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首页> 外文期刊>Estuarine Coastal and Shelf Science >Short-term variability of suspended sediment and phytoplankton in Tampa Bay, Florida: Observations from a coastal oceanographic tower and ocean color satellites
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Short-term variability of suspended sediment and phytoplankton in Tampa Bay, Florida: Observations from a coastal oceanographic tower and ocean color satellites

机译：佛罗里达坦帕湾悬浮悬浮物和浮游植物的短期变化：来自沿海海洋学塔和海洋彩色卫星的观测

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摘要

We examined short-term phytoplankton and sediment dynamics in Tampa Bay with data collected between 8 December 2004 and 17 January 2005 from optical, oceanographic, and meteorological sensors mounted on a coastal oceanographic tower and from satellite remote sensing. Baseline phytoplankton (chlorophyll-a, Chl) and sediment concentrations (particle backscattering coefficient at 532 nm, bbp (532)) were of the order of 3.7 mg m~(-3) and 0.07 m~(-1) respectively, during the study period. Both showed large fluctuations dominated by semidiurnal and diurnal frequencies associated with tidal forcing. Three strong wind events (hourly averaged wind speed >8.0 m s~(-1) generated critical bottom shear stress of >0.2 Pa and suspended bottom sediments that were clearly observed in concurrent MODIS satellite imagery. In addition, strong tidal current or swells could also suspend sediments in the lower Bay. Sediments remained suspended in the water column for 2-3 days after the wind events. Moderate Chi increases were observed after sediment resuspension with a lag time of ~(l- 2) days, probably due to release of bottom nutrients and optimal light conditions associated with sediment resuspension and settling. Two large increases in Chi with one Chl > 12.0 mg m~(-3) over~2 days, were observed at neap tides. For the study site and period, because of the high temporal variability in phytoplankton and sediment concentrations, a monthly snapshot can be different by -50% to 200% from the monthly "mean" chlorophyll and sediment conditions. The combination of high-frequency observations from automated sensors and synoptic satellite imagery, when available, is an excellent complement to limited field surveys to study and monitor water quality parameters in estuarine environments.
机译：我们使用从2004年12月8日至2005年1月17日之间从沿海海洋塔上安装的光学，海洋和气象传感器以及卫星遥感收集的数据，研究了坦帕湾的短期浮游植物和沉积物动态。在此期间，基线浮游植物（叶绿素-a，Chl）和沉积物浓度（532 nm处的粒子反向散射系数，bbp（532））分别约为3.7 mg m〜（-3）和0.07 m〜（-1）。学习时段。两者均表现出较大的波动，主要由与潮汐强迫有关的半日和日频率所主导。在同时进行的MODIS卫星图像中可以清楚地观察到三个强风事件（每小时平均风速> 8.0 ms〜（-1）产生的临界底部切应力> 0.2 Pa和悬浮的底部沉积物），此外，强潮流或浪涌也可能在下风后的2-3天内，沉积物在水柱中保持悬浮状态；在沉积物重悬后，池中的Chi出现了适度的增加，滞后时间约为（1-2）天，这可能是由于底潮时观测到底部养分和与沉积物重悬和沉降相关的最佳光照条件，在潮汐的两天内，Chi出现了两个大的增加，其中Chl> 12.0 mg m〜（-3）。由于浮游植物和沉积物浓度随时间变化较大，因此每月快照与每月“平均”叶绿素和沉积物状况之间可能存在-50％至200％的差异。可用的传感器和天气卫星图像可以很好地补充有限的野外调查，以研究和监控河口环境中的水质参数。

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