Toarcian extreme warmth led to tropical cyclone intensification

Toarcian extreme warmth led to tropical cyclone intensification
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托阿尔奇极端高温导致热带气旋增强

DOI:
10.1016/j.epsl.2015.06.003
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发表时间:
2015
影响因子:
5.3
通讯作者:
Immenhauser
Immenhauser
中科院分区:
地球科学1区
文献类型:
--
作者:
Krencker;Heimhofer;Kabiri;Immenhauser

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模型预测,在一个变暖的星球上,热带气旋的强度应该会增加。然而,观察这种关系仍然是一项艰巨的任务,因为从人类记录中还没有出现明确的趋势。地质学的过去提供了研究这种关系的机会,通过观察极端温暖的事件,如Toarcian海洋Anoorphic事件(T-OAE,早侏罗世,约。181 Ma)。在这项研究中,我们记录的T-OAE在潮汐为主的高阿特拉斯盆地的摩洛哥,与平均风暴天气波基地急剧加深的发病过程中发生的风暴相关的存款的增加。高阿特拉斯盆地的古纬度(早侏罗世为北纬18°)排除了冬季风暴作为这些沉积物形成背后的驱动机制,并指出在T-OAE全球变暖期间热带气旋强度急剧增强。这些新的结果,结合以前报道的风暴沉积物无处不在的外观在T-OAE在特提斯岛西部地区的热带海洋,支持的概念,全球平均强度的热带气旋将增加在未来世纪由于人为气候变化。
Models predict that tropical cyclone intensity should increase on a warming planet. Observing this relationship remains, however, a difficult task since no clear trend is yet emerging from the anthropogenic record. The geological past offers the opportunity to study this relationship by looking at episodes of extreme warmth, such as the Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, ca. 181 Ma). In this study, we document an increase in the occurrence of storm-related deposits during the onset of the T-OAE in the tide-dominated High Atlas Basin of Morocco, associated with a drastic deepening of the mean storm weather wave base. The palaeolatitude of the High Atlas Basin (18° North during the Early Jurassic) rules out winter storms as the driving mechanism behind the formation of these deposits and points to a dramatic intensification of tropical cyclone intensity during the T-OAE global warming. These new results, combined with the previously reported ubiquitous appearance of storm deposits during the T-OAE in tropical seas of the western Tethyan area, support the concept that the globally averaged intensity of tropical cyclones will increase in the coming century due to the anthropogenic climate change.
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