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Unformatted text preview: Lab Instructions - AOS 330 More Meteorological Measurements and Observations 1 Objectives • Learn to use a sling psychrometer to measure dry-bulb and wet-bulb temperature. • Learn to convert the above measurements to dewpoint and relative humidity. • Introduction to sky, visibility, and present weather observations. 2 Materials and Equipment • Sling psychrometer with built-in slide rule (eight in cabinet in main office) • Bottle of distilled water • Thermodynamic diagram (e.g., Skew-T) • Psychrometer handout • Normand’s Rule handout • Humidity table • Cloud chart • Cloud cover estimation handout • Cloud identification handout 3 Part I 3.1 Introduction Temperature and humidity are important not only because they have a strong effect on human comfort, agriculture, etc., but also because of their importance for atmospheric dynamics and energetics. Without temperature differences, there would be no pressure differences and thus no wind. Without atmospheric moisture there would be no clouds or precipitation....
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- Fall '07
- Atmospheric thermodynamics, Psychrometrics, fog, Hygrometer