Inherent optical property inversion of ocean color spectra and its biogeochemical interpretation .1. Time series from the Sargasso Sea
Inherent optical property inversion of ocean color spectra and its biogeochemical interpretation .1. Time series from the Sargasso Sea
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DOI：
10.1029/96jc03243
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发表时间：
1997-08-15
影响因子：
3.6
通讯作者：
Siegel, DA
中科院分区：
文献类型：
--
作者：
Garver, SA;Siegel, DA
用于反演海洋色谱的非线性统计方法用于确定三个固有光学特性 (IOP)、浮游植物、溶解和碎屑材料的吸收系数以及颗粒引起的反向散射系数。固有光学性质反演模型假设：（1）遥感反射率与后向散射和吸收之间的关系是众所周知的，（2）纯水的光学系数是已知的，（3）浮游植物和溶解和碎屑物质的特定吸收系数的光谱形状以及颗粒物的特定后向散射系数是已知的。这使得三个未知系数的大小有待确定。进行敏感性分析，以确定使用现有生物光学模型的马尾藻海的最佳 IOP 模型配置。所使用的光学和生物地球化学测量结果是百慕大生物光学项目和美国联合项目的一部分。全球海洋通量研究百慕大大西洋时间序列（BATS）。结果表明，IOP 模型对用于模拟溶解和碎屑材料吸收的指数衰减常数的变化最为敏感。检索到的叶绿素 a 估计值与叶绿素 a 测定值 (r(2) = 81%) 具有良好的对应性，类似于标准带比色素算法的估计值，同时提供两个额外的检索。检索到的有色溶解和碎屑材料吸收估计值的时间信号反映在 K-d(410) 与 K-d(488) 的比率中，K-d(488) 是非藻类光衰减系数的定性指标。颗粒的反向散射系数在时间上几乎恒定，并且与观察到的叶绿素 a 浓度的时间信号没有对应关系。最后，仅使用与海景宽视场传感器波段紧密匹配的波长来评估 IOP 模型。这导致 BATS 生物地球化学数据集的后播技能仅下降 1% 到 6%。这对于将 IOP 模型应用于即将到来的海洋颜色卫星任务数据的长期目标来说是令人鼓舞的。
A nonlinear statistical method for the inversion of ocean color spectra is used to determine three inherent optical properties (IOPs), the absorption coefficients for phytoplankton and dissolved and detrital materials, and the backscattering coefficient due to particulates. The inherent optical property inversion model assumes that (1) the relationship between remote-sensing reflectance and backscattering and absorption is well known, (2) the optical coefficients for pure water are known, and (3) the spectral shapes of the specific absorption coefficients for phytoplankton and dissolved and detrital materials and the specific backscattering coefficient for particulates are known. This leaves the magnitudes for the three unknown coefficients to be determined. A sensitivity analysis is conducted to determine the best IOP model configuration for the Sargasso Sea using existing bio-optical models. The optical and biogeochemical measurements used were collected as part of the Bermuda Bio-Optics Project and the U.S. Joint. Global Ocean Flux Study Bermuda Atlantic Time Series (BATS). The results demonstrate that the IOP model is most sensitive to changes in the exponential decay constant used to model absorption by dissolved and detrital materials. The retrieved chlorophyll a estimates show excellent correspondence to chlorophyll a determinations (r(2) = 81%), similar to estimates from standard band ratio pigment algorithms, while providing two additional retrievals simultaneously. The temporal signal of retrieved estimates of absorption by colored dissolved and detrital materials is mirrored in ratios of K-d(410) to K-d(488), a qualitative indicator for nonalgal light attenuation coefficients. The backscatter coefficient for particles is nearly constant in time and shows no correspondence with the temporal signal observed for chlorophyll a concentrations. Last, the IOP model is evaluated using only those wavelengths which closely match the Sea Viewing Wide Field of View Sensor wave bands. This results in only a 1 to 6% decrease in hindcast skill with the BATS biogeochemical data set. This is encouraging for the long-range goal of applying the IOP model to data from upcoming ocean color satellite missions.