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In VI – Australia CanESM2, CSIRO, Miroc and MRI compared vs history we looked at how each model thought rainfall had changed in Australia over about 100 years, and we compared that to observations. We did this for annual rainfall, also for Australian summer (Dec, Jan, Feb) and Australian winter (Jun, Jul, Aug).

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Note that we are not comparing the end of the 21st century from the model with observations at the end of the 20th century. That produces much different results – the model’s view of recent history doesn’t match observations very well. We are comparing the model future with the model past. So we are asking the model to say how it sees rainfall changing as a result of different amounts of CO2 being emitted.

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• RCP4.5 – with current trends continuing we are something like RCP6. I think of RCP4.5 as being “what we are doing now” but with some substantial reductions in CO2 emissions. But it’s nothing like RCP2.6, which is more “project Greta” where emissions basically stop in a decade
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Each pair of graphs is future RCP4.5 as % of recent past, and RCP8.5 as % of recent past. The four models, clockwise from top left – MPI (Germany), Miroc (Japan), CSIRO (Australia) and CAN (Canada):

Figure 1 – Click to expand

And now the same, but only looking at Australian summer, DJF:

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Depending on which model you like, things could be really bad, or really good, or about the same with “climate change”.

Note that the color scale I’m using here is the same as the last article, but different from all the earlier articles, the % range is from 50% to 150% (rather than 0% to 200%).

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An overview of CMIP5 and the experiment design, Taylor, Stouffer & Meehl, AMS (2012)

GPCP data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at lan 灯 破解版

GPCC data provided from http://psl.noaa.gov/data/gridded/data.gpcc.html

CMIP5 data provided by the portal at http://esgf-data.dkrz.de/search/cmip5-dkrz/

In V – CanESM2, CSIRO, Miroc and MRI compared we compared four models among themselves for two future scenarios of CO2 emissions, and also the four models compared with historical observations.

Here we zero in on Australia. Let’s compare all months 1979-2005, i.e. recent history with around 100 years before that, all months 1891-1910 (note 1).

This first figure is a % comparison. Each map is annual data: average 1979-2005 % of average 1891-1910. Note that the color scale I’m using here is different from previous articles, the % range is from 50% to 150% (rather than 0% to 200%).

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Figure 1 – Click to expand

So we are seeing how well the models compare among themselves, and with observations, for a century or so change. All of the models are run with the identical set of conditions (the best estimate of forcings like CO2, aerosols, etc) – that’s what CMIP5 is all about.

This second graphic is % comparison over Australian summer: December, January, February (DJF). It is otherwise exactly the same as the figure 1:

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The annual model comparisons look “better” than the summer (DJF) comparisons.

With the DJF comparisons, Australian summer observations across a century have the western half of Australia wetter, and coastal Queensland (that’s the right edge from halfway up) drier. Also some inland NSW regions drier.

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Place yourself back in 1900. You have these models, how useful are they for predicting 100 years ahead what would happen to summer rainfall?

References

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GPCP data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at http://psl.noaa.gov/

GPCC data provided from http://psl.noaa.gov/data/gridded/data.gpcc.html

CMIP5 data provided by the portal at http://esgf-data.dkrz.de/search/cmip5-dkrz/

Notes

Note 1: The choice of dates is constrained by:

• 1891 being the start of the GPCC observational dataset
• 1979 being the start of the satellite era
• 2005 being the end date that this class of models ran to for their “historical” simulation – CMIP5 historical simulations were from 1850-2005

As a result, lots of comparisons in climate papers involve 1979-2005, so even though we aren’t using satellite data here, I have been using that 27-year period.

Note 2: Each model output is the median of all of the simulations

In the last article we looked at a comparison between Miroc (Japanese climate mode) and MPI (German climate model). See that article for more details.

Now we add CanESM2 and CSIRO-Mk3-6-0 to the comparison.

CanESM2 is a Canadian climate model, with an ESM component – this is an earth system model, basically it means that CO2 emissions are explicitly controlled, but not the atmospheric CO2 concentration (so the model simulates aspects of the carbon cycle). Their model has 5 historical simulations and 5 each each of three RCPs (skipping RCP6 like many other CMIP5 contributors)

CSIRO-Mk3-6-0 is an Australian model. Their model has 3 historical simulations and 10 each of the four RCPs.

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Figure 1 – MPI, Miroc, CAN & CSIRO for RCP4.5 (%) – Click to expand

And for RCP8.5 for 2081-2100

Figure 2 – MPI, Miroc, CAN & CSIRO for RCP8.5 (%) – Click to expand

 

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Figure 3 – MPI, Miroc, CAN & CSIRO historical runs compared with GPCC over the same 1979-2005 period – Click to expand

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In Models and Rainfall – III – MPI Seasonal and Models and Rainfall – II – MPI we looked at one model, MPI from Germany, from a variety of perspectives.

In this article we’ll look at another model that took part in the last Climate Model Intercomparison Project (CMIP5) – Miroc5 from Japan and compare it with MPI.

A reminder from an earlier article – the scenarios (Representative Concentration Pathways) in brief (and see van Vuuren reference below):

• rcp2.6 – large reductions in CO2 emissions within a short space of time. Conceptual model – shutting off the world’s power stations, and no burning of fossil fuels, by 2030. Think: Project Greta
• rcp 4.5 – substantial improvements in reducing CO2 emissions
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• rcp 8.5 – extreme CO2 emissions, often misleadingly cited as “business as usual” (see Opinions and Perspectives – 3 – How much CO2 will there be? And Activists in Disguise and Opinions and Perspectives – 3.5 – Follow up to “How much CO2 will there be?”)

Miroc5 (just called Miroc in the rest of the article) did five simulations of historical and three simulations of each RCP through to 2100.

The first graphic has five maps: first, the median Miroc simulation of 1979-2005, followed by simulations of 2081-2100 for rcp2.6 to rcp8.5 (each one is the median of the three simulations):

Figure 1 – Miroc simulations of historical 1979-2005 and the 4 RCPs in 2081-2100 – Click to expand

The % change of the median Miroc simulation for each scenario from the median historical simulation:

We can see a consistent theme through increasing CO2 concentrations.

Figure 2 – Miroc simulations for RCPs 2081-2100 as % of Miroc historical 1979-2005 – Click to expand

As the previous figure, but difference (future – historical):

Figure 3 – Miroc simulations for RCPs 2081-2100 less Miroc historical 1979-2005 – Click to expand

Side by Side Comparisons of MPI and Miroc Predictions

And now some comparisons side by side. On the left MPI, on the right Miroc. Both are comparing RCP4.5 as a percentage of their own historical simulation (and both are the medians of the simulations):

Figure 4 – MPI compared with Miroc for RCP4.5 (%) – Click to expand

I think seeing the future less historical (as a difference rather than %) is also useful – in areas with very low rain the % difference can appear extreme even though the impact is very low. Overall, % graphs are more useful – if you live in an area with say 20mm of rainfall per month on average then -10mm might not show up very well on a difference chart, but it can be critical. But for reference, the difference:

Figure 5 – MPI compared with Miroc for RCP4.5 (difference) – Click to expand

Now the same two graphs for RCP8.5. On the left MPI, on the right Miroc. % of their historical simulation in each case:

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And now difference (future less historical) in each case:

Figure 7 – MPI compared with Miroc for RCP8.5 (difference) – Click to expand

Side by Side Comparisons of Models vs Observations

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Figure 8 – MPI compared with Miroc for GPCC observations (%) – Click to expand

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References

An overview of CMIP5 and the experiment design, Taylor, Stouffer & Meehl, AMS (2012)

GPCP data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at http://psl.noaa.gov/

GPCC data provided from http://psl.noaa.gov/data/gridded/data.gpcc.html

CMIP5 data provided by the portal at http://esgf-data.dkrz.de/search/cmip5-dkrz/

The representative concentration pathways: an overview, van Vuuren et al, Climatic Change (2011)

 

In the last article we looked at the MPI model – comparisons of 2081-2100 for different atmospheric CO2 concentrations/emissions with 1979-2005. And comparisons between the MPI historical simulation and observations. These were all on an annual basis.

This article has a lot of graphics – I found it necessary because no one or two perspectives really help to capture the situation. At the end there are some perspectives for people who want to skip through.

In this article we look at similar comparisons to the last article, but seasonal. Mostly winter (northern hemisphere winter), i.e. December, January, February. Then a few comparisons of northern hemisphere summer: June, July, August. The graphics can all be expanded to see the detail better by clicking on them.

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Here we see the historical simulation over DJF 1979-2005 (1st graph) followed by the three scenarios, RCP2.6, RCP4.5, RCP8.5 over DJF 2080-2099:

Figure 1 – DJF Simulations from MPI-ESM-LR for historical 1979-2005 & 3 RCPs 2080-2099 – Click to expand

Now the results are displayed as a difference from the historical simulation. Positive is more rainfall in the future simulation, negative is less rainfall:

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And the % change. The Saharan changes look dramatic, but it’s very low rainfall turning to zero, at least in the model. For example, I picked one grid square, 20ºN, 0ºE, and the historical simulated rainfall was 0.2mm/month, under RCP2.6 0.05mm/month and for RCP8.6 0mm/month.

Figure 3 – DJF Simulations from MPI-ESM-LR for 3 RCPs in 2080-2099 as % of simulation of historical 1979-2005 – Click to expand

I zoomed in on Australia – each graph is absolute values. The first is the historical simulation, then the 2nd, 3rd, 4th are the 3 RCPs as before:

Figure 4 – DJF Australia – simulations from MPI-ESM-LR for historical 1979-2005 & 3 RCPs 2080-2099 – Click to expand

Then differences from the historical simulation:

Figure 5 – DJF Australia – Simulations from MPI-ESM-LR for 3 RCPs in 2080-2099 minus simulation of historical 1979-2005 – Click to expand

Then percentage changes from the historical simulation:

Figure 6 – DJF Australia – Simulations from MPI-ESM-LR for 3 RCPs in 2080-2099 as % of simulation of historical 1979-2005 – Click to expand

And the same for Europe – each graph is absolute values. The first is the historical simulation, then the 2nd, 3rd, 4th are the 3 RCPs as before:

Figure 7 – DJF Europe – simulations from MPI-ESM-LR for historical 1979-2005 & 3 RCPs 2080-2099 – Click to expand

Then differences from the historical simulation:

Figure 8 – DJF Europe – Simulations from MPI-ESM-LR for 3 RCPs in 2080-2099 minus simulation of historical 1979-2005 – Click to expand

Then percentage changes from the historical simulation:

Figure 9 – DJF Europe – Simulations from MPI-ESM-LR for 3 RCPs in 2080-2099 as % of simulation of historical 1979-2005 – Click to expand

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Figure 10 – JJA Simulations from MPI-ESM-LR for historical 1979-2005 & 3 RCPs 2080-2099 – Click to expand

Now the results are displayed as a difference from the historical simulation. Positive is more rainfall in the future simulation, negative is less rainfall:

Figure 11 – JJA Simulations from MPI-ESM-LR for 3 RCPs in 2080-2099 minus simulation of historical 1979-2005 – Click to expand

And the % change:

Figure 12 – JJA Simulations from MPI-ESM-LR for 3 RCPs in 2080-2099 as % of simulation of historical 1979-2005 – Click to expand

Modeled History vs Observational History

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Figure 13 – DJF 1979-2005 GPCC Observational data & Median of all MPI historical simulations – Click to expand

The difference, so blue means the model produces more rain than reality, while red means the model produces less rain:

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And percentage change:

Figure 15 – DJF 1979-2005 Median of all MPI historical simulations as % of GPCC Observational data – Click to expand

Some Perspectives

Now let’s look at annual, DJF and JJA for how simulation compare with observations, this is median MPI less GPCC – like figure 13. You can click to expand the image:

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Another perspective, compare projections of climate change with model skill. Top is skill (MPI simulation of DJF 1979-2005 less GPCC observation), bottom left is 2081-2100 RCP2.6 less MPI simulation, bottom right is RCP8.5 less MPI simulation:

Figure 17 – DJF Compare model skill with projections of climate change for RCP2.6 & RCP8.5 – Click to expand

So let’s look at it another way.

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Figure 18 – DJF Compare model projections with actual historical – Click to expand

And the same for annual:

Figure 19 – Annual Compare model projections with actual historical – Click to expand

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Figure 20 – For contrast, as figure 19 but compare with model historical – Click to expand

If we look at SW Africa, for example, we see a progressive drying from RCP2.6 (drastic cuts in CO2 emissions) to RCP8.5 (very high emissions). But if we look at figure 19 then the model projections at the end of the century for that region have more rainfall than current.

If we look at California we see the same kind of progressive drying. But compare model projections with observations and we see more rainfall in California under both those scenarios.

Of course, this just reflects the fact that climate models have issues with simulating rainfall, something that everyone in climate modeling knows. But it’s intriguing.

In the next article we’ll look at another model.

References

An overview of CMIP5 and the experiment design, Taylor, Stouffer & Meehl, AMS (2012)

GPCP data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at http://psl.noaa.gov/

GPCC data provided from http://psl.noaa.gov/data/gridded/data.gpcc.html

CMIP5 data provided by the portal at http://esgf-data.dkrz.de/search/cmip5-dkrz/

The representative concentration pathways: an overview, van Vuuren et al, Climatic Change (2011)

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In this, and some subsequent articles, I’ll try and provide some level of detail.

Here are some comparisons from a set of models from the Max Planck Institute for Meteorology. MPI is just one of about 20 climate modeling centers around the world. They took part in the Climate Model Intercomparison Project (CMIP5). As part of that project, for the IPCC 5th assessment report (AR5), they ran a number of simulations. Details of CMIP5 in the Taylor et al reference below.

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Here is the % change in rainfall – 2081-2100 vs 1979-2005 from one of the MPI models (MPI-ESM-LR) for 3 scenarios. The median of 3 runs for each scenario is compared with the median of 3 runs for the historical period, and we see the % change:

Figure 1 – Simulations from MPI-ESM-LR for 3 RCPs vs simulation of historical – Click to expand

The scenarios (Representative Concentration Pathways) in brief (and see van Vuuren reference below):

• rcp2.6 – large reductions in CO2 emissions within a short space of time. Conceptual model – shutting off the world’s power stations, and no burning of fossil fuels, by 2030
• rcp 4.5 – substantial improvements in reducing CO2 emissions
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• rcp 8.5 – extreme CO2 emissions, often misleadingly cited as “business as usual” (see 天真网 - 专注资讯活动、软件、教程、资源、技术分享 、总之 ...:2021-5-9 · 天真网致力于做全网最大的免费网络资源分享平台,为广大网民提供优质的资源！用我一生，换你十年天真无邪！干货资源 无损音乐下载软件：MusicTools 喜欢听歌，也曾买过无损音乐播放器来听歌，但是自己的耳朵不“开窍”对于无损、高品质这类音乐还是分辨不出来。 and Opinions and Perspectives – 3.5 – Follow up to “How much CO2 will there be?”)

We can see that rcp 2.6 has some small reductions in rainfall in northern Africa, Middle East and a few other regions. RCP 8.5 has large areas of greatly reduced rainfall in northern Africa, Middle East , SW Africa, the Amazon, and SW Australia.

So from a model only point of view the less emissions the better.

It’s common to find that RCP6 is not modeled, something that I find difficult to understand. I understand that computing time is valuable but RCP6 seems like the emissions pathway we are currently on.

Perhaps it should be explicitly stated that the simulation results of RCP4.5 and RCP6 are effectively identical – if that is in fact the case. That by itself would be useful information given that there is a substantial difference in CO2 emissions between them.

I had a look at a couple of regions of interest – Australia:

Figure 2 – Australia – Simulations from MPI-ESM-LR for 3 RCPs vs simulation of historical – Click to expand

And Europe:

Figure 3 – Europe – Simulations from MPI-ESM-LR for 3 RCPs vs simulation of historical – Click to expand

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Here we compare the historical MPI model runs with observations (GPCC). MPI has 3 models and a total of 8 runs:

• MPI-ESM-LR (3 simulations)
• MPI-ESM-MR (3 simulations)
• MPI-ESM-P (2 simulations)

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I compared the median of each model with GPCC over the last 27 years of the ‘historical’ period, 1979-2005:

Figure 4 – The median of simulations from each MPI model vs observation 1979-2005 – Click to expand

And the % difference of each MPI model vs GPCC over the same period:

Figure 5 – The median of simulations from each MPI model, % change over observation 1979-2005 – Click to expand

The different models appear quite similar. So let’s take the median of all 8 runs across the 3 models and compare with observations (GPCC) for clarity (the graph title isn’t quite correct, this is across the 3 models):

Figure 6 – The median of simulations from all MPI models, % change over observation 1979-2005 – Click to expand

The same, highlighting Australia:

Figure 7 – Australia – median of simulations from all MPI models, % change over observation 1979-2005 – Click to expand

And highlighting Europe:

 

Figure 8 – Europe – median of simulations from all MPI models, % change over observation 1979-2005 – Click to expand

I’m not trying to draw any big conclusions here, more interested in showing what model results look like.

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If you want to draw conclusions from a climate model on rainfall, should you compare the future simulations with the simulation of the recent past? Or future simulations with actual observations? Or should you compare past simulations with actual and then decide whether to compare future simulations with anything?

References

An overview of CMIP5 and the experiment design, Taylor, Stouffer & Meehl, AMS (2012)

GPCP data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at http://psl.noaa.gov/

GPCC data provided from http://psl.noaa.gov/data/gridded/data.gpcc.html

CMIP5 data provided by the portal at http://esgf-data.dkrz.de/search/cmip5-dkrz/

The representative concentration pathways: an overview, van Vuuren et al, Climatic Change (2011)

Here’s an extract from a paper by Mehran et al 2014, comparing climate models with observations, over the same 1979-2005 time period:

Click to enlarge

The graphs show the ratios of models to observations. Therefore, green is optimum, red means the model is producing too much rain, while blue means the model is producing too little rain (slightly counter-intuitive for rainfall and I’ll be showing data with colors reversed).

You can easily see that as well as models struggling to reproduce reality, models can be quite different from each other, for example the MPI model has very low rainfall for lots of Australia, whereas the NorESM model has very high rainfall. In other regions sometimes the models mostly lean the same way, for example NW US and W Canada.

For people who understand some level of detail about how models function it’s not a surprise that rainfall is more challenging than temperature (see Opinions and Perspectives – 6 – Climate Models, Consensus Myths and Fudge Factors).

But this challenge makes me wonder about drawing a solid black line through the median and expecting something useful to appear.

Here is an extract from the recent IPCC 1.5 report:

I’ll try to shine some light on the outputs of rainfall in climate models in subsequent articles.

References

Note: these papers should be easily accessible without a paywall, just use scholar.google.com and type in the title.

Evaluation of CMIP5 continental precipitation simulations relative to satellite-based gauge-adjusted observations, Mehran, AghaKouchak, & Phillips, Journal of Geophysical Research: Atmospheres (2014)

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The datasets are accessible in websites below – there are options to plot specific regions, within specific dates, and to download the whole dataset as a .nc file.

GPCC – http://psl.noaa.gov/data/gridded/data.gpcc.html

GPCP – http://psl.noaa.gov/data/gridded/data.gpcp.html