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Effects of precipitation on summer epilimnion thickness in tropical lakes

机译：沉淀对热带湖泊夏季癫痫厚度的影响

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This study aimed to evaluate the importance of physical, chemical and biological factors (e.g., chlorophyll-a, and carbon) in the regulation of the summer epilimnion thickness (Zmix) of the tropical lakes focusing on trends of the current environmental variability. We sampled a set of tropical lakes from the middle Rio Doce lacustrine system (Minas Gerais, Brazil) for two consecutive summers. Besides Zmix, we analyzed the visible light attenuation (Kd(PAR)), dissolved organic carbon (DOC), chlorophyll-a (Chl-a), total suspended solids (TSS), and fetch. We also analyze the quality of the dissolved organic matter (DOM) through colored dissolved organic matter (CDOM), spectral slope (S), DOC-specific absorbance (SUVA) and the ratio between the absorbance at 250 nm and 365 nm (E-250:365). Our results showed quite different results during the two years studied. In the summer of 2012, when there was higher rainfall, variations in Zmix were correlated to the optical factors associated with DOM quality, while in the drier summer of 2013 Chl-a, TSS and fetch were the variables that more explained Zmix. It suggests that DOM regulates the Zmix in the rainy periods in the studied tropical lakes and that control is determined by the balance between the DOM input (runoff) and output (such as photodegradafion) of the aquatic systems. In reduced rain conditions (summer 2013), the factors responsible by chemistry photodegradation of DOM were predominant, and the organic matter was no longer controlling Zmix, which was driven by internal mixing, productivity, and the wind (Chl-a, TSS and fetch). In this study we showed how changes in precipitation might cause shifts in the factors that regulate the epilimnion thickness in tropical lakes.
机译：本研究旨在评估物理，化学和生物因素（例如，叶绿素-A和碳）在热带湖泊的夏季癫痫厚度（Zmix）的调节中的重要性，这些湖泊的重点是当前环境变异性的趋势。我们从中间Rio Doce Lapustine System（Minas Gerais，巴西）采样了一套热带湖泊，连续两个夏季。除Zmix外，我们还分析了可见光衰减（Kd（par）），溶解的有机碳（DOC），叶绿素-A（CHL-A），总悬浮固体（TSS）和提取。我们还通过有色溶解有机物（CDOM），光谱斜率，特异性吸光度（SUVA）和250nm和365nm之间的吸光度之间的比例分析溶解有机物（DOM）的质量。 250：365）。我们的结果表明，两年的研究结果发生了相当不同的结果。在2012年夏天，当降雨量较高时，ZMIX的变化与与DOM质量相关的光学因子相关，而在2013年的夏季，TSS和获取的夏天是ZMIX更多说明的变量。它表明，DOM在研究的热带湖泊中的多雨期间调节Zmix，并且该控制由DOM输入（径流）和水生系统的输出（例如Photodgradafion）之间的平衡决定。在降低雨季条件下（2013年夏季），由化学光降解负责DOM的因素是主要的，并且有机物质不再控制Zmix，该Zmix通过内部混合，生产率和风（CHL-A，TSS和FECTH驱动）。在这项研究中，我们展示了降水量的变化可能导致在热带湖泊中调节癫痫厚度的因素中的变化。

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