How about the structure of inflow layer in the outer circulation of tropical cyclones?
This is a great question, but I do not have a simple answer. I studied tropical cyclones for 5 years and spent 3 years at the Joint Typhoon Warning Center in Guam. There is massive convergence at the surface and massive divergence at the top. This is a 3-dimensional issue, where the transition from inflow to outflow occurs throughout the vertical structure of the cyclone. You will need actual wind data to study this. Unfortunately, the United States stopped aircraft investigations in the West Pacific in the 80s, but you may be able to obtain flight records of historical aircraft penetrations of cyclones.
It is not easy to clearly identify PBL height in the tropical cyclone(TC) partly due to its interaction with the underling sea surface or land surface during the TC's lifetime. On average, observation and modeling data show that tangential winds have their maximum near 850 hPa level and radial winds change their direction near 850 hPa. The radial winds blowing into the TC's center is strong near 950 hPa. In general, we can say that the top of inflow layer equals the PBL height which is changing.
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