Seminar: Global-Scale In Situ Measurements of Atmospheric Composition: Results from the Atmospheric Tomography Mission (ATom)

Wann: 14.10.2019 14:00
Wo: Hahn-Meitner-Weg 1 55128 Mainz

Charles Brock, Chemical Sciences Division, NOAA Earth System Research Laboratory (Host S. Borrmann)

The seminar takes place on Monday 14th October at 14.00 in the seminar rooms 2/3 of the MPI for Chemistry.

Abstract

From August 2016 to May 2018, an instrumented DC-8 aircraft operated by NASA performed global-scale in situ measurements, making nearly continuous vertical profiles between ~0.18 and ~13 km altitude as the aircraft flew over the central Pacific and Atlantic oceans from ~83 ºN to ~86 ºS latitude in each of four seasons. Reactive, tracer, and greenhouse-active gas phase species were measured, along with particle size distributions, single particle and bulk aerosol composition, and cloud physics and meteorological parameters. Comparisons between these measurements and global models show significant differences regarding new particle formation and growth to cloud-active sizes, the abundance of sea-salt particles in the free troposphere, and the prevalence of biomass burning aerosol. These comparisons have already resulted in improvements to the models. A previously undetected oxidation product of DMS, hydroperoxymethyl thioformate, may be a major reservoir of marine sulfur, with significant consequences for the global sulfur cycle, aerosol formation, and climate.