Atmospheric feedbacks reverse the sensitivity of modeled photosynthesis to stomatal function

Stomata mediate fluxes of carbon and water between terrestrial plants and the atmosphere. These fluxes are governed by stomatal function and can be modulated in many Earth system models by an empirical parameter within the calculation of stomatal conductance, the stomatal slope (g1M). Intuitively, g1M represents the marginal water cost of carbon, relating it to the emergent plant property of water use efficiency. Observations show that g1M can range widely across and within plant types in varying environments, and this distribution of g1M is not captured within Earth system models which represent each plant type with a single g1M value. Here we examine how g1M influences photosynthesis using coupled Earth system model simulations by perturbing g1M to observed 5th and 95th percentiles for each plant type. We find that high g1M reduces photosynthesis nearly everywhere, while low g1M has regionally dependent responses. Under fixed atmospheric conditions, low g1M increases photosynthesis in..., This dataset contains model output from simulations using the Community Earth System Model version 2 (CESM2; Danabasoglu et al., 2020), which is comprised of the Community Land Model 5 (CLM5; Lawrence et al., 2019), the Community Atmosphere Model 6 (CAM6; Bogenschutz et al., 2018), and a slab ocean based on output from the CESM2 Coupled Model Intercomparison Project Phase 6 (CMIP6; Danabasoglu & Gent, 2009) preindustrial control run.
, , # Data from: Atmospheric feedbacks reverse the sensitivity of modelled photosynthesis to stomatal function

This repository contains climate simulation output from simulations run at 0.9x1.25° spatial resolution on the Community Earth System Model version 2 (CESM2; Danabasoglu et al., 2020), which is comprised of the Community Land Model 5 (CLM5; Lawrence et al., 2019), the Community Atmosphere Model 6 (CAM6; Bogenschutz et al., 2018), and a slab ocean based on output from the CESM2 Coupled Model Intercomparison Project Phase 6 (CMIP6; Danabasoglu & Gent, 2009) preindustrial control run.

## Description of the data and file structure

This dataset is organized into zipped tarbells of the monthly timeseries output for our simulations. Each simulation has a `*_lnd.tar` for the land output and a `*_atm.tar` for the atmosphere output. Within each tarball, there is one netCDF file for each variable. Details about the simulations and variables are described further below.

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SimulationA.ta...,