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SIMULATION AND ANALYSIS OF HURRICANE-DRIVEN EXTREME WAVE CLIMATE UNDER TWO OCEAN WARMING SCENARIOS

机译:两种海洋变暖条件下飓风驱动的极端波气候的模拟与分析

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摘要

Ocean wave climate is an important area of research, particularly in the context of extremes driven by tropical cyclones (TC). We can now simulate global climate at resolutions sufficient to resolve TCs and for durations long enough to explore climatological changes. Both the devastating 2017 North Atlantic hurricane season and growing evidence for the connection between TC activity and increasing ocean temperature motivate investigation of possible future changes. We present two simulated 50-year global wave climate data sets under possible future warming scenarios characterized by +1.5 degrees C and +2.0 degrees C stabilized global mean temperatures that capture the effects of TCs. Differences in extreme wave climate between these possible scenarios and present-day conditions appear to be significant in many areas, particularly those affected by TCs. However, for computational feasibility, simulations of this kind rely on fixed sea surface temperatures, so we also investigate and elucidate effects from the lack of a dynamic ocean by simulating waves from a number of recent hurricanes and comparing output to observations. We conclude that atmosphere-only forcing is likely to result in an overestimate of extreme wind speeds and wave heights in TC-affected regions. More ensemble studies are needed to help elucidate detailed processes relevant to extreme wave climate, and important community projects such as the Coordinated Wave Climate Intercomparison Project (COWCLIP) should be supported.
机译:海浪气候是一个重要的研究领域,特别是在热带气旋(TC)驱动的极端情况下。现在,我们可以以足以解析TC的分辨率和足够长的时间来探索气候变化的分辨率来模拟全球气候。无论是毁灭性的2017年北大西洋飓风季节,还是越来越多的证据表明TC活动与海洋温度升高之间的联系,都促使人们对未来可能发生的变化进行调查。我们在未来可能出现的变暖情景下,提供了两个模拟的50年全球海浪气候数据集,其特征为+1.5摄氏度和+2.0摄氏度的稳定的全球平均温度,它们捕获了TC的影响。在许多地区,特别是受热带气旋影响的地区,这些可能的情景和当今状况之间的极端波浪气候差异似乎很明显。但是,出于计算可行性,此类模拟依赖于固定的海面温度,因此,我们还通过模拟许多近期飓风的波并将输出与观测值进行比较,来研究和阐明缺乏动态海洋的影响。我们得出的结论是,仅大气强迫可能会导致受TC影响的地区的极端风速和波高过高。需要进行更多的合奏研究以帮助阐明与极端海浪气候有关的详细过程,并且应该支持重要的社区项目,例如协调海浪气候比对项目(COWCLIP)。

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  • 来源
    《Oceanography》 |2018年第2期|88-99|共12页
  • 作者单位

    Lawrence Berkeley Natl Lab, Climate & Ecosyst Sci Div, Berkeley, CA 94720 USA;

    Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA USA;

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  • 正文语种 eng
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