scholarly journals The Effect of Water Column Resonance on the Spectra of Secondary Microseism P Waves

2017 ◽  
Vol 122 (10) ◽  
pp. 8121-8142 ◽  
Author(s):  
Matthias Meschede ◽  
Éléonore Stutzmann ◽  
Véronique Farra ◽  
Martin Schimmel ◽  
Fabrice Ardhuin
Keyword(s):  
Water Column ◽  
P Waves ◽  
Effect Of Water

scholarly journals Effect of Water Column Stability on Surface Chlorophyll and Time Lags under Different Nutrient Backgrounds in a Deep Reservoir

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1504 ◽  
Author(s):  
Min Zhang ◽  
Zhipan Niu ◽  
Qinghua Cai ◽  
Yaoyang Xu ◽  
Xiaodong Qu
Keyword(s):  
Water Column ◽  
Algal Blooms ◽  
Cyanobacterial Blooms ◽  
Hydrodynamic Process ◽  
Time Lags ◽  
Chl A ◽  
Water Column Stability ◽  
Effect Of Water ◽  
Cross Correlation Analysis ◽  
Short Time

Hydrodynamic conditions are considered to be very important in the control of algal blooms. Weekly or daily measurements may miss some important events in the hydrodynamic process, resulting in inaccurate evaluations of the impacts of hydrodynamics on phytoplankton. In this study, high-frequency (15-min interval) measurements were used to analyze the effect of water column stability on surface chlorophyll a (Chl a) and lag time under different nutrient backgrounds during a cyanobacterial bloom in the Three Gorges Reservoir, China. Cross-correlation analysis between the relative water column stability (RWCS) and Chl a was performed at different stages. The results showed that the RWCS above the euphotic depth influenced the surface Chl a concentration most significantly. A lower RWCS (<20) limited the increase in the Chl a concentration, and a higher RWCS caused a significant increase in Chl a only when nutrients were not limited (TN/TP < 29) and light and temperature conditions were suitable. It took a short time for a higher RWCS to significantly increase the surface Chl a concentration compared with a lower RWCS. When the waterbody had a very low Chl a concentration (almost 0), approximately 2 days were needed to significantly increase the Chl a concentration, while approximately only half an hour was needed when the background concentration of Chl a was slightly higher. During the bloom period, a decline in the RWCS significantly decreased the Chl a in a very short time (approximately half an hour). Reducing the water column stability could be a good approach to control cyanobacterial blooms.

scholarly journals Effect of water column light gradient on phytoplankton fluorescence transients

2009 ◽  
Vol 376 ◽  
pp. 85-101 ◽  
Author(s):  
M Raateoja ◽  
BG Mitchell ◽  
H Wang ◽  
E Olivo
Keyword(s):  
Water Column ◽  
Effect Of Water ◽  
Light Gradient ◽  
Fluorescence Transients
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