Simulation and Exploration of the Mechanisms Underlying
the Spatiotemporal Distribution of Surface
Mixed Layer Depth in a Large Shallow Lake |
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Authors: | ZHAO Qiaohu SUN Jihua and ZHU Guangwei |
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Institution: | College of Remote Sensing, Nanjing University of Information Science and Technology,
Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing 210044;Yunnan Institute of Metrological Science, Kunming 650034;State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology,
Chinese Academy of Sciences, Nanjing 210008 |
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Abstract: | The aquatic eco-environment is significantly affected by temporal and
spatial variation of the mixed layer depth (MLD) in large shallow lakes. In
the present study, we simulated the three-dimensional water temperature of
Taihu Lake with an unstructured grid with a finite-volume coastal ocean
model (FVCOM) using wind speed, wind direction, short-wave radiation and
other meteorological data measured during 13--18 August 2008. The simulated
results were consistent with the measurements. The temporal and spatial
distribution of the MLD and the possible relevant mechanisms were analyzed
on the basis of the water temperature profile data of Taihu Lake. The
results indicated that diurnal stratification might be established through
the combined effect of the hydrodynamic conditions induced by wind and the
heat exchange between air and water. Compared with the net heat flux, the
changes of the MLD were delayed approximately two hours. Furthermore, there
were significant spatial differences of the MLD in Taihu Lake due to the
combined impact of thermal and hydrodynamic forces. Briefly, diurnal
stratification formed relatively easily in Gonghu Bay, Zhushan Bay, Xukou
Bay and East Taihu Bay, and the surface mixed layer was thin. The center of
the lake region had the deepest surface mixed layer due to the strong mixing
process. In addition, Meiliang Bay showed a medium depth of the surface
mixed layer. Our analysis indicated that the spatial difference in the
hydrodynamic action was probably the major cause for the spatial variation
of the MLD in Taihu Lake. |
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Keywords: | mixed layer depth temporal and spatial distribution Taihu Lake thermal stratification |
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