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- W3088082161 abstract "<p>In order to study the characteristics of turbulence over&#160;the&#160;homogeneous&#160;and&#160;inhomogeneous underlying surfaces&#160;and its effects&#160;on the transport of material and energy&#160;in&#160;the Source Region&#160;of the Yellow River&#160;(SRYR), northeast of the Tibetan Plateau. We use&#160;the GPS sounding data and eddy covariance data observed during a field experiment in the Ngoring Lake Basin in summer 2012, and for the first time large eddy simulations are performed to investigate the characteristics of the fine turbulence&#160;structure in the convective boundary layer (CBL) of the two different underlying surfaces&#160;(grassland and lake)&#160;in the SRYR. It&#160;shows that the simulated CBLs of grassland and lake in the SRYR&#160;is in good agreement with the observations, but the characteristics of the turbulence&#160;structure in&#160;the CBLs&#160;are obviously different. The spatio-temporal distribution of turbulence&#160;energy and the structure characteristics of thermal bubbles in the CBL above the grassland&#160;are consistent with those of the typical thermally driven CBL&#160;above the land. Convective rolls&#160;are simulated in the&#160;shear dominant CBL&#160;above&#160;the lake. Turbulence intensity in the surface layer above the grassland is higher, while it is larger at the top of CBL above the lake due to the strong entrainment. We also found that the simulations&#160;are sensitive to&#160;the horizontal resolution&#160;on the two different&#160;homogeneous&#160;underlying surfaces. The&#160;higher horizontal resolution&#160;should applied to the CBL above the lake to improve&#160;the accuracy in&#160;the simulation of turbulence&#160;kinetic energy and turbulence&#160;flux&#160;of&#160;the surface&#160;layer&#160;and the entrainment layer, while avoiding underestimating the turbulence&#160;flux due to the small range of the waves simulated at low resolution. For the CBL&#160;of the grassland, it is suggested that the grid distance should be between 200 m-300&#160;m, which can save the calculation time,&#160;also can give&#160;the turbulence&#160;flux and the&#160;fine turbulence&#160;structure.&#160;In addition, 3-D simulations are also performed to figure out the differences&#160;of turbulence intensity over&#160;homogeneous&#160;and&#160;inhomogeneous underlying surfaces. It is found that lake breeze induced by surface inhomogeneity would enhance the wind shear, decreasing the intensity of vertical turbulence and increasing that of horizontal turbulence.</p>" @default.
- W3088082161 created "2020-10-01" @default.
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- W3088082161 date "2020-03-23" @default.
- W3088082161 modified "2023-10-16" @default.
- W3088082161 title "Large eddy simulation of boundary-layer turbulence over different underlying surfaces in the Source Region of the Yellow River, northeastern Tibetan Plateau" @default.
- W3088082161 doi "https://doi.org/10.5194/egusphere-egu2020-6283" @default.
- W3088082161 hasPublicationYear "2020" @default.
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