Soil CO2 and O2 exchange at a bajada shrubland site on the Jornada Experimental Range, 2021-2025

These data are from an alluvial fan remnant (bajada; “Jornada I” landform) within the Jornada Experimental Range, about 2 km from a longstanding eddy covariance site (https://ameriflux.lbl.gov/sites/siteinfo/US-Jo1) on this same landform. The site is dominated by creosote and mesquite shrubs and has a thick, near-surface (~30 cm depth) caliche layer. The sensors are at the site of an artificial rainfall experiment (\"saturation experiment\" hence the name sat_site) for which a smaller eddy covariance tower was also erected. The measurements are high temporal resolution (5-minute) and include soil temperatures, moistures, CO2 and O2 concentrations as well as surface CO2 fluxes measured using Eosense eosFD chambers. The data were collected as part of the Dryland Critical Zone project (NSF Award #2012475) and were deployed to address questions about CO2 exchange in drylands over longer time periods and especially during pulsed moisture events.

Each Eosense eosFD sensor logged its own data. The other data were logged using a Campbell CR1000. The raw CR1000 and Eosense eosFD/eosGP logger files were processed following sensor manual suggestions and calculations to convert raw voltages/signals to physical units. We applied calibration constants and merged variables into a single time series at a 5-minute timestep with NA for all missing values during the measurement period. The script is included as saturation_site_sensors.Rmd. Though some included data are as recent as 2025, most of the included data are from 2021-2023. All data were hand-checked using a custom R package ( https://github.com/anthonydn/qctimeseries). Suspect data, typically due to factors like pre-deployment values, sensor power loss, or sensor failure were flagged. The sat_site_qc.csv.gz file has the raw data and the QC flags. The sat_site_clean.csv.gz file has the flagged data replaced with NA. There is also a file, sat_site_qc_checks.png, showing time series graphs of all of the variables before and after the QC process.

QC Flag Codes: 1 = approved; -1 = NA; -2 = flagged; 0 = unchecked (none remaining unchecked)