Flashcards in Ch 1 - Atmosphere Deck (21):
Which gasses make up the atmosphere?
1% Other Gasses (0.95% Argon)
Constant up to 60km
What is the variance of water vapour in the atmosphere?
0% - 4%
What causes water vapour in the atmosphere ro vary?
What does Ozone absorb?
Short-wave solar radiation
What does Carbon Dioxide absorb?
Long-wave terrestrial radiation
What is ISA and why is it used?
ICAO International Standard Atmopshere
The ensure standardisation amongst aviation instruments.
What is ISA mean sea level pressure?
What is ISA mean sea level temperature?
What is ISA mean sea level density?
What is the ISA temperature lapse rate up to 11km, from 11km - 20km, and from 20km - 30km
11km: -2 c / 1,000 ft
11km - 20km: Constant -56.5 c
20km - 32km: +0.3 c / 1000 ft
Calculate ISA temperature for a given altitude?
15 - ( 2 x (altitude in ft / 1,000) )
What happens to temperature, pressure and density as altitude increases?
All get lower
Calculate ISA Deviation?
OAT - ISA Temperature
Describe the main characteristics of the Troposphere
- Atmopshere up to Tropopause
- 3/4 air in the atmosphere by weight
- Temperature decreases with height
- Containts nearly all weather / most water
vapour more abundant
Heights and temperatures of Tropopause on average?
Equator: 16km -75 c
Mid-Latitudes: 11km -56.5 c
Polar: 8km -40-50 c
What are breaks in the Tropopause?
Abrupt changes in Tropopause height
What causes breaks in the Tropopause?
Can you draw the half-globe cell/wind diagram?
Hadley Cell, Farrel Cell, Polar Cell, Trade Winds, Sub-Tropical High Pressure Belt, Polar Fronts
Why do the trade winds exist?
The Earth is moving.
Describe main characteristics of the Stratosphere
- Above the Tropopause
- Constant temperature -56.5 c
- Contains the Ozone Layer (20 - 50km)