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人为变暖对大西洋强烈风频率的模拟影响
Morris A Bender1, Thomas R Knutson, Robert E Tuleya
1National Oceanic and Atmospheric Administration/Geophysical Fluid Dynamics Laboratory, 201 Forrestal Road, Princeton, NJ 08540, USA. Morris.Bender@noaa.gov
概括
全球变暖可能会减少大西洋热带气旋的频率,但会增加主要风的强度. 预测显示,到2100年,4级和5级风暴的数量将几乎翻一番,特别是在大西洋西部.
科学领域:
- 气候科学 气候科学
- 气象学 天气学
- 海洋学 海洋学 海洋学
背景情况:
- 现有的气候模型预测,由于全球变暖,大西洋热带气旋频率可能会下降.
- 然而,这些模型很难准确地模拟主要风的强度 (3类及以上).
研究的目的:
- 通过使用高分辨率预测模型,研究未来全球变暖对大西洋风强度的影响.
- 解决当前模型在重现严重风事件方面的局限性.
主要方法:
- 采用了使用操作风预测模型的缩小规模策略.
- 该模型被验证为其现实模拟当今强烈风活动的能力.
- 使用了18个全球气候变化预测的整体平均值作为缩小规模的输入.
主要成果:
- 预计到21世纪末,大西洋4级和5级风的频率将近翻一番.
- 尽管强烈风暴的增加,热带气旋的总体频率预计将下降.
- 强烈风活动最显著的增加预计在西大西洋地区,北20度以北.
结论:
- 未来的全球变暖可能会导致更强烈的大西洋风,即使整体风暴频率下降.
- 西大西洋在气候变暖的情况下,可能面临严重风事件的风险增加.
- 先进的风预测模型对于了解气候变化对极端天气事件的微妙影响至关重要.
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