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Week 7 Notes

by: Savannah Notetaker

Week 7 Notes metr 121

Savannah Notetaker

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About this Document

These notes cover fog, haze, and an introduction to cloud types.
Rezaul Mahmood
Class Notes
Meteorology, fog, haze, clouds, advection, horizontal, transfer, condensation
25 ?





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This 2 page Class Notes was uploaded by Savannah Notetaker on Thursday October 6, 2016. The Class Notes belongs to metr 121 at Western Kentucky University taught by Rezaul Mahmood in Fall 2016. Since its upload, it has received 4 views. For similar materials see METEOROLOGY in Science at Western Kentucky University.


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Date Created: 10/06/16
Meteorology Week #7 10-3-16 DEW POINT TEMPERATURE: for a given pressure and water vapor content, the temperature to which air has to be cooled for saturation to occur. When Dew Point Temp. goes up, there is more moisture in the atmosphere. The only way to change DPT is by changing the amount of water vapor in the air. Dew Point Depression: T-Td Large Dew point Depression= Low Relative Humidity Small Dew point Depression= High Relative Humidity When T=Td, air is saturated Air Temperature is never less than dew point temperature HUMIDITY MEASURE: remote sensing, hydrometers (sling psychrometer) Condensation Nuclei: size of nuclei ranges from 0.1 um to 1um lightweight- suspended for long periods of time Hydroscopic: Water Seeking Hydrophobic: Water repelling Condensation Near Ground: dew, frozen dew, frost Condensation in sky: haze, fog, clouds Dew: • Nighttime radiation cooling of ground and lower atmosphere, often cools to Td • Further cooling produces condensation onto surrounding surfaces Frozen Dew: • Layer of dew • further cooling air, temp reaches freezing Frost: • Dew point temperature at freezing or below • Air cools down to this low dew point temperature • deposition of vapor on ice occurs directly without condensing to liquid first • clear calm nights needed Haze: tiny water droplets suspended in the air • • RH is 75%, below 100% • mostly the hydroscopic nuclei works with unsaturated (75%) air • large enough droplets to scatter visible light Fog: • As RH approaches 100%, haze particles grow large • Liquid droplets come discernible, visibility is obscured 10-5-16 Types of Fog: there are generally two ways to form 4 types of fog. Cooling to Saturation: Radiation Fog: occurs when surface air cools by radiation forms first at surface, thickens as cooling continues very light breeze brings moist air upslope fog Advection fog: horizontal transfer of heat brings the air to a colder surface common along the west coast Upslope fog: travels upslope along hillside, mountains Evaporation: cold air blows over warm water surface evaporation adds vapor to raise the dew point cold air becomes saturated -breath fog Clouds: High Clouds: cirrus cirrostratus cirrocumulus Low Clouds: stratus stratocumulus nimbostratus Middle: altostratus altocumulus Vertical: cumulus cumulonimbus Mammatus: cloud pouches Lenticular Clouds: sandwich clouds on mountains Jet contrail: condensation trails behind jets


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