Latest Publications:
The Mega-Meta Carbonyl Sulfide Study and Community Action Plan, Biogeosciences Discussions
biogeosciences-discuss.net/bg-2017-427/
Fog in the Redwoods, Pilot Project, JGR-Biogeosciences, also see FogSci.com
agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JG003703
Global Anthropogenic Carbonyl Sulfide Inventory, Atmospheric Environment
authors.elsevier.com/c/1Wsvj4pTZHW0il
Sources of Uncertainty in Carbonyl Sulfide Technique for N America, Nature Climate Change
nature.com/articles/nclimate3272.pdf?origin=ppub

GLOBAL Photosynthesis
The main goal of this work is to understand, globally, how plant physiology changes in our changing climate.  To do this, we measure a gas called carbonyl sulfide.  It looks very similar to carbon dioxide and can interact with the same enzymes in plant leaves.  By understanding the exchange of carbonyl sulfide with components of ecosystems, we can estimate photosynthetic carbon uptake by measuring the drawdown of carbonyl sulfide over ecosystems.  I wrote an introduction to the many uses of carbonyl sulfide observations at cosanova.org.  My latest paper on this subject is in Biogeosciences: https://www.biogeosciences-discuss.net/bg-2017-427/

Sulfur Cycling
More than half of the sulfur in the air is from human activity, making the global sulfur cycle (arguably) the most perturbed of all the global elemental cycles.  Observing how sulfur-containing gases are exchanged over ecosystems will allow us to understand potential climate feedbacks and effects of geo-engineering.
My current project is involves interpreting observations of terrestrial dimethyl sulfide, the "smell of the ocean".  This gas is an important precursor to cloud condensation nucleii.  Trace amounts are produced in terrestrial ecosystems and play a role in local precipitation dynamics.  My latest paper on this subject is in Biogeochemistry.

Research Groups

I'm pleased to work with many excellent research and public outreach groups as part of my work.

Save the redwoods

As part of a new project studying fog and redwood trees, the Save the Redwoods League has been immensely supportive.  Through public engagement and financial support, we can solve a few mysteries behind how redwoods fix carbon and what might happen to them in the future, fogsci.com.

UC Santa Cruz

My measurement and modeling approach has benefited from the mutual exchange of information with Elliott Campbell and his research group at UC Santa Cruz.  Elliott taught me how to model the winds, and I taught him how to set up a laser spectrometer without blinding anyone.    

cosanova.org

Founded at the American Geophysical Union in 2014, the Carbonyl Sulfide Research Group (COSANOVA) is an international organization of researchers studying creative ways to measure photosynthetic carbon uptake, cosanova.org.  We'll work together with a newly funded EU project, cos-ocs.eu.  

carnegie institution for science

The Carnegie Institution for Science Department of Global Ecology supports the investigation of ecological processes across spatial scales. Here I work with Joe Berry's vibrant research group, using multiple approaches to estimate photosynthesis, globalecology.stanford.edu.