Atmospheric science 1001
Atmospheric science 1001 ATMS 1001- 40068
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This 2 page Class Notes was uploaded by Oreoluwa Notetaker on Friday September 23, 2016. The Class Notes belongs to ATMS 1001- 40068 at University of Louisiana at Monroe taught by Dr. Anne Case Hanks in Fall 2016. Since its upload, it has received 5 views. For similar materials see Atmospheric Science in Atmospheric Science at University of Louisiana at Monroe.
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Date Created: 09/23/16
ATMOSPHERIC SCIENCE Chapter 4 (first part) . Evaporation = LIquid water to water vapor or gas . Condensation = When the water vapor changes back into liquid forming clouds . Under certain conditions , the liquid (or solid ) cloud particles may grow in size and fall to the surface as precipitation ie rain ,snow or hail . .If precipitation falls into an ocean the water is ready to begin it cycle again but if it falls on a continent a great deal of water returns to the ocean in a complex journey . . Cycle of moving and transforming water molecules from liquid to vapor and back to liquid again is called the hydrologic cycle . . Even plants give up moisture by a process called transpiration . . Saturation (of air) : An atmospheric condition whereby the level of water vapor is the maximum possible at the existing temperature and pressure . . Humidity : refers to any one of a number of ways of specifying the amount of water vapor in the air . Humidity is basically determined by the amount of water in the air . . Vapor Pressure : The partial pressure of water vapor . Also known as actual vapor pressure . Everything else being equal , the more air molecules in a parcel the greater the total air pressure High actual vapor pressure indicates large numbers of water vapor molecules , whereas low actual vapor pressure indicates comparatively small number of vapor molecules . . Saturation vapor pressure : Describes how much water vapor is necessary to make the air saturated at any given temperature . At higher temperatures it takes more water vapor to saturate the air . Saturation vapor pressure then depends primarily on the air temperature . . Relative humidity : Most commonly used way of describing atmospheric moisture . Relative humidity is the ratio of the amount of water vapor actually in the air to the maximum amount of water vapor required for saturation at that particular temperature (and pressure ) . RH = ctual vapor pressure x 100 Water vapor capacity . Condensation takes place in saturated air . Therefore , as more and more water vapor molecules are added to the air , the air gradually approaches saturation and the relative humidity of the air increases . Conversely, removing water vapor from the air decreases the likelihood of saturation which lowers the air’s relative humidity . . CHANGE IN RELATIVE HUMIDITY CAN BE BROUGHT ABOUT BY : A) By changing the air’s water vapor content B) By changing the air temperature . Air with a 100 percent relative humidity is said to be saturated because it is filled to capacity with water vapor . Air with a relative humidity greater than 100 percent is said to be supersaturated
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