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Diesel Generator | Diesel Generator Price / 2012-08-02
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Netizens suspect weather forecast “cooled†forecast 36°C self-test 62.4°C
Yesterday, the netizen @ Wang Kai, the top of the building, reported to the newspaper official Bo: At 13:50 on the same day, an infrared instrument was used to measure temperature on a high building near Nanhu, and the ground temperature reached 62.4°C.
After the microblogging was issued, many netizens commented that the weather in the near future has lasted for more than 10 days. The meteorological department forecasts daily temperatures around 36°C, which is inconsistent with the actual situation.
With the doubts of netizens, this reporter yesterday walked into the Municipal Meteorological Observatory and invited experts to collect meteorological data and analyze the summer climate characteristics of Wuhan City, explaining why there is a gap between the standard temperature of the meteorological department and the temperature of the residents.
The temperature forecast data is mainly collected by the sensors of the automatic weather station and the shutter box in the observation field of the artificial weather station, and has the standard meteorological detection environment requirements. For example, the shutter box should be placed 1.5 meters above the ground, and meet the conditions of ventilation, low humidity, and direct sunlight. According to the data collected by the screen box, the meteorological station makes a forecast of the temperature, which is called "standard temperature" in meteorology.
Because it is difficult for Wuhan to meet the requirements for the establishment of a national basic meteorological observation station, the meteorological observation station is located at Cihui Farm, Dongxihu District. The station is a representative meteorological observation station in Wuhan and the measured meteorological data participate in the global exchange.
Due to the large area of ​​the three towns and the slight difference in the microclimate, the “sunrise at the west of the east†often occurs. In addition, the standard temperature and the actual measurement conditions of the public are different, so there is a data gap.
The meteorological department said that after the sunny surface baking in summer, the temperature is much higher than the temperature. When the temperature is 35°C, the temperature of the surface land can reach 40°C or more, and the temperature of the road can reach 50°C or more. For people traveling outdoors, the temperature of the body tends to exceed the forecast temperature.
The weather forecast is the standard temperature, and the temperature that people actually sense is called the body temperature. Both are different concepts.
Weather experts say that body temperature is not equal to the standard temperature. People's somatosensory temperature will vary with the environment, individual's physical condition, and personal status (sports, rest, emotions, etc.).
In terms of environment, the factors affecting people's somatosensory temperature mainly include urban heat island effect, population density, vehicle density, building density, pavement materials (tar, cement, lawn, etc.), sunshine, and air humidity.
In addition, due to improved living conditions, air-conditioning and other cooling facilities are commonly used. From the cool indoor and outdoor areas, the contrast between body temperature and temperature will become increasingly hot outside.
The meteorological department explained that the three major natural conditions caused Wuhan to stay up all night, making people feel generally uncomfortable.
Wuhan is surrounded by mountains on three sides and exposed in the south. It is in a "concave" shape. The southeastern winds in summer brought warm and humid air to Wuhan, and the mountains allowed heat to accumulate in Wuhan City. Therefore, many people feel that the wind blowing in Wuhan in the summer is hot.
Wuhan is one of the places where the subtropical high-pressure likes to entrench, and it has been in a sinking air flow for a long time. The wind is weak. At the same time, the solar radiation is also more likely to reach the ground. The temperature starts to soar in less than noon.
A large area of ​​water warms the night in Wuhan. The lake absorbs heat during the day and releases a lot of heat at night. It also adds humidity to the air and creates a "sauna" effect.
Meteorologists explained that some cities in China forecast that the temperature is higher than Wuhan, but the human body feels that there is no Wuhan heat. The reason is that Wuhan has special natural conditions.
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