基于沿东经 138 度反复勘测的 2017 年黑潮大蜿蜒的时间变化

IF 1.3 4区 地球科学 Q4 OCEANOGRAPHY
Daiki Ito, Yugo Shimizu, Takashi Setou, Akira Kusaka, Daisuke Ambe, Yutaka Hiroe, Kiyotaka Hidaka, Sayaka Sogawa, Tamaha Yamaguchi
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引用次数: 0

摘要

2017 年 8 月,黑潮开始沿着其大蜿蜒(LM)路径移动,这距离上一次 LM 事件已经过去了 12 年。这种 LM 事件导致在黑潮和日本南部海岸之间的黑潮近岸区域内形成近岸气旋漩涡(ICE)。我们分析了沿东经 138 度横断面反复进行的季节性调查数据,以及其他调查、卫星观测、Argo 浮漂和高分辨率再分析数据集的数据,以描述 2017 年至 2021 年期间 LM 和 ICE 的时间变化。重复勘测的横截面突显了水团结构的变化。ICE强度指标的时间序列,如ICE中的黑潮体积输送和行星贡献的潜在涡度(Q),显示了其强度在观测期间的维持趋势。与非 LM 期间相比,高 Q 值水在 LM 期间分布在 ICE 中,并在较浅层中表现出明显的季节性,表明 Q 值在夏季通过上游地区的平流注入。额外的勘测捕捉到了 2020 年夏季脱离 ICE 的漩涡。该脱离漩涡的 Q 值大于 ICE,流速与黑潮相似,表明主流暂时脱离。此外,还研究了暖水侵入近岸区域的结构和体积传输,并认为离心不稳定性是其产生机制之一。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Temporal variation of the 2017 Kuroshio large meander based on repeated surveys along 138°E

Temporal variation of the 2017 Kuroshio large meander based on repeated surveys along 138°E

During August 2017, the Kuroshio began to follow its large meander (LM) path, and this was 12 years after the last LM event. Such LM events lead to the formation of an inshore cyclonic eddy (ICE) within the Kuroshio inshore region between the Kuroshio and the southern coast of Japan. We analyzed data from repeated seasonal surveys along a transect that followed 138°E, and from additional surveys, satellite observations, Argo floats, and a high-resolution reanalysis dataset to describe the temporal variation of the LM and ICE between 2017 and 2021. Cross sections from the repeated surveys highlighted the variations in the water mass structures. The time series of the indicators of the ICE intensity such as the Kuroshio volume transport and the planetary contribution of potential vorticity (Q) in the ICE revealed a maintenance trend in their intensity during the observation period. High-Q water was distributed in the ICE during the LM period compared to the non-LM period, and showed a clear seasonality within the shallower layers, suggesting the injection of Q via the advection from the upstream region in summer. Additional surveys captured an eddy that became detached from the ICE during summer 2020. This detached eddy had a Q value greater than the ICE and velocity similar to the Kuroshio, suggesting that the main stream had become temporarily separated. The structures and volume transport of warm water intrusions into the inshore region were also examined, and centrifugal instability was considered to be one of their generation mechanism.

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来源期刊
Journal of Oceanography
Journal of Oceanography 地学-海洋学
CiteScore
3.50
自引率
13.00%
发文量
42
审稿时长
6-12 weeks
期刊介绍: The Journal of Oceanography is the official journal of the Oceanographic Society of Japan and open to all oceanographers in the world. The main aim of the journal is to promote understandings of ocean systems from various aspects including physical, chemical, biological, geological oceanography as well as paleoceanography, etc. The journal welcomes research focusing on the western North Pacific and Asian coastal waters, but the study region is not limited to the Asian Pacific. The journal publishes original articles, short contributions, reviews, and correspondence in oceanography and related fields.
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