EdGCM User Guide: Setting Up and Running Simulations, Study Guides, Projects, Research of Geography

Download EdGCM User Guide: Setting Up and Running Simulations and more Study Guides, Projects, Research Geography in PDF only on Docsity! EdGCM Instructions Toolbar: Start/Resume & Pause run buttons Lock indicates run setup options cannot be changed List of all runs New run setup Duplicate existing run setup for modification Bottom of the toolbar changes depending on what other windows are open and active (ie: Simulation Setup window or Analyze Output window). Above depicts what is displayed when the Simulation Setup window is open. Note: To lock or unlock a run, open Setup Simulation window (top menu bar → “Window” → “Setup Simulations”). Then go to top menu bar → “Simulation” → “Lock\Unlock”. Simulation Setup: • Highlight any run from run list • Open its Setup Simulation window (top menu bar → “Window” → “Setup Simulations”) • In toolbar, under “Setup Simulation” heading, click “New” button • New Setup window opens • Enter run and project IDs, start & end dates (can also enter comments, label, keywords & name if you like) Input Folder: • Choose input folder time period (in setup window) • For near past, present, & near future runs, use “Modern” • Choose reference year to match start date • Enter number of your choice for random number seed • Leave initial & boundary conditions at default Ocean Model: • “Predict SST” ocean mode lets model predict SSTs throughout the run • “Specify SST” ocean mode uses observed SSTs, should not be used for future or paleoclimate runs • Leave other ocean options at default • Leave collection boxes unchecked • Click “Get Tables” button • Highlight table name & click “View” • Tables available for viewing in Excel and Internet Explorer • “Reg” in table name indicates table depicts averages for major regions of world Analyze Output: Plots • Analyze Output window → “Plots” tab • Select start and end years • Click “Time Series” button • Select variables to plot • Click “Get Plots” • Highlight plot name you wish to view • Click “View” • Excel opens & data may be easily plotted Analyze Output: Maps • Analyze Output window → “Maps” tab • Select start & end years for averaging • Click “Average” • Select time period(s) to map (i.e. annual) • Select variables to map • Click “Get Maps” • Highlight time period in “Viewable Maps” list • Click “View” Panoply Mapping Tool • After clicking “View”, Panoply opens • Highlight map name • Click “Create Plot” • Many map options to choose from • Interpolation will smooth data (under “arrays” tab) • Drop down box to change time period mapped (i.e. ANN, DJF, JAN), if applicable • Note: map will be lost if you close map window without saving- it does not ask if you would like to save when you close the window Analyze Output: Vertical • In Analyze Output window, “Vertical” tab • Procedure is similar to “Maps” tab • Vertical profile also uses Panoply • Zonal averages depicted in profile Known Problems • First calendar year of any run cannot be analyzed • SST cannot be mapped • Map images do not save well (map itself is preserved, but scale bar & captions become jumbled) • In some cases, data for a certain range of years cannot be averaged for analysis • Vertical profile variable check boxes are off by one (you need to check the box that is one above the variable you want) Sample Run Setup Due to time constraints, it is recommended that you do a 2 year run (allow at least 30 min for calculations). Remember, data from the first calendar year of a run cannot be analyzed. It is recommended that you start the run on Dec 1st to cut down on wasted calculation time. • Start: 12/01/2005 End: 12/31/2007 (this allows user to analyze 12/01/2006- 12/31/2007) • Input folder: Modern • Reference Year: 2005 • Predict SST • Choose to generate monthly average data tables (under “diagnostic output” in Setup window) • Solar: 1998 value (or lookup more current value) • GHGs: 2005 values • Choose to enable CO2 trend • Linear (ppm) trend • 2.75 ppm CO2 change per year (~2*current rate) • Trend From: 2006 To: 2007 You may want to use a relatively large change per year in the trend, since the run is only two years long. It may not be realistic, but it will allow you to better see the consequences in your analysis. To Create Anomaly or Difference Maps/Profiles: In the Panoply window, highlight one of the time periods of a variable you would like to include in your difference map, and click the “create plot” button. This will open a window containing its map. Now, highlight the other time period of the variable you would like to include. In the drop down menu next to the “create plot” button, choose the name of the map you just previously created. Then click on the “combine plot” button (previously the “create plot” button). This will create an anomaly or difference map in the same window as the original map. There are options in a drop down box (within map window, under “array(s)” tab) for choosing which array to subtract from the other. You can also change the scale and color scheme so that white represents zero. To do so, check off the “always fit” option under the “scale” tab. Also under the “scale” tab, change the min and max of the scale so that the min = -1*max, if |max| > |min|. If |max| < |min|, use min*-1=max. Do NOT hit the “fit to data” button. You may need to click inside another box in order for the scale values to take effect. Under the “color” tab, choose a color scheme that includes “diff” in its name.