Difference between revisions of "HS-6 processing instructions"
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Once finished running process_hs6(pb#), correct bb values from AC-9 a and b values by running sigmacorrect_bb(pb#) in same directory as processing takes place. | Once finished running process_hs6(pb#), correct bb values from AC-9 a and b values by running sigmacorrect_bb(pb#) in same directory as processing takes place. | ||
| + | |||
| + | Sigma correction is an adjustment to improve the accuracy of | ||
| + | backscattering measurements in highly-attenuating water. Some light that would | ||
| + | otherwise be detected as backscattering is lost to attenuation in the water between | ||
| + | the instrument and the detection volume, causing backscattering to be | ||
| + | underestimated. The correction needs attenuation measurements Kbb = a + .4b where b = c-a from AC instrument. | ||
| + | |||
| + | |||
Look at values after processing by running plot_bbp_final(pb###). When opening the file to look at, look in the "final" directory. Files are "ds_##" | Look at values after processing by running plot_bbp_final(pb###). When opening the file to look at, look in the "final" directory. Files are "ds_##" | ||
[[plot_bbp_final]] | [[plot_bbp_final]] | ||
Revision as of 11:56, 9 March 2016
In April 2010 the HS-6 underwent a calibration and wavelength change. 420 442 470 510 589 700 Original wavelengths were 442 470 510 589 671 870
Processing HS6 is generally the same procedure as the AC-9. See AC-9 processing instructions for more detailed information. The "X" cast is not processed for the HS6.
Once finished running process_hs6(pb#), correct bb values from AC-9 a and b values by running sigmacorrect_bb(pb#) in same directory as processing takes place.
Sigma correction is an adjustment to improve the accuracy of backscattering measurements in highly-attenuating water. Some light that would otherwise be detected as backscattering is lost to attenuation in the water between the instrument and the detection volume, causing backscattering to be underestimated. The correction needs attenuation measurements Kbb = a + .4b where b = c-a from AC instrument.
Look at values after processing by running plot_bbp_final(pb###). When opening the file to look at, look in the "final" directory. Files are "ds_##"
