Variability of the bottom boundary layer induced by the dynamics of the cross-isobath transport over a variable shelf
编号:711 访问权限:仅限参会人 更新:2024-10-17 22:39:31 浏览:213次 口头报告

报告开始:2025年01月16日 14:45(Asia/Shanghai)

报告时间:15min

所在会场:[S24] Session 24-Estuaries and Coastal Environments Stress - Observations and Modelling [S24-2] Estuaries and Coastal Environments Stress - Observations and Modelling

暂无文件

摘要
The bottom boundary layer (BBL) dynamics play an important role in regulating the energy, momentum balance, and circulation in the shallow shelf areas. Unlike previous studies that disconnect BBL with background variable shelf circulation, we investigate the dynamic connection between the wind-driven shelf circulation and BBL dynamics, and indicate the spatial characteristics of BBL dynamics in response to three-dimensional heterogeneous transport over the highly variable shelf topography. Our process-oriented modeling study demonstrates that the mixing dynamics and upslope buoyancy transport over varying shelf topography alter the spatial variability of BBL dynamics in the Northern South China Sea. Driven by southwesterly upwelling-favorable winds, the along-shelf current generated a frictional upslope Ekman transport. The along-isobath pressure gradient force (PGFx*) arise from the flow-topography interactions over the meandering shelf induced the geostrophic cross-isobath transport (GCT). The downwave (upwave) PGFx* enhanced (offset) the frictional upslope transport over the east (west) of the shelf that had a concaving (uniform) bottom topography. Over the eastern shelf with concave isobaths, the intensified PGFx*and upslope cross-isobath dense water transport strengthened stratification and weakened the effect of bottom stress-induced mixing, limiting the development of the BBL. The antithesis occurred over the western shelf, where a small bottom stress controlled the BBL. River discharge and the tidal current modulated the alongshore current, upslope transport, bottom stress intensity, and BBL development. We modeled the trajectory of seabed particles as they responded to the BBL dynamic regimes, and we found that high (low) concentration, short (long) suspension time, and strong (weak) shoreward transport occurred over the eastern (western) shelf, respectively.
 
关键词
Turbulent boundary layer,northern SCS shelf,circulation
报告人
Weicong Cheng
PhD Hong Kong University of Science and Technology

稿件作者
Weicong CHENG Hong Kong University of Science and Technology
Jianping Gan The Hong Kong University of Science and Technology
发表评论
验证码 看不清楚,更换一张
全部评论
重要日期
  • 会议日期

    01月13日

    2025

    01月17日

    2025

  • 09月27日 2024

    初稿截稿日期

  • 01月17日 2025

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
承办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
Department of Earth Sciences, National Natural Science Foundation of China
联系方式
移动端
在手机上打开
小程序
打开微信小程序
客服
扫码或点此咨询