| Yu Peilong,Zhang Lifeng,Liu Mingyang,Zhong Quanjia,Zhang Yongchui,Li Xin. 2020. A comparison of the strength and position variability of the Kuroshio Extension SST front. Acta Oceanologica Sinica, 42(5):26－34 |
| A comparison of the strength and position variability of the Kuroshio Extension SST front |
| 黑潮延伸体海洋锋强度和位置变率的对比研究 |
| Received:February 11, 2019 |
| DOI：10.1007/s13131-020-1567-3 |
| Key words:sea surface temperature Kuroshio Extension front North Pacific Oscillation-like atmospheric forcing oceanic Rossby waves |
| 中文关键词: 海表温度 黑潮延伸体海洋锋（KEF） 北太平洋涛动型大气强迫 海洋Rossby波 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | Yu Peilong | College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | | | Zhang Lifeng | College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | zhanglif_qxxy@sina.cn | | Liu Mingyang | No. 91939 Troops of PLA, Jiangmen 529100, China | | | Zhong Quanjia | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physic, Chinese Academy of Sciences, Beijing 100029, China
College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China | | | Zhang Yongchui | College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | | | Li Xin | College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | |
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| Abstract: |
| This study compares the seasonal and interannual-to-decadal variability in the strength and position of the Kuroshio Extension front (KEF) using high-resolution satellite-derived sea surface temperature (SST) and sea surface height (SSH) data. Results show that the KEF strength has an obvious seasonal variation that is similar at different longitudes, with a stronger (weaker) KEF during the cold (warm) season. However, the seasonal variation in the KEF position is relatively weak and varies with longitude. In contrast, the low-frequency variation of the KEF position is more distinct than that of the KEF strength even though they are well correlated. On both seasonal and interannual-to-decadal time scales, the western part of the KEF (142°-144°E) has the greatest variability in strength, while the eastern part of the KEF (149°-155°E) has the greatest variability in position. In addition, the relationships between wind-forced Rossby waves and the low-frequency variability in the KEF strength and position are also discussed by using the statistical analysis methods and a wind-driven hindcast model. A positive (negative) North Pacific Oscillation (NPO)-like atmospheric forcing generates positive (negative) SSH anomalies over the central North Pacific. These oceanic signals then propagate westward as Rossby waves, reaching the KE region about three years later, favoring a strengthened (weakened) and northward (southward)-moving KEF. |
| 中文摘要: |
| 本文利用卫星观测的高分辨率海表温度和海表高度资料，对黑潮延伸体海洋锋（KEF）强度和位置的季节和年际-年代际变率进行了对比研究。结果表明，不同经度位置上的海洋锋强度有着类似的季节变化，在冷季较强，在暖季较弱。然而，不同经度上的海洋锋位置季节变化呈现出明显的差异，并且振幅较弱。KEF强度和位置的低频变化间有着较好的相关性，但强度的变化振幅弱于位置。在季节和年际-年代际时间尺度上，KEF的西部（142°–144°E）都呈现出最强的强度变率，而KEF东部（149°–155°E）则有着最强的位置变率。此外，本文还对风生海洋Rossby波，KEF强度和位置的低频变化间的关系进行了讨论，发现正（负）位相的北太平洋涛动型大气强迫在中北太平洋引起了海表高度正（负）异常。这些海洋异常信号会以Rossby波的形式在3年后西传至黑潮延伸体区，引起KEF的变强（弱）和北（南）移。 |
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