Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 22, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL100940
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Funding
- U.S. Department of Energy (DOE) Atmospheric System Research (ASR) program via the Integrated Cloud, Land-surface, and Aerosol System Study (ICLASS) Science Focus Area
- National Natural Science Foundation of China [42275110, 22188102]
- Tencent Foundation
- U.S. National Science Foundation [AGS 2132089]
- U.S. DOE Office of Science, Biological and Environmental Research (BER) through Early Career Research Program
- DOE ASR program [DE-SC0020259, SC0021017]
- Office of Biological and Environmental Research
- Max Planck Society
- German Aerospace Center (DLR)
- FAPESP (Sao Paulo Research Foundation)
- German Science Foundation (Deutsche Forschungsgemeinschaft, DFG) within the DFG Priority Program) [SPP 1294]
- German Federal Ministry of Education and Research (BMBF) [01LB1001A]
- Brazilian Ministerio da Ciencia, Tecnologia e Inovacao (MCTI/FINEP) [01.11.01248.00]
- Amazon State University (UEA)
- FAPEAM
- LBA/INPA
- SDS/CEUC/RDS-Uatuma
- DOE [DE-A06-76RLO1830]
- Office of Biological and Environmental Research at PNNL
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Understanding the formation processes of particles and cloud condensation nuclei (CCN) in pristine environments is crucial for assessing anthropogenic impacts on climate change. This study used a sophisticated model to simulate the formation of new particles from condensable vapors and the transport of chemical species. The results showed that the new particle formation plays a significant role in the particle and CCN concentrations in the pristine Amazon boundary layer. These new particles mainly originate from long-range transport and downward transport from the upper atmosphere.
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 similar to 90% of the particle number and similar to 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 similar to 30% and similar to 20% during the dry season because of prevalent biomass burning. In both seasons, similar to 50% of the NPF-induced particles and similar to 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.
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