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Class 4a: Atmospheric moisture
Introduction to water Earth’s temperature special properties of water
Introduction to water Energy needed to change state
Evaporation How does water evaporate?
Evaporation Water vapor stores latent heat Vapor pressure: pressure exerted by water vapor
Evaporation How quickly does water evaporate?
Humidity Absolute humidity: ratio of water vapor to a given volume of air Specific humidity: ratio of water vapor to a given mass of air
Humidity Relative humidity: ratio of water vapor to maximum water vapor capacity
Dew point When air cools, water vapor capacity _____ and relative humidity _____
Condensation Condensation: water vapor becomes liquid, releases latent heat
Lapse rates Normal lapse rate: 3.5°F/1000 feet
Adiabatic processes Air changes temperature by convection, not conduction
Adiabatic processes If a rising parcel of air cools to its dewpoint, then ______ occurs
Stability of air Buoyancy: tendency of an object to rise
Stability of air
Stability: normal lapse rate of surrounding air is less than DALR
Stability of air Unstable air: normal lapse rate of surrounding air is greater than DALR
Stability of air Conditionally unstable air: stable up to a point
Stability of air
Chapter 4 Moisture and Atmospheric Stability
Chapter 5 Atmospheric Moisture. The process whereby molecules break free of liquid water is known as evaporation. The opposite process is condensation,
Lapse Rates & Stability Learning outcomes: - What are condensation nuclei? - What is the difference between DALR & SALR? - What are the different states.
Atmospheric Humidity. Global water cycle: precipitation = evaporation.
PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART INTRODUCTION:
Chapter 27 - Clouds Use of Power Point design and animations with permission from Dr. Joby Hilliker ( West Chester University, West Chester, PA.
Weather Water in the Atmosphere May 14, Precipitation Precipitation is any form of water that falls from a cloud. Water vapor is the source of all.
Chapter 3 Water in the atmosphere. 3.1 Introduction Water: only 0 to 4% by volume No water no rainbow No water no thunderstorm No water no life.
Tephigrams ENVI1400 : Lecture 8.
Textbook chapter 2, p chapter 3, p chapter 4, p Stability and Cloud Development.
Outline Further Reading: Chapter 06 of the text book - stability and vertical motions - five examples - orographic precipitation Natural Environments:
Humidity, Saturation, and Stability
Moisture and Atmospheric Stability
Atmospheric Moisture and Stability
Water in the Atmosphere Water vapor in the air Saturation and nucleation of droplets Moist Adiabatic Lapse Rate Conditional Instability Cloud formation.
Atmospheric Moisture Tutorial Start.
Property of Lear Siegler ATMOSPHERIC STABILITY & CLOUDS Property of Lear Siegler.
Lapse Rates and Stability of the Atmosphere
Warm Up 3/14 Which gas is most important for understanding atmospheric processes? a. water vapor c. carbon dioxide b. oxygen d. ozone What is true.
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