Questions tagged [climate-models]

Mathematical models used for studying the dynamics of climate systems or predicting future climates.

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0answers
352 views

How accurate are climate models? [closed]

"All models are wrong but some are useful". I am not against the concept of anthropogenic climate change because climate models may not be strong source of information for climate change. Observation ...
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1answer
846 views

How to calculate w-wind?

My model (AGCM) does not compute w-wind (the vertical component of the wind velocity). However, I do have the following available variables from AGCM output: ...
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1answer
247 views

North Atlantic Oscillation (NAO) future prediction - Academic papers?

I am looking for academic papers which show future predictions of the North Atlantic Oscillation (NAO) by considering climate change and the various emission scenarios. Do you have any suggestions?
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1answer
80 views

What would be the sea level rise if all fossil fuel resources are burned?

Tokarska et al. (2016), a Nature article from a team of the University of Victoria, predicted a global temperature increase of 7±2.5°C and 17.2±2.5°C at the equator and at the poles ...
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1answer
56 views

Interpolating Merra reanalysis

Merra re-analysis ara available for a coarser horizontal grid with resolution of 0.625 × 0.5 degrees providing differents parameters : Precipitation, Temperature ....This been said, I want to ...
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1answer
100 views

Kalman - Data assimilation with external model

I'm working with a distributed snow model which simulates Snow Depth and Snow Cover area. It takes in input some atmospherics variables : Temperature / Precipitation / Wind speed ... I want to ...
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2answers
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The Search for Climate Forums [closed]

For my fictitious alternate Earth, one of the most important things to consider is that any change in geography and geology can result in profound changes in environment and climate. I've been ...
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2answers
290 views

A guide to how climate change will affect different countries [closed]

Let's assume that the climate change won't be prevented. I'm looking for a guide to show how the climate change will affect different countries. Specifically, I'm interested in comparing following ...
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3answers
168 views

Need different temperature change data sets explained

Nasa's temperature record is showing temperature increase. When I confronted a climate change skeptic with it, he replied that the data has been tempered with, and that there are different data sets ...
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1answer
625 views

NCEP reanalysis model levels

ECMWF Model Levels The above link describes the coefficients used to define the ECMWF model levels in pressure in order to compute geopotential height. Is there a similar data for NCEP reanalysis ...
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2answers
3k views

Interpolate Gaussian grids to regular fixed grids using bilinear interpolation?

I want to regrid GCM data available on Gaussian grids to regular grids, say at 1 deg X 1 deg. How to do this using CDO or Python ...
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4answers
5k views

Looking for evidence against some points raised in Ivar Giaever's speech on climate change

I just listened to Ivar Giaever's speech on the climate change, and he raised following points which seem significant to me: Temperature differences y/y are very small compared to natural variation ...
5
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1answer
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Are AO-GCMs sensitive enough to take large lakes into account?

Of course atmospheric-ocean-coupled global climate models are, by their nature, very strong on ocean-atmosphere interaction, but what about large lakes? Lake Victoria in East Africa, the N American ...
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Near Future Precipitation and Temperature estimations?

I was wondering if anyone here is familiar with temperature and precipitation estimation? I need to estimate P and T from April to July 2016. I am planning to use excel to do the calculation because ...
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3answers
509 views

What exactly is a model grid?

I have just begun reading some notes about modelling and can't seem to understand what a 1°x1° grid or a 2.5° grid or 1/4° grid is. I know it is something related to the resolution of the area over ...
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455 views

Does the Labrador current affect North Atlantic climate?

This summer has seen very low sea surface temperature anomalies in the North Atlantic. Using animations of these over the last year I feel the runoff of freshwater from Hudson Bay, into the Labrador ...
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1answer
121 views

Are 'Return Periods' being recalculated? If so, how?

The concept of 'return period' (= 'average recurrence interval', or ARI) is widely used in hydrology, and to a much lesser extent in geology, geomorphology, geophysics, etc. Whatever the application, ...
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2answers
1k views

“The world will start COOLING DOWN in 2017”?

There's a story going around the low-grade news factories that one Dr. David Evans has predicted that the world will start cooling down in 2017. One source reports: He says fundamental flaws in how ...
7
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1answer
400 views

How will global warming affect climate systems like the ENSO or the MJO?

How will global warming influence climate systems such as the Madden–Julian Oscillation (MJO) or the El Niño Southern Oscillation (ENSO)?
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2answers
609 views

Why do winter temperatures account for most of the increase in global temperature?

If you examine the detailed temperature records that form the basis for our understanding of global warming, there are some strange anomalies (at least from a naive point of view where warming affects ...
8
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2answers
589 views

How to perform regridding (1.0d to 0.5d) using bilinear interpolation for an irregular area?

I need to regrid temperature dataset from 1 degree to 0.5 degree. In case we have data available for all grids falling in a square, as shown below, we can simply regrid it using bilinear/bicubic ...
6
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1answer
783 views

Specific humidity range in tropical lowlands?

I am running a land biosphere model that uses meteorological data as drivers. The model has a threshold of 32g/kg for specific humidity. The data I am using taken from a reanalysis performed by J. ...
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4answers
5k views

Why has CO2 decreased in the history of the Earth?

I noticed that the $\ce{CO2}$ is actually decreasing in the eon time. My guess is lush vegetation or forests began to grow which absorbed the $\ce{CO2}$ by photosynthesis? Would anyone give me any ...
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170 views

El Niño Spring Barrier - optimal time to run a long range climate forecast

In an answer to this question - What is the predictability of El Niño/La Niña? Isopycnal Oscillation talks about a "decrease in skill during the boreal spring as SST anomalies are ...
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129 views

Will global climate change alter the interannual and/or intraseasonal variance of temperature and/or precipitation?

A quick skim of the regional chapters in AR5 shows predicted changes to average temperature and precipitation. If I understand (in rough terms) the modelling methodologies used, a variety of models (...
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1answer
346 views

Can climate models reliably predict meteorological extremes?

This question is related to and extension of my previous question which was about the methodology used to predict future climatic extremes: What is the methodology to analyze future climatic extremes ...
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1answer
340 views

What is the predictability of El Niño/La Niña?

What is the maximum period of time into the future that an El Niño event can be forecasted with reasonable accuracy and what are the limitations in predicting the time limit?
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1answer
373 views

What is the methodology to analyze future climatic extremes using the results of climate models?

What is the accepted methodology to predict future climatic extremes using the results of climate models? I have recently read a report about climatic extremes considering climate change (MICE, 2002)....
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1answer
1k views

How much would the Greenland landmass isostatic rebound contribute to long term climate change?

In reading the question What would the geology and climate of a supposed landmass near the pole be like, assuming a thoroughly warmer planet?, it came to mind that another factor may cause a shift in ...
21
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1answer
648 views

Significant difference between averaged wind speeds and averaged wind power density, for wind generation modelling?

Climate models outputs, particularly the reanalysis datasets, output wind speeds as zonal and meridional averages for the modelled time period (typically 1, 3 or 6 hours). So we get a 2-dimensional ...
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2answers
383 views

Are there any general-purpose climate-model coupling projects?

In climate modelling, there are three major model types that form the basis of a fully coupled Atmosphere-Ocean General Circulation Model (AOGCM): Atmosphere circulation models Ocean circulation ...
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3answers
709 views

How good were climate models of the 1990s at predicting the global temperature trends of the 2000s/2010s?

Was there a significant bias between the ensemble of climate models and the long-term temperature trends? What about spatial patterns?
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2answers
176 views

Are clouds significantly easier to simulate in weather models than climate models?

Cloud forcing is still one of the major uncertainties of radiative forcing in climate modeling because there are so many uncertainties in it (and parametrizations). But also because the timescale of ...
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1answer
93 views

Alternatives to Plant Functional Types as parametrisations in land surface models?

Plant Functional Types (PFTs) are a discretisation of global vegetation types. They are used in land surface models to parametrise many values, including albedo, various photosynthesis parameters, and ...
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2answers
1k views

Why does the El Niño Stop?

The reason for the initiation of the El Niño is unknown, but what is well known is how it progresses once initiated. The West Pacific warm pool begins to drift East, and the strength of the trade ...
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5answers
5k views

Is it true that a butterfly flapping its wings can result in a tornado in a distant location?

I have heard that extreme storm events can be caused simply by a butterfly flapping its wings somewhere in a distant location. Is it true that such a small disturbance in the air in one location can ...