A region currently has a mean annual temperature of $20^{\circ}\text{C}$ and receives $900$ mm of precipitation per year. For the purpose of a simplified climate‑type rule, the region is classified as humid when $P 20\times T$ (where $P$ is annual precipitation in mm and $T$ is mean annual temperature in °C). Climate change raises the temperature by $3^{\circ}\text{C}$ and reduces each month's precipitation by 55 %. After these changes, what is the new climate classification? Then calculate the minimum uniform percentage increase in precipitation (applied to the reduced values) that would be required to retain the original humid classification.

Question

A region currently has a mean annual temperature of $20^{\circ}\text{C}$ and receives $900$ mm of precipitation per year. For the purpose of a simplified climate‑type rule, the region is classified as humid when $P > 20\times T$ (where $P$ is annual precipitation in mm and $T$ is mean annual temperature in °C). Climate change raises the temperature by $3^{\circ}\text{C}$ and reduces each month's precipitation by 55 %. After these changes, what is the new climate classification? Then calculate the minimum uniform percentage increase in precipitation (applied to the reduced values) that would be required to retain the original humid classification.

Accepted Answer

Semi‑arid; at least 14 % increase in precipitation required

Gce Model Questions Vol1 2025 Geography Question 43

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