Ch 1 - Atmosphere Flashcards Preview

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Flashcards in Ch 1 - Atmosphere Deck (21):
1

Which gasses make up the atmosphere?

21% Oxygen
78% Nitrogren
1% Other Gasses (0.95% Argon)

Constant up to 60km

2

What is the variance of water vapour in the atmosphere?

0% - 4%

3

What causes water vapour in the atmosphere ro vary?

- Altitude
- Location
- Temperature

4

What does Ozone absorb?

Short-wave solar radiation

5

What does Carbon Dioxide absorb?

Long-wave terrestrial radiation

6

What is ISA and why is it used?

ICAO International Standard Atmopshere

The ensure standardisation amongst aviation instruments.

7

What is ISA mean sea level pressure?

1,013.25 hPa

8

What is ISA mean sea level temperature?

+15 c

9

What is ISA mean sea level density?

1,225 g/m3

10

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

11

Calculate ISA temperature for a given altitude?

15 - ( 2 x (altitude in ft / 1,000) )

12

What happens to temperature, pressure and density as altitude increases?

All get lower

13

Calculate ISA Deviation?

OAT - ISA Temperature

14

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

15

Heights and temperatures of Tropopause on average?

Equator: 16km -75 c
Mid-Latitudes: 11km -56.5 c
Polar: 8km -40-50 c

16

What are breaks in the Tropopause?

Abrupt changes in Tropopause height

17

What causes breaks in the Tropopause?

Temperature

18

Can you draw the half-globe cell/wind diagram?

Hadley Cell, Farrel Cell, Polar Cell, Trade Winds, Sub-Tropical High Pressure Belt, Polar Fronts

19

Why do the trade winds exist?

The Earth is moving.

20

Describe main characteristics of the Stratosphere

- Above the Tropopause
- Constant temperature -56.5 c
- Contains the Ozone Layer (20 - 50km)

21

Describe the Greenhouse Effect

Greenhouse gasses do not absorb incoming short-wave solar radiation, but do absorb outgoing terrestrial long-wave radiation. Terrestrial radiation is re-radiated, resulting in additional warming on the surface.