caa a22 4500 605455481 CHVBK 20210128100212.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s10872-015-0295-3 doi (NATIONALLICENCE)springer-10.1007/s10872-015-0295-3 Temporal variability of the current in the northeastern South China Sea revealed by 2.5-year-long moored observations [Elektronische Daten] [Li Cheng, Zhiwei Zhang, Wei Zhao, Jiwei Tian] The current in the northeastern South China Sea (NSCS) has been extensively studied by both observations and numerical models, but its vertical structure and temporal variability are still not well understood because of the lack of long-term and full-depth direct observations. From August 2010 to March 2013, the current velocity in the NSCS was directly observed by Acoustic Doppler Current Profilers from a subsurface mooring at 117°52.07′E, 21°06.68′N. The observed current velocity was coherent in the vertical direction and nearly showed the same sign in the nearly full water column (960m). The observed current presented strong intraseasonal variabilities (ISVs) within periods between 30 and 90days. Analysis of the altimeter observation suggested that the ISVs were closely related to the propagating mesoscale eddies. Corresponding to the seasonally varying circulation in the NSCS, the ISV-removed current roughly showed a semiannual cycle. The seasonal U (V) averaged over 80-200m depths reached the peak in March and October (January and July) and the trough in July and February (April and August), respectively, with a peak-to-trough amplitude of 0.14m/s (0.19m/s). Dynamical modes analysis suggested that the observed current velocity showed dominated energy in the barotropic mode during most of the observation period but enhanced energy in the first baroclinic mode during eddy events because of the enhanced vertical shear of velocity. The Oceanographic Society of Japan and Springer Japan, 2015 Northeastern South China Sea nationallicence Seasonal variabilities nationallicence Intraseasonal variabilities nationallicence Mesoscale eddies nationallicence Circulation nationallicence Cheng Li Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut Zhang Zhiwei Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut Zhao Wei Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut Tian Jiwei Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut Journal of Oceanography Springer Japan 71/4(2015-08-01), 361-372 0916-8370 71:4<361 2015 71 10872 https://doi.org/10.1007/s10872-015-0295-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10872-015-0295-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cheng Li Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut NATIONALLICENCE 700 1- Zhang Zhiwei Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut NATIONALLICENCE 700 1- Zhao Wei Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut NATIONALLICENCE 700 1- Tian Jiwei Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China aut NATIONALLICENCE 773 0- Journal of Oceanography Springer Japan 71/4(2015-08-01), 361-372 0916-8370 71:4<361 2015 71 10872