Formation Process of Particles and Cloud Condensation Nuclei Over the Amazon Rainforest: The Role of Local and Remote New‐Particle Formation
Formation Process of Particles and Cloud Condensation Nuclei Over the Amazon Rainforest: The Role of Local and Remote New‐Particle Formation
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DOI：
10.1029/2022gl100940
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发表时间：
2022-11
影响因子：
5.2
通讯作者：
Bin Zhao;J. Fast;M. Shrivastava;N. Donahue;Yang Gao;J. Shilling;Ying Liu;R. Zaveri;B. Gaudet;Shuxiao Wang;Jian Wang;Zeqi Li;Jiwen Fan
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作者：
Bin Zhao;J. Fast;M. Shrivastava;N. Donahue;Yang Gao;J. Shilling;Ying Liu;R. Zaveri;B. Gaudet;Shuxiao Wang;Jian Wang;Zeqi Li;Jiwen Fan
了解原始环境中粒子和云凝结核(CCN)的形成过程是评估人类活动对气候变化影响的主要挑战。利用一个先进的模式，系统地模拟了可凝结水汽和化学物质的多尺度输送形成的新粒子，我们发现，在雨季原始亚马逊边界层中，新粒子形成贡献了原始亚马逊边界层中∼的90%和∼的80%。在旱季，由于生物质燃烧的盛行，相应的贡献率仅为∼的30%和∼的20%。在这两个季节中，边界层中∼的50%和∼的85%来自于数百公里到数千公里以外形成的新粒子的长距离输送。此外，约50%-65%的NPF诱导的颗粒物和35%-50%的NPF诱导的CCN0.5%来自于高空形成的新颗粒的向下输送。
Understanding the formation processes of particles and cloud condensation nuclei (CCN) in pristine environments is a major challenge in assessing the anthropogenic impacts on climate change. Using a state‐of‐the‐art model that systematically simulates the new‐particle formation (NPF) from condensable vapors and multi‐scale transport of chemical species, we find that NPF contributes ∼90% of the particle number and ∼80% of the CCN at 0.5% supersaturation (CCN0.5%) in the pristine Amazon boundary layer during the wet season. The corresponding contributions are only ∼30% and ∼20% during the dry season because of prevalent biomass burning. In both seasons, ∼50% of the NPF‐induced particles and ∼85% of the NPF‐induced CCN0.5% in the boundary layer originate from the long‐range transport of new particles formed hundreds to thousands of kilometers away. Moreover, about 50%–65% of the NPF‐induced particles and 35%–50% of the NPF‐induced CCN0.5% originate from the downward transport of new particles formed aloft.