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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Spatial variability of absorption coefficients over a biogeochemical gradient in a large and optically complex shallow lake
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Spatial variability of absorption coefficients over a biogeochemical gradient in a large and optically complex shallow lake

机译：大型且光学复杂的浅湖中生物地球化学梯度上吸收系数的空间变异性

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In order to improve robustness of remote sensing algorithms for lakes, it is vital to understand the variability of inherent optical properties (IOPs) and their mass-specific representations (SIOPs). In this study, absorption coefficients for particulate and dissolved constituents were measured at 38 stations distributed over a biogeochemical gradient in Lake Balaton, Hungary. There was a large range of phytoplankton absorption (a_(ph)(λ)) over blue and red wavelengths (a_(ph)(440)=0.11–4.39 m~(-1), a_(ph_(675)=0.048– 2.52 m~(-1)), while there was less variability in chlorophyll-specific phytoplankton absorption (a*_(ph)(λ)) in the lake (a*_(ph)(440)=0.022±0.0046 m~2 mg~(-1), a*_(ph)(675)=0.010±0.0020 m~2 mg~(-1)) and adjoining wetland system, Kis-Balaton (a*_(ph)(440)=0.017±0.0015 m~2 mg~(-1), a*_(ph)(675)50.0088±0.0017 m~2 mg~(-1)). However, in the UV, a*_(ph)(350) significantly increased with increasing distance from the main inflow (Zala River). This was likely due to variable production of photoprotective pigments (e.g., MAAs) in response to the decreasing gradient of colored dissolved organic matter (CDOM). The slope of CDOM absorption (S_(CDOM)) also increased from west to east due to larger terrestrial CDOM input in the western basins. Absorption by nonalgal particles (a_(NAP)(λ)) was highly influenced by inorganic particulates, as a result of the largely mineral sediments in Balaton. The relative contributions to the absorption budget varied more widely than oceans with a greater contribution from NAP (up to 30%), and wind speed affected the proportion attributed to NAP, phytoplankton, or CDOM. Ultimately, these data provide knowledge of the heterogeneity of (S)IOPs in Lake Balaton, suggesting the full range of variability must be considered for future improvement of analytical algorithms for constituent retrieval in inland waters.
机译：为了提高湖泊遥感算法的鲁棒性，了解固有光学特性（IOP）及其质量特定表示（SIOP）的可变性至关重要。在这项研究中，在匈牙利巴拉顿湖的生物地球化学梯度分布的38个站点测量了颗粒和溶解成分的吸收系数。在蓝色和红色波长范围内（a_（ph）（440）= 0.11–4.39 m〜（-1），a_（ph_（675）= 0.048–），浮游植物的吸收范围很大（a_（ph）（λ））。 2.52 m〜（-1）），而湖中叶绿素特异性浮游植物吸收（a * _（ph）（λ））的变化较小（a * _（ph）（440）= 0.022±0.0046 m〜 2 mg〜（-1），a * _（ph）（675）= 0.010±0.0020 m〜2 mg〜（-1））和相邻的湿地系统Kis-Balaton（a * _（ph）（440）= 0.017±0.0015 m〜2 mg〜（-1），a * _（ph）（675）50.0088±0.0017 m〜2 mg〜（-1））。但是，在紫外线下，a * _（ph）（350） ）随着距主要入水口（Zala河）距离的增加而显着增加，这可能是由于有色溶解有机物（CDOM）的梯度下降导致光保护性颜料（例如MAA）的产量变化所致。 （S_（CDOM））也由于西部盆地中更大的陆地CDOM输入而从西向东增加。由于la的结果，非藻类颗粒（a_（NAP）（λ））的吸收受到无机颗粒的强烈影响。巴拉顿的主要矿物沉积物。吸收预算的相对贡献比海洋变化更大，NAP贡献更大（高达30％），风速影响了NAP，浮游植物或CDOM的比例。最终，这些数据提供了巴拉顿湖（S）IOP异质性的知识，这表明必须考虑全部可变性，才能进一步改进内陆水域中成分检索的分析算法。

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