Skip to main content

The 25th Annual Harold I Schiff Lecture Faculty of Science: Presented by Prof. Dr. Ulrich Platt

Institute of Environmental Physics
Heidelberg University
Quantification of Volcanic Gas Emission by Optical Spectroscopy - How and Why

Thursday, June 16, 2016, 2:30 PM
103 Life Science Bldg.
York University

Prof. Dr. Ulrich Platt

Prof. Dr. Ulrich Platt


Abstract
: Volcanoes play an enormous role for the Earth system and for our atmosphere. Therefore, volcanic gas emissions are studied not only out of scientific curiosity. In addition to their influence on the atmosphere composition and emission rate of volcanic gases are a window to processes occurring in the Earth’s interior, also volcanic eruptions forecast can be improved by measuring variations of gas emissions    ratios e.g. CO2/SO2 or BrO/SO2. In recent years spectroscopic quantification of gas emissions from volcanoes and other sources made enormous progress. In particular passive spectroscopic approaches observing volcanic gases based on their observation of scattered sun-light in the ultra-violet (UV) spectral range evolved from an art to mature techniques. For instance UV spectrometers form the Continue reading


The 24th Annual Harold I Schiff Lecture Faculty of Science: Presented by Steven S Brown

NOAA Earth System Research Laboratory
and Department of Chemistry, University of Colorado

The Atmospheric Chemistry of Winter

Thursday, May 28, 2015, 2:30 PM

103 Life Science Bldg.
York University

Abstract: The study of lower atmospheric chemistry, at least at northern mid-latitudes where a large fraction of the world’s population resides, has largely been a story of summertime phenomena. Rapid, summertime photochemical oxidation converts primary emissions into secondary pollutants, such as ozone and aerosols, in regions very near the emission sources, leading to significant impacts on air quality and human health. Winter oxidative processes tend to be much slower, allowing for wider dispersion of primary pollutants and generally weaker air quality impacts in the immediate vicinity of source regions. Yet there remain interesting and important chemical cycles that are Continue reading


23rd Annual Harold I Schiff Lecture Faculty of Science: Prof. Dr. habil Astrid Kiendler-Scharr

23rd Annual Harold Schiff Lecturer, Dr. Prof. Habil Astrid Kiendler-Scharr

23rd Annual Harold Schiff Lecturer, Dr. Prof. Habil Astrid Kiendler-Scharr

Speaker: Prof. Dr. Habil Astrid Kiendler-Scharr

Title: Chemistry Climate Interactions: Biogenic Emissions and their Contribution to Secondary Organic Aerosol

Date: October 31, 2013, 2:30 PM

Venue: 103 Life Science Building

Abstract:   Atmospheric aerosols impact climate directly by scattering and absorbing solar radiation and indirectly by acting as ice and cloud condensation nuclei. Secondary organic aerosols (SOA) comprise an important component of atmospheric aerosols. Biogenic volatile organic compounds (BVOC) emitted by vegetation are a major source of SOA. It is known that BVOC emissions depend on climate, specifically on temperature and light. Therefore it is to be expected that a chemistry-climate interaction exists, in which climate change induces changes in BVOC emissions and thereby SOA formation, which feeds back to climate. The presentation details the state of the art knowledge on biogenic SOA and its climate relevance. The question whether climate induced changes in biogenic SOA formation may attenuate or amplify climate change is addressed based on experiments conducted in the Jülich Plant Atmosphere Chamber. Brochure - Y-File

http://www.youtube.com/watch?v=NWaf5T4ThTY&feature=youtu.be