Meteorology, what effect does advection have on the trough? What?

The upper trough is a part of atmospheric fluctuation. The development of atmospheric fluctuation is influenced by cold and warm advection. The relationship between temperature and pressure in the atmosphere is an important factor in the change of atmospheric motion.

The specific relationship between cold and warm advection and the development of atmospheric fluctuation ridge is:

High-altitude cold advection, low-altitude pressurization (beneficial to the development of cold and high pressure) and high-altitude decompression are beneficial to strengthen (deepen) the trough.

Warm advection at high altitude, decompression at low altitude (beneficial to the development of low pressure) and pressurization at high altitude are beneficial to the strengthening of ridge line.

Therefore, the influence of cold and warm advection on the development of air pressure system is high and low.

Atmospheric long waves are generally cold trough and warm ridge structure (the fluctuation phase of temperature field lags behind that of pressure field), that is, cold advection behind trough (before ridge) and warm advection before trough (behind ridge), so the long wave trough will deepen and the long wave ridge will strengthen. At this time, atmospheric baroclinic is unstable, cold air sinks, warm air rises, and the weather changes dramatically.