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Questions tagged [models]

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

37 questions with no upvoted or accepted answers
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15
votes
0answers
217 views

How to compute the earthquake occurrence probability under ETAS model

I have fitted an ETAS model (unmarked) with an independent exponential magnitude distribution to a set of earthquake data. However, I do not know how to calculate the probability of the earthquake ...
9
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0answers
77 views

What field studies have developed or supported the Penman-Monteith equations for estimating evapotranspiration?

I'm trying to understand transpiration estimation methods. The FAO recommends a standard Penman-Monteith methodology for modeling evapotranspiration based on meteorological and vegetation parameters (...
8
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3answers
313 views

Understanding the Mercator Projection

To illustrate my problem, let's say I have lattitude and longitude coordinates, such as 38.871105, -77.056042. I want to be able to calculate the new lattitude and longitude if, say, I moved 300m ...
7
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0answers
425 views

Monitoring air pollution with Landsat satellite data

I'm trying to build an air pollution model. So far I have built one for point sources. Now I'm looking at monitoring air pollution with satellite images, based on the idea that every basic pollutant ...
5
votes
0answers
573 views

Why did the GFS switch to hourly forecasts through hour 120?

About a month ago, the GFS was upgraded. Among other things (like making parallel GFS data available), the upgrade notice said: Include hourly forecasts out to 120 hr Now, this seemed ...
4
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0answers
247 views

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics?

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics? I want also to understand the difference between the different storage coefficients (...
4
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0answers
40 views

Dealing with uncertainty in source apportionment

I have a dataset of dissolved load (major and trace elements), the associated error is specified as <10% for all the cases, in the same way I have rock analysis (major and trace) with the same ...
3
votes
0answers
29 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 ...
3
votes
0answers
97 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?...
3
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0answers
46 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 ...
3
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0answers
18 views

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 ...
3
votes
0answers
99 views

Do 360 day calendars affect climate models?

I was recently reading Zach Holman's blogpost on time and remembering that I've had to work with CMIP5 output that used a 360 day calendar, rather than a 365 day or a Greogrian (or Proleptic Gregorian)...
3
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0answers
982 views

Moisture flux convergence in GrADS

I want to calculate vertically integrated moisture flux convergence (VIMFC) in GrADS. But when I give the following instruction it marks me errors: ...
3
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0answers
398 views

Trewartha climate classification overlap?

By my reading of the wikipedia page on the Trewartha climate classification, climate classifications are not mutually exclusive. Let's take a look at the climate classification of Iowa City, IA. The ...
3
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0answers
103 views

What is the plausability/legitimacy of the San Andreas Fault 'Big One' Megaquake mechanism?

In the ScienceAlert article "New estimates suggest the 'big one' in San Andreas could be much worse than we thought" they make the claim that: Researchers have forecast a mega-quake running the ...
3
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0answers
169 views

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 ...
3
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0answers
192 views

Point source pollution model for South America

I want to model point source pollution in S. America watersheds. Specifically, given a set of pollution points and corresponding pollution output levels, I want to know the course these pollutants ...
2
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0answers
32 views

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 ...
2
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0answers
59 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 ...
2
votes
0answers
48 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 ...
2
votes
0answers
53 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 ...
2
votes
0answers
50 views

What regions of the US will have *improved* climate given current predictions of climate change?

This is really a two part question: 1) Is there a good model for mapping climate conditions in a particular location to pleasantness or livability or something like that? 2) If there is such a model,...
2
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0answers
372 views

Linear Boussinesq Equation for groundwater flow in inconfined aquifer?

I was reading a paper (equation 1 in linked paper) where they used 'linearized Boussinesq' equation to model groundwater in unconfined aquifer. The linearized Boussinesq equation described in the ...
2
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0answers
58 views

Formula for numerical model for sustained warming in marine sediment?

I have been reading this paper and found simple numerical formulations to model the time duration, affected depth and amount of warming of marine sediments. The author uses a rudimentary estimate of ...
2
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0answers
71 views

Inverse model problem

I have a dataset for river water, rain water and geology (main elements and trace elements). I want to apportion the contribution of geology to water chemistry using for that purpose a model. I was ...
1
vote
1answer
34 views

Community change along urban rural gradient

I was wondering whether someone has an idea about how to investigate community changes of plants/animals along an urban-rural gradient? I have a large data set consisting of plant/animal abundance and ...
1
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0answers
53 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 ...
1
vote
0answers
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 ...
1
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0answers
19 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.
1
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0answers
22 views

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 ...
1
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0answers
33 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
vote
0answers
22 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 ...
1
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0answers
36 views

Watershed scale water quality indices

I understand water quality indices play a fundamental role in modelling water quality as they integrate multiple water quality parameters to bring about a single dimensionless digit that represents ...
1
vote
0answers
18 views

What models are available to estimate effect of surface water on groundwater quality?

I want to determine the effect of surface water quality or the effect of chemicals used on surface like fertilizers on groundwater. What choices do I have for predicting groundwater quality? What are ...
0
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0answers
81 views

Moisture flux convergence/divergence calculation in Grads

I want to calculate moisture flux divergence/convergence in 850 hpa for the summer and I have monthly mean gridded data sdfopen shum.mon.mean.nc sdfopen uwind.mon.mean.nc sdfopen vwind.mon.mean.nc ...
0
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0answers
16 views

Do snow and ice have different temperatures at their interface?

tl;dr: For snow on top of ice, is the temperature at the base of the snowpack always (practically) the same as the temperature at the top of the ice? I was trying to understand how the thermodynamics ...
0
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0answers
44 views

Caspian Sea oil deposits

Azerbaijan appears to have vast development in its oil sector. Images on google earth show oil platforms connected by road ways far out into the Caspian Sea of the coast of Baku. Why is the majority ...