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Hyperspectral temperature and salt dependencies of absorption by water and heavy water in the 400-750 nm spectral range

机译：在400-750 nm光谱范围内水和重水吸收的高光谱温度和盐依赖性

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The temperature and salt dependencies of absorption by liquid water (H2O) and heavy water (D2O) were determined using a hyperspectral absorption and attenuation meter (WET Labs, AC-S). Sodium chloride (NaCl) was used as a proxy for seawater salts. There was no significant temperature (Psi(T)) or salt (Psi(S)) dependency of absorption at wavelengths < 550 nm. At wavelengths > 550 nm, Psi(T) exhibited peaks at similar to 604, 662, and 740 nm. A small negative trough in Psi(S) occurred at similar to 590 nm, followed by a small positive peak similar to 620 nm, a larger negative trough at similar to 720 nm, and a strong positive peak at similar to 755 nm. The salt dependency of absorption by heavy water, Psi(H)(8), exhibited a negative power-law shape with very low Psi(H)(8), at wavelengths > 550 nm. Our experiments with NaCl, clean open ocean seawater, and artificial seawater support the hypothesis that salts modify the absorption spectra of seawater by modifying the molecular matrix and vibrations of pure water. (c) 2006 Optical Society of America.
机译：使用高光谱吸收和衰减仪（WET Labs，AC-S）确定液态水（H2O）和重水（D2O）吸收的温度和盐依赖性。氯化钠（NaCl）用作海水盐的替代物。在小于550 nm的波长处，吸收没有明显的温度（Psi（T））或盐（Psi（S））依赖性。在波长大于550 nm时，Psi（T）在604、662和740 nm处出现峰值。 Psi（S）中出现一个小的负谷，接近590 nm，随后出现一个小的正峰，类似于620 nm，一个更大的负谷，类似于720 nm，一个强的正峰，类似于755 nm。重水吸收的盐依赖性Psi（H）（8）在波长大于550 nm时显示出负的幂律形状，且Psi（H）（8）非常低。我们在NaCl，洁净的开放海水和人造海水中进行的实验支持以下假设：盐通过修饰分子矩阵和纯净水的振动来改变海水的吸收光谱。 （c）2006年美国眼镜学会。

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