Table 4 Distribution of XCO₂ anthropogenic enhancement (XCO₂_FF) accumulated over a 24-hour period from the CHE global nature run as mean number (and percentage in bold) of model cells with XCO₂_FF > 0.25 ppm (left columns) and XCO₂_FF > 0.50ppm (right columns).

	XCO₂_FF > 0.25 ppm Number model cells % model cells (Number clear-sky model cells) (% clear-sky model cells)			XCO₂_FF > 0.50 ppm Number model cells % model cells (Number clear-sky model cells) (% clear-sky model cells)
	Land	Coast	Ocean	Land	Coast	Ocean
January	36,533 + /−2,458	41,018 + /−1924	15,689 + /−3,031	14,933 + /−1,312	18,178 + /−1,243	5,444 + /−1475
	0.55 + /−0.04	0.62 + /−0.03	0.24 + /−0.05	0.23 + /−0.02	0.28 + /−0.02	0.08 + /−0.02
	(11,194 + /−2,468)	(10,809 + /−3,101)	(3745 + /−1,466)	(4,995 + /−1,599)	(5,096 + /−1,915)	(1,471 + /−853)
	(0.17 + /−0.04)	(0.16 + /−0.05)	(0.06 + /−0.02)	(0.08 + /−0.02)	(0.08 + /−0.03)	(0.02 + /−0.01)
July	24,352 + /−1,235	28,203 + /−867	9,107 + /−2212	8,603 + /−583	11,325 + /−610	2,901 + /−954
	0.37 + /−0.02	0.43 + /−0.01	0.14 + /−0.03	0.13 + /−0.01	0.17 + /−0.01	0.04 + /−0.01
	(6,314 + /−1,288)	(5,746 + /−1,556)	(2,181 + /−1169)	(2,238 + /−613)	(2,289 + /−768)	(732 + /−554)
	(0.10 + /−0.02)	(0.09 + /−0.02)	(0.03 + /−0.02)	(0.03 + /−0.01)	(0.03 + /−0.01)	(0.01 + /−0.01)

The variability with respect to the mean number is shown by the +/− standard deviation. The statistics are also provided for clear-sky conditions, land, ocean and coastal regions, as these considerations are all relevant for satellite observations. Clear-sky model cells are defined with a cloud fraction threshold less than 10% over the 9 km × 9 km model cell; land cells have more than 99% land; ocean cells have less than 1% land and model cells over the coast have land between 1 and 99%.

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