Most people on earth live in cities and they are responsible for the majority of greenhouse gas emissions. Cities are also where exposure to poor air quality is most frequent and most variable. Understanding and managing the path to net-zero greenhouse gas emissions, improved public health and lower public health inequities requires a view into the emissions and atmospheric chemistry of cities with the fine-grained detail that allows evaluation of specific processes and variations from one neighborhood to another. In this talk, I will describe the development of the Berkeley Environment, Air Quality and CO2 Network (BEACO2N http://beacon.berkeley.edu/about/), a dense network for mapping urban CO2, NOx, CO, O3 and aerosol. Each node of the network contains multiple optical and ChemFET sensors which accurately quantify the trace gases and are calibrated in the field using a variety of cross-referencing methods and comparisons with traceable standards. Integration of the BEACO2N maps with simple Gaussian plume models and sophisticated inversions employing high resolution weather models provide unique observational constraints on spatial and temporal patterns of CO2 and other emissions. Examples from the COVID shelter-in-place and testing models of fuel efficiency vs. vehicle speed in the SF Bay Area will be described along with prospects for further extension to other cities and other chemicals.
Organized by Stanford OSA/SPIE Student Chapter with SPRC and Ginzton Lab
Bio: Ronald C. Cohen, Ph.D. is Professor of Atmospheric Chemistry at the University of California, Berkeley. He was Director of the Berkeley Atmospheric Science Center from 2006-2016. Cohen is known for his work on the atmospheric nitrogen cycle, the temperature dependence of ozone and urban emissions of greenhouse gases. He is a fellow of the American Association for the Advancement of Science and the American Geophysical Union. Cohen has mentored over 50 PhD students and postdoctoral fellows and is co-author of over 280 peer-reviewed scientific papers.