冬季黄海暖流西偏机理数值探讨

邢传玺; 黄大吉

冬季黄海暖流西偏机理数值探讨

邢传玺¹,
黄大吉^2,

1.
国家海洋局第二海洋研究所,卫星海洋环境动力学国家重点实验室,浙江杭州,310012
2.
国家海洋局第二海洋研究所,卫星海洋环境动力学国家重点实验室,浙江杭州,310012; 浙江大学海洋科学与工程学系,浙江杭州,310058

基金项目: 国家重点基础研究发展计划(2006CB400603);浙江省自然科学基金(R504040);908专项(908-01-BC06)。

计量
- 文章访问数: 1558
- HTML全文浏览量: 20
- PDF下载量: 2143
- 被引次数: 0
出版历程
- 收稿日期: 2010-01-25
- 修回日期: 2010-07-08

Numerical investigation on the mechanism of the westward shifting of the Huanghai Warm Current

XING Chuan-xi¹,
HUANG Da-ji^2
,

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China; Department of Ocean Science and Engineering, Zhejiang University, Hangzhou 310058, China

摘要

摘要: 利用海洋数值模式(MITgcm)模拟了冬季黄海流场并对冬季黄海暖流西偏的机理进行了探讨。冬季黄海流场模拟试验表明,黄海暖流由济州岛以西约32.5°N,125°E附近进入黄海,然后沿着黄海深槽西侧70 m等深线附近向北偏西运动;海面高度调整对黄海暖流路径具有重要影响,沿着黄海暖流路径的海面高度梯度比周围海区大,由海面高度梯度产生的地转流引起的北向体积输运占总的北向体积输运的78%。狭长海湾地形控制试验表明,单纯的黄海地形分布不足以引起黄海暖流西偏。黄海典型断面试验与渤海、黄海、东海地形控制试验说明,黄海暖流进入黄海的地理位置对流场分布有重要影响,黄海暖流进入黄海的位置恰好位于深槽西侧地形坡度较大区域,在位涡守恒的约束下黄海暖流受地形捕获沿70 m等深线附近向北偏西运动;试验还表明,黄海暖流进入黄海的位置与东海北部环流和地形分布有关,在冬季风的作用下东海北部环流的一部分沿着地形陡坡进入黄海形成黄海暖流。由此认为,黄海、东海环流在其特殊地形的约束下对冬季风的响应和调整,是引起黄海暖流西偏的主要原因。
- 黄海 /
- 黄海暖流 /
- 黄海暖流西偏 /
- 位涡守恒 /
- MITgcm
Abstract: The mechanism of the westward shifting of the Huanghai Sea(Yellow Sea) Warm Current (HSWC) is studied through a group of numerical experiments using MIT General Circulation Model (MITgcm). The simulated wintertime Huanghai Sea circulation indicates that after the HSWC enters the Huanghai Sea domain around 32.5°N, 125°E to the west of the Cheju Island, it heads northwestward along the 70 m isobaths to the west of the Huanghai Sea trough. The sea surface height distribution also shows that along the path of the HSWC the sea surface height gradient is greater than the adjacent areas. The northward volume transport induced by the geostrophic current explains 78% of the total northward volume transport, the adjustment of the sea surface height is important to the path the HSWC. The topography control experiments conducted under the elongated semi-enclosed basin show the upwind flow goes along the deep trough regardless of the location of the deep trough, in the central of the basin or sideways. This means the deviation of the Huanghai Sea trough is not sufficient to make the HSWC shift to the west.The experiments performed with the topography of the typical section chosen in the Huanghai Sea tell the position where the HSWC enters the Huanghai Sea is crucial. The HSWC enters the Huanghai Sea domain along 50~70 m isobaths where the topography gradient is greater than adjacent areas. The topography gradient then traps the HSWC to flow along these isobaths. The position where the HSWC enters the Huanghai Sea domain is also related to the sharper topography gradient of the northern East China Sea.The site specific sharper topography gradient influences also the shelf circulation of the northern East China Sea. Under the strong winter monsoon, a part of the East China Sea shelf circulation enters the Huanghai Sea and becomes the HSWC. Therefore, the adjustment of the circulation in the East China Sea and Huanghai Sea under the winter monsoon together with the topography leads to the westward shifting of the HSWC which is trapped along the sharper topography gradient under the constrain of the conservation of the potential vorticity.
- Huanghai Sea /
- Huanghai Sea Warm Current /
- westward shifting /
- vorticity conservation /
- MITgcm

HTML全文

参考文献(19)

袁耀初, 苏纪兰, 赵金三. 东中国海陆架环流的单层模式[J]. 海洋学报, 1982, 4(1):1-10.

HSUEH Y. Recent current observation in the Eastern Yellow Sea[J]. Journal of Geophysical Research, 1988, 93(C6): 6875-6884.

TEAGUE W J, JACOBS G A. Current observations on the development of the Yellow Sea Warm Current[J]. Journal of Geophysical Research, 2000, 105(C2): 3401-3411.

陈达熙. 渤海、黄海、东海海洋图集-水文[M]. 北京:海洋出版社, 1992: 13-96, 241-257.

VAZQUEZ J, PERRY K, KILPATRICK K. NOAA/NASA AVHRR Oceans Pathfinder sea surface temperature data set user's reference manual, Version 4.0 .JPL Technical Report, 1998, D14070.

唐启升, 苏纪兰, 孙松,等. 中国近海生态系统动力学研究进展[J]. 地球科学进展, 2005, 20(12): 1288-1299.

LIE H J, CHO H C, LEE S. Tongue-shaped frontal structure and warm water intrusion in the southern Yellow Sea in winter[J]. Journal of Geophysical Research, 2009, 114, C01003, doi: 10.1029/2007JC004683.

HUANG D J, FAN X P, XU D F, et al. Westward shift of the Yellow Sea warm salty tongue[J]. Geophysical Research Letters, 2005, 32, L24613, doi: 10.1029/2005GL024749.

MARSHALL J, HILL C, PERELMAN L, et al. Hydrostatic, quasi-hydrostatic, and nonhydrostatic ocean modeling[J]. Journal of Geophysical Research, 1997,102(C3):5733-5752.

MARSHALL J, ADCROFT A, HILL C, et al. A finite-volume, incompressible Navier Stokes model for studies of the ocean on parallel computers[J]. Journal of Geophysical Research, 1997,102(C3):5753-5766.

DURSKI S M, GLENN S M, HAIDVOGEL D B. Vertical mixing schemes in the coastal ocean: Comparison of the level 2.5 Mellor-Yamada scheme with an enhanced version of the K profile parameterization[J]. Journal of Geophysical Research, 2004, 109(C1): C01015.

樊孝鹏,黄大吉,章本照. 东海黑潮的气候态数值模拟[J]. 浙江大学学报(工学版), 2006, 40(5): 916-920.

QuikSCAT data are produced by Remote Sensing Systems and sponsored by the NASA Ocean Vector Winds Science Team .Available at http://www.remss.com.

NODC_WOA98 data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.cdc.noaa.gov/.

CSANADY G T. Wind-induced barotropic motions in long lakes[J]. Journal of Physical Oceanography, 1973, 3(4): 429-438.

WONG K C. On the nature of transverse variability in a coastal plain estuary[J]. Journal of Geophysical Research, 1994, 99(C7): 14209-14222.

WINANT C. Three-dimensional wind-driven flow in an elongated, rotating basin[J]. Journal of Physical Oceanography, 2004, 34(2):462-476.

VALLE-LEVINSON A, REYES C, SANAY R. Effects of bathymetry, friction, and rotation on estuary-ocean exchange[J]. Journal of Physical Oceanography, 2003, 33(11): 2375-2393.

SANAY R, VALLE-LEVINSON A. Wind-induced circulation in semienclosed homogeneous, rotating basins[J]. Journal of Physical Oceanography, 2005, 35(12): 2520-2531.

施引文献

资源附件(0)

访问统计