This study addresses a critical gap in understanding anthropogenic influences on tropical climate dynamics by investigating the impact of aerosol-cloud interactions on large-scale circulation. Despite extensive research on greenhouse gas-induced warming and its effects on tropical circulation, the impact of aerosols, particularly their interactions with clouds, on large-scale circulation remains understudied. Utilizing large-domain radiative convective equilibrium cloud-resolving simulations, this research demonstrates that increasing aerosol concentration intensifies tropical overturning circulation, evaluated at the mid-troposphere $(\mathcal{I})$, strongly correlating with domain mean cloud and radiative properties. Employing a weak temperature gradient approximation, I attribute variations in $\mathcal{I}$ to changes in clear-sky radiative cooling rather than stability. These radiative cooling changes are linked to humidity changes driven by warm rain suppression by aerosols. This study's findings underscore the need to take into account microphysical changes, particularly aerosol concentrations, when studying anthropogenic effects on tropical circulation.

中文翻译：

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气溶胶对云的影响导致大规模热带环流增强

这项研究通过研究气溶胶-云相互作用对大规模环流的影响，解决了理解人为对热带气候动态影响的关键差距。尽管对温室气体引起的变暖及其对热带环流的影响进行了广泛的研究，但气溶胶的影响，特别是它们与云的相互作用，对大范围环流的影响仍然没有得到充分研究。利用大域辐射对流平衡云解析模拟，本研究表明，气溶胶浓度的增加会加剧热带翻转环流，并在对流层中层进行评估$（\mathcal{我}）$，与域平均云和辐射特性密切相关。采用弱温度梯度近似，我将变化归因于$\mathcal{我}$晴空辐射冷却的变化而不是稳定性的变化。这些辐射冷却变化与气溶胶抑制暖雨所驱动的湿度变化有关。这项研究的结果强调，在研究人为对热带环流的影响时，需要考虑微物理变化，特别是气溶胶浓度。