大气中CO2的升高导致了热带气旋强度的增加,在早期的Toarcian超热时期,热带气旋强度增加
Qing Yan1,2, Xiang Li3, David B Kemp4
1Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
概括
在早期的托尔西亚热带期间,二氧化碳水平的增加导致了泰提斯海洋中更强烈的热带气旋 (TC). 这一发现支持了全球变暖和极端天气事件之间的联系.
科学领域:
- 古气候学 古气候学
- 古海洋学是古海洋学.
- 气候建模 气候建模
背景情况:
- 沉积风暴沉积物表明,在早期的托尔西亚高热时期 (大约183万年前) 中,热带气旋 (TC) 活动增加.
- 这表明二氧化碳上升,变暖和暴风雨活动加剧之间存在联系,但这一假设仍然未经测试.
- 在此期间潜在的TC变化的空间分布也是不清楚的.
研究的目的:
- 为了测试将早期托尔西安变暖与增加的TC活动联系在一起的假设.
- 为了研究在早期的Torcian高热期间潜在的TC变化的空间模式.
- 确定二氧化碳增加对泰提斯海洋风暴发生和强度的影响.
主要方法:
- 利用气候模型的结果来模拟早期Toarcian超热时期的条件.
- 分析模型输出以确定风暴起源中心和评估风暴强度.
- 将模型预测与风暴沉积物的地质证据进行了比较.
主要成果:
- 在西北和东南的泰提斯海洋确定了两个潜在的风暴起源中心.
- 模型结果表明,二氧化碳的翻倍 (500至1000ppmv) 增加了特提斯河上更强大的TC的概率.
- 模拟条件也表明海岸侵蚀潜力增加.
结论:
- 该研究证实,TC强度的增加伴随着Toarcian早期的全球变暖.
- 这些发现支持了二氧化碳增加,超热事件和暴风雨活动加剧之间的联系.
- 模型结果与风暴沉积物的地质证据一致,验证了拟议的气候风暴联系.
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