Characteristics and relationships between daily maximum boundary layer height and precipitation in the arid and semi‐arid regions of East Asia

Weather ◽  
2021 ◽  
Author(s):  
Yanling Guo ◽  
Wenyu Zhang ◽  
Lixin Mao ◽  
Kaiqiang Wang
Keyword(s):  
Boundary Layer ◽  
East Asia ◽  
Arid Regions ◽  
Daily Maximum ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Semi Arid

scholarly journals Spatial Characteristics of Deep-Developed Boundary Layers and Numerical Simulation Applicability over Arid and Semi-Arid Regions in Northwest China

Atmosphere ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 195
Author(s):  
Ma ◽  
Tan ◽  
Ding ◽  
Chen ◽  
Yang
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Arid Region ◽  
Arid Regions ◽  
Northwest China ◽  
Late Spring ◽  
Arid Areas ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Semi Arid

The spatial distribution and long-time variation of the deep-developed boundary layer are not well understood in arid and semi-arid regions of northwest China. ERA-Interim (ECMWF Reanalysis data, ECMWF: European Centre for Medium-Range Weather Forecasts) were used to study the deep-developed boundary layer in the five representative areas in summer and then the Weather Research Forecast (WRF) model was applied to simulate and verify its applicability. The results show that the boundary layer heights in the five representative areas are higher in late spring and summer (the highest is 2485~3502 m in June) and lower in autumn, winter and early spring (the lowest is 758~907 m in December). The seasonal variations of the boundary layer height are smaller at 02:00 BJT and 08:00 BJT, while the variations are relatively larger at 14:00 BJT and 20:00 BJT. The atmospheric boundary layer, with heights over 4000 m, generally exists in late spring and summer. The boundary layer heights are higher in the arid region than in the semi-arid region and the deep-developed boundary layer lasts longer in the arid region. The boundary layer heights present reductions from the northwest to the southeast, except for Minqin in the middle north. The numerical simulation results show that there is a significant difference between different combinations of parameterization schemes to simulate the deep-developed boundary layer in these areas. The combination Goddard+SLAB+ACM2 performs better in the extreme arid area, Dunhuang, and the arid areas, Jiuquan and Minqin, whereas the simulation effect of the combination Dudhia+Noah+ACM2 is better in the semi-arid areas, Yuzhong and Lanzhou. The difference between the schemes is related to the determination of the boundary layer height.

scholarly journals Diurnal and seasonal variation of planetary boundary layer height over East Asia and its climatic change as seen in the ERA-5 reanalysis data

2022 ◽  
Vol 4 (2) ◽  
Author(s):  
Kwang-Yul Kim
Keyword(s):  
Boundary Layer ◽  
East Asia ◽  
Sensible Heat Flux ◽  
Reanalysis Data ◽  
Minor Role ◽  
The Tibetan Plateau ◽  
Regional Warming ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Continental Area

AbstractThe diurnal/seasonal structure of the boundary layer height (BLH) is investigated over East Asia by using the hourly synoptic monthly ERA5 reanalysis variables from 1979 to 2019. Sensible heat flux (SHF) is the major factor in the temporal and spatial variation of the BLH. Although BLH, in general, is positively correlated with SHF throughout the year, BLH-SHF relationship varies significantly based on the surface type, latitude and time of the year. Analysis also reveals that stability is an important parameter controlling the diurnal maximum BLH. The growth of BLH is strongly limited by the presence of a stable layer. On the other hand, BLH increases abruptly in the presence of a weakly stratified residual layer. In addition, regional warming tends to increase the BLH in the mid- to high-latitude continental area. In the low-latitude continental area, the sign of anomalous SHF varies seasonally and regionally. Stability plays only a minor role in the BLH change except over the Tibetan Plateau, where the increased stability at the top of boundary layer due to warming reduces BLH rather significantly.

scholarly journals Diurnal and Seasonal Variation of Planetary Boundary Layer Height  over East Asia and Its Climatic Change as Seen in the ERA-5 Reanalysis Data

2021 ◽  
Author(s):  
Kwang-Yul Kim
Keyword(s):  
Boundary Layer ◽  
East Asia ◽  
Sensible Heat Flux ◽  
Reanalysis Data ◽  
Minor Role ◽  
The Tibetan Plateau ◽  
Regional Warming ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Continental Area

Abstract The diurnal/seasonal structure of the boundary layer height (BLH) is investigated over East Asia by using the hourly synoptic monthly ERA5 reanalysis variables from 1979–2019. Sensible heat flux (SHF) is the major factor in the temporal and spatial variation of the BLH. Although BLH, in general, is positively correlated with SHF throughout the year, BLH-SHF relationship varies significantly based on the surface type, latitude and time of the year. Analysis also reveals that stability is an important parameter controlling the diurnal maximum BLH. The growth of BLH is strongly limited by the presence of a stable layer. On the other hand, BLH increases abruptly in the presence of a weakly stratified residual layer. In addition, regional warming tends to increase the BLH in the mid- to high-latitude continental area. In the low-latitude continental area, the sign of SHF differs seasonally and regionally. Stability plays only a minor role in the BLH change except over the Tibetan Plateau, where the increased stability at the top of boundary layer due to warming reduces BLH rather significantly.

scholarly journals Effect of Surface Heterogeneity on the Boundary-Layer Height: A Case Study at a Semi-Arid Forest

2018 ◽  
Vol 169 (2) ◽  
pp. 233-250 ◽  
Author(s):  
Peter Brugger ◽  
Tirtha Banerjee ◽  
Frederik De Roo ◽  
Konstantin Kröniger ◽  
Rafat Qubaja ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Surface Heterogeneity ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Semi Arid ◽  
Effect Of Surface

scholarly journals Technical note: Boundary layer height determination from Lidar for improving air pollution episode modelling: development of new algorithm and evaluation

2017 ◽  
Author(s):  
Ting Yang ◽  
Zifa Wang ◽  
Wei Zhang ◽  
Alex Gbaguidi ◽  
Nubuo Sugimoto ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Air Pollution ◽  
High Performance ◽  
Accurate Determination ◽  
Technical Note ◽  
Strong Increase ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Retrieval Algorithms ◽  
The Impact

Abstract. Predicting air pollution events in low atmosphere over megacities requires thorough understanding of the tropospheric dynamic and chemical processes, involving notably, continuous and accurate determination of the boundary layer height (BLH). Through intensive observations experimented over Beijing (China), and an exhaustive evaluation existing algorithms applied to the BLH determination, persistent critical limitations are noticed, in particular over polluted episodes. Basically, under weak thermal convection with high aerosol loading, none of the retrieval algorithms is able to fully capture the diurnal cycle of the BLH due to pollutant insufficient vertical mixing in the boundary layer associated with the impact of gravity waves on the tropospheric structure. Subsequently, a new approach based on gravity wave theory (the cubic root gradient method: CRGM), is developed to overcome such weakness and accurately reproduce the fluctuations of the BLH under various atmospheric pollution conditions. Comprehensive evaluation of CRGM highlights its high performance in determining BLH from Lidar. In comparison with the existing retrieval algorithms, the CRGM potentially reduces related computational uncertainties and errors from BLH determination (strong increase of correlation coefficient from 0.44 to 0.91 and significant decrease of the root mean square error from 643 m to 142 m). Such newly developed technique is undoubtedly expected to contribute to improve the accuracy of air quality modelling and forecasting systems.

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