<p>Research has shown considerable variability in whitecap coverage (<i>W</i>) under low to moderate wind conditions. During an expedition to the Northwestern Pacific, oceanographic variables and photographic measurements were collected to investigate the influence of wave-induced stress on <i>W</i> within these wind ranges. The friction velocity was recalculated based on turbulent stress, and wind profiles were modified to account for wave-induced stress and swell presence on the sea surface. The study examined <i>W</i>’s relationship with multiple parameters, including friction velocity (<i>u</i>_*), breaking wave Reynolds numbers, wavesea Reynolds numbers, and wave age. The analysis utilized both conventional <i>u</i>_* and turbulent stress-based friction velocity (<i>u</i>_*turb). When utilizing <i>u</i>_*turb rather than <i>u</i>_*, the estimation model’s fitting results revealed an increase in correlation coefficient (<i>R</i>²) from 0.51 to 0.62, and a decrease in root mean square error (RMSE) from 0.0652 to 0.0574. Additionally, when parameterizing <i>W</i> using the windsea Reynolds number, with <i>u</i>_*turb replacing <i>u</i>_* and wind wave height substituting mixed wave height, the <i>R</i>² increased from 0.38 to 0.53, and the RMSE decreased from 0.0737 to 0.0668. The results demonstrate that calculating <i>u</i>_* using the turbulent stress-based method, along with wind wave height and peak wave speed of mixed waves, yields stronger correlation with <i>W</i>. This correlation improvement stems from the inhibition of wave breaking by swell and wave-induced stress. The integration of turbulent stress and wind wave field measurements enhances the understanding of relationships between <i>W</i> and various parameters. However, swell effects on wind profiles do not substantially affect <i>W</i> estimation using wind speed-related parameters.</p>