Figure 5: (a) The surface annual PAN difference between present and preindustrial day (b) The percent change of surface annual PAN from preindustrial to present day for PAN, (c) The zonal annual PAN difference between present and preindustrial day (d) The percent change of zonal annual PAN from preindustrial to present day for PAN
[Note: Percentage change = ((Base-B1800)*100)/B1800].