Recent warming of the Kuroshio Current has promoted offshore sediment transport in the Yellow Sea

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-04-18 DOI:10.1002/lol2.10396
Yong Shi, Xiaomei Xu, Tao Liu, Guang Yang, Shengjing Liu, Jixuan Lyu, Shuo Zhang, Hui Sheng, Jianhua Gao
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Abstract

As cross-shelf gradients of most properties are typically much steeper than those in the alongshore direction, transport across isobaths tends to be inhibited, particularly at oceanic fronts where cross-shelf gradients are markedly pronounced. Consequently, variations in cross-shelf gradients may exert a significant influence on offshore transport; however, this influence is not yet well understood. This study employs reconstructed daily suspended sediment concentration (SSC) data from the Yellow Sea's offshore region to investigate the dynamics of offshore transport. Our analysis on an interannual scale shows that offshore SSC correlates more with temperature gradients at the oceanic front than with winter storms, despite the latter's vital role in causing frontal instability. The observed increase in offshore transport over the past two decades is likely connected to Kuroshio Current warming, which has strengthened the horizontal density gradient at the oceanic front, driving the strengthened offshore transport of coastal sediments during instability episodes.

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黑潮最近的变暖促进了黄海的近海沉积物迁移
由于大多数特性的跨大陆架梯度通常比沿岸方向的梯度陡峭得多,跨等深线的输运往往受到抑制,特别是在跨大陆架梯度明显的大洋前沿。因此,跨岸梯度的变化可能会对近海迁移产生重大影响;然而,人们对这种影响还不甚了解。本研究利用黄海近海区域重建的日悬浮泥沙浓度(SSC)数据来研究近海输运的动态变化。我们在年际尺度上的分析表明,近海悬浮泥沙浓度与海洋锋面温度梯度的相关性大于与冬季风暴的相关性,尽管后者在造成锋面不稳定方面起着至关重要的作用。在过去 20 年中观测到的离岸迁移量的增加可能与黑潮增温有关,黑潮增温加强了大洋前沿的水平密度梯度,从而在不稳定事件发生时推动了沿岸沉积物离岸迁移量的增加。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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