Improved Calibration Method For CML Humidity Retrievals Over Complex Terrain

The use of commercial microwave links (CMLs) as a tool for measuring atmospheric humidity has emerged as a promising new technique for environmental monitoring. CML-based humidity retrieval utilizes the attenuation of microwave signals caused by water vapor to estimate humidity, offering several advantages over traditional sensing techniques such as low cost, high spatial and temporal resolution, and coverage over a wide range of areas. This article discusses the calibration method for determining the base line for CML humidity observations, based on assumptions from the atmospheric sciences field, enabling the use of CMLs over a wide and complex terrain area. With continued development, CMLs are likely to become an increasingly valuable tool for weather forecasting, climate monitoring, and other environmental studies.