The goal of the campaign, led by Federico Bianchi, University of Helsinki, is to further understand and quantify at a molecular level the various processes and mechanisms that govern new-particle formation in the free troposphere.
The 6-month field study with state-of-the-art instrumentation (APiTOFs, CI-APiTOFs, PTR3, PSMs, NAISs, etc) will complement the previous studies performed at Jungfraujoch (Switzerland) and Pyramid (Nepal) high altitude stations with similar setups.
From the comprehensive datasets, the scientific team expects to constrain the chemistry driving free-tropospheric new-particle formation and to answer the following questions:
- Are sulfuric acid concentrations high enough to enable nucleation on its own?
- Do ammonia or amines contribute to nucleation at this altitude far away from the sources?
- Can we observe pure organic nucleation?
- Are organosulfates or organonitrates essential contributors for new-particle formation?
- Are any organic compounds involved of biogenic or anthropogenic origin?
- What drives particle growth to 3 nm?
To answer theses questions, the project has three key scientific objectives:
- To determine the chemical nature of naturally charged and neutral particles clusters at a
high-altiude site complementary to the other two previously studied sites;
- To stablish a quantitative link between detected clusters and newly formed particles;
- To identify the impact of environmental conditions on the cluster composition, by comparing results
from fours different sites (Hyytiälä included) around the world.
For more details, see the webpage of the Bolivia Campaign.