| 黑潮延伸体区域50-100公里涡旋分布特征 |
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| 引用本文： | 钱思佳,于方杰,陈戈.黑潮延伸体区域50-100公里涡旋分布特征[J].海洋科学,2021,45(11). |
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| 作者姓名： | 钱思佳 于方杰 陈戈 |
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| 作者单位： | 中国海洋大学,中国海洋大学,中国海洋大学 |
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| 摘 要： | 本文使用基于热成风速度的涡旋识别拓展方法，通过海表面温度数据对黑潮延伸体区域50-100公里涡旋进行研究，发现50-100公里涡旋主要分布在黑潮延伸体流轴两侧，气旋涡和反气旋涡的寿命、半径分布具有一致性。气旋涡多出现在35°N以北，反气旋涡在35°N以南比较集中，与尺度较小的中尺度涡旋分布特征较为相似。冬夏两季涡旋地理分布存在一定差异，主要与不同季节该区域海表温度梯度及风应力旋度的变化有关。35°N以南50-100公里涡旋数量的季节性变化与风速大小的季节性变化存在明显的正相关性。35°N以南50-100公里涡旋三倍半径内风速异常和风应力旋度归一化表明，气旋涡对应风速负异常而反气旋涡对应风速正异常，反气旋涡的产生依赖于风应力负旋度，气旋涡的生成与风应力正旋度有关。
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| 关 键 词： | 黑潮延伸体 50-100公里涡旋 海表面温度 涡旋识别拓展方法 涡旋-风速 |
| 收稿时间： | 2020/12/14 0:00:00 |
| 修稿时间： | 2021/3/8 0:00:00 |
Distribution characteristics of eddies with scale of 50-100 km in Kuroshio Extension Region |
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| Qian Siji,Yu Fangjie and Chen Ge.Distribution characteristics of eddies with scale of 50-100 km in Kuroshio Extension Region[J].Marine Sciences,2021,45(11). |
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| Authors: | Qian Siji Yu Fangjie and Chen Ge |
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| Institution: | Ocean University of China,Ocean University of China,Ocean University of China |
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| Abstract: | In this paper, high resolution sea surface temperature (SST) and an extended eddy detection algorithm based on thermal-wind velocity were used to study the characteristics of eddies with scale of 50-100 km in Kuroshio Extension region. The results show that eddies with scale of 50-100 km are mainly distributed on both sides of Kuroshio Extension. The lifetime and radius distribution of cyclonic eddies (CEs) and anticyclonic eddies (AEs) is consistent. CEs are mostly distributed in the north of 35°N while AEs are more concentrated in the south of 35°N, which is similar to the distribution characteristic of mesoscale eddies with small scale. There is a slight difference in eddy distribution characteristics in winter and summer, which is mainly related to the difference in SST horizontal gradient and wind stress curl in different seasons. The seasonal variation of the number of CEs and AEs in the south of 35°N is positively correlated with the seasonal variation of wind speed. The normalization of wind speed anomaly and wind stress curl within three times the radius of eddies with scale of 50-100 km in south of 35°N shows that AEs correspond to the positive anomaly of wind speed while CEs correspond to negative wind speed anomaly. The generation of AEs is caused by the negative curl of wind stress and the generation of CEs is related to the positive curl of wind stress. |
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| Keywords: | Kuroshio Extension eddy with scale of 50-100 km sea surface temperature extended eddy detection algorithm eddy-wind speed |
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