KATABATIC AND ANABATIC WINDS PDF
Anabatic Winds are upslope winds driven by warmer surface temperatures on a mountain slope than the surrounding air column. Katabatic. Katabatic wind · Local wind system. Anabatic wind, also called upslope wind, local air current that blows up a hill or mountain slope facing the Sun. During the . Katabatic wind (from the Greek: katabaino – to go down) is the generic term for downslope winds These winds are known as valley wind or anabatic wind.
|Published (Last):||6 December 2005|
|PDF File Size:||3.13 Mb|
|ePub File Size:||15.46 Mb|
|Price:||Free* [*Free Regsitration Required]|
Contact our editors with your feedback. These types of winds can reach velocities of up to 4 meters per second. Help us improve this article! Examples for these descending, adiabatically warmed katabatic winds are the Foehn winds. Discover some of the most interesting and dinds topics of More air rises from below to replace it, producing a wind.
Internet URLs are the best. Views Read Edit View history. If the air is cooled sufficiently to reach the air’s dewpoint temperature, the saturated air may condense its water vapour content, resulting in mainly convective clouds. Comments Membership info Register new Login. Most katabatic winds except the Anabaticc are more or less the result of air in contact with upper level ground is cooled by radiation, increases in density, and flows downhill and along the valley bottom.
Glaze and Black Ice. At the bottom of the kattabatic, feel free to list any sources that support your changes, so that we can fully understand their context. Why Skies are Blue. A hill or mountain wihds will be radiatively warmed by the Sun which in turn heats the air just above it. Winds can be derived from a number of different meteorological phenomena that are either caused by large scale synoptic pressure and temperature differences or by local temperature and pressure differences.
Please note that our editors may katzbatic some formatting changes or correct spelling or grammatical errors, and may also contact you if any clarifications are needed. Katabatic anxbatic may range over fairly large areas as in the case of the Santa Anna winds experienced throughout southern California during certain times of the year. Warm, dry katabatic winds occur on the lee side of a mountain range situated in the path of a depression.
Speeds in the mountain—valley anabatic flow layer are often 3—5 m s This page has been accessed 7, times. Banner Cloud – the peak’s flag. Sinds horizontal pressure gradientmaximized at the slope surface, drives an acceleration directed toward the slope, or up the slope.
What Makes Northern Lights Happen? Clouds – sentry of the sky. Thank you for your feedback.
In mountain meteorology, an upslope wind driven by heating usually daytime insolation at the slope surface under fair-weather conditions. Once generated, however, there are many small scale surface structures that can wwinds the wind direction and speed and distort the accuracy of the observing instrumentation.
Weather Facts: Katabatic winds |
Anabatic windalso called upslope windlocal air current that blows up a hill or mountain slope facing the Sun. For example radiation cooling during nighttime can cause a katabatic flow in the early morning when a pool of cold, high elevation air begins to descend beneath warmer, less dense air.
The Editors of Encyclopaedia Britannica. The gentler katabatic flows of hill slopes produce frost hollows. We call these wind modifiers and will talk about them in future blogs.
You may find it helpful to search within the site to see how similar or related subjects are covered. Anabatic wind Written By: There was a problem with your submission. Air masses and their sources. Katabatic wind from the Greek: Isobars on surface maps. These winds typically occur during the daytime in calm sunny anabaitc.
Katabatic and Anabatic Winds
Graphs Climate Finder Travel Planner. Many strong katabatic winds are synoptically triggered or are activated by large scale weather features such as a high pressure system over high elevations, as in Greenland, in California or, for example, the fjords of Norway.
When the lower elevations are hot desert areas the temperature differences can be quite substantial on the order of 60 to 70 degrees Windx. Jan 28, Wind Measurement. The air becomes relatively bouyant and rises up the orographic slope orographic liftresulting in the anabatic flow or wind. This page was last edited on 5 Novemberat Although the pressure-gradient forcing is at its maximum at the slope, surface friction ajd the peak in the anabatic wind speeds to occur above the surface, often by several tens of meters; if the surface heating is strong, abd, the momentum will tend to be vertically mixed.
The greater the temperature difference the stronger the wind. Drifting snow – blowing snow. Wind Atmospheric science stubs.
An anabatic windfrom the Greek anabatosverbal of anabainein meaning moving upward, is a warm wind which blows up a steep slope or mountain side, driven by heating of the slope through insolation.