| SHI Wenqi,ZHAO Jinping,LIAN Xihu,WANG Xiaoyu,CHEN Weibin. 2017. Slowdown of sea surface height rises in the Nordic seas and related mechanisms. Acta Oceanologica Sinica, 36(8):20－33 |
| Slowdown of sea surface height rises in the Nordic seas and related mechanisms |
| 北欧海海面高度上升减缓及其机理研究 |
| Received:March 31, 2016 |
| DOI：10.1007/s13131-017-1027-x |
| Key words:Nordic seas sea surface height steric height slowdown in sea level rises |
| 中文关键词: 北欧海 海面高度 比容高度 上升减缓 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41330960; the National Major Scientific Research Program on Global Changes under contract No. 2015CB953900. |
| Author Name | Affiliation | E-mail | | SHI Wenqi | School of Marine Environment, Ocean University of China, Qingdao 266100, China
National Marine Environmental Monitoring Center, Dalian 116023, China | swqouc@163.com | | ZHAO Jinping | School of Marine Environment, Ocean University of China, Qingdao 266100, China | | | LIAN Xihu | Numerical Simulation Laboratory, North China Sea Marine Forecasting Center, Qingdao 11600, China | | | WANG Xiaoyu | School of Marine Environment, Ocean University of China, Qingdao 266100, China | | | CHEN Weibin | National Marine Environmental Monitoring Center, Dalian 116023, China | |
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| Abstract: |
| A slowdown of sea surface height (SSH) rise occurred in the Nordic (GIN) seas around 2004. In this study, SSH satellite data and constructed steric height data for the decades before and after 2004 (i.e., May 1994 to April 2014) were used for comparative analysis. The findings indicate that the rate of slowdown of SSH rises in the GIN seas (3.0 mm/a) far exceeded that of the global mean (0.6 mm/a). In particular, the mean steric height of the GIN seas increased at a rate of 4.5 mm/a and then decreased at a slower pace. This was the main factor responsible for the stagnation of the SSH rises, while the mass factor only increased slightly. The Norwegian Sea particularly experienced the most prominent slowdown in SSH rises, mainly due to decreased warming of the 0-600 m layer. The controlling factors of this decreased warming were cessation in the increase of volume of the Atlantic inflow and stagnation of warming of the inflow. However, variations in air-sea thermal flux were not a major factor. In the recent two decades, mean halosteric components of the GIN seas decreased steadily and remained at a rate of 2 mm/a or more because of increased flow and salinity of the Atlantic inflow during the first decade, and reduction in freshwater inputs from the Arctic Ocean in the second decade. |
| 中文摘要: |
| 北欧海海平面上升减缓发生在2004年左右。本文通过将1994年5月到2014年4月的海面高度卫星数据、构建的比容高度数据在2004年前后两个十年之间的对比分析，得出北欧海海面高度升速降幅（3.0mm/yr）远大于全球平均水平（0.6mm/yr）。其中北欧海平均比容高度由上升变为下降，升速降幅更大（4.5mm/yr），为造成海面高度上升停滞的主要部分；而质量部分升速略微增加。挪威海是北欧海海面高度上升减缓突出区域，其海面高度上升减缓主要是由于0~600m层升温停滞导致的。大西洋入流流量增加停止及入流水升温停滞是引起挪威海上层升温停滞的控制因素，而海气热通量变化并非主要因素。近20年，北欧海平均盐度部分保持2mm/yr以上的稳定下降，前十年为大西洋入流流量、盐度增加的结果，后十年由北冰洋淡水输入减少造成的。 |
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