CIMIS / AmeriFlux

CIMIS

Developer	California Department of Water Resources (DWR) and the University of California, Davis (UC Davis)
Overview	The California Irrigation Management Information System (CIMIS) is a program for weather data collection transmission and processing for California. CIMIS was developed in 1982 by DWR (UC Davis). It was designed to assist irrigators in managing their water resources more efficiently. CIMIS stations collect weather data that is analyzed and stored in a database server, which makes it available over the internet.
Coverage	Statewide, California (currently 145 stations)
Sensors	Total solar radiation (pyranometer) Soil temperature (thermistor) Air temperature/relative humidity (HMP35) Wind direction (wind vane) Wind speed (anemometer) Precipitation (tipping-bucket rain gauge)
Number of stations in the Delta	15 (vicinity of the Delta)
Data frequency	CIMIS data provided in hourly, daily, and monthly timesteps.
Data availability	Freely available from the website. Requires a user's registration for an online account.
Data Format	Web report, XML, CSV, or PDF
Website	https://cimis.water.ca.gov
Note	Spatial CIMIS is a derived product of CIMIS and is an interpolated model of weather information (air temperature, relative humidity, and wind speed values at 2km pixels) that provides information on areas between CIMIS stations for the purposes of reference ET (ETo). Daily ETo at a 2 km spatial resolution are calculated statewide using the American Society of Civil Engineers version of the Penman-Monteith equation (ASCE-PM). See Spatial CIMIS model description for more details.

References

Howes, D. J. (2017). A Comparative Study for Estimating Crop Evapotranspiration in the Sacramento-San Joaquin Delta - Appendix F. Irrigation Training and Research Center Mapping Evapotranspiration at High Resolution with Internalized Calibration (ITRC-METRIC). UC Davis, CA.

Morandé, J. A., Trezza, R., Anderson, A., U, K. T. P., Jin, Y., Jankowski, J., Chen, Y. (2018). A Comparative Study for Estimating Crop Evapotranspiration in the Sacramento-San Joaquin Delta - Appendix L: Evapotranspiration Estimation from Unmanned Aerial Vehicle Imagery. UC Davis, CA

AmeriFlux

Developer	US Dept of Energy
Overview	A network of PI-managed sites measuring ecosystem CO₂, water, and energy fluxes.
Coverage	North, South, Central America
Sensors	Description of all variable available: https://ameriflux.lbl.gov/data/aboutdata/data-variables/ See BADM for instrument guidelines.
Number of stations in the Delta	6 core sites
Data frequency	30min intervals (core stations)
Data availability	Freely available from the website. Requires online account.
Data format	Online query exports CSV
Website	https://ameriflux.lbl.gov
Notes	Core sites are operated by Dennis Baldocchi of UC Berkeley for the California Delta cluster. All sites use the Biological, Ancillary, Disturbance and Metadata (BADM) protocol, standardized across AmeriFlux, ICOS, Fluxnet and other networks.

References

Eichelmann, E., Hemes, K. S., Knox, S. H., Oikawa, P. Y., Chamberlain, S. D., Sturtevant, C., Baldocchi, D. D. (2018). The effect of land cover type and structure on evapotranspiration from agricultural and wetland sites in the Sacramento–San Joaquin River Delta, California. Agricultural and Forest Meteorology, 256–257(March), 179–195. https://doi.org/10.1016/j.agrformet.2018.03.007

Hatala, J. A., Detto, M., Sonnentag, O., Deverel, S. J., Verfaillie, J., & Baldocchi, D. D. (2012). Greenhouse gas (CO2, CH4, H2O) fluxes from drained and flooded agricultural peatlands in the Sacramento-San Joaquin Delta. Agriculture, Ecosystems and Environment, 150, 1–18. https://doi.org/10.1016/j.agee.2012.01.009