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Microseismological evidence for a changing wave climate in the northeast Atlantic Ocean

机译:东北大西洋波浪气候变化的微地震证据

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摘要

One possible consequence of a change in climate over the past several decades is an increase in wave heights, potentially threatening coastal areas as well as the marine industry. But the difficulties in observing wave heights exacerbates a general problem of climate-change detection: inhomogeneities in long-term observational records owing to changes in the instruments or techniques used, which may cause artificial trends. Ground movements with periods of 4-16 seconds, known as microseisms, are associated with ocean waves and coastal surf, and have been recorded continuously since the early days of seismology. Here we use such a 40-year record of wintertime microseisms from Hamburg, Germany, to reconstruct the wave climate in the northeast Atlantic Ocean. For the period 1954-77, we detect an average of seven days per month with strong microseismic activity, without a significant trend. This number increases significantly in the second half of the record, reaching approximately 14 days of strong microseisms per month. The implied increase in northeast Atlantic wave height over the past 20 years parallels increased surface air temperatures and storminess in this region, suggesting a common forcing.
机译:在过去的几十年中,气候变化的一个可能后果是波高增加,可能威胁沿海地区以及海洋工业。但是,观测波高的困难加剧了气候变化检测的一个普遍问题:由于所使用的仪器或技术的变化,长期观测记录的不均匀性可能导致人为趋势。周期为4至16秒的地面运动(称为微震)与海浪和沿海冲浪有关,自地震学问世以来就不断记录下来。在这里,我们利用德国汉堡这样的40年冬季微震记录来重建东北大西洋的波浪气候。在1954-77年期间,我们每月平均检测到7天的微地震活动很强,而没有明显的趋势。该数字在记录的后半段显着增加,每月达到约14天的强烈微震。在过去的20年中,东北大西洋海浪高度的隐含增加与该地区地表气温的升高和暴风雨的增加平行,这表明存在共同的强迫作用。

著录项

  • 来源
    《Nature》 |2000年第6810期|p.349-352|共4页
  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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