How to implement linear-control object for emissions intensity changes? about gcam-core HOT 3 CLOSED

There are two parts to doing this.

First, you want to delete the existing GDP control object (or not read it in in the first place). Second, add the linear-control object:

Here is an example of doing both of these in one add-on XML file (although these can be done in separate add on XML files as well).

<?xml version="1.0" encoding="UTF-8"?>
<scenario>
   <world>
      <region name="India">
         <supplysector name="trn_freight_road" nocreate="1">
            <subsector name="Truck (5-9t)" nocreate="1">
               <stub-technology name="Liquids" nocreate="1">
                  <period year="1975">
                     <Non-CO2 name="BC">
                        <gdp-control delete="1" name="GDP_control"/>
                        <linear-control name="MFR">
                           <final-emissions-coefficient>7.63E-04</final-emissions-coefficient>
                           <start-year>2015</start-year>
                           <end-year>2030</end-year>
                        </linear-control>
                     </Non-CO2>
                  </period>
               </stub-technology>
            </subsector>
          </supplysector>
      </region>
   </world>
</scenario>

This example linearly ramps the 2015 emission factor for this technology down to a small value in 2030.

This same input can be added to a future period (e.g. ) so that it only takes effect from that vintage onward.

Note that we have identified a bug with the linear-control code in the current release. In some instances adding a linear-control will cause the code to error. We have a fix for this that will be in the next release, if you have problems let us know and we can help out with that.

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Steve, thanks for the guidance. This is exactly what I was looking for. Will wait to give this a shot until the bug fix is pushed.

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@robbieorvis, this bug is now fixed in GCAM 5.1.3

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