Uncertainty budgets for liquid waveguide CDOM absorption measurements.
Uncertainty budgets for liquid waveguide CDOM absorption measurements.
复制标题
液体波导 CDOM 吸收测量的不确定性预算。
作者：
Ina Lefering;R. Röttgers;Christian Utschig;D. McKee
与使用 10 cm 比色皿的高端分光光度计相比，使用简单光谱仪来确定有色溶解有机物 (CDOM) 的光谱吸收的长光程液体波导毛细管池 (LWCC) 系统此前已被证明具有更好的测量灵敏度。然而，有关 LWCC 系统测量不确定性程度的信息仍然很少。对具有三种不同路径长度（50、100 和 250 厘米）的三种不同 LWCC 系统和两种不同包层材料进行交叉比较，可以量化测量精度和准确度，揭示两个参数的强烈波长依赖性。与样品保持静止时进行的测量相比，通过毛细管室稳定泵送样品可提高测量精度。具有较高折射率包层的 50 和 100 cm LWCC 系统的结果显示出系统伪影，包括由于盐度校正性能有限而产生的小但非物理负偏移和高频光谱扰动。相比之下，具有较低折射率包层的新型 250 cm LWCC 返回的小正偏移可能在物理上是正确的。对 700 nm 处的测量进行零值校正后，发现 440 nm 处的 CDOM 吸收数据的总体一致性在 5% 均方根百分比误差范围内。
Long path length liquid waveguide capillary cell (LWCC) systems using simple spectrometers to determine the spectral absorption by colored dissolved organic matter (CDOM) have previously been shown to have better measurement sensitivity compared to high-end spectrophotometers using 10 cm cuvettes. Information on the magnitude of measurement uncertainties for LWCC systems, however, has remained scarce. Cross-comparison of three different LWCC systems with three different path lengths (50, 100, and 250 cm) and two different cladding materials enabled quantification of measurement precision and accuracy, revealing strong wavelength dependency in both parameters. Stable pumping of the sample through the capillary cell was found to improve measurement precision over measurements made with the sample kept stationary. Results from the 50 and 100 cm LWCC systems, with higher refractive index cladding, showed systematic artifacts including small but unphysical negative offsets and high-frequency spectral perturbations due to limited performance of the salinity correction. In comparison, the newer 250 cm LWCC with lower refractive index cladding returned small positive offsets that may be physically correct. After null correction of measurements at 700 nm, overall agreement of CDOM absorption data at 440 nm was found to be within 5% root mean square percentage error.
用于融入利古里亚海生态系统模型的生物光学模型
影响因子：
4.1
作者：
Bengil F
通讯作者：
Bengil F