Measurements of gaseous compounds and particles in the atmosphere play a critical role in our understanding of air quality, human and ecosystem health and the mechanisms governing the Earth's climate. Monitoring long term spatial and temporal changes in amount fractions of regulated air pollutants, greenhouse gases, precursors to secondary pollutants (e.g. ozone and particulate matter) and particle number and size distributions are essential to establish the scientific links and feedbacks between atmospheric composition, air quality and climate and to ensure legislative compliance. Ambient amount fractions and stable isotope ratios of many trace gases as well as particle number concentrations and size distributions are routinely observed within networks of monitoring sites and on mobile measurement platforms around the globe. Ensuring the quality and comparability of all these datasets is critical to improve reliability and reduce uncertainty in our understanding of the Earths system. This session invites contributions that seek to address the fundamental metrology needed to underpin long term ambient monitoring of trace gases and particles ensuring coherent and comparable measurements.

Convener: Dave Worton | Co-conveners: Paul Brewer, Céline Pascale, Paul Quincey, Joële Viallon
| Thu, 11 Apr, 08:30–10:15
Room 0.60
| Attendance Thu, 11 Apr, 10:45–12:30
Hall X5

Thursday, 11 April 2019 | Room 0.60

Chairperson: Dave Worton
08:45–09:00 |
| Highlight
Christof Janssen, Corinne Boursier, Hadj Elandaloussi, Pascal Jeseck, Yao Té, Robin Miri, David Jacquemart, Julian Gröbner, Alain Barbe, Vladimir Tyuterev, Semen Mikhailenko, and Evgeniya Starikova
09:00–09:15 |
| Highlight
Christoph Zellweger, Martin Steinbacher, Rainer Steinbrecher, Lukas Emmenegger, and Brigitte Buchmann
09:15–09:30 |
Maitane Iturrate-Garcia and Bernhard Niederhauser
09:30–09:45 |
Jianrong Li, Annarita Baldan, and Adriaan van der Veen
10:00–10:15 |
Edgar Flores, Ian Chubchenko, Francesca Rolle, Joele Viallon, Philippe Moussay, and Robert Wielgosz