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Understanding the impact of climate change on the oceanic circulation in the Chilean island ecoregions
Aquatic Conservation: Marine and Freshwater Ecosystems ( IF 2.4 ) Pub Date : 2021-01-28 , DOI: 10.1002/aqc.3506
Boris Dewitte 1, 2, 3, 4 , Carlos Conejero 4 , Marcel Ramos 2, 3, 5 , Luis Bravo 2, 3 , Véronique Garçon 4 , Carolina Parada 6, 7 , Javier Sellanes 2, 3 , Ariadna Mecho 3, 8 , Praxedes Muñoz 2, 3 , Carlos F. Gaymer 2, 3
Affiliation  

  1. The largest changes in the circulation of the South‐eastern Pacific resulting from global warming are associated with the southward shift and intensification of the anticyclone and with coastal surface warming. Coastal upwelling is projected to be increase off central Chile, due to an increase in equatorward winds, although increased oceanic stratification and associated enhanced nearshore turbulence will yield an onshore deepening/flattening of the thermocline.
  2. The overall increase in south‐easterly trade winds of the South‐eastern Pacific in a warmer climate are likely to increase the connectivity pattern between Juan Fernandez and Desventuradas islands, and along the Sala y Gomez ridge, through increasing wind‐driven mean ocean currents.
  3. Deoxygenation associated with the warmer temperatures and changes in ventilation are likely to modify marine habitat and the respiratory barriers of species in the seamounts located in the vicinity of the limits of the minimum oxygen zone.
  4. In the South‐eastern Pacific, the prevailing 2D understanding of the responses of marine life to climate change needs to be expanded to 3D approaches, integrating the vertical habitat compression of marine organisms as a result of ocean warming and deoxygenation, as climate velocities for temperature and oxygen have contrasting vertical and horizontal patterns.
  5. There is a need for regional biogeochemical‐coupled modelling studies dedicated to the Chilean islands in order to provide an integrated view of the impact of anthropogenic stressors (e.g. deoxygenation, increased stratification, and climate shift) at the scale required for addressing socio‐ecological interactions.
  6. A refined understanding of the large‐scale biogeography and spatial dynamics of marine populations through experimentation with high‐resolution regional ocean models is a prerequisite for scaling‐up regional management planning and optimizing the conservation of interconnected marine ecosystems across large scales.


中文翻译:

了解气候变化对智利岛屿生态区海洋循环的影响

  1. 全球变暖导致东南太平洋环流的最大变化与反气旋的南移和加剧以及沿海表面变暖有关。由于赤道风的增加,预计智利中部沿海地区的上升流将增加,尽管海洋分层的增加和相关近岸湍流的增强将使温跃层在陆地上加深/展平。
  2. 在气候变暖的情况下,东南太平洋东南风的整体增加可能会通过增加风力驱动的平均洋流来增加胡安·费尔南德斯和德斯文图拉达斯群岛之间以及沿萨拉·戈麦斯海岭的连通性。
  3. 与温度升高和通风变化相关的脱氧可能会改变海洋栖息地和位于最低氧区界限附近的海山中物种的呼吸屏障。
  4. 在东南太平洋,需要将对海洋生物对气候变化的响应的主流2D理解扩展到3D方法,将海洋变暖和海洋脱氧导致的海洋生物垂直生境压缩与温度的气候变化速度结合起来和氧气具有相反的垂直和水平模式。
  5. 需要针对智利岛屿进行区域生物地球化学耦合建模研究,以便以解决社会生态相互作用所需的规模提供人为压力源(例如脱氧,分层增加和气候变化)影响的综合视图。 。
  6. 通过试验高分辨率区域海洋模型,对海洋生物的大规模生物地理学和空间动力学有一个精深的了解,这是扩大区域管理规划和优化大规模互连海洋生态系统养护的前提。
更新日期:2021-02-25
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