Concepts

Number of days from autumn snow onset to spring snowmelt, providing temperature stabilization and protection for overwintering organisms

Temperature accumulation metric calculated using averaging method with base temperature, used to predict insect phenology and plant development

The fraction of solar radiation reflected by the surface, with snow-covered surfaces having high albedo (0.8) and snow-free surfaces having lower values

Standardized measure of water deficit calculated using the Standardized Precipitation Evapotranspiration Index (SPEI) over 12-month periods

The difference between net radiation flux at the surface under all-sky and clear-sky conditions, accounting for both downwelling and upwelling radiation changes

Maximum temperature of warmest month, capturing seasonality in contrast to average annual temperatures

Measure of cloud opacity to solar radiation, related to cloud droplet concentration and size distribution

Classification of cloud particles as liquid water droplets, ice crystals, or mixed phase

Spectral band ratio that leverages the fact that snow reflectance is high in visible wavelengths and low in shortwave infrared wavelengths

Climatic index reflecting atmospheric pressure differences between Iceland and Azores

Temporal variation in precipitation patterns expressed as coefficient of variation in monthly precipitation over 5 years

Temperature dependence of larval feeding rate, characterized by maximum feeding rate, optimal temperature, and thermal sensitivity parameters

The difference between the amount of moisture in the air and how much moisture the air can hold when it is saturated, indicating evaporative demand

The slope of peak NDVI as a linear function of the June Palmer Drought Severity Index, representing plant productivity responses to early growing season drought conditions

Duration of favorable conditions for bee development and reproduction, shorter at high elevations

Environmental gradient characterized by declining water availability, derived from temperature and precipitation variables

Upper temperature limit where organisms lose fitness and performance ability

Parameter describing the water uptake ability of aerosol particles using κ-Köhler theory

The rate at which temperature decreases with elevation, typically expressed as degrees Celsius per kilometer