Information on Vitamin D Synthesis / Erythemal UV | Center for Global Environmental Studies

Exposure Time for Vitamin D Synthesis / MED (Climatology):Osaka

Exposure Time around Noon (min.)

	January			February			March
	early	middle	late	early	middle	late	early	middle	late
MED	150	130	130	110	100	80	70	50	50
600 cm²	70	60	60	50	40	30	30	20	20
1200 cm²	35	30	30	25	20	15	15	10	10

	April			May			June
	early	middle	late	early	middle	late	early	middle	late
MED	40	40	40	35	40	32	30	40	30
600 cm²	15	15	13	12	13	12	10	13	11
1200 cm²	8	8	7	6	7	6	6	7	6

	July			August			September
	early	middle	late	early	middle	late	early	middle	late
MED	35	32	30	25	35	32	35	40	50
600 cm²	12	11	10	9	12	12	13	15	18
1200 cm²	6	6	5	5	6	6	6	7	8

	October			November			December
	early	middle	late	early	middle	late	early	middle	late
MED	50	50	70	70	90	100	120	130	130
600 cm²	20	20	25	30	40	50	50	55	60
1200 cm²	10	10	12	15	20	23	25	30	30

The numerical values in the row of 'MED', '600 cm²' and '1200 cm²' show the mean time to reach MED (Minimal Erythema Dose), the time required for 10 µg Vitamin D to be produced for a skin area of 600 cm², and 1200 cm² exposed to solar radiation in minutes, respectively.
By clicking each 10 day period, you can also see a diurnal variation of exposure time for that period.
In case no data are available, '--' is put in the matrix.

Appropriate exposure time at every site shown below can be seen.
Cape Ochi-ishi (Hokkaido), Rikubetsu (Hokkaido), Sapporo (Hokkaido), Aomori (Aomori), Sendai (Miyagi), Tsukuba (Ibaraki), Yokohama (Kanagawa), Nagoya (Aichi), Otsu (Shiga), Osaka (Osaka), Miyazaki (Miyazaki), Cape Hedo (Okinawa), Hateruma (Okinawa).

Exposure Time for Vitamin D Synthesis / MED (Climatology):Osaka

Position of Osaka