ENA/PBLHT/C1-Oceanic Site Planetary Boundary Layer Heights (PBLHs) from Radiosondes - 
Possible Issue

Automated methods for estimating PBLHs from radiosonde data may in some instances be 
identifying shallow stable layers over island surfaces as the PBLH. Insufficient data exists 
at this time to modify the automated algorithms to resolve this situation. Reported 
oceanic site PBLHs of <100 m, particularly at night, should be used with caution.

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• Planetary boundary layer height above mean sea level calculated from bulk
  Richardson number using critical threshold of 0.25(pbl_height_bulk_richardson_pt25)
• Planetary boundary layer height above mean sea level calculated from bulk
  Richardson number using critical threshold of 0.5(pbl_height_bulk_richardson_pt5)
• Planetary boundary layer height above mean sea level calculated by Liu and Liang
  (2010) method(pbl_height_liu_liang)
• Planetary boundary layer height above mean sea level calculated using the
  Heffter (1980) method(pbl_height_heffter)

• Planetary boundary layer height above mean sea level calculated from bulk
  Richardson number using critical threshold of 0.25(pbl_height_bulk_richardson_pt25)
• Planetary boundary layer height above mean sea level calculated by Liu and Liang
  (2010) method(pbl_height_liu_liang)
• Planetary boundary layer height above mean sea level calculated from bulk
  Richardson number using critical threshold of 0.5(pbl_height_bulk_richardson_pt5)
• Planetary boundary layer height above mean sea level calculated using the
  Heffter (1980) method(pbl_height_heffter)