The Intertropical Convergence Zone (ITCZ) has an annual mean location north of the equator today. The factors determining this location and the evolution to its modern state are actively debated. Here we investigate how the Atlantic Meridional Overturning Circulation (AMOC) influences the ITCZ during the early-to-middle Miocene. By conducting a sensitivity study with an open Canadian Arctic Archipelago gateway, we show that North Atlantic Deep-Water formation strengthens the AMOC, in alignment with Miocene North Atlantic ventilation proxies. A vigorous AMOC increases northward Atlantic Ocean heat transport and cross-equatorial atmospheric energy transport shifts southwards to compensate, pushing the ITCZ northwards. Our study supports AMOC development as a strong contributor to the ITCZ's northern location today. Existing proxy-based interpretations of ITCZ history are too sparse to strongly confirm these results. We predict a strong in-phase relationship between AMOC strength and ITCZ's northward location, which should be testable in high resolution paleoclimate records.

中文翻译：

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中新世大西洋经向翻转环流对年平均热带辐合带位置的影响

今天，热带辐合带（ITCZ）的年平均位置位于赤道以北。决定这个位置的因素以及其现代状态的演变引起了激烈的争论。在这里，我们研究大西洋经向翻转环流（AMOC）如何影响中新世早中期的 ITCZ。通过对开放的加拿大北极群岛门户进行敏感性研究，我们表明北大西洋深水形成增强了 AMOC，与中新世北大西洋通风代理一致。活跃的 AMOC 增加了向北大西洋的热传输，跨赤道大气能量传输向南移动以进行补偿，从而推动 ITCZ 向北移动。我们的研究支持 AMOC 的发展，使其成为当今 ITCZ 北部地区的重要贡献者。现有对 ITCZ 历史的基于代理的解释太稀疏，无法有力地证实这些结果。我们预测 AMOC 强度与 ITCZ 向北位置之间存在很强的同相关系，这应该可以在高分辨率古气候记录中进行测试。