Fast and accurate irradiance calculations for ecosystem models
Fast and accurate irradiance calculations for ecosystem models
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快速准确地计算生态系统模型的辐照度
DOI：
10.5194/bgd-6-10625-2009
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
B. Cahill
中科院分区：
文献类型：
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作者：
C. Mobley;L. Sundman;W. Bissett;B. Cahill
摘要。耦合的物理-生物-光学海洋生态系统模型通常对其物理和生物成分使用复杂的处理方法，同时过度简化光学成分，从而可能损害生态系统的预测。为了使光学计算达到最近生态系统模型所要求的标准，我们开发了一个计算速度快的数值模型，名为EcoLight，它解决了方向平均辐射传递方程，以获得精确的水中光谱辐照度，用于光合作用和光氧化的计算。为了评估其计算特性，我们将EcoLight纳入了开放海洋案例1水域的理想物理-生物模型，并将简单分析辐照度模型的十年模拟与EcoLight数值计算进行了比较。优化后，EcoLight的运行时间比分析辐照度模型多出不到30%。此外，EcoLight适用于案例2和光学浅水，因为没有分析辐照度模型存在。EcoLight还计算辅助量，如遥感反射率，这对生态系统验证很有用。
Abstract. Coupled physical-biological-optical ocean ecosystem models often use sophisticated treatments of their physical and biological components, while oversimplifying the optical component to the possible detriment of the ecosystem predictions. To bring optical computations up to the standard required by recent ecosystem models, we developed a computationally fast numerical model, named EcoLight, that solves the azimuthally averaged radiative transfer equation to obtain accurate in-water spectral irradiances for use in calculations of photosynthesis and photo-oxidation. To evaluate its computational features, we incorporated EcoLight into an idealized physical-biological model for open-ocean Case 1 waters and compared ten-year simulations for a simple analytical irradiance model vs. EcoLight numerical calculations. After optimization, the EcoLight run times are less than 30% more than for the analytical irradiance model. Moreover, EcoLight is suitable for use in Case 2 and optically shallow waters, for which no analytical irradiance models exist. EcoLight also computes ancillary quantities such as the remote-sensing reflectance, which can be useful for ecosystem validation.