基于卫星测高资料的班达海海平面季节及年际变化研究

发布时间：2018-05-11 09:20

本文选题：班达海 + 海面高度　；参考：《海洋与湖沼》2016年04期

【摘要】：本文基于法国空间局AVISO提供的格点化绝对动力地形(MADT:maps of absolute dynamic topography)资料,分析了1993年1月—2013年12月班达海(Banda Sea)海平面的季节和年际变化特征。班达海海面高度的季节变化主要表现为12月到翌年4月西北季风盛行时较高,7月到10月东南季风盛行时较低,全年变化幅度为16.5cm;班达海东部近阿拉弗拉海(Arafuru Sea)与西南部近弗洛勒斯海(Flores Sea)海平面随季风转换表现出"跷跷板"形态。海平面的变化受比容海平面变化和海水质量变化共同调制,其中比容海面高度季节变化振幅为14cm左右,约占海平面变化的84%,并且班达海比容海平面的季节性空间分布与总体海平面具有明显的一致性,因此比容海平面的变化是造成班达海海平面季节变化的主要原因;而风生Ekman流引起的海水堆积会影响班达海东北部的海平面高度。年际尺度上,班达海海平面与ENSO事件密切相关,月平均海面高度异常EOF分解第一模态方差贡献率高达96%,第一模态时间序列(PC1)滞后Ni?o3.4指数1个月左右时相关系数达到 0.76,远超过95%置信度水平;相比之下,IOD事件对班达海海平面的影响较小,PC1与印度洋偶极子指数(DMI)之间的最大相关系数仅为 0.3,低于95%置信度水平。并且月平均比容海平面异常和动力地形异常之间的差异在ENSO事件期间显著增大,表明ENSO事件引起的平流输送在班达海海平面高度年际变化中起到重要作用。
[Abstract]:In this paper, the seasonal and interannual variation characteristics of sea level in Banda Sea (Banda Sea) from January 1993 to December 2013 are analyzed on the basis of the data provided by the French Space Agency (AVISO). The seasonal variation of sea surface height in Banda Sea mainly shows that the northwest monsoon is high from December to April, and the southeast monsoon is lower from July to October. The annual variation range is 16.5 cm, and the sea level of the eastern Banda Sea near Arafuru Seaand the southwestern Flores Sea (near Flores Sea) shows a "seesaw" pattern with the monsoon transition. The variation of sea level is modulated by the variation of specific volume sea level and sea water quality, in which the seasonal variation amplitude of specific volume sea surface height is about 14cm. The seasonal spatial distribution of the sea level in the Banda Sea is obviously consistent with that of the total sea level, so the change of the specific volume sea level is the main reason for the seasonal variation of the sea level in the Banda Sea. The accumulation of sea water caused by wind-induced Ekman currents will affect the sea level in the northeast of the Banda Sea. On an interannual scale, the sea level of the Banda Sea is closely related to ENSO events. The contribution rate of the first mode variance of the EOF decomposition of the monthly mean sea surface height anomaly is as high as 96, and the correlation coefficient of the Ni?o3.4 index of the first mode time series is 0.76 when the first mode time series is delayed for about one month, which far exceeds the confidence level of 95%. In contrast, the maximum correlation coefficient between IOD events and the Indian Ocean dipole index (DMI) is only 0.3, which is below the 95% confidence level. The difference between the monthly mean specific volume sea level anomaly and the dynamic topographic anomaly increases significantly during the ENSO event, indicating that the advection transport caused by the ENSO event plays an important role in the interannual variation of sea level height in the Banda Sea.
【作者单位】：国家海洋局第一海洋研究所;海洋国家实验室区域海洋动力学与数值模拟功能实验室;
【基金】：国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目,U1406404号国家自然科学基金项目,41476025号,41306031号 “全球变化与海气相互作用”专项项目,GASI-03-01-01-04号,GASI-IPOVAI-01-02号
【分类号】：P715.6;P731.23

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