On the Remote Impacts of Mid‐Holocene Saharan Vegetation on South American Hydroclimate: A Modeling Intercomparison
On the Remote Impacts of Mid‐Holocene Saharan Vegetation on South American Hydroclimate: A Modeling Intercomparison
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DOI：
10.1029/2022gl101974
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发表时间：
2023-06
影响因子：
5.2
通讯作者：
Shivangi Tiwari;R. Ramos;F. Pausata;A. Legrande;Michael Griffiths;Hugo Beltrami;I. Wainer;A. Vernal;D. Litchmore;D. Chandan;Richard Peltier;Clay R Tabor;W. Peltier
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作者：
Shivangi Tiwari;R. Ramos;F. Pausata;A. Legrande;Michael Griffiths;Hugo Beltrami;I. Wainer;A. Vernal;D. Litchmore;D. Chandan;Richard Peltier;Clay R Tabor;W. Peltier
全新世中期(MH：6000年前)的代理重建表明，西非季风增强，南美季风减弱，这主要是由于轨道驱动的日照变化造成的。然而，解释MH轨道配置和温室气体浓度的模型研究只能部分再现这些变化。大多数模型研究没有考虑到MH期间发生的显著植被变化，特别是在撒哈拉沙漠，排除了对这一时期的现实模拟。在这里，我们使用四个完全耦合的全球气候模型来研究北非和南美的降水变化，考虑到撒哈拉沙漠的绿化。纳入绿色撒哈拉沙漠放大了这两个地区由轨道驱动的变化，并导致代理模式协议的改进。我们的工作突出了植被对当地和偏远地区的影响，以及在研究和模拟全球气候时考虑撒哈拉沙漠植被变化的重要性。
Proxy reconstructions from the mid‐Holocene (MH: 6,000 years ago) indicate an intensification of the West African Monsoon and a weakening of the South American Monsoon, primarily resulting from orbitally‐driven insolation changes. However, model studies that account for MH orbital configurations and greenhouse gas concentrations can only partially reproduce these changes. Most model studies do not account for the remarkable vegetation changes that occurred during the MH, in particular over the Sahara, precluding realistic simulations of the period. Here, we study precipitation changes over northern Africa and South America using four fully coupled global climate models by accounting for the Saharan greening. Incorporating the Green Sahara amplifies orbitally‐driven changes over both regions, and leads to an improvement in proxy‐model agreement. Our work highlights the local and remote impacts of vegetation and the importance of considering vegetation changes in the Sahara when studying and modeling global climate.