NSF UV Monitoring Network: File description of daily doses File Description of "Daily Dose" Databases

Units of daily doses are kJ / m 2

Column Name Description
1 Date Date and time assigned to the daily dose values. Date and time refer to Greenwich Mean Time (GMT) and are encoded into a single number where the integer part is the day number relative to January 1, 1900 (day 1 corresponds to 1/1/1900). The fractional part is the time of day. (For example, the fractional part multiplied with 24 gives the hour of the measurement). Time refers to approximate local solar noon (01:00z for McMurdo Station; 16:00z for Palmer Station; 12:00z for South Pole Station; 17:00z for Ushuaia; 20:00z for San Diego, and 21:00z for Barrow). Integration boundaries for daily dose calculations are the given time +/- 12 hours. For example: The daily dose for McMurdo assigned to the Date/Time stamp 36826.04167 (i.e. 10/27/00 01:00 GMT) is the integral of spectral irradiance between 10/26/00 13:00 GMT and 10/27/00 13:00 GMT.

Note: When the file is decoded by Microsoft Excel, the date value will automatically be translated into a correct date/time string, if the box "1904 date system" of the "Tools -> Options -> Calculation"-menu is unchecked.

2 Site Site identifier: 1 = McMurdo Station; 2 = Palmer Station; 3 = South Pole Station; 4 = Ushuaia; 5 = San Diego; 6 = Barrow
3 Volume Volume of data. Published data that has undergone full quality control is labeled by a single digit. The volume label of recent data, which has to be regarded as preliminary, includes the words "alpha" or "beta."
4 Minimum_Zenith Minimum solar zenith angle occurring during solar scans of the integration period.
5 Maximum_Time_Gap Maximum time gap in solar measurements during the integration period between sunrise and sunset in seconds. If the time-gap is larger than 15000 seconds, no doses are published. Gaps smaller than this limit are filled by spline interpolation. A description of the procedure can be found in Section 4.2.4 of Chapter 4, Volume 9 Operations Report. If the gap is larger than 7200 seconds (i.e. two hour) the data has to be treated with caution because the interpolated values may deviate significantly from the actual radiation levels.
6 E290to315 Daily dose for the spectral integral 290 - 315 nm
7 E290to320 Daily dose for the spectral integral 290 - 320 nm
8 E320to360 Daily dose for the spectral integral 320 - 360 nm
9 E360to400 Daily dose for the spectral integral 360 - 400 nm
10 E400to600 Daily dose for the spectral integral 400 - 600 nm
11 E289_855to294_118 Daily dose for the spectral integral 289.855 - 294.118 nm. Data is affected by noise and should not be used uncritically.
12 E294_118to298_507 Daily dose for the spectral integral 294.118 - 298.507 nm
13 E298_507to303_03 Daily dose for the spectral integral 298.507 - 303.03 nm
14 E303_03to307_692 Daily dose for the spectral integral 303.03 - 307.692 nm
15 E307_692to312_5 Daily dose for the spectral integral 307.692 - 312.5 nm
16 E312_5to317_5 Daily dose for the spectral integral 312.5 - 317.5 nm
17 E317_5to322_5 Daily dose for the spectral integral 317.5 - 322.5 nm
18 E322_5to327_5 Daily dose for the spectral integral 322.5 - 327.5 nm
19 E327_5to332_5 Daily dose for the spectral integral 327.5 - 332.5 nm
20 E332_5to337_5 Daily dose for the spectral integral 332.5 - 337.5 nm
21 E337_5to342_5 Daily dose for the spectral integral 337.5 - 342.5 nm
22 E342_5to347_5 Daily dose for the spectral integral 342.5 - 347 .5 nm
23 Dose1 Daily dose calculated from irradiance spectra that were weighted with the action spectrum for erythema defined by Komhyr, W.D., and L. Machta, "The Perturbed Troposphere of 1990 and 2020, 28 Feb - 3 March 1973", Vol. IV, CIAP, Dept. of Transportation, Wash. DC., 1973.
24 Dose2 Daily dose calculated from irradiance spectra that were weighted with the action spectrum for erythema defined by Diffey, B.L., "A comparison of dosimeters used for solar ultraviolet radiometry," Photochemistry and Photobiology, 46, 55-60, 1987.
25 Dose3_CIE_Erythema Daily dose calculated from irradiance spectra that were weighted with the action spectrum for erythema defined by McKinlay, A.F., and B.L. Diffey, CIE Research Note, 6, No.1, 1987).
26 Setlow Daily dose calculated from irradiance spectra that were weighted with the action spectrum quantifying the potential of UV irradiance to cause damage to DNA as suggested by R. B. Setlow in "The wavelengths in sunlight effective in producing skin cancer: a theoretical analysis", Proc. Nat. Acad. Sci., USA, 71 , No. 9, pp. 3363-3366, 1974.
27 Hunter Daily dose calculated from irradiance spectra that were weighted with the "Hunter"-action spectrum (Hunter, J.H., J.H. Taylor, and H.G. Moser, "The effect of ultraviolet irradiation on eggs and larvae of the northern anchovy, Engraulis mordax, and the pacific mackerel, Scomber japonicus, during the embryonic stage", Photochemistry and Photobiology, 29, 325-338, 1979).
28 Caldwell Daily dose calculated from irradiance spectra that were weighted with the "Caldwell"-action spectrum (Caldwell, M. M., "Solar UV irradiation and the growth and development of higher plants," Photophysiology, 6, 131-177, 1971.)
Please see Section 4.2.3 of our latest Network Operations report for details on the parametrization of action spectra.