Abstract
Abstract The Gradient in Longitude of Atmospheric Constituents above the Mediterranean Basin (GLAM) airborne campaign was set up to investigate the summertime variability of gaseous pollutants, greenhouse gases, and aerosols between the western (∼3°E) and eastern (∼35°E) sections of the Mediterranean basin as well as how this connects with the impact of the Asian monsoon anticyclone on the eastern Mediterranean in the mid- to upper troposphere (∼5–10 km). GLAM falls within the framework of the Chemistry–Aerosol Mediterranean Experiment (ChArMEx) program. GLAM used the French Falcon-20 research aircraft to measure aerosols, humidity, and chemical compounds: ozone, carbon monoxide, methane, and carbon dioxide. GLAM took place between 6 and 10 August 2014, following a route from Toulouse (France) to Larnaca (Cyprus) and back again via Minorca (Spain), Lampedusa (Italy), and Heraklion (Crete, Greece). The aircraft flew at an altitude of 5 km on its outbound journey and 10 km on the return leg. GLAM also collected vertical profiles around the landing sites listed above. A combination of model outputs, chemical mapping analyses, and spaceborne and surface station measurements gathered prior to and during the campaign were used to interpret the in situ airborne measurements. The main outcome of this study is the impact of intercontinental transport on the longitudinal variability of pollutants, greenhouse gases, and aerosols at an altitude of 10 km. The eastern Mediterranean is affected by air masses from the Arabian Sea surface, and the western Mediterranean is impacted by air masses from North America (biomass burning) and West Africa (desert dust).
Highlights
To cite this version: Philippe Ricaud, Régina Zbinden, Valéry Catoire, Vanessa Brocchi, François Dulac, et al
We describe the GLAM airborne campaign, the datasets provided, and some of its findings, most of which focus on the long-range transport of pollutants (O3, carbon monoxide (CO)), greenhouse gases (CH4, CO2), and aerosols
By comparing the data collected during other flights with those obtained from high-altitude instrumented surface stations belonging to the World Meteorological Organization/Global Atmosphere Watch network (Pic du Midi de Bigorre and Puy de Dôme, France), total 1σ uncertainties are estimated at ±4 ppbv for CO, that is, ~3.4%; ±8 ppmv for CO2, that is, ~2%; ±20 ppbv for CH4, that is, ~1.1%; and ±15 ppbv for N2O, that is, ~4.5%
Summary
Bulletin of the American Meteorological Society, American Meteorological Society, 2018, 99 (2), pp.361 - 380. HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
