Why is Changsha so hot?
Deng, chief forecaster of Hunan Provincial Meteorological Observatory, was not surprised that Changsha entered the top four hottest cities. He analyzed that subtropical high, heat island effect and special geographical location are the important reasons for Changsha's extreme heat.
"The subtropical high zone, as its name implies, is located in the subtropical region of the northern and southern hemispheres and is a discontinuous high zone distributed along the latitude circle." Deng said that due to the influence of land and sea, it often splits into several high-pressure monomers, which are called subtropical high, also referred to as "subtropical high". High pressure prevails in downstream, and the weather in most areas is sunny, dry, hot and windless. When it is entrenched for a long time, there will be a serious drought. Changsha, Wuhan, Nanjing and other southern cities often have "stove" weather in summer, and the chief culprit is this subtropical high.
Relevant experts believe that Hunan has a special geographical position, and the east-west Nanling Mountains straddle the border between Hunan and Guangdong, and its existence has an important impact on Hunan's climate. The southerly winds prevailing in summer have a burning effect when crossing Nanling Mountains, and have a strengthening effect on the hot and high temperature in Hunan in summer.
Urban heat island effect is also one of the reasons for the formation of stoves. Due to the acceleration of urbanization, the density of urban buildings and the increase of automobile exhaust emissions, Changsha has stored more heat, leading to an increase in temperature.