TY - JOUR
AU1 - Auger, Guillaume
AU2 - Yamazaki, Hidekatsu
AU3 - Nagai, Takeyoshi
AU4 - Jiao, Chunmeng
AU5 - Kumagai, Michio
AB - A 48-h microstructure experiment captured the variation of turbulence in Lake Biwa, Japan, during a strong stratification period, 1 week after a typhoon event. A free-fall microstructure profiler (TurboMAP) and a fine-scale profiler (F-probe) were deployed. An array of five ADCPs positioned close to the experiment site provided current measurements associated with the internal-wave field for a period of one week. Strong winds related to the passage of a typhoon close to the lake generated two low-frequency internal waves: a Kelvin wave and an inertial wave. Both waves were in the first baroclinic mode. This study pictures the superposition of two large-scale internal waves and a stronger current resulting from the two waves being in phase. The synchronization of the waves provoked enhanced shear in the hypolimnion, more than 10 m above the bottom, as well as high dissipation (10−7 W kg−1) and vertical diffusivity reaching 10−4 m2 s−1. The enhanced shear event seems to be related to the current amplitude since it occurred when the current amplitude was increased by the diel wind. Assuming the same turbulence intensity for the enhanced hypolimnetic shear events, this superposition may affect nutrient transfer in the hypolimnion. Also, we witnessed sediment resuspension, consisting of high turbidity and high fluorescence intensity, likely due to a combination of bottom stress and enhanced turbulence.
TI - Hypolimnetic turbulence generation associated with superposition of large-scale internal waves in a strongly stratified lake: Lake Biwa, Japan
JF - Limnology
DO - 10.1007/s10201-013-0401-4
DA - 2013-02-22
UR - https://www.deepdyve.com/lp/springer-journals/hypolimnetic-turbulence-generation-associated-with-superposition-of-CDsPaWXgZh
SP - 229
EP - 238
VL - 14
IS - 3
DP - DeepDyve
ER -