文献类型：期刊文献

英文题名：_????????????????????On the Variation of Dissipation Flux Coefficient in the Upper South China Sea

作者：Li, Jianing[1,2];Yang, Qingxuan[1,2,3,4];Sun, Hui[1,2];Zhang, Shuwen[5];Xie, Lingling[6,7];Wang, Qingye[4,8,9];Zhao, Wei[1,2,3,4];Tian, Jiwei[1,2,3,4]

机构：[1]Ocean Univ China, Coll Ocean & Atmospher Sci, Inst Adv Ocean Study, Phys Oceanog Lab, Qingdao, Peoples R China;[2]Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Qingdao, Peoples R China;[3]Ocean Univ China, Sanya Oceanog Inst, Sanya, Peoples R China;[4]Pilot Natl Lab Marine Sci & Technol, Lab Ocean Dynam & Climate, Qingdao, Peoples R China;[5]Shantou Univ, Inst Marine Sci, Shantou, Peoples R China;[6]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang, Peoples R China;[7]Guangdong Key Lab Climate, Resources & Environm Continental Shelf Sea & Deep, Zhanjiang, Peoples R China;[8]Chinese Acad Sci, Inst Oceanol, G Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China;[9]Univ Chinese Acad Sci, Beijing, Peoples R China

年份：2023

卷号：53

期号：2

起止页码：551

外文期刊名：JOURNAL OF PHYSICAL OCEANOGRAPHY

收录：SCI-EXPANDED(收录号：WOS:000930514600007)、、EI(收录号：20230813612974)、Scopus(收录号：2-s2.0-85148294992)、WOS

基金：Acknowledgments. This work was supported by the National Natural Science Foundation of China (Grants 42076012, 42006012, 41676008, and 92158201), the Natural Science Outstanding Youth Fund of Shandong Province (ZR2019JQ13), the College Innovation Team Project of Guangdong Province (2019KCXTF021), and the National Key Research and Development Program of China (2017YFA0604102).

语种：英文

外文关键词：Diapycnal mixing; Microscale processes; variability; Data processing; distribution

外文摘要：This study focuses on the statistical features of dissipation flux coefficient gamma in the upper South China Sea (SCS). Based on the microscale measurements collected at 158 stations in the upper SCS and derived dissipation rates of turbulent kinetic energy and temperature variance epsilon and x(T) , via a modified method, we estimate gamma and analyze its spatiotemporal variation in an energetic and a quiescent region. We show that gamma is highly variable, which scatters over three orders of magnitude from 10(-21) to 10(1) in both regions. In the energetic region, gamma is slightly greater than in the quiescent region; their median values are 0.23 and 0.17, respectively. Vertically, gamma presents a clear increasing tendency with depth in both regions, though the increasing rate is greater in the energetic region than in the quiescent region. In the upper SCS, gamma positively depends on the buoyancy Reynolds number Reb and negatively depends on the ratio of the Ozmidov scale to the Thorpe scale R-OT and is scaled as gamma alpha Re-b(1/2) R-OT(-4/3) , which holds for both regions. The vertical decreasing of R-OT is observed, which yields parameterization of R-OT = 10(-0.002z) this parameterization improves the performance of the Thorpe scale method by reducing at least 50% of the bias between the observed and parameterized epsilon. These results shed new light on the spatiotemporal variability and modulating mechanism of gamma in the upper ocean.