What meteorological observation instruments are there in the weather station?

Generally speaking, there are two kinds of observation methods of ground weather stations: one is visual observation, which relies on people's eyes to observe some meteorological elements, such as cloud shape, cloud amount, visibility and weather phenomena in the sky. The other is instrument measurement, which uses instruments to measure the temperature, humidity, air pressure and wind force in the atmosphere. Automatic weather stations are also installed in mountainous areas, islands and wasteland that are not suitable for human activities. The contents and methods of observation by ground weather stations are implemented according to the observation specifications formulated by the United Nations World Meteorological Organization and China Meteorological Bureau, four times a day, with the time of 00: 06: 12: 18 UTC. Some weather stations observe it eight times a day, and some even observe it once every hour/kloc-0. It is required that the performance, specifications and measurement units of instruments should meet international standards to ensure the accuracy, representativeness and comparability of data. Temperature, humidity, air pressure and wind are the main observation items of the weather station. These meteorological elements are the basic physical quantities representing the characteristics of the atmosphere, and they reflect the thermal and dynamic conditions of the atmosphere. Temperature is a physical quantity to observe the air temperature, which is measured by a mercury or alcohol glass thermometer placed in a white louver, and the unit of measurement is degrees Celsius. Humidity is a physical quantity representing air humidity. Generally, it is measured by a dry-wet thermometer or a hair hygrometer in a louver, which is often converted into relative humidity, water vapor pressure or dew point temperature. Air pressure is a physical quantity representing atmospheric pressure. Measured by mercury barometer, and the unit of measurement is expressed in hectopascals. Wind is a physical quantity reflecting the movement of air. It is measured by an electric wind direction anemometer installed on a wind pole with a height of 10. The unit of wind is meters per second. The wind direction is indicated by 8 directions or 16 directions. In addition to the above observation items, the ground weather station should also observe rainfall, evaporation, sunshine, ground temperature, snow and frozen soil. Some weather stations also observe solar radiation.