PBL height can be derived from satellite GPS RO data. Some papers I have come across on the subject are listed below. However I have no specific information about where this data can be obtained.

von Engeln, A., J. Teixeira, J. Wickert, and S. A. Buehler (2005), Using

CHAMP radio occultation data to determine the top altitude of the planetary boundary layer, Geophys. Res. Lett., 32, L06815, doi:10.1029/2004GL022168

Sokolovskiy, S., Y.-H. Kuo, C. Rocken, W. S. Schreiner, D. Hunt, and R. A.

Anthes (2006), Monitoring the atmospheric boundary layer by GPS radio

occultation signals recorded in the open-loop mode, Geophys. Res. Lett.,

33, L12813, doi:10.1029/2006GL025955.

Sokolovskiy, S., C. Rocken, D. H. Lenschow, Y.-H. Kuo, R. A. Anthes,

W. S. Schreiner, and D. C. Hunt (2007), Observing the moist troposphere

with radio occultation signals from COSMIC, Geophys. Res. Lett., 34,

L18802, doi:10.1029/2007GL030458

Thank you Robert sir..