Toarcian Greenhouse Warming Shifted Climate Belts Poleward With Global Change Implications

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Yan Wang, Micha Ruhl, Jian Cao, Wenxuan Hu, Dongming Zhi, Yong Tang, Jinchao Liu
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引用次数: 0

Abstract

Atmospheric convection is predicted to change in response to anthropogenic global warming, leading to a poleward expansion of the Hadley cells and associated arid climate belts. The magnitude of possible latitudinal change in the position of climate belts is, however, poorly understood. Here, we address this issue based on a case study of the early Toarcian (late Early Jurassic) Oceanic Anoxic Event (T-OAE, ∼183 Ma), one of the most significant global change events of the Phanerozoic, characterized by elevated humidity and major disturbances to terrestrial ecosystems on land. We present new leaf-wax n-alkanes δ13C data from the high-paleo-latitude Junggar Basin (northwest China) spanning the T-OAE and develop a time–space framework of plant-fractionation change, from low- to high-paleolatitudes across this time interval. We show that significant latitudinal changes in humidity occurred across the T-OAE (∼10°), likely because of a significant northward expansion of the low-latitude arid belts to mid-paleo-latitudes, and by inference a latitudinal expansion of the Hadley cells. This has important implications for the anthropogenic global warming and its effects on climate belts.

英国温室效应变暖使气候带向极地移动,影响全球变化
据预测,大气对流将随着人为的全球变暖而发生变化,从而导致哈德利寒带和相关的干旱气候带向极地扩张。然而,人们对气候带位置可能的纬度变化幅度知之甚少。本文以早白垩世(早侏罗世晚期)海洋缺氧事件(T-OAE, ~ 183 Ma)为例进行了研究,该事件是显生宙最重要的全球变化事件之一,其特征是湿度升高和陆地生态系统受到重大干扰。本文利用高古纬度准噶尔盆地的叶蜡正构烷烃δ13C数据,建立了从低古纬度到高古纬度植物分馏变化的时空框架。我们发现,湿度在整个T-OAE(~ 10°)发生了显著的纬向变化,这可能是由于低纬度干旱带向中古纬度的显著北扩展,由此推断出Hadley环流的纬向扩展。这对人为全球变暖及其对气候带的影响具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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