研究了水下高光谱衰减测量仪（ACS）的不确定度。通过不同粒径的标准颗粒（2，5，10，20 μm）的米氏散射理论计算值与紫外-可见分光光度计（PE35）的实测值对比，得出：PE35的衰减测量误差最大不超过8%。针对我国高浑浊水体环境，利用ACS与PE35对我国东海浑浊海水样品进行衰减同步测量，结果表明：ACS在浑浊水体下的测量结果被低估，其不确定度与波长呈负相关；水体的浊度对ACS 衰减测量的不确定度影响较大，且呈正相关，在低浊度水体下ACS(10 cm)的测量值被低估17.2%~19.04%，ACS(25 cm)的测量值被低估7.84%~15.36%，在高浊度水体下ACS(10 cm)的低估则增至26.4%~28.24%。

The uncertainty for the underwater hyperspectral measurement of attenuation (ACS) is studied. The attenuation measurements for standard particles of different diameters (2,5,10,20 mm) by ultra violetvisible (UV-Vis) spectrophotometer (PE35) are compared with model values by Mie scattering theory, and the attenuation measurement error of PE35 is found less than 8% . Subsequently, simultaneous atlenuation measurements by ACS and PE35 are carried out for samples from the high turbid water in the East China Sea. Comparative results show the attenuation measurements by ACS are underestimated in high turbid water, and the uncertainty of ACS measurements has a negative correlation with wavelength, conversely, with a strong positive correlation with turbidity of water. The attenuation measurements of ACS(10 cm) and ACS(25 cm) are underestimated within 17.2% ~19.04% and 7.84% ~15.36% in low turbid water, respectively, while ACS(10 cm) is within 26.4%~28.24% in high turbid water.