obtained from the sum of the Datawell DW and difference error D 
(temperature-corrected, if necessary) by 
F(T) = (A2) 
1 
1 + (DW + D) 
which can be applied by multiplying the uncorrected amplitude by F(T) for 
Tp . For correction of parameters related to the square of the amplitude 
(i.e. total energy or variance spectrum coefficients) the following should be 
used: 
2 
2 1 
mt? = ee 2) 
8. To apply the correction, first the difference error between the 
Datawell-predicted error and the error measured during calibration are deter- 
mined. This difference error is then adjusted for the temperature-dependent 
increase in electrical conductivity before the Datawell-predicted difference 
error and the corrected difference error are summed. Finally, the decrease in 
sensitivity (based on the wave period) is computed by adding 1 to the sum. 
9. To demonstrate the use of the calibration results, the Waverider 
buoy (620) located 3 km from shore recorded an Hn of 4.3 m and Ty of 
11 sec on 24 October 1982. Table A3 calibration results for 1 December 1982 
(buoy 66967) give a difference error d for 11 sec of -0.0640. From Part V 
of the main text, Water Characteristics, the water temperature is estimated to 
be 15° C. Entering Table A5 with the difference error -0.06 and water temper- 
ature of 15° C, the correction is 0.0175. This is added to the uncorrected 
difference error d to obtain the corrected difference error D, i.e., 
-0.0465 = -0.0640 + 0.0175 . The corrected difference error (D = -0.0465) is 
added to the Datawell-predicted difference error (DW = -0.0097) in Table A3 
for Ty = 11 sec, -0.0562 = -0.0465 + (-0.0097); and the sensitivity is com- 
puted by adding 1, or 0.9438 = 1 + (-0.0562) 
10. This sensitivity is used to correct amplitudes and variance spectra 
coefficients for 11-sec period. As indicated below, the corrected amplitude 
= the uncorrected amplitude divided by the sensitivity, or 
nes) fy 
0.9438 ~ 
4.6 m (6% increase) 
A8 
