Anatomy of the recurrent coastal sediment plume in Lake Michigan and its impacts on light climate, nutrients, and plankton
Anatomy of the recurrent coastal sediment plume in Lake Michigan and its impacts on light climate, nutrients, and plankton
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DOI：
10.1029/2004jc002379
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发表时间：
2007-03
影响因子：
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通讯作者：
H. Vanderploeg;T. Johengen;P. Lavrentyev;Changsheng Chen;G. Lang;Megan Agy;M. Bundy;J. Cavaletto;B. Eadie;J. Liebig;G. S. Miller;S. Ruberg;M. Mccormick
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作者：
H. Vanderploeg;T. Johengen;P. Lavrentyev;Changsheng Chen;G. Lang;Megan Agy;M. Bundy;J. Cavaletto;B. Eadie;J. Liebig;G. S. Miller;S. Ruberg;M. Mccormick
[1]作为情景事件五大湖实验的一部分，我们在1998年至2000年2月、3月和4月期间，沿密歇根湖南部沿着跨边缘断面对总悬浮物（TSM）、光气候、营养物质和浮游生物进行了采样，以捕捉之前、期间、在风暴发生后-驱动经常性的沿海沉积物羽流，以确定再悬浮事件的解剖结构，并深入了解它们与营养物质和浮游生物的相互作用。不同年份的冬季风暴的时间和强度的变化导致不同的时间，强度和羽流的范围。烟羽核心的TSM浓度在15至30 mg L−1之间，透光深度减少到1至2 m，因此可能严重限制烟羽区域的浮游植物生长。总P浓度与TSM和河流影响高度相关。叶绿素浓度较低，在羽区比在邻近地区，在相对恒定的叶绿素浓度在整个羽耦合的水动力和营养浮游植物浮游动物模型预测。与预期相反，原生动物微型浮游动物（MZ）的生物量是不是更丰富的羽比邻近的沃茨，但在近岸地区接受河流流入。风暴影响浮游动物的水平分布。由于羽流中浮游植物的浓度较低，在这个食物限制季节，羽流在短期内对浮游动物产生了负面影响。我们的研究结果与其他EEGLE研究的结果相结合，使我们得出结论，风暴和风暴驱动的羽流对南极食物网产生了负面影响。
[1] As part of the Episodic Events Great Lakes Experiment, we sampled total suspended matter (TSM), light climate, nutrients, and plankton along cross-margin transects in southern Lake Michigan during February, March, and April 1998–2000 to capture conditions before, during, and after the occurrence of storm-driven recurrent coastal sediment plumes to define the anatomy of the resuspension events and get insights into their interactions with nutrients and plankton. Variability in timing and strength of winter storms among years led to different timing, intensity, and extent of plumes among years. TSM concentrations in the core of plumes varied between 15 and 30 mg L−1, and photic depth was reduced to ∼1 to 2 m, thus potentially seriously limiting phytoplankton growth in plume areas. Total P concentration was highly correlated with TSM and river influence. Chlorophyll concentrations were lower in plume regions than in adjacent areas, in contrast to the relatively constant chlorophyll concentration across the plume predicted by a coupled hydrodynamic and nutrient-phytoplankton-zooplankton model. Contrary to expectation, protozoan microzooplankton (MZ) biomass was not more abundant in the plume than adjacent waters, but was highest in nearshore areas receiving river inflow. Storms affected horizontal distribution of zooplankton. Because of the lower concentrations of phytoplankton in the plume, the plume over the short term had a negative impact on zooplankton during this food-limiting season. Our results combined with those of other EEGLE studies lead us to conclude that storms and storm-driven plumes had a negative effect on the planktonic food web.