Planetary Boundary Layer Heights from Cruises in Spring to Autumn Chukchi-Beaufort Sea Compared with ERA5

The planetary boundary layer height (PBLH) is a diagnostic field related to the effective heat capacity of lower atmosphere, both stable and convective, it constrains motion in this as well impacts surface warming. Here, we used radiosonde data from five icebreaker cruises Chukchi Beaufort Seas during spring fall derive PBLH using bulk Ri method, which were then compared with results ERA5 reanalysis. was similar but slightly than ship observations. Clear consistent seasonal changes found observations reanalysis: decreased mid-May mid-June subsequently increased after August. comparison shows that, besides temperature, biases are also function wind direction, suggesting that availability upwind important representing processes active over Arctic Ocean.