Three dimensional diagnostic modeling study of the South China Sea circulation before onset of summer monsoon in 1998 |
| |
Authors: | Yaochu Yuan Guanghong Liao Xiaohua Xu |
| |
Institution: | (1) State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, P.R. China |
| |
Abstract: | The wind data from NCEP and hydrographic data obtained from April 22–May 24, 1998 have been used to compute the circulation
in the South China Sea (SCS) using three dimensional diagnostic models. The main numerical results with SSHA derived from
T/P altimeter are as follows: most of intruded Kuroshio bypasses. However, a part of Kuroshio intrudes westward above 300
m levels. This intruded westward flow is narrowly confined to the continental slope south of China, in agreement with the
findings of Qu et al. (2000). The basin-scale cyclonic gyre dominates in the northern SCS and consists of two cyclonic eddies, C2 and C3, above
300 m levels. However, it is separated into two parts by an anti-cyclonic eddy, W4, below 300 m. The basin-scale anti-cyclonic
gyre dominates in the central SCS and consists of three anti-cyclonic eddies, W1, W2 and W3, above 300 m levels. However,
below 300 m it consists of the anti-cyclonic eddies W1, W2 and W4 and extends northward to near 20°N. A northward coastal
jet is present near the coast of Vietnam at depths above 300 m, and develops northward further to about a distance of 3°15′
N than that in cruise 2. The most important dynamical mechanism is due to the joint effect of the baroclinity and relief.
The second dynamical mechanism is due to the interaction between the wind stress and relief. The topography effect is more
important than the β effect. The Sverdrup relation cannot be satisfied in the SCS. |
| |
Keywords: | SCS circulation before the onset of summer monsoon in 1998 three dimensional diagnostic modeling cyclonic and anti-cyclonic eddies basin-scale gyre dynamical causes JEBAR and IBWSR |
本文献已被 SpringerLink 等数据库收录! |
|