What weather conditions do different colors on satellite cloud images represent?

On the black and white infrared satellite cloud picture, we can see that some places are white, some places are black, some places are gray and so on. So what do these colors mean? We know that if the surface of the earth is a clear sky area, the infrared radiation information emitted from the ground into space is observed by satellites, and the satellite cloud picture is black and gray. The darker the black, the stronger the ground radiation and the better the weather. When the sky is covered with clouds and rain, the satellite observes the infrared radiation from the cloud top into space, which is white or grayish white. White indicates that the ground radiation is very weak, the temperature is very low, the cloud satellite image is very thick and dense, and the rainfall intensity is also very high. The transition zone between clear sky area and cloudy and rainy area is usually covered by dark gray, gray and light gray clouds, indicating that there are clouds with different thicknesses and no obvious precipitation. On satellite images displayed on TV, the surface and ocean are usually represented by green and blue.

The visible light cloud pictures taken by meteorological satellites from space are taken by using the scattered light generated by the coarse-grained scattering of sunlight by cloud droplets and ice crystals. White on the cloud image indicates strong sunlight reflection, and gray and black places indicate weak reflection. Because the reflection ability of the land is higher than that of the ocean, the land on the visible light cloud map is gray, the ocean is black, and the area covered by ice, snow and deep clouds is generally white.

One of the advantages of using infrared cloud images is that they can provide information about cloud cover and air mass temperature day and night, while visible light cloud images are only available during the day.

Of course, to accurately explain the information contained in satellite cloud images, it is best to combine the two cloud images.

Satellite cloud image is a picture of cloud conditions received by ground meteorological satellites. According to the orbit of meteorological satellites, it can be divided into polar orbit satellite images and geostationary orbit satellite images. The successive pictures in front are cloud conditions at different positions; The following continuous map represents the continuous situation of clouds in the same range under the satellite. According to the different instruments used by meteorological satellites to obtain cloud conditions, it can be divided into visible satellite cloud images and infrared satellite cloud images.

If the sky above a certain place is clear, what the satellite observes is the infrared radiation information sent from the ground to space, which is black and gray; The darker the black, the stronger the ground radiation, the higher the temperature and the better the weather. When a place is covered by clouds and rain, the satellite observes the infrared radiation information from the cloud top to space, which is white or gray; The whiter the color, the weaker the ground radiation, the lower the temperature, the thicker and denser the cloud system, and the greater the rainfall intensity. The transition area between clear sky area and rainy area is dark gray, gray and light gray cloud system, which indicates that there are clouds with different thicknesses and no obvious precipitation.