Institute of Geosciences, Johannes Gutenberg University Mainz, J.-J.-Becher-Weg 21, 55128, Mainz, Germany.
UCD School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland.
Nat Commun. 2020 Oct 28;11(1):5447. doi: 10.1038/s41467-020-19021-3.
Atmospheric circulation is a fundamental component of Earth's climate system, transporting energy poleward to partially offset the latitudinal imbalance in insolation. Changes in the latitudinal distribution of insolation thus force variations in atmospheric circulation, in turn altering regional hydroclimates. Here we demonstrate that regional hydroclimates controlled by the Northern Hemisphere mid-latitude storm tracks and the African and South American Monsoons changed synchronously during the last 10 kyrs. We argue that these regional hydroclimate variations are connected and reflect the adjustment of the atmospheric poleward energy transport to the evolving differential heating of the Northern and Southern Hemispheres. These results indicate that changes in latitudinal insolation gradients and associated variations in latitudinal temperature gradients exert important control on atmospheric circulation and regional hydroclimates. Since the current episode of global warming strongly affects latitudinal temperature gradients through Arctic amplification, our results can inform projections of likely inter-hemispheric precipitation changes in the future.
大气环流是地球气候系统的一个基本组成部分，它将能量向极地输送，以部分抵消太阳辐射的纬度不平衡。因此，太阳辐射纬度分布的变化迫使大气环流发生变化，进而改变区域水文气候。在这里，我们证明了在过去的 10 千年中，由北半球中纬度风暴轨迹和非洲和南美洲季风控制的区域水文气候同步变化。我们认为，这些区域水文气候的变化是相互关联的，反映了大气向极地输送能量的调整，以适应北半球和南半球不断变化的差异加热。这些结果表明，纬度太阳辐射梯度的变化以及相关的纬度温度梯度的变化对大气环流和区域水文气候具有重要的控制作用。由于当前的全球变暖事件通过北极放大强烈影响纬度温度梯度，我们的结果可以为未来可能的半球间降水变化提供信息。
