This analysis reveals how orographic gravity wave drag reduces cold vortex intensity, affecting moisture transport and rainfall patterns.
Key Points
The study demonstrates that orographic gravity wave drag parameterization reduces heavy rainfall estimates in cold vortex events over the Yanshan Mountains.
Simulations show that OGWD can weaken cold vortex circulation and moisture transport, leading to less severe rainfall in certain areas.
Utilizing a revised OGWD scheme that incorporates nonhydrostatic effects mitigates spurious rainfall significantly.
Findings suggest that proper parameterization of OGWD is crucial for accurate simulations in high-resolution numerical models.