델리의 날씨: 온도계가 보여주는 것보다 더 뜨거운 이유

Delhi, one of India's largest cities, recently faced extreme heat. The official temperature reached 43.5 degrees Celsius. Despite this already dangerous level, many residents reported that the heat felt much worse. Scientists decided to investigate this mystery using special equipment.

A research team brought thermal cameras into Delhi to study the problem. These cameras detect heat that human eyes cannot see. The team recorded temperatures on different surfaces throughout the city. They measured roads, building walls, and other structures. The results were striking and important for understanding urban heat.

Roads and pavements showed the highest temperatures. Dark asphalt surfaces absorbed sunlight all day long. When the sun was strongest, these surfaces reached temperatures far above 43.5°C. Some areas showed surface temperatures exceeding 60°C. These extremely hot surfaces then released heat into the air around them. People standing or walking on these roads felt this intense radiation directly.

Buildings in the city also contributed to the problem. Concrete and metal walls absorbed heat during daylight hours. These materials then slowly released the absorbed energy throughout the day and into the evening. This process created what scientists call the "urban heat island effect." In cities, temperatures are often several degrees higher than in surrounding rural areas. Buildings, roads, and reduced vegetation all cause this difference.

The thermal camera study showed clear patterns. In busy downtown areas with many buildings and roads, the feeling of heat was strongest. In parks or near water, temperatures felt noticeably cooler. This demonstrates how urban design directly affects human comfort and health.

The research has practical implications for Delhi's residents. City officials can use this information to plan improvements. Adding more trees and green spaces helps. Painting roofs white or light colors reduces heat absorption. Better urban planning can lower temperatures significantly. These solutions require cooperation between government, builders, and residents.

Understanding the difference between air temperature and surface temperature is crucial in a warming world. As cities grow larger and hotter, this knowledge becomes increasingly important. Delhi's thermal camera study provides valuable lessons for other cities facing similar challenges.

Inspired by reporting from BBC News.