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Exoplanet and brown dwarf atmospheres commonly show signs of disequilibriumchemistry. In the James Webb Space Telescope era high resolution spectra ofdirectly imaged exoplanets will allow the characterization of their atmospheresin more detail, and allow systematic tests for the presence of chemical speciesthat deviate from thermochemical equilibrium in these atmospheres. Constrainingthe presence of disequilibrium chemistry in these atmospheres as a function ofparameters such as their effective temperature and surface gravity will allowus to place better constrains in the physics governing these atmospheres. Thispaper is part of a series of works presenting the Sonora grid of atmospheremodels (Marley et al 2021, Morley et al in prep.). In this paper we present agrid of cloud-free, solar metallicity atmospheres for brown dwarfs and wideseparation giant planets with key molecular species such as CH4, H2O, CO andNH3 in disequilibrium. Our grid covers atmospheres with Teff~[500 K,1300 K],logg~[3.0,5.5] (cgs) and an eddy diffusion parameter of logKzz=2, 4 and 7(cgs). We study the effect of different parameters within the grid on thetemperature and composition profiles of our atmospheres. We discuss theireffect on the near-infrared colors of our model atmospheres and thedetectability of CH4, H2O, CO and NH3 using the JWST. We compare our modelsagainst existing MKO and Spitzer observations of brown dwarfs and verify theimportance of disequilibrium chemistry for T dwarf atmospheres. Finally, wediscuss how our models can help constrain the vertical structure and chemicalcomposition of these atmospheres.

The Sonora Substellar Atmosphere Models. II. Cholla: A Grid of Cloud-free, Solar Metallicity Models in Chemical Disequilibrium for the JWST Era