| SUN Ruili,GAO Guoping. 2018. Impact of polar lows on synoptic scale variability of Atlantic inflow in the Fram Strait. Acta Oceanologica Sinica, 37(3):42－50 |
| Impact of polar lows on synoptic scale variability of Atlantic inflow in the Fram Strait |
| 极地低压对费拉姆海峡大西洋入流水天气尺度变化的影响 |
| Received:May 18, 2017 |
| DOI：10.1007/s13131-018-1199-z |
| Key words:Fram Strait Atlantic inflow synoptic scale variability polar lows |
| 中文关键词: 费拉姆海峡 大西洋入流水 天气尺度变化 极地低压 |
| 基金项目:The Global Change Research Program of China under contract No. 2015CB953900; the General Program of National Natural Science Foundation of China under contract No. 41276197; the Natural Science Foundation of Zhejiang Province under contract Nos LY18D060004 and LQ18D060001; the Foundation of Zhejiang Education Department under contract No. 1260KZ0417982; the Talent Start Foundation of Zhejiang Gongshang University under contract Nos 1260XJ2317015 and 1260XJ2117015. |
| Author Name | Affiliation | E-mail | | SUN Ruili | College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China | | | GAO Guoping | College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China | gpgao@shou.edu.cn |
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| Abstract: |
| The Atlantic inflow in the Fram Strait (78°50'N) has synoptic scale variability based on an array of moorings over the period of 1998-2010. The synoptic scale variability of Atlantic inflow, whose significant cycle is 3-16 d, occurs mainly in winter and spring (from January to April) and is related with polar lows in the Barents Sea. On the synoptic scale, the enhancement (weakening) of Atlantic inflow in the Fram Strait is accompanied by less (more) polar lows in the Barents Sea. Wind stress curl induced by polar lows in the Barents Sea causes Ekman-transport, leads to decrease of sea surface height in the Barents Sea, due to geostrophic adjustment, further induces a cyclonic circulation anomaly around the Barents Sea, and causes the weakening of the Atlantic inflow in the Fram Strait. Our results highlight the importance of polar lows in forcing the Atlantic inflow in the Fram Strait and can help us to further understand the effect of Atlantic warm water on the change of the Arctic Ocean. |
| 中文摘要: |
| 基于1998-2010年期间的锚系浮标数据，费拉姆海峡（78°50'N）大西洋入流水有天气尺度变化。大西洋入流水天气尺度变化主要发生在冬春季节（此处指的是从1月到4月），其显著周期为3-16天，这与巴伦支海处的极地低压有关。在天气尺度上，费拉姆海峡处大西洋入流水的增强（减弱）伴随着巴伦支海极地低压个数的异常减少（增加）。巴伦支海处的极地低压引起的风应力旋度导致Ekman输运，引起巴伦支海海表面高度降低，进一步在巴伦支海周围引起一气旋式环流，然后导致费拉姆海峡处大西洋入流水的减弱。我们的结果突出了极地低压在驱动费拉姆海峡处大西洋入流水的重要性，进而有利于人们加深对大西洋暖水影响北冰洋变化的理解。 |
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