Seasonal thermal fronts on the northern South China Sea shelf: Satellite measurements and three repeated field surveys
Jing, Zhiyou; Qi, Yiquan; Fox-Kemper, Baylor; Du, Yan; Lian, Shumin; Jing, ZY (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China.
2016
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷号121期号:3页码:1914-1930
摘要Seasonal thermal fronts associated with wind-driven coastal downwelling/upwelling in the northern South China Sea are investigated using satellite measurements and three repeated fine-resolution mapping surveys in winter, spring, and summer. The results show that vigorous thermal fronts develop over the broad shelf with variable widths and intensities in different seasons, which tend to be approximately aligned with the 20-100 m isobaths. Driven by the prevailing winter/summer monsoon, the band-shaped fronts were observed with a magnitude exceeding 0.1 degrees C/km in the subsurface, and accompanied by energetic coastal downwelling/upwelling due to shoreward/offshore Ekman transport. The downward/upward tilting of seasonal thermoclines across the shelf exceeds 20 m, significantly contributing to the development of thermal fronts over the shelf. In addition, the diagnostic analysis of Potential Vorticity (PV) suggests that the summer frontal activities induced by the coastal upwelling are more stable to convection and symmetric instabilities in comparison to the winter fronts associated with downwelling-favorable monsoon forcing. This is primarily due to their essential differences in the upper ocean stratification and horizontal buoyancy gradients arising from wind forcing. At the same time, the coastal currents are substantially regulated by the seasonal winds. An expected lag correlation between the velocity from mooring measurements and alongshore wind stress is detected near the frontal region. These results indicate that seasonal wind forcing plays an important role in the frontal activities and coastal water transport over the shelf.
部门归属[Jing, Zhiyou; Qi, Yiquan; Du, Yan; Lian, Shumin] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Fox-Kemper, Baylor] Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA ; LTO
学科领域Oceanography
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15556
专题热带海洋环境国家重点实验室(LTO)
通讯作者Jing, ZY (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China.
推荐引用方式
GB/T 7714
Jing, Zhiyou,Qi, Yiquan,Fox-Kemper, Baylor,et al. Seasonal thermal fronts on the northern South China Sea shelf: Satellite measurements and three repeated field surveys[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2016,121(3):1914-1930.
APA Jing, Zhiyou,Qi, Yiquan,Fox-Kemper, Baylor,Du, Yan,Lian, Shumin,&Jing, ZY .(2016).Seasonal thermal fronts on the northern South China Sea shelf: Satellite measurements and three repeated field surveys.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,121(3),1914-1930.
MLA Jing, Zhiyou,et al."Seasonal thermal fronts on the northern South China Sea shelf: Satellite measurements and three repeated field surveys".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 121.3(2016):1914-1930.
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