Fate and Transport of Polycyclic Aromatic Hydrocarbons in Upland Irish Headwater Lake Catchments

Figure 2

Upper: wind rose source-receptor plots showing the proportion (%) of air by direction and source (Republic of Ireland (red), Northern Ireland (orange), Great Britain (green) and marine and other regions (blue)) arriving at the study catchments (receptors; arrival height of 850 hPa) based on two-day back trajectories estimated every six hours during the period 1989–2009.