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How are dry climate regions identified?
In The Online World It Says That, "They are usually identified by having a low precipitation to potential evapotranspiration (P/PET) ratio."
What term is defined as the movement of water from plant soil and ocean into atmosphere?
This process is called evapotranspiration.
How can precipitation and potential evapotranspiration data be used to identify climatic regions?
if the precipitation is higher than the p/Ep then the climate is humid. if the precipitation is lower than the P/Ep then the climate is arid.
What is a condition necessary for a river system to form?
Precipitation exceeds evapotranspiration.
What are the two main types of plant transpiration process?
Evapotranspiration and the Hydrologic CycleEvapotranspiration 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 EvapotranspirationAs 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 EvapotranspirationIn 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 EvapotranspirationPotential 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.
What does D mean on a water budget?
D -deficit Ea- actual evapotranspiration St-storage S-surplus P-precipitation Ep- potential evapotranspiration P-Ep- Precipitation - Potential Evapotranspiration
What is the potential evapotranspiration ratio?
The potential evapotranspiration concept was first introduced in the late 1940s and 50s by Penman and it is defined as " the amount of water transpired in a given time by a short green crop , completely shading the ground , of uniform height and with adequate water status in the soil profile ". Note that in the definition of potential evapotranspiration , the evapotranspiration rate is not related to a specific crop .
When is potential evapotranspiration the highest?
during summer when temperatures are higher.
What causes potential evapotranspiration to change?
Average surface temperature
What are two sources of moisture for a water budget?
precipitation and potential evapotranspiration
What causes the potential evapotranspiration to vary from month to month?
Temperature change within the months
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
Which condition most likely exists when precipitation is greater than potential evapotranspiration and soil water storage is at the maximum?
run off
How do you calculate climatic water balance?
The Climatic Water Balance (CWB) results from the Precipitation (actual) minus Evapotranspiration (potential) Climatic Water Balance is actual Precipitation minus potential Evapotranspiration CWB=P-PET Exp: PET= 16.09 mm/month P= 46 mm/month CWB=46-16.09 =29.91 mm/month
How are dry climate regions identified?
In The Online World It Says That, "They are usually identified by having a low precipitation to potential evapotranspiration (P/PET) ratio."
What is the definition of evappotranspiration?
evapotranspiration
What is a source of enegry for evapotranspiration?
sunlight
