Term Definition Status
Snow layer hardness Snow layers within the snowpack are a record of the winter’s weather. Like tree rings or strata of rock, layers can be traced to dates and conditions that formed them. One of the most important characteristics of a layer is its hardness. Harder snow is stronger and cohesive, while softer snow is weaker. ACCEPTED
Snow water equivalent The depth of water if a snow cover is completely melted, expressed in units of depth, on a corresponding horizontal surface area. ACCEPTED
Soil aggregate stability Soil aggregate stability is a measure of the ability of soil aggregates to resist degradation when exposed to external forces such as water erosion and wind erosion, shrinking and swelling processes, and tillage. Soil aggregate stability is a measure of soil structure and can be impacted by soil management. ACCEPTED
Soil classification For soil resources, experience has shown that a natural system approach to classification, i.e. grouping soils by their intrinsic property (soil morphology), behaviour, or genesis, results in classes that can be interpreted for many diverse uses. Differing concepts of pedogenesis, and differences in the significance of morphological features to various land uses can affect the classification approach. ACCEPTED
Soil coarse fraction Fraction of particles within a soil sample that are greater that 2mm in diameter ACCEPTED
Soil horizon A soil horizon is a layer parallel to the soil surface, whose physical characteristics differ from the layers above and beneath. Each soil type usually has three or four horizons. ACCEPTED
Soil moisture - ACCEPTED
Soil organic matter (SOM) Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and substances synthesized by soil organisms. ACCEPTED
Soil organic matter (SOM) density fractionation Density fraction of Soil organic matter (SOM) in soil. Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and substances synthesized by soil organisms. ACCEPTED
Soil respiration Soil respiration refers to the production of carbon dioxide when soil organisms respire. This includes respiration of plant roots, the rhizosphere, microbes and fauna. ACCEPTED
Soil temperature Temperature of soil. Default min/max values according to WMO quality control Guidelines. ACCEPTED
Soil texture Soil texture is a classification instrument used both in the field and laboratory to determine soil classes based on their physical texture. Soil texture can be determined using qualitative methods such as texture by feel, and quantitative methods such as the hydrometer method. ACCEPTED
Solids, fixed dissolved Fixed Dissolved Solids ACCEPTED
Solids, fixed suspended Fixed Suspended Solids ACCEPTED
Solids, total Total Solids ACCEPTED
Solids, total dissolved Total Dissolved Solids ACCEPTED
Solids, total fixed Total Fixed Solids ACCEPTED
Solids, total volatile Total Volatile Solids ACCEPTED
Solids, volatile dissolved Volatile Dissolved Solids ACCEPTED
Solids, volatile suspended Volatile Suspended Solids ACCEPTED
Sonic temperature Sonic temperature is similar to 'virtual Temperature' but not exactly the same and derived from speed of sound of sonic anemometers/thermometers. ACCEPTED
Sound velocity - ACCEPTED
Specific absorption coefficient SAC Please note the wavelength [nm] in the sensor description. ACCEPTED
Specific Conductivity generate a specific conductance value compensated to 25°C PENDING
Specific humidity - ACCEPTED
Specific transmission coefficient Please note the wavelength [nm] in the sensor description. ACCEPTED
Speed - ACCEPTED
Status message, device Operating parameter of a device. Status message in the form of a code or text message. ACCEPTED
Stemflow In hydrology, stemflow is the flow of intercepted water down the trunk or stem of a plant. ACCEPTED
Streamflow, discharge - ACCEPTED
Sunshine duration - ACCEPTED
Sun status - ACCEPTED
Surface radiation temperature - ACCEPTED
Suspended matter - ACCEPTED
Taxa count Count of unique taxa. A taxon (plural: taxa) is a group of one (or more) populations of organism(s), which is judged to be a unit. ACCEPTED
TDR waveform relative length Time domain reflextometry, apparent length divided by probe length. Square root of dielectric ACCEPTED
Temperature change temperature change ACCEPTED
Temperature, data logger Operating parameter of a data logger. Internal temperature data logger. ACCEPTED
Temperature, device Operating parameter of a device. Internal temperature of device. ACCEPTED
Temperature, dew point - ACCEPTED
Temperature difference - ACCEPTED
Temperature difference - ACCEPTED
Temperature, sensor Temperature, raw data from sensor ACCEPTED
Temperature, transducer signal Temperature, raw data from sensor ACCEPTED
Terrestrial Water Storage Anomaly Water mass anomalies expressed in terms of equivalent water height from all water storage compartments including snow, surface water, soil moisture, and deep groundwater; not corrected for spatial leakage. PENDING
Terrestrial Water Storage Anomaly uncertainty Time-variable component of the uncertainty estimate for the GRACE-based water storage variability, given as standard deviation per grid point. PENDING
Throughfall - ACCEPTED
THSW Index The THSW Index uses temperature, humidity, solar radiation, and wind speed to calculate an apparent temperature. ACCEPTED
THW Index The THW Index uses temperature, humidity, and wind speed to calculate an apparent temperature. ACCEPTED
Tide stage Tidal stage ACCEPTED
Time Ideally time format according to ISO 8601 (HH=hour, MM=minute, SS=second). ACCEPTED
Time, elapsed Time elapsed since an event occurred ACCEPTED
Topographic Wetness Index (TWI) Topographic wetness index (TWI), also known as the compound topographic index (CTI), is a steady state wetness index. It is commonly used to quantify topographic control on hydrological processes. ACCEPTED
Transpiration - ACCEPTED
Trunk circumference - ACCEPTED
Trunk growth - ACCEPTED
Trunk temperature - ACCEPTED
TSS Total Suspended Solids ACCEPTED
Turbidity - ACCEPTED
Turbidity, scattered light measurement Please note wavelength of the measurement. FNU: Formazine Nephelometric Units – Scattered Light Measurement (Angle 90°) according to DIN EN ISO 7027. FTU: Formazine Turbidity Unit. NTU: Nephelometric Turbidity Unit – Scattered Light Measurement (Angle 90°) according to US regulations. ACCEPTED
Turbidity, transmitted light measurement Please note wavelength of the measurement. FAU: Formazine Attenuation Units - Transmitted Light Measurement (Angle 0°) according to DIN EN ISO 7027. ACCEPTED
Ultraviolet index The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn-producing ultraviolet (UV) radiation at a particular place and time. PENDING
Value / Number consecutive number (e.g of a measurement) ACCEPTED
Vapor pressure Please Specify the kind of Vapor Pressure (e.g. satuartion vapor pressure, current vapor pressure, vapor pressure deflict) in sensor description. ACCEPTED
Vapor pressure deficit The difference between the actual water vapor pressure and the saturation of water vapor pressure at a particular temperature. ACCEPTED
Vegetation height Sensor e.g. ultrasonic measurement device. Therefore p.r.n estimation of snow height instead of vegetation height in winter. ACCEPTED
Vegetation type Vegetation is an assemblage of plant species and the ground cover they provide. ACCEPTED
Vertical velocity A velocity is a vector quantity. Vertical indicates a vector component which is positive when directed upward, negative when directed downward. ACCEPTED
Visibility - ACCEPTED
Voltage - PENDING
Voltage, battery Voltage of battery. Typically equal to supply voltage of loggers or devices. Sometimes separatly measured, e.g. voltage of lithium batterys in computers. ACCEPTED
Voltage, data logger Operating parameter of a data logger. Supply- or operating voltage of a data logger. ACCEPTED
Voltage, device Operating parameter of a device. Supply- or operating voltage of a device. ACCEPTED
Voltage ratio - ACCEPTED
Volume Volume. To quantify discharge or hydrograph volume or some other volume measurement. ACCEPTED
Watchdog error count A counter which counts the number of total datalogger watchdog errors ACCEPTED
Water column equivalent height, absolute The absolute pressure (combined water + barometric) on a sensor expressed as the height of an equivalent column of water. ACCEPTED
Water column equivalent height, barometric Barometric pressure expressed as an equivalent height of water over the sensor. ACCEPTED
Water depth - ACCEPTED
Water depth, averaged Water depth averaged over a channel cross-section or water body. Averaging method to be specified in methods. ACCEPTED
Water flux Water Flux ACCEPTED
Water level - ACCEPTED
Water potential Water potential is the potential energy of water relative to pure free water (e.g. deionized water) in reference conditions. It quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects including surface tension. ACCEPTED
Water pressure Please note if values are corrected for atmospheric pressure or not. ACCEPTED
Water temperature - ACCEPTED
Water Use, Agriculture Water pumped for Agriculture ACCEPTED
Water Use, Commercial + Industrial + Power Water pumped by commercial, industrial users. ACCEPTED
Water Use, Domestic wells Water pumped by domestic wells; residents and landowners not using public supply. Nonagriculture wells. ACCEPTED
Water Use, Public Supply Water supplied by a public utility ACCEPTED
Water Use, Recreation Recreational water use, for example golf courses. ACCEPTED
Water vapor concentration - ACCEPTED
Water vapor content, atmosphere 'atmosphere_mass_content_of_water_vapor', alias: atmosphere_water_vapor_content Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. Atmosphere water vapor content is sometimes referred to as "precipitable water", although this term does not imply the water could all be precipitated. ACCEPTED
Water vapor density - ACCEPTED
Wave height The height of a surface wave, measured as the difference in elevation between the wave crest and an adjacent trough. ACCEPTED
Weather conditions - ACCEPTED
Weight E.G. Weight of a Vessel with various water level. ACCEPTED
Weight lysimeter - ACCEPTED
Well flow rate Flow rate from well while pumping ACCEPTED
Wellhead pressure The pressure exerted by the fluid at the wellhead or casinghead after the well has been shut off for a period of time, typically 24 hours ACCEPTED
Wet-bulb temperature Isobaric wet-bulb temperature: the temperature an air parcel would have if cooled adiabatically to saturation at constant pressure by evaporation of water into it, all latent heat being supplied by the parcel. Or from wikipedia: The wet-bulb temperature (WBT) is the temperature read by a thermometer covered in cloth which has been soaked in water at ambient temperature (a wet-bulb thermometer) and over which air is passed. At 100% relative humidity, the wet-bulb temperature is equal to the air temperature (dry-bulb temperature); at lower humidity the wet-bulb temperature is lower than dry-bulb temperature because of evaporative cooling ACCEPTED