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What (who) is evapotranspiration - definition
BIOPHYSICOGEOCHEMICAL PROCESS
Potential evapotranspiration; Tree sweat; Evapotranspirator; PET (ecology); Evapotranspiration rate; Evapotranspiration rates; Crop evapotranspiration
![Monthly estimated potential evapotranspiration and measured pan evaporation for two locations in [[Hawaii]], Hilo and Pahala](https://commons.wikimedia.org/wiki/Special:FilePath/Potential evapotranspiration Hawaii.gif?width=200 "Monthly estimated potential evapotranspiration and measured pan evaporation for two locations in [[Hawaii]], Hilo and Pahala")
evapotranspiration
[??vap??transp?'re??(?)n]
¦ noun the process by which water is transferred from the land to the atmosphere by evaporation from the soil and other surfaces and by transpiration from plants.
Evapotranspiration
Evapotranspiration (ET) is a term used to refer to the combined processes by which water moves from the earth’s surface into the atmosphere. It covers both water evaporation (movement of water to the air directly from soil, canopies, and water bodies) and transpiration (movement of water from the soil, through roots and bodies of vegetation, on leaves and then into the air).
Standardised Precipitation Evapotranspiration Index
SPEI
The Standardised Precipitation-Evapotranspiration Index (SPEI) is a multiscalar drought index based on climatic data. It can be used for determining the onset, duration and magnitude of drought conditions with respect to normal conditions in a variety of natural and managed systems such as crops, ecosystems, rivers, water resources, etc.
Wikipedia
Evapotranspiration
Evapotranspiration (ET) is the combined processes by which water moves from the earth’s surface into the atmosphere. It covers both water evaporation (movement of water to the air directly from soil, canopies, and water bodies) and transpiration (movement of water from the soil, through roots and bodies of vegetation, on leaves and then into the air). Evapotranspiration is an important part of the local water cycle and climate, and measurement of it plays a key role in agricultural irrigation and water resource management.
Examples of use of evapotranspiration
1. During periods of slow evapotranspiration _ when plants require less water _ farmers can cut down on irrigation.
2. Many farmers already use a formula based on historic evapotranspiration averages gleaned from meteorological data _ combined with on–site observations _ to devise their irrigation strategies.
3. The hope is farmers can eventually use the lasers to more accurately measure the amount of irrigated farm water lost to evapotranspiration.
4. Other tests involve using satellite imagery to measure "evapotranspiration" _ the amount of water that seeps into the atmosphere from soil surfaces and plants.