Database 2 - Field Description (Spectral Irradiance at Specific Wavelengths)

For more information on data format see CHAPTER 6 of the Operations Report class="odd"
Column Fieldname Unit Description
1 DataScan - Filename of spectral scan. Filename is of the form SFYYHHMM.DDD, with
  • S = site code (A = McMurdo Station; B = Palmer Station; C = South Pole)
  • F = Scan type (D stands for the data scan)
  • YY = Year
  • HH = Hour at start of scan
  • MM = Minute at start of scan
  • DDD = Julian Day
2 Volume - Volume of published data
3 TimeB - Date and Time at start of item 2 of a solar spectral irradiance scan. Date and time refer to Greenwich Mean Time 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).

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.

4 Site - Site identifier: 1 = McMurdo Station; 2 = Palmer Station; 3 = South Pole Station;
5 Abnormal - Information about scan quality
6 ZenithB degrees Solar zenith angle at start of item 2 of a solar spectral irradiance scan
7 AzimuthB degrees Solar azimuth angle at start of item 2 of a solar spectral irradiance scan
8 E285_A µW/(cm² nm) Spectral Irradiance at 285 nm from Item 1
9 E285_C µW/(cm² nm) Spectral Irradiance at 285 nm from Item 4
10 E290 µW/(cm² nm) Spectral Irradiance at 290 nm
11 E295 µW/(cm² nm) Spectral Irradiance at 295 nm
12 E297 µW/(cm² nm) Spectral Irradiance at 297 nm
13 E298 µW/(cm² nm) Spectral Irradiance at 298 nm
14 E299 µW/(cm² nm) Spectral Irradiance at 299 nm
15 E300 µW/(cm² nm) Spectral Irradiance at 300 nm
16 E302_5 µW/(cm² nm) Spectral Irradiance at 302_5 nm
17 E305 µW/(cm² nm) Spectral Irradiance at 305 nm
18 E306_5 µW/(cm² nm) Spectral Irradiance at 306.5 nm
19 E307_5 µW/(cm² nm) Spectral Irradiance at 285 nm
20 E308_26 µW/(cm² nm) Spectral Irradiance at 307.5 nm
21 E310_1 µW/(cm² nm) Spectral Irradiance at 310_1 nm
22 E313 µW/(cm² nm) Spectral Irradiance at 313 nm
23 E313_5 µW/(cm² nm) Spectral Irradiance at313.5 nm
24 E316_8 µW/(cm² nm) Spectral Irradiance at 316.8 nm
25 E320 µW/(cm² nm) Spectral Irradiance at 320 nm
26 E325 µW/(cm² nm) Spectral Irradiance at 325 nm
27 E332_01 µW/(cm² nm) Spectral Irradiance at 332.01 nm
28 E337_28 µW/(cm² nm) Spectral Irradiance at 337.28 nm
29 E340 µW/(cm² nm) Spectral Irradiance at 340 nm
30 E349 µW/(cm² nm) Spectral Irradiance at 349 nm
31 E350 µW/(cm² nm) Spectral Irradiance at 350 nm
32 E380 µW/(cm² nm) Spectral Irradiance at 380 nm
33 E400 µW/(cm² nm) Spectral Irradiance at 400 nm
34 E500 µW/(cm² nm) Spectral Irradiance at 500 nm
35 E600 µW/(cm² nm) Spectral Irradiance at 600 nm
36 TSI_A - Average TSI measurements during Item 1 of spectral scan.
37 TSI_B - Average TSI measurements during Item 2 of spectral scan.
38 TSI_C - Average TSI measurements during Item 3 of spectral scan./font>
39 PSP_B mW/cm² Short-wave (0.3 - 3 µm) solar irradiance meausured with an Eppley Laboratory Precision Spectral Pyranometer (PSP). Value is average value of measurements performed during Item 2 of the spectral scan.
40 TUVR_B mW/cm² Broadband solar UV irradiance (spectral range 295 - 385 nm) meausured with an Eppley Laboratory TUVR instrument. Value is average value of measurements performed during Item 2 of the spectral scan.

Remarks:
  • TSI stands for "Total Scene Irradiance" sensor. The sensor consists of a filtered photodiode that is an integral part of the system. Values published in Database 2 are average TSI measurements performed during several items of the spectral scan. Thus, TSI measurements give an indication of the change of solar irradiance during a spectral scan, for example due to clouds. For more information, see Section 2.1.2 of our latest Operations Report.