Classification of aerosol-cloud interaction regimes over Tokyo
Classification of aerosol-cloud interaction regimes over Tokyo
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DOI：
10.1016/j.atmosres.2022.106150
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发表时间：
2022
影响因子：
5.5
通讯作者：
R. Misumi;Yasushi Uji;K. Miura;T. Mori;Y. Tobo;Yoko Iwamoto
中科院分区：
文献类型：
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作者：
R. Misumi;Yasushi Uji;K. Miura;T. Mori;Y. Tobo;Yoko Iwamoto
以往的研究表明，气溶胶的间接效应有三种机制（气溶胶限制，上升气流限制，过渡制度）。然而，这种制度的分类并没有被广泛用于实地观测，因为它需要测量云底附近的上升气流或过饱和度（Smax），这是不容易执行的。在这项研究中，我们试图使用有效的过饱和度（Seff），这是比较容易估计匹配云滴数浓度（Nc）和云凝结核的过饱和度光谱的制度进行分类。地块模型模拟进行检查的适用性seffas代理为smax。此外，在东京上空458米附近观测到的35个低空云案例被分为三个区域。在气溶胶限制的制度，Nc增加更迅速地与增量的气溶胶比在其他两个制度，表明制度分类使用Seff是足够强大的。当偏北风盛行时，东京的气溶胶限制区频繁出现，表明东京附近的本地污染源对气溶胶云相互作用的影响。结果表明，人为气溶胶排放影响东京的气候。
Previous studies on the aerosol indirect effect have demonstrated that there are three regimes (aerosol-limited, updraft-limited, and transitional regimes). However, this classification of regimes has not been widely used in field observations as it requires measurements of updraft or supersaturation near the cloud base (Smax), which are not easy to perform. In this study, we attempted to classify the regimes using the effective supersaturation (Seff) which is relatively easy to estimate by matching cloud droplet number concentration (Nc) and supersaturation spectra of cloud condensation nuclei. Parcel model simulations were performed to examine the suitability ofSeffas a proxy forSmax. Further, 35 low-level cloud cases observed around 458 m over Tokyo were classified into three regimes. In the aerosol-limited regime,Ncincreased more rapidly with an increment of aerosols than in the other two regimes, indicating that the regime classification usingSeffwas sufficiently robust. The aerosol-limited regime in Tokyo appeared frequently when northerly winds prevailed, indicating the impact of local pollution sources around Tokyo on the aerosol cloud interaction. The results imply that anthropogenic aerosol emissions affect the climate of Tokyo.