Water-leaving albedo (α_w), defined as the ratio of water-leaving irradiance to downwelling irradiance just above the surface, is a major component of ocean surface albedo (α) but has long been ignored or underrepresented. A semi-analytical scheme based on inherent optical properties (IOPs), termed IOPs-α_w, is proposed in this study to estimate spectral α_w(λ) from ocean color measurements. Evaluations with numerical simulations of radiative transfer show that IOPs-α_w outperforms the conventional scheme based on chlorophyll-a (Chl) concentration. The median absolute percentage difference (MAPD) of derived α_w(λ) from IOPs-α_w is generally less than 3% in the blue-green spectral domain, in comparison to MAPD of over 40% for estimated α_w(λ) from the Chl-based scheme. IOPs-α_w is later implemented to monthly composite data of the Visible Infrared Imaging Radiometer Suite (VIIRS), where reasonable spatial distributions and seasonal patterns of α_w(λ) are obtained. In particular, broadband α_w in the visible domain, termed α_{w_VIS}, obtained via IOPs-α_w is over 50% higher than the previous estimation by the Chl-based scheme in most oceanic waters. Furthermore, this study concludes that α_{w_VIS} could contribute up to 20% to α in oceanic waters under low solar-zenith angles. Thus, we suggest that neither the spatial variability of α_{w_VIS} nor the contribution of α_{w_VIS} to α shall be neglected, and it is necessary to incorporate IOPs-α_w into current parameterizations of α in coupled ocean-atmosphere and climate models.

水离开的反照率（α_瓦特），被定义为离水辐照的比例只是表面上方辐照度下降流，是海洋表面的反照率（的主要组分α），但一直被忽略或代表性不足。本研究提出了一种基于固有光学特性 (IOP) 的半解析方案，称为 IOPs- α _w，用于估计海洋颜色测量的光谱α _w ( λ )。辐射传输数值模拟的评估表明，IOPs- α _w优于基于叶绿素-a (Chl) 浓度的传统方案。派生α _w的中值绝对百分比差 (MAPD)来自 IOPs- α _{w 的}( λ )在蓝绿色光谱域中通常小于 3%，相比之下，来自基于 Chl 的方案的估计α _w ( λ ) 的MAPD 超过 40% 。IOPs- α _w后来被应用于可见红外成像辐射计套件 (VIIRS) 的月度合成数据，其中获得了α _w ( λ ) 的合理空间分布和季节性模式。特别是，可见域中的宽带α _w，称为α _{w_VIS}，通过 IOPs- α _w获得在大多数海洋水域中，比之前基于 Chl 的方案的估计值高出 50% 以上。此外，这项研究的结论是，α _{w_VIS}可以贡献高达20％〜α下低太阳高度角的海洋水域。因此，我们建议无论是α _{w_VIS}的空间变异性还是α _{w_VIS}对α的贡献_都不应被忽略，并且有必要将 IOPs- α _w纳入当前海洋-大气和气候耦合模型中的α参数化。