Exploring multiple steady states in Earth's long-term carbon cycle

IF 1.9 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY American Journal of Science Pub Date : 2021-09-01 DOI:10.2475/07.2021.01
Benjamin J. W. Mills, S. Tennenbaum, D. Schwartzman
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引用次数: 5

Abstract

The long-term carbon cycle regulates Earth's climate and atmospheric CO2 levels over multimillion-year timescales, but it is not clear that this system has a single steady state for a given input rate of CO2. In this paper we explore the possibility for multiple steady states in the long-term climate system. Using a simple carbon cycle box model, we show that the location of precipitation bands around the tropics and high mid-latitudes, coupled with the response of the terrestrial biosphere to local surface temperature, can result in system bi-stability. Here, maximum CO2 drawdown can occur when either the tropics or high mid-latitudes are at the photosynthetic optimum temperature of around 25°C, and a period of instability can exist between these states. We suggest that this dynamic has influenced climate variations over Phanerozoic time, and that higher steady state surface temperatures may be easier to reach than is commonly demonstrated in simple ‘GEOCARB style’ carbon cycle models.
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探索地球长期碳循环的多种稳定状态
长期的碳循环在数百万年的时间尺度上调节着地球的气候和大气中的二氧化碳水平,但对于给定的二氧化碳输入速率,这个系统是否有一个单一的稳定状态尚不清楚。本文探讨了长期气候系统中多种稳定状态的可能性。利用一个简单的碳循环箱模型,我们发现降水带在热带和中纬度高纬度附近的位置,加上陆地生物圈对当地地表温度的响应,可以导致系统双稳定性。在这里,当热带或高纬度地区处于25°C左右的光合作用最佳温度时,二氧化碳的最大减少可能发生,并且在这些状态之间可能存在一段不稳定时期。我们认为这种动态影响了显生宙时期的气候变化,并且更高的稳定表面温度可能比简单的“GEOCARB风格”碳循环模型中通常显示的更容易达到。
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
American Journal of Science
American Journal of Science 地学-地球科学综合
CiteScore
5.80
自引率
3.40%
发文量
17
审稿时长
>12 weeks
期刊介绍: The American Journal of Science (AJS), founded in 1818 by Benjamin Silliman, is the oldest scientific journal in the United States that has been published continuously. The Journal is devoted to geology and related sciences and publishes articles from around the world presenting results of major research from all earth sciences. Readers are primarily earth scientists in academia and government institutions.
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