南海混合层深度的季节和年际变化特征-海洋预报

南海混合层深度的季节和年际变化特征

单位：南京信息工程大学, 数学与统计学院, 江苏南京 210044

分类号：P731.2

出版年·卷·期（页码）：2013·30·第三期（9-17）

摘要：

利用1871—2008年SODA资料和月平均的Levitus资料计算了南海混合层深度(MLD)的季节及年际变化特征。资料分析表明：季风通过流场调整对南海MLD的时空分布特征有显著的影响。南海MLD的距平变化总体上呈上升趋势，南海南部MLD的距平变化趋势和北部的有显著差异，特别在1955年后北部整体呈下降趋势而南部呈上升趋势，二者的显著周期北部为2—3年，南部与整个区域平均的基本相似有2—6年的显著周期。SOI指数对滞后的南海各个区域有较好的相关性。EOF分析表明第一模态整体呈单极型最大变率分布在南海南部，由南往北逐渐减小显著周期2—3年变化为主；第二模态呈偶极子型，显著周期以2—5年变化为主。回归分析表明南海南部深水区域呈现增深的趋势，而吕宋海峡至南海北部陆架区呈变浅趋势，滑动t检验表明南海MLD有6个显著的突变年份。

Based on the Simple Ocean Data Assimilation (SODA) data, characteristics of seasonal and inter-annual variations of the mixed layer depth (MLD) in the South China Sea (SCS) are derived. Data analysis indicates that monsoon has an obvious impact on the temporal and spatial features of MLD in the SCS through an adjustment of the current field. The MLD of the SCS has a deepening trend in general, however the differences between northern and southern areas are obvious, for example there is a shallowing trend in the north but opposite in the south after 1955. The main period is 2—3a in the north while 2—6a in the south and the area average of the SCS. The variability of MLD was analyzed by the Empirical Orthogonal Function (EOF) and Spectrum method. The first mode shows that the variability is same in the whole area of SCS basically and the main cycle is about 2—3a. The second mode shows that the variability is dipole-type and the main cycle is 2—5a. The trend of MLD in the SCS is different from the north to the south, that is, it is shallowing from the Luzon Strait to the west continental shelf in theSCS, and is deepening in the deep basin of the southern SCS. There are six times suddenly change of MLD detected by moving t-test technique.

参考文献：

[1] 施平,杜言,王东晓,等. 南海混合层年循环特征[J]. 热带海洋学报,2001,20(1):10-17.
[2] 王东晓,周发琇,秦曾灏.南海上层海洋环流两层半模式的数值模拟[J]. 海洋学报,1996,18(5):30-40.
[3] 何有海,关翠华,王盛安.南海南部热结构和水温的垂直分布.南沙群岛海区物理海洋学研究论文集[M].北京:海洋出版社,1994.167-177.
[4] 王东晓,周发琇,李永平.南海表层水温和海面热收支的年循环特征[J]. 海洋学报,1997,19(3):33-44.
[5] 杨海军,刘秦玉.南海表层水温分布的季节特征[J]. 海洋与湖沼,1998,29(5):501-507.
[6] 刘辉,江丽芳,齐义泉.南沙群岛海域混合层深度季节变化特征[J].海洋科学进展,2007,25(3):268-279.
[7] 李丽平,靳莉莉.热带太平洋混合层深度的年际异常及其与中国夏季降水关系分析[J].热带气象学报,2010,26,(6):659-666.
[8] Jin Q H,Wang H. Multitime scale variations of sea surface temperaturein the China seas based on the HadISST dataset[J]. ActaOceanol. Sin, 2011,30(4):14-23.
[9] Wang C, Wang W Q, Wang D X, et al. Interannual variability ofthe South China Sea associated with El Nino [J]. Journal of Geophys.Res, 2006,111, C03023, doi:10.1029/2005JC003333.
[10] Qu T D, Du Y, Gan J P, et al. Mean seasonal cycle of isothermaldepth in the South China Sea [J]. Journal of Geophys.Res,2007,112,C02020,doi:10.1029.
[11] Qu T. Role of ocean dynamics in determining the mean seasonalcycle of the South China Sea surface temperature. Journal ofGeophys.Res, 2001,106,6943-6955.
[12] Yang H J, Liu Q Y, Jia X J. On the upper oceanic heat budget inthe South China Sea: Annual cycle [J]. Advances in AtmosphericSciences, 1999, 16(4) : 619-629.
[13] 刘秦玉,贾旭晶,孙即霖,等. 1998 年夏季风爆发前后南海上混合层的特征及成因[J].气候与环流研究, 2000,5(4):469-481.
[14] 刘秦玉,孙即霖,贾旭晶.春季南海南部上混合层数值模拟与数值实验[J].青岛海洋大学学报,2001,31(2) : 6-14.
[15] 孙成学,刘秦玉,贾英来.南海混合层深度的季节变化及年际变化特征[J].中国海洋大学学报.2007,37(2):197-203.
[16] Huang R X, Qiu B. There-dimensional structure of the winddrivencirculation in the subtropical North Pacific [J] .J PhysOceanogr, 1994, 24: 1608-1622.
[17] 贾英来,刘秦玉,孙即霖.南海暖水的季节变化特征及数值模拟[J].海洋与湖沼.2000,31(4):354-362.
[18] 蔡树群,甘子钧.三维斜压陆架海模式的应用:南海上混合层的季节变化[J].海洋学报.2000,22(3):7-14.

服务与反馈：

【文章下载】【发表评论】【查看评论】【加入收藏】