北太平洋地下低位涡水撞击黑潮的直接观测

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2025-01-08 DOI:10.1029/2024GL113152

Ran Wang, Qiang Ren, Feng Nan, Fei Yu, Zifei Chen, Yansong Liu, Jianfeng Wang, Chuanzheng Zhang, Ruixiang Zhao, Hua Zheng, Xiaohua Zhu

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摘要

在这项研究中，我们首次通过由12个电流和压力记录反向回声测深仪（CPIESs）组成的阵列，在2018年6月25日至2019年7月29日期间，在台湾岛东部（122°$\mathit{{}}^{\circ}}$ -124°E${}}\ circ}\text{E}$, 21.67°$\mathit{{}}^{\circ}}$ -23°N$\mathit{{}}^{\circ}}\text{N}$）发现了一个地下低电位涡水（SLPVW）。这一SLPVW表现出显著的季节变异，在台湾岛以东约100天的周期，与中尺度涡旋的变异相对应。与大尺度气候平均环流相比，中尺度涡旋可以作为向西输送的高速公路来捕获SLPVW。此外，SLPVW撞击导致200-400 m层的地下速度变化显著（约10 cm/s）。这些发现为黑潮次表层季节内变化的机制提供了新的线索。

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Direct Observations of North Pacific Subsurface Low Potential Vorticity Water Impinging on the Kuroshio

In this study, for the first time, we found a Subsurface Low Potential Vorticity Water (SLPVW) to the east of Taiwan Island (122 $°$ –124 $° E$ , 21.67 $°$ –23 $° N$ ) via an array comprising 12 current and pressure-recording inverted echo sounders (CPIESs) from 25 June 2018 to 29 July 2019. This SLPVW exhibits remarkable intraseasonal variability, with an ∼100-day period east of Taiwan Island, corresponding with the variability in mesoscale eddies. Compared with large-scale climatological mean circulation, mesoscale eddy can trap SLPVW as a highway westward transport. In addition, the SLPVW impingement results in a significant subsurface velocity variation (about 10 cm/s) in the 200–400 m layer. These findings shed new light on the mechanisms of the intraseasonal variation in the Kuroshio subsurface layer.

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.