annual arithmetic mean.
- Browse Related Terms: AAM, AGM, Average, B/C, Capital investment, Index of Wetness
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- Browse Related Terms: AAR, ACR, Alkali-aggregate reaction (AAR), Alkali-carbonate reaction (ACR), Alkali-silica reaction (ASR), Alkali-silicate/silica reaction (ASSR), ASR, ASSR, DI, diatom, Pattern cracking
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Abbreviation for antibody.
- Browse Related Terms: A-site, AB, BABS, basic fibroblast growth factor, BFGF, IPR, MAB, npt-II, ovum pickup, parts per million, PERV, plant variety protection, v/v
- Browse Related Terms: °C, AB, Additive effect, Celsius (C), (°C), EEO, Fahrenheit (F), Fly ash, Median, Medium-size water system, Mill, Nominal dollars
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Widely accepted model of flower organ identity that appears generally applicable to distantly related dicotyledon ous, although less well to monocotyledon ous plants. The model incorporates the Arabidopsis genes required for flower organ identity.
- Browse Related Terms: ABC model, angiosperm, dicotyledon, gibberellins, gymnosperm, inflorescence, monocotyledon, perennial, petal, phytochrome, plastid, pseudocarp, pyrethrins, short-day plant, variegation, vernalization, vessel element
With regards to physics, a discontinuity or distortion in an image produced by a lens. There is also Astronomical Aberration, which is completely unrelated, and describes the difference between the apparent position of a star to an observer on earth and the actual position of the star in the sky. This is due to the time it takes the light from the star to reach us. (In the mean time, while observers on earth are 'waiting' for the star light to reach them, the star has moved). For example, when we look up in the sky, we are seeing where the sun was 9 minutes ago, since it takes light from the sun 9 minutes to reach the earth.
- Browse Related Terms: Aberration, Big Bang, Cosmological Principle, Curvature of Spacetime, General Relativity, Hubble's Law, Milky Way, Quasar, Recede, Relativity, Spacetime, Supernova
Absence of living organisms.
Nonliving. Compare biotic.
Having an absence of life or living organisms.
- Browse Related Terms: Abiotic, anaerobic digestion, Bioassay, Biochemical conversion process, Bioconcentration, Biological oxidation, Biome, bioremediation, Biotechnology, Biotic, BOD5, Cellulase, Clone, Ecology, Ecosystem, Landfill gas, Methanogen, Organic, Organic level, PCB´s, Watershed
Non-living or non-biological; includes chemical and physical environments and processes.
- Browse Related Terms: Abiotic, Anthropogenic emissions, Demand-side management, Direct effects, Ecosystem, Effects, Full-time equivalent (FTE), Indirect effects, NatureServe, Noise criteria, Reclamation, Stressors
The absence of living organisms.
Outside (nonliving) factors which can cause harmful effects to plants, such as soil conditions, drought, extreme temperatures.
- Browse Related Terms: Abiotic stress, co-evolution, glycoalkaloids, halophyte, nitrification, Nitrogen fixation, salt tolerance, soil amelioration, soil-less culture, thermophile, water potential, xerophyte
Ablation (1) Combined processes (such as sublimation, fusion or melting, evaporation) which remove snow or ice from the surface of a glacier or from a snow-field. Also used to express the quantity lost by these processes. (2) Reduction of the water equivalent of a snow cover by melting, evaporation, wind and avalanches.
- Browse Related Terms: Ablation, Cryosphere, freshwater, Geosphere, Geothermal energy, glacier, haline, Hydrologic Cycle, Hydrosphere, ice rafted detritus, ice sheet, jökulhlaup, loess, tephra, varve, Wetland
The process by which ice and snow dissipate owing to melting and evaporation.
- Browse Related Terms: Ablation, Acidified, Aliquot, Erratic, Firn (Snow), Firn Line, Flooded Ice, glacier, Glacier (ice sheet), Metamorphic, Snow Accumulation and Ablation Model, Snow Core, Snow Water Equivalent, Snowmelt Flooding, Snowpack, Water Equivalent, Weighing-type Precipitation Gage
Depletion of snow and ice by melting and evaporation.
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a change in the climate (for example, temperature or precipitation) that takes place over a few decades or less, persists for at least a few decades, and causes substantial disruptions in human and natural systems.
- Browse Related Terms: abrupt climate change, Adaptation, Climate change, Climate Lag, Emissions, environment, forcing, Forcing Mechanism, Global Warming, mechanism, Radiative Forcing, Resonance, Sector
the process of determining a specific, numerical age for an old material. This may be accomplished using one of a variety of methods, including radiocarbon dating.
- Browse Related Terms: absolute dating, Air pollution, Biodegradable, Decomposition, Degradable, Enteric fermentation, Nonbiodegradable, Particulate, radiocarbon (14C), radiocarbon dating, relative dating
Absolute humidity (1) The ratio of the mass of water vapor to the volume occupied by a mixture of water vapor and dry air. (2) Mass of water contained in a unit volume of moist air.
The mass of water vapor in a given volume.
- Browse Related Terms: Absolute humidity, accumulation, air density, Air Pressure, Atmosphere, Atmospheric Pressure, Barrel, Concentration, Density, doppler velocity (m/s), Electrons, Mixing Ratio, particle number concentration, particle size distribution, Specific Humidity, stability, Streamflow, Subsidence, Sverdrup, Vapor Pressure
The ratio of the mass of water vapor to the volume occupied by a mixture of water vapor and dry air.