Asked in Needs a Topic
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What Evapotranspiration is the process of?
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Asked in Chemistry, Evaporation and Condensation
When water evaporates from leaf this process is called?
Asked in Botany or Plant Biology
Plants release water vapor into the air by the process of?
Asked in Botany or Plant Biology
What is the process when water vapour leaves leaf cells?
Asked in History of Science, Soil
What term is defined as the movement of water from plants soils and oceans into the atmosphere?
Asked in Science, Definitions
Evapotranspiration during a storm is significant?
Evapotranspiration refers to the combined process of water surface evaporation, soil moisture evaporation, and plant transpiration. It is significant during a storm because the stormwater from evapotranspiration is a water budget component for wetlands, wet ponds, and other stormwater treatment practices.
Asked in Rain and Flooding, Water Cycle
What does evapotranspiration mean in the water cycle?
What are the processess of evapotranspiration?
Evaporation (E), from the hydrological point of view, is the process in which water from open water surfaces (oceans, seas, lakes and rivers), from uncovered soil and from surfaces covered by snow and glaciers goes into the atmosphere in vapour state. [Musy, 2001] Transpiration is the process in which a fraction from the water assimilated by vegetation is set free into the atmosphere in vapour state. Evapotranspiration (ET) is the sum of these two processes, evaporation and transpiration. So the evapotranspiration is the total quantity of water, in the shape of vapour, transferred from atmosphere, hydrosphere, biosphere, lithosphere and anthroposphere.
Does Precipitation exceed evapotranspiration in a desert?
Asked in Botany or Plant Biology
What are the two main types of plant transpiration process?
Evapotranspiration and the Hydrologic Cycle Evapotranspiration is important to the hydrologic cycle because it represents a considerable amount of moisture lost from a watershed. As precipitation falls and soaks into the soil, a plant absorbs it and then transpires it through its leaves, stem, flowers, and/or roots. When this is combined with the evaporation of moisture that was not directly absorbed by the soil, a significant amount of water vapor is returned to the atmosphere. Through evapotranspiration and the hydrologic cycle, forests or other heavily wooded areas typically reduce a location's water yield. Factors Affecting Evapotranspiration As part of the hydrologic cycle, there are several factors affecting a plant's rate of transpiration and therefore evapotranspiration. The first of these is air temperature. As temperatures increase, transpiration also goes up. This occurs because as warmer air surrounds a plant, its stoma (the openings where water is released) open. Cooler temperatures cause the stoma to close; releasing less water. This lowers the rate of transpiration. As evapotranspiration is the sum of transpiration and evaporation, when transpiration decreases, so too does evapotranspiration. Relative humidity (the amount of water vapor in the air) is also an important consideration in evapotranspiration rates because as the air becomes more and more saturated, less water is able to evaporate into that air. Therefore, as the relative humidity increases transpiration decreases. The movement of wind and air across an area is the third factor affecting evapotranspiration rates. As the movement of air increases, evaporation and transpiration does as well because moving air is less saturated than stagnant air. This is because of the movement of air itself. Once saturated air moves, it is replaced by drier, less saturated air which can then absorb water vapor. The moisture available in a plant's soil is the fourth factor affecting evapotranspiration because when soil is lacking moisture, plants begin to transpire less water in an effort to survive. This in turn decreases evapotranspiration. The final factor affecting evapotranspiration is the type of plant involved in the transpiration process. Different plants transpire water at different rates. For example, a cactus is designed to conserve water. As such, it does not transpire as much as a pine tree would because the pine does not need to conserve water. Their needles also allow water droplets to gather on them which is later lost to evaporation in addition to the normal transpiration. Geographic Patterns of Evapotranspiration In addition to the five factors mentioned above, evapotranspiration rates are also dependent upon geography, namely, an area's latitude and climate. Regions on the globe with the most solar radiation experience more evapotranspiration because there is more solar energy available to evaporate the water. These are generally the equatorial and subequatorial regions of the earth. Evapotranspiration rates are also highest in areas with a hot and dry climate. In the Southwest United Statesfor instance, evapotranspiration is about 100% of the total precipitation for the area. This is because the area has a large amount of warm, sunny days throughout the year paired with little precipitation. When these combine, evaporation is at its highest. By contrast, the Pacific Northwest's evapotranspiration is only about 40% of yearly precipitation. This is a much colder and wetter climate so evaporation is not as prevalent. In addition, it has a higher latitude and less direct solar radiation. Potential Evapotranspiration Potential evapotranspiration (PE) is another term used in the study of evapotranspiration. It is the amount of water that could evaporate and transpire under conditions with adequate precipitation and soil-moisture supply. It is usually higher in the summer, on sunny days, and at latitudes closest to the equator due to the aforementioned reasons. Potential evapotranspiration is monitored by hydrologists because it is useful in predicting the evapotranspiration of an area and as it usually peaks in the summer, it is helpful in monitoring potential drought situations. Potential evapotranspiration combined with examining the factors contributing to actual evapotranspiration gives hydrologists an understanding of what an area's water budget will be after water is lost to this process. Because so much water is lost and drought is always a concern for many areas around the globe, evapotranspiration is an important topic in the study of both physical and human geography.
Asked in Math and Arithmetic
What is a climate ratio?
Climate ratio is used to describe the moisture side of climate. It compares the precipitation (P) with the potential evapotranspiration (Ep) for a region. One way to do this is to express the relationship between them as a ratio using the formula: Climate ratio = P / Ep When the potential evaporation is greater than yearly precipitation, this ratio is less than 1. When precipitation is greater than evapotranspiration, the ratio is greater than 1. P: precipitation (in mm) or the amount of moisture available for evapotranspiration, evapotranspiration is the combined process of evaporation and plant respiration. Ep: potential evapotranspiration (in mm) or the amount of moisture needed for evapotranspiration. This value increases as temperature and plant life increase. The climate ratios are used to determine climate type: P/Ep: Less than 0.4: arid climate 0.4 - 0.8: semiarid climate 0.8 - 1.2: subhumid climate Greater than 1.2: humid climate Source: NOAA
Asked in Earth Sciences
What are two sources of moisture for a water budget?
Asked in Biology, Lakes and Rivers
What is a condition necessary for a river system to form?
How does increased evapotranspiration effect the earth?