format

The calibrated TSRB data are presented in ascii format with 17 columns of data:

Column 1: day of year (GMT time; day 1 = Jan 1 1999)
Column 2: decimal time (GMT)
Column 3: Ed(412) (uW cm^-2 nm^-1)
Column 4: Ed(443) (uW cm^-2 nm^-1)
Column 5: Ed(490) (uW cm^-2 nm^-1)
Column 6: Ed(555) (uW cm^-2 nm^-1)
Column 7: Ed(670) (uW cm^-2 nm^-1)
Column 8: Ed(684) (uW cm^-2 nm^-1)
Column 9: Ed(700) (uW cm^-2 nm^-1)
Column 10: Lu(412) (uW cm^-2 nm^-1 sr^-1)
Column 11: Lu(443) (uW cm^-2 nm^-1 sr^-1)
Column 12: Lu(490) (uW cm^-2 nm^-1 sr^-1)
Column 13: Lu(555) (uW cm^-2 nm^-1 sr^-1)
Column 14: Lu(670) (uW cm^-2 nm^-1 sr^-1)
Column 15: Lu(684) (uW cm^-2 nm^-1 sr^-1)
Column 16: Lu(700) (uW cm^-2 nm^-1 sr^-1)
Column 17: sea surface temperature (^oC)

GMT is 7 hours ahead of local time (PST).

calibration

This instrument was calibrated by Satlantic, Inc., before use. The calibration file (ts2004c.cal) has the following format:

Rows 1-13: header lines
Rows 14-28: irradiance calibration values
Rows 29-35: header lines
Rows 36-49: radiance calibration values
Rows 50-57: header lines
Rows 58-61: temperature calibration values
Rows 62-67: header lines

An example set of irradiance calibration values from this file is shown below:

ES 411.8 'uW/cm^2/nm' 2 BU 1 OPTIC2
32769.0 9.4680e-003 1.00

The first number, 411.8, is the center wavelength of that channel. The appropriate units for the calibrated channel are shown in quotes (uW/cm^2/nm). The calibrated dark value (counts) is the first number on the second line (32769.0). The next number (9.4680e-003) is the calibration factor (F) to convert units of counts to irradiance (uW/cm²/nm). The final number (1.00) is the immersion correction (Im). There are seven pairs of lines in this format, one for each channel. The appropriate equation for converting raw (count) irradiance values to irradiance values in units of uW/cm²/nm is:

Ed(calibrated) = [Ed(counts)-dark(counts)] * F * Im.

A similar equation yields the calibrated radiance values.

The temperature calibration values consist of a list of seven numbers (t₀ ...t₆). The temperature (in degrees C) is calculated as:

T(calibrated) = t₀ + t₁*T(counts) + t₂*T(counts)² + ... + t₆*T(counts)⁶.

Note that the data presented here have already been calibrated and do not need to have these corrections applied. The calibration files are included here for completeness.

Webpage by Jasmine S. Bartlett, Oregon State University.