Outline the role of atmospheric processes in causing aridity in desert regions. - AQA - A-Level Geography - Question 2 - 2018 - Paper 1
Question 2
Outline the role of atmospheric processes in causing aridity in desert regions.
Worked Solution & Example Answer:Outline the role of atmospheric processes in causing aridity in desert regions. - AQA - A-Level Geography - Question 2 - 2018 - Paper 1
Step 1
Desert Locations
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Deserts are generally located in sub-tropical areas characterized by high pressure. These areas often relate to the tri-cellular model and the convergence of the Hadley cell and the Ferrel cell. This atmospheric setup contributes to aridity.
Step 2
Warm Air Descendence
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Warm descending air leads to evaporation and cloudless skies. This process minimizes chances of precipitation, thus contributing to dry conditions.
Step 3
High Pressure Forces
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The high-pressure systems exert dominance over these regions. Any moisture present is effectively kept at bay by these high-pressure conditions, preventing significant rainfall.
Step 4
Coastal and Ocean Currents
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Some regions may also experience the rain shadow effect, leading to further dryness. Ocean currents can influence aridity as well; if coastal air lacks moisture, regions inland may remain dry.
