Use of CESM1/2 in MAXENT SDM modelling

[jackwhitehead1001]

Hi there,

I am a BSc geography student and i am looking to integrate output data from a previously ran CESM model into SDM Maxent (within R Studio) in order to predict future distributions of coral species under climate change. Since this is evidently going to require ocean based models i believe POP2 would be useful. However, I am confused about how to download previously ran model data, which variables that are available within POP2 and how to use them, and whether this is actually possible! any advice would be greatly appreciated.

Thanks,
Jack

 

[strandwg]

Hi there,

I am a BSc geography student and i am looking to integrate output data from a previously ran CESM model into SDM Maxent (within R Studio) in order to predict future distributions of coral species under climate change. Since this is evidently going to require ocean based models i believe POP2 would be useful. However, I am confused about how to download previously ran model data, which variables that are available within POP2 and how to use them, and whether this is actually possible! any advice would be greatly appreciated.

Thanks,
Jack

There are many ocean datasets from previous CESM runs at

NSF NCAR Climate Data Gateway

www.earthsystemgrid.org

What future scenario(s) would be appropriate for your research?

 

[jackwhitehead1001]

There are many ocean datasets from previous CESM runs at

NSF NCAR Climate Data Gateway

www.earthsystemgrid.org

What future scenario(s) would be appropriate for your research?

Hi,

Ideally i would like to use RCP scenarios (preferably RCP4.5 and 6) up until 2050 and I am looking to explore SST anomaly, salinity, light penetration, aragonite saturation state, and current velocity. Is this helpful information to help answer your question?

thanks

 

[jackwhitehead1001]

There are many ocean datasets from previous CESM runs at

NSF NCAR Climate Data Gateway

www.earthsystemgrid.org

What future scenario(s) would be appropriate for your research?

apologies for replying to this again but ive done some digging.

this model looks good Dataset: CESM2.1 run b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.001, Ocean Post Processed Data, Monthly Averages, version 2

however i have some questions about it. 1) what does WACCM stand for, 2)it says access is restricted to CCSM users - how do i access this, 3) does this model come with rcp future scenario capabilites eg can i apply use RCP future scenarios with this model?

thanks so much for your help
Jack

 

[strandwg]

apologies for replying to this again but ive done some digging.

this model looks good Dataset: CESM2.1 run b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.001, Ocean Post Processed Data, Monthly Averages, version 2

however i have some questions about it. 1) what does WACCM stand for, 2)it says access is restricted to CCSM users - how do i access this, 3) does this model come with rcp future scenario capabilites eg can i apply use RCP future scenarios with this model?

thanks so much for your help
Jack

That's not a run appropriate for what you want, as it's a simulation of the 1850-2014 period, not the future as you want.

All CESM data on the gateway are open - registration is required but automatic.

We have an ensemble of the older CMIP5 RCP4.5 simulations at

Dataset: CESM1 CAM5 BGC Medium Ensemble

www.earthsystemgrid.org

Ocean data from them are located at

https://www.earthsystemgrid.org/dataset/ucar.cgd.ccsm4.CESM_CAM5_BGC_ME.ocn.proc.monthly_ave.html

and a guide to field names is at

CESM-CAM5-BGC LENS fields complete list

I'm happy to answer any questions you have.

 

[jackwhitehead1001]

That's not a run appropriate for what you want, as it's a simulation of the 1850-2014 period, not the future as you want.

All CESM data on the gateway are open - registration is required but automatic.

We have an ensemble of the older CMIP5 RCP4.5 simulations at

Dataset: CESM1 CAM5 BGC Medium Ensemble

www.earthsystemgrid.org

Ocean data from them are located at

https://www.earthsystemgrid.org/dataset/ucar.cgd.ccsm4.CESM_CAM5_BGC_ME.ocn.proc.monthly_ave.html

and a guide to field names is at

CESM-CAM5-BGC LENS fields complete list

I'm happy to answer any questions you have.

Hi,

When using the link to access the data it says that the data is not available for download (see attached screenshot). Is there any way to access this?



thanks

 

[strandwg]

Hi,

When using the link to access the data it says that the data is not available for download (see attached screenshot). Is there any way to access this?

View attachment 2881

thanks

I'll have access restored ASAP. Apologies for the oversight.

 

[jackwhitehead1001]

I'll have access restored ASAP. Apologies for the oversight.

Brilliant - thank you very much for your help!!

 

[strandwg]

Brilliant - thank you very much for your help!!

The data will likely not be available until early next week, as other publishing tasks are ahead of these data in the queue.

The RCP scenarios are a bit out of date. Are you heavily invested in using them? The more recent CMIP6 SSP scenarios are much more used currently.

 

[jackwhitehead1001]

The data will likely not be available until early next week, as other publishing tasks are ahead of these data in the queue.

The RCP scenarios are a bit out of date. Are you heavily invested in using them? The more recent CMIP6 SSP scenarios are much more used currently.

Hi,

I am not necessarily that invested in using them though. However I would have to do some research tomorrow about whether these would be applicable to my study. Would it be okay if I spoke to my dissertation supervisor about this? If you could could you send me the link to the SSP scenarios so I can have a look at them?

 

[strandwg]

Hi,

I am not necessarily that invested in using them though. However I would have to do some research tomorrow about whether these would be applicable to my study. Would it be okay if I spoke to my dissertation supervisor about this? If you could could you send me the link to the SSP scenarios so I can have a look at them?

There are many resources describing the SSPs. Here's one:

https://www.researchgate.net/publication/343637671_The_shared_socio-economic_pathway_SSP_greenhouse_gas_concentrations_and_their_extensions_to_2500

 

[jackwhitehead1001]

There are many resources describing the SSPs. Here's one:

https://www.researchgate.net/publication/343637671_The_shared_socio-economic_pathway_SSP_greenhouse_gas_concentrations_and_their_extensions_to_2500

Hi there,

I have a couple questions about using the SSPs. If i was to use these, is there a comparative historical run using the same model? Since i am using species distribution models, I want to use a run of the model using historic data in order to calculate current species distributions, and then utilise runs of the same model using SSPs or RCPs to project future distributions. With the CMIP5 CAM simulations i think i saw both historic and future prediction model runs. Is there CESM model runs for historic predictions which have then subsequently been run with SSP future scenarios? Hopefully this makes sense but if you need me to elaborate then please say.

thanks

 

[strandwg]

If you want to do a more complete study, use the CMIP6 archive instead of just CESM. There's output from many climate models, not just one.

You can start at

https://esgf-node.llnl.gov/search/cmip6/

 

[jackwhitehead1001]

If you want to do a more complete study, use the CMIP6 archive instead of just CESM. There's output from many climate models, not just one.

You can start at

https://esgf-node.llnl.gov/search/cmip6/

Hi,

I have been trying to explore the larger CMIP6 datatset but I am a novice to this and I cant really understand what all the acronyms mean in the file name nor how to navigate the site in order to find ocean-based models with the correct variables i need. Is there a data catalogue or something similar where i can explore the different models and also find out what the acronyms mean in the titles of the documents (in particular the OMIP studies)?

I also want to use only one model as despite this being less academically rigorous it reduces complexity for my project and also means that the methodology and parameterisation is relatively standardised for both historical and future runs of the model. The reason i was keen to use CESM1 is because it has been used previously in coral reef studies and therefore i know that it would have all the variables i would want. Does CESM2 have an Ocean-based model which explores salinity and temperature with both historic data as well as future model runs using SSP/RCP pathways?

Thanks

 

[jackwhitehead1001]

If you want to do a more complete study, use the CMIP6 archive instead of just CESM. There's output from many climate models, not just one.

You can start at

https://esgf-node.llnl.gov/search/cmip6/

Hi again,

I spoke to my dissertation supervisor and I think we both agree that using the CESM1 CAM5 data would be best. Would it be okay if you make this data available on the website? I do not need this desperately so if it takes a week or so that’s fine but could you let me know when it’s been made available?

Thanks

 

[strandwg]

Hi again,

I spoke to my dissertation supervisor and I think we both agree that using the CESM1 CAM5 data would be best. Would it be okay if you make this data available on the website? I do not need this desperately so if it takes a week or so that’s fine but could you let me know when it’s been made available?

Thanks

To be clear, CESM1 with CAM5 is an older version of the model, not the current version (CESM2 using CAM6).

CESM1 with CAM5 was used in our CMIP5 submission as well as the CESM1 Large Ensemble (RCP8.5) and the CESM1 Medium Ensemble (RCP4.5).

A description of the variable names and what they are, suitable for both of the above sets, is at

CESM-CAM5-BGC LENS fields complete list

 

[strandwg]

Hi again,

I spoke to my dissertation supervisor and I think we both agree that using the CESM1 CAM5 data would be best. Would it be okay if you make this data available on the website? I do not need this desperately so if it takes a week or so that’s fine but could you let me know when it’s been made available?

Thanks

Just FYI, the output CESM1 "medium ensemble" (RCP4.5) is now available again at

Dataset: CESM1 CAM5 BGC Medium Ensemble

www.earthsystemgrid.org

Thanks for your patience.

 

[jackwhitehead1001]

Hi there,

thank you for all your work on this it is much appreciated!

I am having problems using the CESM 2.1 piControl Ocean post processed dataset. When i loaded the .nc files into r studio it appears that they do not have an assigned crs. Do you know what crs the model projections are projected onto? Have i downloaded the files wrong? It is causing a few problems in r since for my research the files require a crs whereas the files crs currently is 'NA'.

Thanks

 

[strandwg]

Hi there,

thank you for all your work on this it is much appreciated!

I am having problems using the CESM 2.1 piControl Ocean post processed dataset. When i loaded the .nc files into r studio it appears that they do not have an assigned crs. Do you know what crs the model projections are projected onto? Have i downloaded the files wrong? It is causing a few problems in r since for my research the files require a crs whereas the files crs currently is 'NA'.

Thanks

CESM output doesn't use a coordinate reference. It considers the earth a perfect sphere with a radius of ~6.37122 * 10^6 meters.