remove TC signal from original fields
References:
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——, ——, R. E. Tuleya, and R. J. Ross, 1995: Improvements in the GFDL Hurricane Prediction System. Mon. Wea. Rev., 123, 2791–2801, doi:10.1175/1520-0493(1995)123<2791:IITGHP>2.0.CO;2.
Feng, T., X.-Q. Yang, W. Zhou, R. Huang, L. Wu, and D. Yang, 2016: Synoptic-Scale Waves in Sheared Background Flow over the Western North Pacific. J. Atmos. Sci., 73, 4583–4603, doi:10.1175/JAS-D-16-0064.1.