Fig. 8

Sampling location for the measurements used in this study and main CO₂ sources. The blue dots represent the geographical distribution of the CONTRAIL data. The location of the stations of Kisai (13 m.a.s.l.) and Mt. Dodaira (840 m.a.s.l.), the Narita airport (43 m.a.s.l.) base for CONTRAIL flights (observations from ~ 500 m.a.s.l to 2000 m.a.s.l and the Tsukuba tower (base at 33 m.a.s.l., inlets at 25, 100, and 200 m above ground level) are represented by the black, green, blue and red dots respectively. The red squares represent the location of the major power plants