José Luis Jiménez, world-renowned expert in atmospheric aerosol chemistry-physics at the University of Colorado will give a talk about his current research on Thursday, 26th September 2019 at 10:00 a.m. in the IDAEA-CSIC Sala d’Actes room.
Speaker: José Luis Jiménez (Professor Department of Chemistry – University of Colorado Boulder)
Title: Recent Results about Aerosol Sources, Properties, Processes, and Fate in Remote, Urban, and Indoor air
Date: 26th September 2019
Time: 10:00 a.m.
Venue: CID-CSIC Sala d’Actes room
Abstract: In this talk I will briefly present results from different ongoing projects in our research group. I will introduce our aircraft research program, where we are currently participating in the FIREX-AQ campaign sampling biomass burning smoke with the NASA DC8 aircraft. We are deploying an aerosol mass spectrometer (AMS) and, for the first time, an extractive electrospray (EESI) MS for 1-second aerosol molecular composition, with excellent results. I will also summarize results from the ATOM campaign, the first to sample the global remote troposphere systematically with vertical coverage. In particular global models are found to predict organic aerosols (OA) ok, but for a combination of wrong reasons as primary OA (POA) is greatly overestimated. On the other hand, models tend to predict pH which is substantially higher than the observations, with a pH ~ 0 being typical of the remote troposphere. A meta-analysis of large urban studies shows that urban secondary OA (SOA) leads to ~320,000 excess deaths per year globally, and should be the target of future regulations. Volatile Chemical Products (VCPs; McDonald et al., Science, 2018) are found to contribute about half of the VOC emissions and SOA formation for the US, London, and China. The budget, dynamics, and reactivity of organic carbon of indoor air is investigated and compared to that of outdoor studies. I will argue that “houses are sponges” that suck most gas-phase chemicals and retain and re-release them over periods of a day to many months. Finally, fundamental measurements of the organic accommodation coefficient are presented using a new chamber technique.
Bio: Jose-Luis Jimenez is a Professor of Chemistry and Fellow of CIRES at the University of Colorado-Boulder. He received a Mechanical Engineer degree from the Universities of Zaragoza and Compiegne in 1993, a PhD from MIT in 1999, and was a postdoc at Aerodyne and Caltech. He was one of the co-developers of the Aerodyne Aerosol Mass Spectrometer (AMS). He is an author of over 380 peer-reviewed papers, a Fellow of the AAAR and AGU, and an ISI Highly Cited Researcher. His group has performed extensive experimental and modeling research on the sources, properties, processing, and fate of submicron aerosols. His group has participated in multiple collaborative projects such as the field studies in CalNex 2010, Southern Atmospheric Study 2013, Atmospheric Tomography (ATOM) 2016-18 and others. For more information see http://cires1.colorado.edu/jimenez/
