recently, I attended a workshop where various other students discussing the use of ERA5 reanalysis data on ...
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2answers
85 views

What does slat and elat (slon, elon) in latitude and longitude values mean?

I have data from the national storm prediction center that is marked with values of : elat slat elon slon ...
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1answer
113 views

Run Hydrus-1D from the command line

Hydrus-1D, is a modeling environment for analysis of water flow and solute transport in variably saturated porous media. This program has a graphical environment which works very well, however a lot ...
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2answers
61 views

Is there a general equation to know how big of an area is affected by an earthquake?

If you visit USGS earthquakes listing, you get 3 points of information for each earthquake: Location, depth, magnitude. My question is, is there a way to approximate how big of an area is affected? ...
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1answer
71 views

Can living where magnets are abundant provide a mini-magnetoshere?

Are there a mini-magnetosphere within the magnetosphere similar to mini-magnetosphere found on the Moon? Is there a map of these areas that would resemble the white swirls in the picture below? The ...
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1answer
128 views

What types of high-level mathematics are useful in doing climate modelling/meteorology?

I'm aware that PDEs, linear algebra, numerical analysis and such are staples of most applied mathematical endeavors. I want to know if there are other areas of "higher" mathematics that have useful ...
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77 views

Does tropical rain forest as defined by the Holdridge Life Zone classification exist in any meaningful prevalence?

I've been recently introduced to the Holdridge life zones and their method of classification, and have been somewhat concerned/confused by the definitions of tropical rain forest as described by the ...
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2answers
259 views

Why doesn't Wolfram Alpha show low gravitational acceleration for the Hudson Bay?

I thought I would be clever and add a new answer to Hudson Bay Has Low Gravity? by using Wolfram Alpha to report gravitational acceleration for different locations, but it looks like my cleverness ...
2
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1answer
142 views

Which ocean is going to be swallowed by the Supercontinent Cycle, Atlantic or Pacific?

The register shows several supercontinents have been formed on Earth's History: "The most recent supercontinent, Pangaea, formed about 300 million years ago (0.3 Ga). There are two different ...
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1answer
142 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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0answers
64 views

Do any of the ECMWF ensemble forecasts have the associated true values?

I am looking for a dataset of ensemble forecasts and the associated true observed values. For example, a dataset containing $n$ ensemble forecasts of the temperature in 24 hours and the observed ...
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20 views

Model impact of atmopsheric circulation changes on precipitation dD of a region

I'm looking to model the impact of broad scale atmospheric circulation changes on the hydrogen isotope ratio of precipitation for a given region. As an example, what impact does a high pressure system ...
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0answers
23 views

Glen's power-law alternatives

For glacier models, there exist alternatives to the Glen's power-law? I searched on internet, but I have not found other alternatives.
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The DRASTIC groundwater vulnerability model and it's relevance today

I am reading a groundwater pollution vulnerability study by Mark Angle of the Ohio Dpet. of Natural Resources (ODNR) for my county. The model used to assess the groundwater vulnerability for the ...
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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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159 views

Difference between GDAS and GFS data

What is the exact difference between GFS 0.25 and GDAS 0.25 data which is available in http://nomads.ncep.noaa.gov/. And are the GFS 0.5 and 1 degree data available in the above url and here the same?...
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27 views

What's the difference between “loading” and “receiving” in water quality modeling?

I see some models described as simulating 'receiving water quality' and others as 'pollutant loading' models. What is the difference between loading and receiving models in this context? I am more ...
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49 views

Simple numerical model of tide with an elliptic scheme

I have recently been given the task of developping a coastal model for tides. I have a few requirements, it must not be time stepping in order to be as fast as possible and in finite differences ...
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Statistical dependence of mean annual soil evaporation and mean annual precipitation globally

I am studying a simple dynamical system that represents a plant and water system, similar to Klausmeier. In Klausmeier model the mean annual precipitation and the soil evaporation are introduced as ...