GMIS - MERIS Monthly mean sea surface diffuse attenuation coefficient at 490nm (9km) in m^-1

Water Transparency (Diffuse attenuation coefficient at 490nm, Kd490 in m^-1 at 9km resolution): The diffuse attenuation coefficient Kd490 measures the light penetration in the water column at the blue-green wavelengths (ca. 490 nm). It represents a good indicator of water transparency resulting from the combined action of absorption and backscattering by the water constituents, and the structure of the surrounding light field.水体透明度（490纳米处漫衰减系数（diffuse attenuation coefficient），记为Kd490，单位为m⁻¹，空间分辨率9千米）：Kd490这一漫衰减系数可表征蓝绿波段（约490纳米）下光在水柱（water column）中的穿透能力。其可作为水体透明度的良好表征指标，由水体组分的吸收与后向散射（backscattering）作用以及周边光场（light field）结构共同决定。