Dr. Matthew Johnson is a civil servant Research Scientist in the Earth Science Division at NASA Ames Research Center. His research interest include: 1) analyzing global/regional source apportioned greenhouse gas emissions and atmospheric concentrations using “bottom-up” and “top-down” modeling techniques, 2) combining remotely-sensed, modeling, and in situ data to evaluate aerosol and trace gas emissions, transport, chemical transformation, and deposition, and 3) modeling of mineral dust and bioavailable nutrient (e.g., iron, phosphorus, nitrogen) deposition to the world’s oceans.
____________________________________________________________________________________
Recent Research Highlights
- PI on a NASA Interdisciplinary Research in Earth Science (IDS) study titled "What is the role of natural wetlands, lakes and reservoirs in the contemporary global methane cycle? Integrating new approaches to source characterization, observation-anchored models, and CarbonTracker-CH4 assessments".
- Evaluating forward and inverse modeling of global biospheric CO2 fluxes. This work will focus on 1) the ability to evaluate and constrain global biospheric CO2 fluxes with OCO-2 data and 2) the importance of prior model predictions on inverse model calculations of biospheric CO2 flux estimates.
- Member of NASA's TOLNet Science Team
- Investigating the impact of mineral dust and bioavailable nutrient deposition on marine biogeochemical cycling.
- Implemented on-line marine organic aerosol emissions into the newest version of the regional/global scale 3-D chemical transport model GEOS-Chem.
- Applying inverse modeling techniques to constrain greenhouse gas and volcanic emission inventories using airborne measurement data (i.e., aircraft and unmanned aerial systems (UASs)).