The synthetic scenario generator enables users to make incremental adjustments to temperature and precipitation (in %). These adjustments are applied uniformly to the baseline climate data. This is a valuable tool for rapid sensitivity analysis, and can be used to examine effects of historical anomalies (e.g. past drought events).

For example, on some occasions you may wish to simply create an image based on a known value such as a reduction in rainfall of 10 percent or an increase in maximum temperature of 2 degrees C. With SimCLIM 4.x for Desktop this can easily be achieved by choosing the synthetic option in the Select scenario generation parameters dialogue box as displayed below.

To do this define the study area in the top right hand corner and then on the scenario icon .

Choose the Synthetic tab. The difference with a synthetic analysis is that you do not choose a Year, GCM or RCP pattern. Depending on your type of analysis enter the degree C change or percent change in precipitation. These numbers can be either minus (-3.00) or can positive (3.00), for example.

Activity: precipitation and temperature for baseline conditions (the year is irrelevant in this type of analysis) and compare the images using the link images function.

1] Choose a study area (perhaps one you have not used before).

2] Conduct an analysis for precipitation (say one -10% and a second -20 %).

3] Tile the images.

4] Link the images and compare (do the same with temperature with different choices 2 and perhaps 3 degrees C.)

Sample synthetic scenarios for Thailand (-10% (left window) and 10% right window)