Investigation on Global Distribution of the Atmospheric Trapping Layer by Using Radio Occultation Dataset

The trapping layer refers to the atmospheric with vertical gradient of refractivity less than −157 N-Units/km or modified 0 M-unit/km, which has a significant impact on radar and radio communication systems. Based COSMIC other occultation data, we show statistical characteristics global during 2005–2020.The results that occurrence rate layers is mainly concentrated between 50°S 50°N, higher occurrences more 50% occur in boundary area ocean land, such as northwest coastal Mexico, west Africa, Mediterranean Sea, Red Sea Arabian Australia, etc. altitude lower near land increases distance away from coastline. intensity 6 M-unit 24 (an unit refractivity), average value some regions above M-unit, area. In addition, thickness 50 240 m, generally larger over land. These reveal generation result interaction various background environmental factors radiation band migration, trade winds, monsoons, solar heating, sea–land breezes so on.