讲座报告 Seminar
Luncheon Seminar #80: Observed submesoscale characteristics in the upper northern South China Sea  
【时间 Time】:2017-8-7 (星期一) 11:40-13:00    【浏览次数 Count】:621   【发布时间 Updated】:2017-8-1
【地点 Venue】:周楼泉楼 A3-206   A3-206 Zhou Long Quan Building
【主讲人 Speaker】:林宏阳,博士    Hongyang Lin, Dr
【来访单位 Institution】:厦门大学,中国    Xiamen University, China
【邀请人 Host】:Jianyu Hu      【联络人 Contact】:Suwei Weng

Abstract

Submesoscale turbulence is important in closing oceanic energy pathway from forcing to dissipative scales. Based on in situ underway velocity and hydrographic measurements throughout the four seasons, this study investigates the seasonality of submesoscale turbulence in the upper northern South China Sea. In spring and summer, the spectral slope of potential energy spectra within 1–10 km is close to k-3, consistent with interior quasigeostrophic dynamics, while it is close to k-2 in autumn and winter, suggestive of enhanced impacts of ageostrophic submesoscale dynamics. Density wavenumber spectra for an anticyclonic eddy show a steeper spectral slope at eddy periphery than that at eddy center, opposite to previous observations and theoretical expectation. High-resolution sea-surface-temperature images imply that the discrepancy is probably due to the fact that transects selected at eddy center have experienced stronger temperature gradients than those at eddy peripheries.

In addition, this talk will also cover preliminary results from a recent cruise (May 2017) that was dedicated to study submesoscale, cross-frontal, processes in the Taiwan Strait. The observations were designed to be submesoscale-resolving (~2 km resolution) in the frontal region.

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