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

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

Exposure Time around Noon (min.)

	January			February			March
	early	middle	late	early	middle	late	early	middle	late
MED	150	120	120	100	80	70	50	60	50
600 cm²	70	65	55	40	30	25	20	20	15
1200 cm²	35	32	30	20	15	12	9	10	8

	April			May			June
	early	middle	late	early	middle	late	early	middle	late
MED	40	35	30	30	30	30	30	30	30
600 cm²	15	12	10	10	10	10	10	10	10
1200 cm²	7	6	5	5	5	5	5	5	5

	July			August			September
	early	middle	late	early	middle	late	early	middle	late
MED	30	30	25	25	25	30	40	30	40
600 cm²	10	10	8	8	9	10	15	10	12
1200 cm²	5	5	4	4	5	5	8	5	6

	October			November			December
	early	middle	late	early	middle	late	early	middle	late
MED	60	55	60	75	90	100	150	150	150
600 cm²	20	20	20	30	40	50	70	70	70
1200 cm²	10	10	10	15	20	25	35	35	35

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):Sendai

Position of sendai