Liang, X.; Tian, B.; Yu, P.; Ge, J.; Ning, Y., and Teng, L., 2020. Universal functions of relative humidity and temperature profiles in the South China Sea. In: Zheng, C.W.; Wang, Q.; Zhan, C., and Yang, S.B. (eds.), Air-Sea Interaction and Coastal Environments of the Maritime and Polar Silk Roads. Journal of Coastal Research, Special Issue No. 99, pp. 263–269. Coconut Creek (Florida), ISSN 0749-0208.

Accurate prediction of evaporation duct is of great significance to improve the performance of some electronic equipment. And the universal function scheme of potential temperature and specific humidity is the key factor. To analyse the fitting effect of the universal function schemes in the South China Sea, five universal function schemes (BD74, SHEBA07, NWA, RSHMU and AT2005) were selected in this paper, and the actual data of a meteorological gradiometer from February to December 2018 were used. The results showed that: (1) under the stable condition, the standard deviation and gradient standard deviation of SHEBA07 scheme were the minimum, and AT2005 scheme were the minimum under the unstable condition, so it was suggested that SHEBA07 scheme be used under the stable condition and AT2005 scheme under the unstable condition; (2), RSHMU scheme was not suitable for the South China Sea under the unstable condition. And further study will be carried out to optimize the chosen schemes.