Meteorological and Back Trajectory Modeling for the Rocky Mountain Atmospheric Nitrogen and Sulfur Study II

Table 3

Median values of 𝑅², percent of ammonia attributed to Colorado and percent attributed to Northeast Colorado for all TrMB trials. Total number of trials is 4320, so trials/row is 4320 divided by the number of categories. For example there are four seasons, so trials/season is 4320/4=1080.

Category		𝑅^2	% from Colorado	% from NE Colorado
By season	Winter	0.49	47	5
	Spring	0.40	44	9
	Summer	0.39	52	16
	Fall	0.54	46	17
By start location	Core site	0.45	48	13
	12 km east	0.52	48	17
	12 km west	0.44	48	8
	12 km north	0.47	47	12
	12 km south	0.49	47	11
By maximum trajectory length	3 days	0.42	52	12
	5 days	0.45	45	12
	7 days	0.44	44	12
By maximum endpoint height allowed	1 km	0.41	52	13
	Top of MH	0.43	52	13
	3 km	0.44	44	11
	No limit	0.46	42	11
By input meteorology	WRF	0.41	46	10
	NAM12	0.46	48	14
By concentration timing	Correct time	0.42	48	14
	1 day early	0.40	46	10
	1 day late	0.48	49	11
By R cutoff for collinearity	0.7	0.36	53	11
	0.8	0.44	48	13
	0.9	0.50	43	12