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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal observations of surface waters in two Gulf of Maine estuary-plume systems: Relationships between watershed attributes, optical measurements and surface pCO_2
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Seasonal observations of surface waters in two Gulf of Maine estuary-plume systems: Relationships between watershed attributes, optical measurements and surface pCO_2

机译：缅因州湾两个河口-湖泊系统中地表水的季节性观测：流域属性，光学测量值与地表pCO_2之间的关系

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摘要

The partial pressure of carbon dioxide (PCO_2) in estuary-plume systems is related to the internal processes of net organic metabolism and physical mixing, but is also strongly influenced by biogeochemical inputs from the land and ocean. Surface layer pCO_2, stimulated fluorescence of chlorophyll (f-chl) and colored organic matter (f-com), and beam attenuation at 660 nm (c-660) were measured during three seasonal surveys of the Kennebec (ME) and Merrimack (MA) estuary-plume systems. These estuaries are both supplied by large New England Rivers and sep-arated by less than 150 km, but significant differences were often observed in the distributions of surface pCO_2 and optical variables. High PCO_2 concentrations were generally associated with high f-com, while lower pCO_2 concentrations were associated with high f-chl and c-660. Using simple regression models, optical measurements were used to estimate chlorophyll and total organic carbon concentrations. Results suggest that labile riverine carbon is responsible for sustaining supersaturated pCO_2 conditions and that phytoplankton productivity, likely driven by inputs of riverine dissolved inorganic nitrogen, is responsible for pCO_2 undersaturation. Although optical variables are often related to surface pCO_2, the results suggest that efforts to retrieve pCO_2 in complex waters using optical data may be enhanced using a site-specific, multivariate approach.
机译：河口-水体系统中的二氧化碳分压（PCO_2）与净有机代谢和物理混合的内部过程有关，但也受到陆地和海洋生物地球化学输入的强烈影响。在对肯尼贝克（ME）和梅里马克（MA）的三个季节性调查中，测量了表面层pCO_2，叶绿素（f-chl）和有色有机物（f-com）的激发荧光以及660 nm（c-660）的光束衰减。 ）河口-水流系统。这些河口都是由新英格兰大河提供的，相隔不到150公里，但通常在表面pCO_2的分布和光学变量方面存在显着差异。高PCO_2浓度通常与高f-com有关，而较低pCO_2浓度与高f-chl和c-660有关。使用简单的回归模型，使用光学测量来估算叶绿素和总有机碳浓度。结果表明，不稳定的河流碳负责维持过饱和的pCO_2条件，而浮游植物的生产力可能是由河流溶解的无机氮的输入驱动的，而造成了pCO_2的不饱和。尽管光学变量通常与表面pCO_2有关，但结果表明，使用特定地点的多变量方法可以增强使用光学数据在复杂水中检索pCO_2的努力。

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