1I: Web-based GECKO-A Library

We used the Generator of Explicit Chemistry and Kinetics for Organics in the Atmosphere (GECKO-A) model to generate a library of gas and particle-phase products from the photo-oxidation of important precursor hydrocarbons.  The precursors include both anthropogenic ((pentane, hexane, heptane, octane, decane, dodecane, benzene, and toluene ) and biogenic (isoprene, α-pinene, β-pinene, β-myrcene, limonene, ocimene, and sabinene) compounds. The user can specify five different environmental conditions (urban, polluted continental, continental, remote continental, and remote), and can peruse a number of different outputs (SOA yields, O/C ratios, van Krevelen diagrams, top ten gas and particle species, frequency distributions of carbon mass, carbon chain length, functional groups distribution, vapor pressure, and Henry’s law coefficients).  

The GECKO-A web-based library provides researchers with a method to estimate rapidly the major characteristics of the complex mixture of intermediate compounds spawned by a single hydrocarbon precursor.  This allows for better planning and interpretation of chamber or field experiments, and provides a natural point of feedback to the evaluation and improvement of the GECKO-A model.

Sample screenshot from the web-based library of GECKO-A output.
Figure 1. Sample screenshot from the web-based library of GECKO-A output.  Users can select from 15 precursor hydrocarbons, 5 different environmental conditions, and a variety of outputs (e.g. top 10 species, vapor pressures, Henry’s law coefficients) in both gas and particle phases. Click for larger image.