PBLHPlanetary Boundary Layer Height
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To produce a single pollution-calibrated instrumental variable, we combined information from PBLH, atmospheric pressure, and wind speed on the day of death (lag 0) and the day before death (lag 1).
Until now, the maximum variance method is the main method for estimating the PBLH from CALIOP observations; little research has focused on the combination of these two methods.
Sections 2 and 3 present the data and the method of estimates and analysis of PBLH, respectively.
In order to avoid the influence of the residual layer during nighttime and due to the great significance of daytime boundary layer detection, all of the PBLH results in this study were estimated from daytime observations.
The estimation method of PBLH was described in Section 3.2.
The PBLH values are relative to surface height, and the difference of PBLH derived from CALIOP and CE370 is 74 m.
Based on the principle mentioned above, a detection method was adopted to estimate the PBLH. Firstly, we searched for the local maximum in the vertical wavelet covariance coefficient starting from the surface.
The KWRF-produced PBLH can be evaluated using remote-sensing equipment such as radiosonde and wind profiler.
To measure the performance of the PBLH produced by the KWRF Model, a point-to-point comparison was conducted at the Osan site where the two types of observation datasets are available.
The model's underestimation of PBL height in the present study is firstly because the sounding data were mainly from clear days, while the modeled PBLH data were from all days.
For simplicity, the diurnal range (daily maximum minus daily minimum) of PBLH is defined by 15LST PBLH minus 03LST PBLH.
Figure 7 shows the morning growth rate of PBLH, which is defined by 12LST PBLH minus 06LST PBLH.