EdGCM Forums http://forums.edgcm.columbia.edu/ EdGCM discussions on Climate en Wed, 25 Nov 2009 03:29:52 GMT vBulletin 60 http://forums.edgcm.columbia.edu/images/misc/rss.jpg EdGCM Forums http://forums.edgcm.columbia.edu/ Testing boundary conditions http://forums.edgcm.columbia.edu/showthread.php?t=840&goto=newpost Tue, 24 Nov 2009 17:18:18 GMT As part of becoming familiar with EdGCM, and using the results in my high school course, I'm fiddling with various runs of the control run set-up with changes to single elements like axial tilt. I have two questions:

1) I'd like to run a simulation of the sun as a variable star (for instance a delta Cephied type short period variable). I see the ability to put in luminosity trends but it does not seem that a periodic function is an option. Is a data file input the only way to do this without a recompile?

2) I'd like to try assorted, mythical, continent configurations. Where is that data stored and is it reasonable to try to develop a custom input file?

3) Can continents be removed altogether? (why? as part of a lesson plan on global winds mostly.)

4) At some point my fiddling like this presumably requires a different model initialization then the control run set-up. Any particular documentation I should be sure to read? For now I am simply trying to let the model run long enough that I have some confidence it has settled down into the new conditions. Generally I have been letting it go for 50 years and using the time series data to get a feel for how close to some sort of equilibrium the model is. ]]> Science and Modeling Questions crimsonwombat http://forums.edgcm.columbia.edu/showthread.php?t=840 Trouble starting a new run http://forums.edgcm.columbia.edu/showthread.php?t=839&goto=newpost Tue, 10 Nov 2009 23:31:06 GMT Hello, I am a new EdGCM user and have a question. I put together a run with estimated early Holocene values, but cannot get it to process. I press... Hello, I am a new EdGCM user and have a question. I put together a run with estimated early Holocene values, but cannot get it to process. I press the play button and it does not run. It does not point out any errors, but I do receive the following message:

13

===== The GCM is no longer running =====

I tried a few things that I saw in the forum, like switching to a different run and closing 4D, but none of those seem to help. I'm not sure if some of the conditions I'm trying to use are problematic. I've attached a .XML with how I have it set up, if it might be of use to anyone. Thanks much for your time, I appreciate it.
Attached Files
File Type: xml Holocene_run.XML (10.1 KB)
]]> Technical Support ak_modeling http://forums.edgcm.columbia.edu/showthread.php?t=839 EdGCM in a high school program http://forums.edgcm.columbia.edu/showthread.php?t=838&goto=newpost Tue, 20 Oct 2009 16:07:38 GMT We are new to using EdGCM in our program here at Morristown-Beard School but there are aspects of our science curriculum which are perhaps unusual... We are new to using EdGCM in our program here at Morristown-Beard School but there are aspects of our science curriculum which are perhaps unusual enough to warrant sharing with a larger community.

Generally, EdGCM seems to be most heavily used at the university level and there are certainly challenges to using it at the high school level. Here is how we are addressing the challenges over the course of a year long curriculum.

We are using the 2007 IPCC report, and climate modeling generally, as a year long framework for a course we call Advanced Geosciences. This course is our 12th grade capstone course for our science curriculum. Some years ago we embarked on a switch of our science curriculum from the traditional Earth, Bio, Chem, Physics model to a flipped version: 9th: Physics, 10th: Chemistry, 11th: Biology, 12th: Geosciences. There are two rationales for this, one based on content and one based on the readiness of students for abstract problem solving. Since earth/geo sciences are the application of biology, chemistry and physics content areas it makes sense to us to build the foundation before trying to use it. A further justification for the flip involves the level of abstraction required for the material. Physics can be taught with a very hands on, macroscopic approach. Chemistry involves hands-on application of formal mathematical models but to microscopic or statistical phenomena. Biology requires a more abstract organization of complex information and earth systems contains a bewildering array of of complex cycles and interactions with little in the way of a linear path through the material.

Getting to EdGCM, this approach to our curriculum means that we can create a 12th grade course for students with well developed math skills (we do not require calculus but half the students are concurrently taking calculus) and fairly well developed abstract reasoning skill. At this early stage of the year we have not yet started to use EdGCM but we are developing a mathematical understanding of climate modeling starting with EBMs, through RCMs, EMICs and ultimately ending with fully coupled GCMs and EdGCM in particular. For the early stages we are using the STELLA dynamic systems modeling software to work our way through the development of the simpler models. As a background text for the faculty we use Marshall and Plumb's Atmosphere, Ocean, and Climate Dynamics. The students are NOT using this book. For the students we are having some success with Kump et al - The Earth System which takes a very strong systems approach to the geosciences. This course is taught at both a mathematically sophisticated honors level and a less rigorous regular level. 80% of our seniors are moving through this curriculum (the rest tend to be taking an AP level science). If such a thing existed, our honors GeoSci course would probably be viewed as an AP-like college level introduction.

Thus far this approach is proving to be extremely successful. In lecture the mathematical formalism can be provided and the students can get an intuitive feel for model sensitivity by using run-time version of the model in the STELLA software. Ultimately, as the models become more complex, the mathematics will exceed what can be presented at the high school level but we hope to have developed an intuitive understanding of the approaches and sensitivity issues before we reach that point.

Ultimately we are using this overall framework to motivate a more general survey of earth systems. For instance we will cover plate tectonics from the perspective of the effect continent location has on long term climate evolution and we can investigate earth's orbital dynamics by actually playing with simple EBMs which allow for changes in orbital characteristics and running the glaciation scenarios in EdGCM. Essentially we are moving through a traditional earth systems survey course but with a consistent perspective of climate change and climate modeling.

This is our first year with the fully involved modeling approach and the honors level curriculum but thus far it has the students extremely engaged and is working very well. I can say that this material can be within the grasp of upper division high school students. ]]> Community Showcase crimsonwombat http://forums.edgcm.columbia.edu/showthread.php?t=838 EdGCM 3.2.1 released http://forums.edgcm.columbia.edu/showthread.php?t=835&goto=newpost Tue, 15 Sep 2009 19:45:35 GMT The latest release of EdGCM (3.2.1 build 926) includes bug fixes and enhancements for both Mac and Windows versions, as well as updated manuals for... The latest release of EdGCM (3.2.1 build 926) includes bug fixes and enhancements for both Mac and Windows versions, as well as updated manuals for both EdGCM and EVA. The fully functional EdGCM 3.2.1 runs in demo mode for 30 days, after which licensing is required. Software registration and purchasing can be done our online store or via purchase order. For more information about purchasing EdGCM, including educational pricing, see our purchasing info page: http://edgcm.columbia.edu/download-edgcm/purchasing/

If you have recently downloaded an EdGCM demo copy, please check the build number of your demo. (You can see it at the very top of the EdGCM toolbar, written as "EdGCM 3.2 (build#) Toolbar".) If the build number is prior to 926, we strongly encourage you to download a new demo copy from http://edgcm.columbia.edu/download-edgcm/ because earlier builds contained a registration key bug.


WHAT'S NEW

As of version 3.2, EdGCM is no longer being distributed for free. We regret having to transition to paid licenses, but the EdGCM Project and our support of the software cannot continue to exist without some financial resources.

We are dedicated to keeping EdGCM available, because the feedback we have received from our many users confirms that there is a strong need for the kind of hands-on climate modeling experience that only EdGCM provides. Your ongoing support is vital to our success.

If you have an older version of EdGCM (version 3.1.1 and below), you may continue to use the software free of charge. Please be aware though that as Mac and Windows system software continues to evolve, we cannot guarantee that the older versions of EdGCM will continue to perform well, if at all.


HOW TO UPGRADE from earlier builds of EdGCM 3.2

If you have run only the pre-prepared simulations distributed with EdGCM:

1. To save your existing output, move the EdGCM > Output folder to any location outside the EdGCM folder itself.

2. Once you have installed the new EdGCM build, simply move your old Output folder into the new EdGCM folder, taking care to overwrite the (empty) Output folder from the new copy.

3. To make sure that EdGCM recognizes your old Output, launch the software and look at the run list in the Toolbar. If you see blue-filled circles next to the simulations you ran previously, your upgrade has been successful.


If you have created custom simulations with your old demo copy:

4. Follow Step 1 above to save your Output.

5. Next, export your custom simulation setup information from your old demo copy BEFORE installing the new EdGCM copy. You will import this information into your new EdGCM copy once it is installed. For a step-by-step demonstration of the export/import process, please see our video tutorial at: http://edgcm.columbia.edu/support2/multimedia/

6. Once you have imported your custom simulation setup information into the new EdGCM copy, follow steps 2 and 3 above to finish the upgrade process.


HOW TO UPGRADE from older versions of EdGCM (2.4 to 3.1.1):

If you have run any of the following pre-prepared simulations:

Modern_SpecifiedSST
Modern_PredictedSST
Doubled_CO2
Global_Warming_01
Ice_Age_21kya

and would like to save your existing Output, follow Steps 1 through 3 above.

If you have any other simulations you wish to preserve, begin with Step 4 above. ]]> Announcements Linda Sohl http://forums.edgcm.columbia.edu/showthread.php?t=835 Want to know more about Model E? http://forums.edgcm.columbia.edu/showthread.php?t=834&goto=newpost Mon, 07 Sep 2009 12:49:45 GMT If you will be in Hong Kong on 5 Oct, 2009, then you will have a chance to learn the personal opinions of Dr. Gavin Schmidt on GCMs and may have a... If you will be in Hong Kong on 5 Oct, 2009, then you will have a chance to learn the personal opinions of Dr. Gavin Schmidt on GCMs and may have a chance to ask him more about NASS/GISS Model E.

Patrick


City University of Hong Kong




School of Energy and Environment


Guy Carpenter Asia-Pacific Climate Impact Centre




Research Seminar



“What good is climate modelling?”



Dr. Gavin Schmidt
NASA Goddard Institute for Space Studies, USA




Abstract


Climate models form a large part of the public and policy discussion regarding climate change, but what do they consist of and how do we know whether they are any use? I will aim to give a broad overview of their role and the myriad ways in which they are used and tested – including discussion of what they don't do as well as what they do.


Date: 5 October 2009 (Monday)
Time: 11:30a.m.-12:30a.m. (Tea reception: 11:15a.m.)
Venue: B5207 (near lift 9)
Level 5, Blue Zone, Academic Building
City University of Hong Kong
Tat Chee Avenue, Kowloon



Enquiry: gcacic@cityu.edu.hk



~All are Welcome~
]]> Model E Patrick LEE http://forums.edgcm.columbia.edu/showthread.php?t=834 Seasons true? http://forums.edgcm.columbia.edu/showthread.php?t=833&goto=newpost Wed, 12 Aug 2009 14:38:07 GMT When I ask for a seasonal average from Eva, are the seasons true in the sense that they run from solstice to equinox etc? I am comparing to ground... When I ask for a seasonal average from Eva, are the seasons true in the sense that they run from solstice to equinox etc? I am comparing to ground data so I wish to know how to average my ground data seasonal averages. ]]> EVA - The EdGCM Visualization Application mluvalle http://forums.edgcm.columbia.edu/showthread.php?t=833 Sharing? http://forums.edgcm.columbia.edu/showthread.php?t=832&goto=newpost Mon, 03 Aug 2009 19:35:00 GMT I've just started using EdGCM, and am wondering whether I will have to run the same scenarios others undoubtedly have run, or if there is a mechanism in place to share the output files necessary to avoid duplicating the time-consuming process of running a scenario. If so, I'd be happy to share the files from any scenarios I run, of course.
I plan to use EdGCM in the laboratory component of ecology, global change, and possibly introductory biology courses I teach at Western Michigan University. If students are to compare, e.g., warming under several CO2 scenarios, is there any way to accomplish this in an afternoon other than running the scenarios myself ahead of time (and/or using ones others have run and are willing to share)?
thanks very much, Dave Karowe ]]> Miscellaneous dkarowe http://forums.edgcm.columbia.edu/showthread.php?t=832 position of data underlying maps http://forums.edgcm.columbia.edu/showthread.php?t=831&goto=newpost Thu, 30 Jul 2009 03:11:24 GMT On the zonal average maps, the latitude and longitude positions given by the margins. What do they mean, are they "centers" of the 8X10 zone , or upper right values, or something else ]]> EVA - The EdGCM Visualization Application mluvalle http://forums.edgcm.columbia.edu/showthread.php?t=831 custom insolation scheme? http://forums.edgcm.columbia.edu/showthread.php?t=830&goto=newpost Wed, 22 Jul 2009 21:41:17 GMT Hello. Is it possible to give EdGCM a custom insolation scheme? I would like to do an experiment where part of the world experiences the forcing of... Hello. Is it possible to give EdGCM a custom insolation scheme? I would like to do an experiment where part of the world experiences the forcing of a modified obliquity value, and part of the world doesn't. Is there anything in EdGCM that would allow me to do this? ]]> Science and Modeling Questions mperb http://forums.edgcm.columbia.edu/showthread.php?t=830 Stability on long simulations http://forums.edgcm.columbia.edu/showthread.php?t=827&goto=newpost Mon, 22 Jun 2009 19:07:24 GMT How long can I expect EdGCM to give reasonable output I am running simulations with a fixed bolus of greenhouse gas, and need as long a run at... How long can I expect EdGCM to give reasonable output I am running simulations with a fixed bolus of greenhouse gas, and need as long a run at "stable" global temperatures as I can get. So far, just running 1958-2100, can I add 100 years?
500 years? ]]> Science and Modeling Questions mluvalle http://forums.edgcm.columbia.edu/showthread.php?t=827 Extracting map data http://forums.edgcm.columbia.edu/showthread.php?t=826&goto=newpost Mon, 22 Jun 2009 19:03:47 GMT Is it possible to directly address the data underlying the EVA netcdf variable maps using R under a windows operating system? So far I have been... Is it possible to directly address the data underlying the EVA netcdf variable maps using R under a windows operating system? So far I have been unsuccessful. ]]> Science and Modeling Questions mluvalle http://forums.edgcm.columbia.edu/showthread.php?t=826 Time step http://forums.edgcm.columbia.edu/showthread.php?t=825&goto=newpost Sun, 14 Jun 2009 01:45:42 GMT Hello, A pretty mundane question, but what time-step length does EdGCM use? I had a read of Hansen et al. and my best interpretation is 15... Hello,

A pretty mundane question, but what time-step length does EdGCM use? I had a read of Hansen et al. and my best interpretation is 15 minutes, can this be confirmed?

Thanks,

Conrad ]]> Science and Modeling Questions conrad http://forums.edgcm.columbia.edu/showthread.php?t=825