南海贯穿流季节变化数值模拟研究  

Numerical Simulation of Seasonal Variation of the South China Sea Throughflow

作　　者：刘鑫 韩琦琦 陈学恩 Liu Xin;Han Qiqi;Chen Xueen(College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;Qilu University of Technology (Shandong Academy of Sciences), Shandong Computer Science Center(National Supercomputing Center in Jinan), Jinan 250101, China;Shandong Provincial Key Laboratory of Computer Networks, Jinan 250014, China)

机构地区：[1]中国海洋大学海洋与大气学院,山东青岛266100 [2]齐鲁工业大学(山东省科学院),山东省计算中心(国家超级计算济南中心),山东济南250101 [3]山东省计算机网络重点实验室,山东济南250014

出　　处：《中国海洋大学学报（自然科学版）》2022年第1期12-21,共10页Periodical of Ocean University of China

基　　金：青岛海洋科学与技术试点国家实验室鳌山科技创新计划重大项目(2018ASKJ01-04)资助。

摘　　要：本文采用美国伍兹霍尔研究所研发的海洋-大气-波浪-泥沙输运耦合模式COAWST(Coupled Dcean-Atmosphere-Wave-Sediment Transport)对南海及邻近海域进行了9 km分辨率的数值模拟研究。结果表明,南海贯穿流的季节变化再现了冬强夏弱的特征,在南海内部冬季呈现气旋环流结构,夏季呈现反气旋环流结构,尤其在冬季其流轴结构更为清晰和稳定,海水从吕宋海峡进入南海,从民都洛海峡、卡里马塔海峡、台湾海峡和巴拉巴克海峡流出,吕宋海峡断面流量与其他4个海峡流量合计在数量级上相当,保持南海海水总量不变。吕宋海峡、卡里马塔海峡、民都洛海峡的流量呈现明显相关性,吕宋海峡流量增大时,民都洛海峡和卡里马塔海峡的流量也相应增大,相关系数分别达到0.78和0.9。通过更适于分析中短期变化的简化绕岛环流理论,定量计算2019年吕宋海峡、黑潮和棉兰老流流量与北赤道流分叉点位置的关系,发现夏季北赤道流分叉点NECBL(North Equatorial Current Bifurcation Latitude)偏南,在13.6°N附近;冬季NECBL偏北,在15.6°N左右,同期黑潮流量减少,棉兰老流流量增加,作为南海贯穿流入流的吕宋海峡流量可达13.4 Sv。吕宋海峡输运补偿了北赤道流到达菲律宾海岸后的北向分支的流量,与棉兰老流的流量呈正相关,相关系数达到0.5361。A numerical simulation of the South China Sea(SCS)was constructed by Coupled Ocean Atmosphere-Wave-Sediment Transport(COAWST)model with a spatial resolution of 9 km.The model result shows that the South China Sea throughflow(SCSTF)is stronger(weaker)in winter(summer),also it has a cyclonic(anticyclonic)circulation structure in the SCS in winter(summer).In particular,the flow axis structure of SCSTF is clearer and more stable in winter.The seawater enters the SCS from Luzon Strait(LS)and flows out from Minduro Strait(MiS),Kalimata Strait(KS),Taiwan Strait(TS)and Balabac Strait(BS).The flow of LS is equal to that of the other four straits in order of magnitude for which keeping the total amount of seawater in the SCS unchanged.The volume transports of LS increased,KS and MS also increased,they showed significant correlation and the correlation coefficients reached 0.78 and 0.9,respectively.By using a simplified island rule which is more suitable for short and medium term analysis,the volume transports of LS,Kuroshio Current(KC)and Mindanao Current(MC)will be calculated,in order to find the relationship between the position of North Equatorial Current bifurcation latitude(NECBL)and the volume transports above.The results show that NECBL moves southward in summer,near 13.6°N,and it moves northward in winter,near 15.6°N,the volume transport of KC decreased and the volume transport of MC increased.As the inflow of SCSTF,the volume transports of LS is up to 13.4 Sv in winter.The correlation coefficient between them is 0.5361.

关 键 词：南海贯穿流 海气耦合模式(COAWST) 季节变化 北赤道流分叉点(NECBL) 

分 类 号：P731.21[天文地球—海洋科学]