摘要
为研究南极绕极流(ACC)流量变化无明显年代际变化的原因,利用长时间序列(1993—2017年)再分析月平均三维流速场、海面高度异常和海面风场等变量数据,计算ACC穿过德雷克海峡的流量、涡动能(EKE)和平均风速,并对3个变量之间的相关关系进行了分析。结果显示:涡动能和平均风速随着时间的推移而不断增大,但ACC流量则保持平稳。风速与滞后其7个月、8个月、16个月和19个月的涡动能呈弱正相关关系,相关系数分别为0.177 8、0.160 0、0.123 0和0.238 7。ACC流量和涡动能为立即响应的弱负相关关系,相关系数为-0.149 2。风速与滞后其1个月的ACC流量呈弱正相关关系,相关系数为0.131 5,风速与滞后其6个月的ACC流量呈弱负相关关系,相关系数为-0.133 3。3个变量相互之间的相关关系表明,随着平均风速的增大,ACC流量随着风应力的增长而升高,风应力的增长会促进涡动能增长,而涡动能又会反过来耗散部分风场输入的动能,导致ACC流量降低,从而维持ACC流量年代际变化的稳定。
In order to study the reasons why there is no obvious interdecadal change in the transport of the Antarctic Circumpolar Current(ACC),we calculated the transport of ACC in the Drake Passage,eddy kinetic energy(EKE)and mean wind speed based on the long time(1993—2017)reanalysis of monthly mean data which contained 3D velocity field,sea surface anomaly and sea surface wind field.Then we analyzed the correlation between these three variables.The EKE and wind speed showed increasing trend with the change of time,while the trend of transport of ACC remained stable.There is a weak positive correlation between the wind speed and EKE of 7 month later,and the correlation coefficient was 0.177 8.The transport of ACC and EKE showed weakly negative correlation in immediate response,and the correlation coefficient was-0.149 2.The wind speed and transport of ACC of one month later showed weakly positive correlation,and the correlation coefficient was 0.131 5.In addition,the wind speed and transport of ACC of 6 months later showed a weakly negative correlation,and the correlation coefficient was 0.133 3.It reveals that with the increase of direct input of wind driving force,the transport of ACC initially grows up.However,the increasing wind speed will also result in the EKE’s growth,and the EKE will dissipate the kinetic energy brought by wind,and then the transport of ACC will decrease,which will help keep the transport’s trend of ACC stable.
作者
范秀梅
樊伟
伍玉梅
杨胜龙
周为峰
FAN Xiu-mei;FAN Wei;WU Yu-mei;YANG Sheng-long;ZHOU Wei-feng(Key Laboratory of Oceanic and Polar Fisheries,Ministry of Agriculture and Rural Affairs,East China SeaFisheries Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200090,China)
出处
《渔业信息与战略》
2019年第3期199-205,共7页
Fishery Information & Strategy
基金
中央级公益性科研院所基本科研业务费专项资金(2015T06)
关键词
流量
风场
绕极流
中尺度涡
transport
wind field
Antarctic Circumpolar Current
mesoscale eddy
