Environmental conditions

Environment conditions data is collected using the Vaisala CO2, Thies Clima weather sensors as well as lightning, irrigation, and weather data collected at the Maricopa site.

Data formats follow the Climate and Forecast (CF) conventions for variable names and units. Environmental data are stored in the Geostreams database.

Data sources

• WeatherStation coordinates are 33.074457 N, 111.975163 W

• EnvironmentLogger is on top of the gantry system and is moveable.

• Irrigation is managed at the field level. There are four regions that can be irrigated at different rates.

Data access

Level 1 data

Level 1 meteorological data is aggregated to from 1 Hz raw data to 5 minute averages or sums.

netCDF: 5s (12 per minute) observations

On Globus or Workbench you can find these data provided in both hourly and daily files. These files contain data at the original temporal resolution of 1/s. In addition, they contain the high resolution spectral radiometer data.

sites/ua-mac/Level_1/envlog_netcdf

• hourly files: YYYY-MM-DD_HH-MM-SS_environmentallogger.nc

• daily files: envlog_netcdf_L1_ua-mac_YYYY-MM-DD.nc

Geostreams: 5 minute observations

Data can be accessed using the geostreams API or the PEcAn meteorological workflow. These are illustrated in the sensor data tutorials.

Here is the json representation of a single five-minute observation:

Data can be accessed using the geostreams API or the PEcAn meteorological workflow.

These are illustrated in the sensor data tutorials.

Here is the json representation of a single five-minute observation from Geostreams:

[
   {
      "geometry":{
         "type":"Point",
         "coordinates":[
            33.0745666667,
            -111.9750833333,
            0
         ]
      },
      "start_time":"2016-08-30T00:06:24-07:00",
      "type":"Feature",
      "end_time":"2016-08-30T00:10:00-07:00",
      "properties":{
         "precipitation_rate":0.0,
         "wind_speed":1.6207870370370374,
         "surface_downwelling_shortwave_flux_in_air":0.0,
         "northward_wind":0.07488770951583902,
         "relative_humidity":26.18560185185185,
         "air_temperature":300.17606481481516,
         "eastward_wind":1.571286062845733,
         "surface_downwelling_photosynthetic_photon_flux_in_air":0.0
      }
   },

Variable names and units

CF standard-name	units	bety	isimip	cruncep	narr	ameriflux
air_temperature	K	airT	tasAdjust	tair	air	TA (C)
air_temperature_max	K		tasmaxAdjust	NA	tmax
air_temperature_min	K		tasminAdjust	NA	tmin
air_pressure	Pa	air_pressure				PRESS (KPa)
mole_fraction_of_carbon_dioxide_in_air	mol/mol					CO2
moisture_content_of_soil_layer	kg m-2
soil_temperature	K	soilT				TS1 (NOT DONE)
relative_humidity	%	relative_humidity	rhurs	NA	rhum	RH
specific_humidity	1	specific_humidity	NA	qair	shum	CALC(RH)
water_vapor_saturation_deficit	Pa	VPD				VPD (NOT DONE)
surface_downwelling_longwave_flux_in_air	W m-2	same	rldsAdjust	lwdown	dlwrf	Rgl
surface_downwelling_shortwave_flux_in_air	W m-2	solar_radiation	rsdsAdjust	swdown	dswrf	Rg
surface_downwelling_photosynthetic_photon_flux_in_air	mol m-2 s-1	PAR				PAR (NOT DONE)
precipitation_flux	kg m-2 s-1	cccc	prAdjust	rain	acpc	PREC (mm/s)
	degrees	wind_direction				WD
wind_speed	m/s	Wspd				WS
eastward_wind	m/s	eastward_wind				CALC(WS+WD)
northward_wind	m/s	northward_wind				CALC(WS+WD)

Raw Data

Data is available via Globus or Workbench:

• /ua-mac/raw_data/co2sensor

• /ua-mac/raw_data/EnvironmentLogger

• /ua-mac/raw_data/irrigation

• /ua-mac/raw_data/lightning

• /ua-mac/raw_data/weather

Sensor information:

• Vaisala CO2 Sensor collection
• Thies Clima Sensor collection

Computational pipeline

Environmental Logger

• Description: EnvironmentalLogger raw files are converted to netCDF.

Known Issues

Known issue: the irrigation data stream does not currently handle variable irrigation rates within the field. Specifically, we have not yet accounted for the Summer 2017 drought experiments. See terraref/reference-data#196 for more information.

When the full field is irrigated (as is typical), the irrigated area is 5466.1 m2 (=215.2 m x 25.4 m)

In 2017:

• Full field irrigated area from the start of the season to August 1 (103 dap) is 5466.1 m2 (=215.2 m x 25.4 m).

• Well-watered treatment zones from August 1 to 15 (103 to 116 dap): 2513.5 m2 (=215.2 m x 11.68 m) in total, combined areas of non-contiguous blocks

• Well-watered treatment zones from August 15 - 30 (116 to 131 dap): 3169.9 m2 (=215.2 m x 14.73 m), again in total as the combined areas of non-contiguous blocks

Github Issues

• computing-pipeline#252 Developmet discussions
• Downwelling Spectral radiometer calculations reference-data #30