Counts record the number of times a phenomenon occurs.
Indicator |
Metric |
Air Frost |
days when Tmin < 0.0 oC in a certain period of time* |
Plant Development |
months when Tavg > Tbase for development |
Growing Season Range |
days between Start Growing Season and End Growing Season (see Dates) [Barnett et al., 2006] |
Growing Season Length |
days when Tavg > Tbase for growth between Start and End of Growing Season (see Dates) |
Access Period Range |
return to FC - end of FC [Barnett et al., 2006] |
Access Period Length |
days when soil moisture < FC [Barnett et al., 2006] |
Dryness |
days when P < Pt [Barnett et al., 2006] |
Wetness |
days when P > Pt [Barnett et al., 2006] |
Plant Heat Stress |
days when Tmax > Tc [Barnett et al., 2006] |
Dry Soil Days |
days when soil moisture < SWCWP [Barnett et al., 2006] |
Very Dry Soil |
days when soil moisture < ADW [Barnett et al., 2006] |
*year, coldest month, and winter trimester (December-February in the northern hemisphere; June-August in the southern hemisphere)
Tmin (oC): minimum air temperature
Tavg (oC): average air temperature
Tbase (oC): base temperature (for development, e.g. 5 oC; for growth, e.g. 5.6 oC)
FC (m3 m-3): field capacity (see Water balance)
P (mm): precipitation
Pt (mm): minimum threshold precipitation (e.g. 0.2 mm)
Tc (oC): critical air temperature (e.g. 25 oC)
SWCWP (mm): soil water content at wilting point (see Water balance)
ADW (mm): air-dried soil water content (see Water balance)
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