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Climate drivers of directional wave power on the Mexican coast

机译：墨西哥海岸定向波力的气候司机

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摘要

Ocean waves are the main driver of sediment transport on open sandy coastlines, and inter-annual to multi-decadal variability in the wave climate significantly impacts year-on-year coastal risk. As such, the integration of large-scale climatic variability into local-scale coastal management studies is pertinent but seldom implemented in practice, mainly due to the lack of knowledge in this subject as is the case of Mexico. This knowledge gap is addressed here by quantifying the seasonal to long-term variability of the wave climate along the coasts of Mexico. The influence of large-scale climate drivers on this variability is also characterized. To do this, we identify monthly-averaged directional wave power signatures of the Mexican coast at a 0.5° resolution pertaining to a range of climate indices, using a newly available climate reanalysis product (ERA5) and a statistical-based global wave climate classification method. The wave climate of the Mexican Pacific coast is strongly bi-directional with considerable seasonal variability and high sensitivity to pan-hemispheric climate variability in the Pacific. Conversely, the wave climate of the Mexican Caribbean coast is more homogenous year-round, having its origins in the tropical Atlantic. Results show that El Nino effects break down the bi-directionality of the Mexican Pacific wave climate, leading to a more uni-directional, shore-normal, and more energetic nearshore wave power climate, compared with ENSO-neutral periods. Additionally, the wave power response to individual ENSO events can be either amplified or dampened depending on the underlying phase of the multi-decadal PDO.
机译：海浪是开放式桑迪海岸线的沉积物运输的主要驱动因素，并且在波浪气候中的年度跨年代变异性显着影响了同比沿海风险。因此，将大规模气候变化的整合到局部规模的沿海管理研究中是相关的，但很少在实践中实施，主要是由于墨西哥的情况缺乏这个主题的知识。通过量化季节性对墨西哥海岸的波浪气候的长期变异性来解决这种知识差距。大规模气候司机对这种变异性的影响也表现为特征。为此，我们使用新可用的气候重新分析产品（ERA5）和基于统计的全球波浪气候分类方法，确定墨西哥海岸的每月平均定向波功率签名，墨西哥海岸的0.5°分辨率，以及基于统计的全球波气候分类方法。墨西哥太平洋海岸的波浪气候对于太平洋的泛环气候变异性具有相当大的季节性变化和高敏感性。相反，墨西哥加勒比海岸的波浪气候全年更加均匀，在热带大西洋中起源。结果表明，埃尔尼诺效应分解了墨西哥太平洋波浪气候的双向性，导致更单向，岸正常，更有活力的近岸波浪动力气候，与Enso-中立时期相比。另外，对单个ENSO事件的波功率响应可以根据多码PDO的底层相位来放大或抑制。

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  • 来源
    《Ocean Dynamics》 |2020年第9期|1253-1265|共13页
  • 作者

    Itxaso Oderiz; Rodolfo Silva; Thomas R. Mortlock; Edgar Mendoza;

  • 作者单位

    Instituto de Ingenieria Universidad Autonoma de Mexico (Grupo de Ingenieria de Costas y Puertos) Ciudad de Mexico Mexico;

    Instituto de Ingenieria Universidad Autonoma de Mexico (Grupo de Ingenieria de Costas y Puertos) Ciudad de Mexico Mexico;

    Risk Frontiers Sydney Australia Department of Earth and Environmental Sciences Macquarie University Sydney Australia;

    Instituto de Ingenieria Universidad Autonoma de Mexico (Grupo de Ingenieria de Costas y Puertos) Ciudad de Mexico Mexico;

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  • 正文语种 eng
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  • 关键词

    Keywords Wave climate; ENSO; PDO; AMO; Mexico;

    机译：关键词波气候;enso;PDO;amo;墨西哥;

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