Simulation of Threshold UV Exposure Time for Vitamin D Synthesis in South Korea

Table 2

Mean and standard deviation of CMF_obs with respect to the cloud categories from the numerical weather prediction results.

Cloud categories	Cloud amount	CMFobs		CMF
		Seoul	Pohang
No clouds	0∼2	0.812 (±0.177)	0.859 (±0.196)	0.984
Partly cloudy 1	3∼5	0.748 (±0.186)	0.828 (±0.194)	0.918
Partly cloudy 2	6∼7	0.652 (±0.186)	0.765 (±0.225)	0.784
Overcast 1	8∼9	0.501 (±0.191)	0.570 (±0.221)	0.579
Overcast 2	10	0.267 (±0.162)	0.307 (±0.185)	0.450