These forcing graphs enable the user to view on-screen the calculated radiative forcing in Wm-2, either gas-by-gas or as a scenario total. The period shown here is always from 1990 to 2100 and the forcings are always shown with respect to 1990.
Two buttons - All on and All off - allow the user to display all or none of the forcing curves. If you wish to display only selected curves then click on the relevant buttons in the panel in the top left of the screen. You can select curves by gas, by emissions scenario (r = reference; p = policy) or by parameter selection (d = default; u = user model). For example, to show the total radiative forcing of the two emissions scenarios and the two choices of model, then click the four buttons at the bottom of the panel marked Total. The four colours relate to the emissions scenario/parameter settings selections, while the different symbols on the curves relate to the radiative forcing contributions of the different gases. Note that SO2 forcing is shown as a global-average, and not by region.
Note that in the gas selection panel TropO3 (= tropospheric ozone) appears even though this gas is not specified directly in the MAGICC emissions scenarios. This forcing is determined in MAGICC by the emissions of the reactive gases and methane. Halos (total halocarbon forcing) is in part controlled by input emissions that are specified by the user (for 8 species that fall under the Kyoto Protocol), and in part by emissions that are now controlled by the Montreal Protocol and various amendments to it (these emissions cannot be specified by the user).
If you wish to produce a hard copy plot of any graph the Print button will generate a print of your screen directly on an attached printer. Note that this direct print option will not work with all printers. The EPS file button (used to produce an encapsulated postscript (EPS) file in earlier versions of MAGICC/SCENGEN) is not working in the current version.
A further alternative is to use the Windows Alt-Prnt Scrn facility to port the graphics window to a Word document.
When you have finished viewing these graphs select OK to return to
the main menu.