Formation Process of Particles and Cloud Condensation Nuclei Over the Amazon Rainforest: The Role of Local and Remote New‐Particle Formation
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 17, 2022
- Source ID
- 10.1029/2022gl100940
Entities
People
- Bin Zhao
- Brian Gaudet
- Jerome D Fast
- Jian Wang
- Jiwen Fan
- John Shilling
- Manish Shrivastava
- Neil M. Donahue
- Rahul A Zaveri
- Yang Gao
- Ying Liu
- Zeqi Li
- shuxiao wang
Organizations
- Carnegie Mellon University
- National Natural Science Foundation of China
- National Science Foundation
- Office of Science
- Pacific Northwest National Laboratory
- Tsinghua University
- Washington University in St. Louis