Effects of Shallow Residual Layer on the Development of the Convective Boundary Layer in Naqu Area [那曲地区浅薄残余层对对流边界层发展的影响]

作者：Jing H.; Zhao L.; Meng X.^*; Han B.; Li Z.; Chen H.; Hu Z.; Zhang J.

来源：Plateau Meteorology, 2020, 39(6): 1318-1328.

DOI：10.7522/j.issn.1000-0534.2019.00137

• convective boundary layer
• energy flux
• Residual Layer
• wind shear

In this paper，the atmospheric boundary layer structure of Naqu station on 25 and 26 August 2016 is analyzed by using the radiosonde and other meteorological observation data. The results show that the boundary layer height at 14:00（Beijing Time，after the same）. on August 25 and 26 were 1244 m and 1966 m respectively，while the accumulated surface sensible heat fluxes during 08:00-14:00 were 605 W·m-2 and 650 W·m-2 respectively. In other words，the difference of the height of convective boundary layer in clear sky can reach 60% when the difference of accumulated surface sensible heat fluxes is only 7%. Further analysis shows that the existence of shallow residual layer may be the main reason for the difference of boundary layer development between the two days. The existence of the shallow residual layer potentially contributes the sensible flux heating the atmosphere in the boundary layer. However，the latest reanalysis data from ECMWF，i. e. ，ERA5 could not capture the existence of the shallow residual layer，whilst it could reproduce the vertical distribution characteristics of the potential temperature and wind speed basically.

• 单位
  中国科学院大学