User`s manual

Appendix IV: Derived Parameter Formulas
104
Descent rate and acceleration are computed by calculating the derivative of
the pressure signal with respect to time (with a user-input window size for
calculating the derivative), using a linear regression to determine the slope.
Values computed by SEASAVE and SBE Data Processing’s Data Conversion
module are somewhat different from values computed by SBE Data
Processing’s Derive module. SEASAVE and Data Conversion compute the
derivative with a window looking backward in time, since they share common
code and SEASAVE cannot use future values of pressure while acquiring data
in real time. Derive uses a centered window (equal number of points before
and after the scan) to obtain a better estimate of the derivative. Use SEASAVE
and Data Conversion to obtain a quick look at descent rate and acceleration;
use Derive to obtain the most accurate values.
(Note: Enter the window size (seconds) for calculation of descent rate and
acceleration on the Miscellaneous tab in Configure Inputs.)
oxygen [ml/l] = (As applicable, see Application Note 64: SBE 43 Dissolved
Oxygen Sensor or Application Note 13-1: SBE 13, 23, 30 Dissolved Oxygen
Sensor Calibration & Deployment)
(Oxygen values computed by SEASAVE and SBE Data Processing’s Data
Conversion module are somewhat different from values computed by SBE
Data Processing’s Derive module. Both Algorithms compute the derivative of
the oxygen signal with respect to time (with a user-input window size for
calculating the derivative), using a linear regression to determine the slope.
SEASAVE and Data Conversion use a window looking backward in time,
since they share common code and SEASAVE cannot use future values of
oxygen while acquiring data in real time. Derive uses a centered window
(equal number of points before and after the scan) to obtain a better estimate of
the derivative. Use SEASAVE and Data Conversion to obtain a quick look at
oxygen values; use Derive to obtain the most accurate values.)
(Note: Enter the window size (seconds) for calculation of oxygen on the
Miscellaneous tab in Configure Inputs.)
oxygen [
μ moles/kg] = oxygen [ml/l]
Corrected Irradiance [CPAR] =
100 * ratio multiplier * underwater PAR / surface PAR [%]
(Ratio multiplier = scaling factor used for comparing light fields of disparate
intensity, input in .con file entry for surface PAR sensor;
Underwater PAR = underwater PAR data;
Surface PAR = surface PAR data)
Sigma-theta + 1000
44660
Note:
For complete description of ratio
multiplier, see Application Note
11S (SBE 11plus Deck Unit) or
47 (SBE 33 or 36 Deck Unit).